2856089e36
Rename detection is added to the "ORT" merge strategy. * en/merge-ort-3: merge-ort: add implementation of type-changed rename handling merge-ort: add implementation of normal rename handling merge-ort: add implementation of rename collisions merge-ort: add implementation of rename/delete conflicts merge-ort: add implementation of both sides renaming differently merge-ort: add implementation of both sides renaming identically merge-ort: add basic outline for process_renames() merge-ort: implement compare_pairs() and collect_renames() merge-ort: implement detect_regular_renames() merge-ort: add initial outline for basic rename detection merge-ort: add basic data structures for handling renames
1988 lines
64 KiB
C
1988 lines
64 KiB
C
/*
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* "Ostensibly Recursive's Twin" merge strategy, or "ort" for short. Meant
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* as a drop-in replacement for the "recursive" merge strategy, allowing one
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* to replace
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*
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* git merge [-s recursive]
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*
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* with
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*
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* git merge -s ort
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*
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* Note: git's parser allows the space between '-s' and its argument to be
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* missing. (Should I have backronymed "ham", "alsa", "kip", "nap, "alvo",
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* "cale", "peedy", or "ins" instead of "ort"?)
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*/
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#include "cache.h"
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#include "merge-ort.h"
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#include "alloc.h"
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#include "blob.h"
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#include "cache-tree.h"
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#include "commit.h"
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#include "commit-reach.h"
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#include "diff.h"
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#include "diffcore.h"
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#include "dir.h"
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#include "object-store.h"
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#include "strmap.h"
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#include "tree.h"
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#include "unpack-trees.h"
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#include "xdiff-interface.h"
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/*
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* We have many arrays of size 3. Whenever we have such an array, the
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* indices refer to one of the sides of the three-way merge. This is so
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* pervasive that the constants 0, 1, and 2 are used in many places in the
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* code (especially in arithmetic operations to find the other side's index
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* or to compute a relevant mask), but sometimes these enum names are used
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* to aid code clarity.
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*
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* See also 'filemask' and 'dirmask' in struct conflict_info; the "ith side"
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* referred to there is one of these three sides.
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*/
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enum merge_side {
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MERGE_BASE = 0,
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MERGE_SIDE1 = 1,
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MERGE_SIDE2 = 2
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};
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struct rename_info {
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/*
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* pairs: pairing of filenames from diffcore_rename()
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*
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* Index 1 and 2 correspond to sides 1 & 2 as used in
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* conflict_info.stages. Index 0 unused.
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*/
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struct diff_queue_struct pairs[3];
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/*
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* needed_limit: value needed for inexact rename detection to run
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*
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* If the current rename limit wasn't high enough for inexact
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* rename detection to run, this records the limit needed. Otherwise,
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* this value remains 0.
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*/
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int needed_limit;
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};
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struct merge_options_internal {
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/*
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* paths: primary data structure in all of merge ort.
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*
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* The keys of paths:
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* * are full relative paths from the toplevel of the repository
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* (e.g. "drivers/firmware/raspberrypi.c").
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* * store all relevant paths in the repo, both directories and
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* files (e.g. drivers, drivers/firmware would also be included)
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* * these keys serve to intern all the path strings, which allows
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* us to do pointer comparison on directory names instead of
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* strcmp; we just have to be careful to use the interned strings.
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* (Technically paths_to_free may track some strings that were
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* removed from froms paths.)
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*
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* The values of paths:
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* * either a pointer to a merged_info, or a conflict_info struct
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* * merged_info contains all relevant information for a
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* non-conflicted entry.
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* * conflict_info contains a merged_info, plus any additional
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* information about a conflict such as the higher orders stages
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* involved and the names of the paths those came from (handy
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* once renames get involved).
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* * a path may start "conflicted" (i.e. point to a conflict_info)
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* and then a later step (e.g. three-way content merge) determines
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* it can be cleanly merged, at which point it'll be marked clean
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* and the algorithm will ignore any data outside the contained
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* merged_info for that entry
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* * If an entry remains conflicted, the merged_info portion of a
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* conflict_info will later be filled with whatever version of
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* the file should be placed in the working directory (e.g. an
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* as-merged-as-possible variation that contains conflict markers).
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*/
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struct strmap paths;
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/*
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* conflicted: a subset of keys->values from "paths"
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*
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* conflicted is basically an optimization between process_entries()
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* and record_conflicted_index_entries(); the latter could loop over
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* ALL the entries in paths AGAIN and look for the ones that are
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* still conflicted, but since process_entries() has to loop over
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* all of them, it saves the ones it couldn't resolve in this strmap
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* so that record_conflicted_index_entries() can iterate just the
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* relevant entries.
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*/
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struct strmap conflicted;
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/*
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* paths_to_free: additional list of strings to free
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*
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* If keys are removed from "paths", they are added to paths_to_free
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* to ensure they are later freed. We avoid free'ing immediately since
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* other places (e.g. conflict_info.pathnames[]) may still be
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* referencing these paths.
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*/
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struct string_list paths_to_free;
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/*
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* output: special messages and conflict notices for various paths
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*
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* This is a map of pathnames (a subset of the keys in "paths" above)
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* to strbufs. It gathers various warning/conflict/notice messages
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* for later processing.
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*/
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struct strmap output;
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/*
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* renames: various data relating to rename detection
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*/
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struct rename_info renames;
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/*
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* current_dir_name: temporary var used in collect_merge_info_callback()
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*
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* Used to set merged_info.directory_name; see documentation for that
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* variable and the requirements placed on that field.
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*/
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const char *current_dir_name;
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/* call_depth: recursion level counter for merging merge bases */
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int call_depth;
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};
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struct version_info {
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struct object_id oid;
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unsigned short mode;
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};
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struct merged_info {
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/* if is_null, ignore result. otherwise result has oid & mode */
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struct version_info result;
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unsigned is_null:1;
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/*
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* clean: whether the path in question is cleanly merged.
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*
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* see conflict_info.merged for more details.
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*/
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unsigned clean:1;
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/*
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* basename_offset: offset of basename of path.
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*
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* perf optimization to avoid recomputing offset of final '/'
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* character in pathname (0 if no '/' in pathname).
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*/
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size_t basename_offset;
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/*
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* directory_name: containing directory name.
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*
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* Note that we assume directory_name is constructed such that
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* strcmp(dir1_name, dir2_name) == 0 iff dir1_name == dir2_name,
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* i.e. string equality is equivalent to pointer equality. For this
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* to hold, we have to be careful setting directory_name.
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*/
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const char *directory_name;
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};
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struct conflict_info {
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/*
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* merged: the version of the path that will be written to working tree
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*
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* WARNING: It is critical to check merged.clean and ensure it is 0
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* before reading any conflict_info fields outside of merged.
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* Allocated merge_info structs will always have clean set to 1.
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* Allocated conflict_info structs will have merged.clean set to 0
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* initially. The merged.clean field is how we know if it is safe
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* to access other parts of conflict_info besides merged; if a
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* conflict_info's merged.clean is changed to 1, the rest of the
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* algorithm is not allowed to look at anything outside of the
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* merged member anymore.
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*/
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struct merged_info merged;
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/* oids & modes from each of the three trees for this path */
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struct version_info stages[3];
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/* pathnames for each stage; may differ due to rename detection */
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const char *pathnames[3];
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/* Whether this path is/was involved in a directory/file conflict */
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unsigned df_conflict:1;
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/*
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* Whether this path is/was involved in a non-content conflict other
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* than a directory/file conflict (e.g. rename/rename, rename/delete,
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* file location based on possible directory rename).
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*/
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unsigned path_conflict:1;
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/*
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* For filemask and dirmask, the ith bit corresponds to whether the
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* ith entry is a file (filemask) or a directory (dirmask). Thus,
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* filemask & dirmask is always zero, and filemask | dirmask is at
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* most 7 but can be less when a path does not appear as either a
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* file or a directory on at least one side of history.
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*
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* Note that these masks are related to enum merge_side, as the ith
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* entry corresponds to side i.
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*
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* These values come from a traverse_trees() call; more info may be
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* found looking at tree-walk.h's struct traverse_info,
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* particularly the documentation above the "fn" member (note that
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* filemask = mask & ~dirmask from that documentation).
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*/
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unsigned filemask:3;
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unsigned dirmask:3;
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/*
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* Optimization to track which stages match, to avoid the need to
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* recompute it in multiple steps. Either 0 or at least 2 bits are
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* set; if at least 2 bits are set, their corresponding stages match.
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*/
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unsigned match_mask:3;
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};
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/*** Function Grouping: various utility functions ***/
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/*
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* For the next three macros, see warning for conflict_info.merged.
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*
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* In each of the below, mi is a struct merged_info*, and ci was defined
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* as a struct conflict_info* (but we need to verify ci isn't actually
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* pointed at a struct merged_info*).
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*
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* INITIALIZE_CI: Assign ci to mi but only if it's safe; set to NULL otherwise.
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* VERIFY_CI: Ensure that something we assigned to a conflict_info* is one.
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* ASSIGN_AND_VERIFY_CI: Similar to VERIFY_CI but do assignment first.
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*/
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#define INITIALIZE_CI(ci, mi) do { \
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(ci) = (!(mi) || (mi)->clean) ? NULL : (struct conflict_info *)(mi); \
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} while (0)
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#define VERIFY_CI(ci) assert(ci && !ci->merged.clean);
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#define ASSIGN_AND_VERIFY_CI(ci, mi) do { \
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(ci) = (struct conflict_info *)(mi); \
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assert((ci) && !(mi)->clean); \
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} while (0)
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static void free_strmap_strings(struct strmap *map)
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{
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struct hashmap_iter iter;
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struct strmap_entry *entry;
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strmap_for_each_entry(map, &iter, entry) {
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free((char*)entry->key);
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}
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}
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static void clear_or_reinit_internal_opts(struct merge_options_internal *opti,
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int reinitialize)
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{
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void (*strmap_func)(struct strmap *, int) =
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reinitialize ? strmap_partial_clear : strmap_clear;
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/*
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* We marked opti->paths with strdup_strings = 0, so that we
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* wouldn't have to make another copy of the fullpath created by
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* make_traverse_path from setup_path_info(). But, now that we've
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* used it and have no other references to these strings, it is time
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* to deallocate them.
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*/
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free_strmap_strings(&opti->paths);
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strmap_func(&opti->paths, 1);
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/*
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* All keys and values in opti->conflicted are a subset of those in
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* opti->paths. We don't want to deallocate anything twice, so we
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* don't free the keys and we pass 0 for free_values.
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*/
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strmap_func(&opti->conflicted, 0);
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/*
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* opti->paths_to_free is similar to opti->paths; we created it with
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* strdup_strings = 0 to avoid making _another_ copy of the fullpath
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* but now that we've used it and have no other references to these
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* strings, it is time to deallocate them. We do so by temporarily
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* setting strdup_strings to 1.
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*/
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opti->paths_to_free.strdup_strings = 1;
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string_list_clear(&opti->paths_to_free, 0);
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opti->paths_to_free.strdup_strings = 0;
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if (!reinitialize) {
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struct hashmap_iter iter;
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struct strmap_entry *e;
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/* Release and free each strbuf found in output */
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strmap_for_each_entry(&opti->output, &iter, e) {
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struct strbuf *sb = e->value;
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strbuf_release(sb);
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/*
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* While strictly speaking we don't need to free(sb)
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* here because we could pass free_values=1 when
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* calling strmap_clear() on opti->output, that would
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* require strmap_clear to do another
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* strmap_for_each_entry() loop, so we just free it
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* while we're iterating anyway.
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*/
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free(sb);
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}
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strmap_clear(&opti->output, 0);
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}
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}
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static int err(struct merge_options *opt, const char *err, ...)
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{
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va_list params;
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struct strbuf sb = STRBUF_INIT;
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strbuf_addstr(&sb, "error: ");
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va_start(params, err);
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strbuf_vaddf(&sb, err, params);
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va_end(params);
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error("%s", sb.buf);
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strbuf_release(&sb);
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return -1;
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}
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__attribute__((format (printf, 4, 5)))
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static void path_msg(struct merge_options *opt,
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const char *path,
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int omittable_hint, /* skippable under --remerge-diff */
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const char *fmt, ...)
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{
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va_list ap;
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struct strbuf *sb = strmap_get(&opt->priv->output, path);
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if (!sb) {
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sb = xmalloc(sizeof(*sb));
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strbuf_init(sb, 0);
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strmap_put(&opt->priv->output, path, sb);
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}
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va_start(ap, fmt);
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strbuf_vaddf(sb, fmt, ap);
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va_end(ap);
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strbuf_addch(sb, '\n');
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}
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/*** Function Grouping: functions related to collect_merge_info() ***/
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static void setup_path_info(struct merge_options *opt,
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struct string_list_item *result,
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const char *current_dir_name,
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int current_dir_name_len,
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char *fullpath, /* we'll take over ownership */
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struct name_entry *names,
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struct name_entry *merged_version,
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unsigned is_null, /* boolean */
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unsigned df_conflict, /* boolean */
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unsigned filemask,
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unsigned dirmask,
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int resolved /* boolean */)
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{
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/* result->util is void*, so mi is a convenience typed variable */
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struct merged_info *mi;
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assert(!is_null || resolved);
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assert(!df_conflict || !resolved); /* df_conflict implies !resolved */
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assert(resolved == (merged_version != NULL));
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mi = xcalloc(1, resolved ? sizeof(struct merged_info) :
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sizeof(struct conflict_info));
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mi->directory_name = current_dir_name;
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mi->basename_offset = current_dir_name_len;
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mi->clean = !!resolved;
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if (resolved) {
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mi->result.mode = merged_version->mode;
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oidcpy(&mi->result.oid, &merged_version->oid);
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mi->is_null = !!is_null;
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} else {
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int i;
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struct conflict_info *ci;
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ASSIGN_AND_VERIFY_CI(ci, mi);
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for (i = MERGE_BASE; i <= MERGE_SIDE2; i++) {
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ci->pathnames[i] = fullpath;
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ci->stages[i].mode = names[i].mode;
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oidcpy(&ci->stages[i].oid, &names[i].oid);
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}
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ci->filemask = filemask;
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ci->dirmask = dirmask;
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ci->df_conflict = !!df_conflict;
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if (dirmask)
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/*
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* Assume is_null for now, but if we have entries
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* under the directory then when it is complete in
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* write_completed_directory() it'll update this.
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* Also, for D/F conflicts, we have to handle the
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* directory first, then clear this bit and process
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* the file to see how it is handled -- that occurs
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* near the top of process_entry().
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*/
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mi->is_null = 1;
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}
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strmap_put(&opt->priv->paths, fullpath, mi);
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result->string = fullpath;
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result->util = mi;
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}
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static int collect_merge_info_callback(int n,
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unsigned long mask,
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unsigned long dirmask,
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struct name_entry *names,
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struct traverse_info *info)
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{
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/*
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* n is 3. Always.
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* common ancestor (mbase) has mask 1, and stored in index 0 of names
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* head of side 1 (side1) has mask 2, and stored in index 1 of names
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* head of side 2 (side2) has mask 4, and stored in index 2 of names
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*/
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struct merge_options *opt = info->data;
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struct merge_options_internal *opti = opt->priv;
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struct string_list_item pi; /* Path Info */
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struct conflict_info *ci; /* typed alias to pi.util (which is void*) */
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struct name_entry *p;
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size_t len;
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char *fullpath;
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const char *dirname = opti->current_dir_name;
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unsigned filemask = mask & ~dirmask;
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unsigned match_mask = 0; /* will be updated below */
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unsigned mbase_null = !(mask & 1);
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unsigned side1_null = !(mask & 2);
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unsigned side2_null = !(mask & 4);
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unsigned side1_matches_mbase = (!side1_null && !mbase_null &&
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names[0].mode == names[1].mode &&
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oideq(&names[0].oid, &names[1].oid));
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unsigned side2_matches_mbase = (!side2_null && !mbase_null &&
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names[0].mode == names[2].mode &&
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oideq(&names[0].oid, &names[2].oid));
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unsigned sides_match = (!side1_null && !side2_null &&
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names[1].mode == names[2].mode &&
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oideq(&names[1].oid, &names[2].oid));
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/*
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* Note: When a path is a file on one side of history and a directory
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* in another, we have a directory/file conflict. In such cases, if
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* the conflict doesn't resolve from renames and deletions, then we
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* always leave directories where they are and move files out of the
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* way. Thus, while struct conflict_info has a df_conflict field to
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* track such conflicts, we ignore that field for any directories at
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* a path and only pay attention to it for files at the given path.
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* The fact that we leave directories were they are also means that
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* we do not need to worry about getting additional df_conflict
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* information propagated from parent directories down to children
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* (unlike, say traverse_trees_recursive() in unpack-trees.c, which
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* sets a newinfo.df_conflicts field specifically to propagate it).
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*/
|
|
unsigned df_conflict = (filemask != 0) && (dirmask != 0);
|
|
|
|
/* n = 3 is a fundamental assumption. */
|
|
if (n != 3)
|
|
BUG("Called collect_merge_info_callback wrong");
|
|
|
|
/*
|
|
* A bunch of sanity checks verifying that traverse_trees() calls
|
|
* us the way I expect. Could just remove these at some point,
|
|
* though maybe they are helpful to future code readers.
|
|
*/
|
|
assert(mbase_null == is_null_oid(&names[0].oid));
|
|
assert(side1_null == is_null_oid(&names[1].oid));
|
|
assert(side2_null == is_null_oid(&names[2].oid));
|
|
assert(!mbase_null || !side1_null || !side2_null);
|
|
assert(mask > 0 && mask < 8);
|
|
|
|
/* Determine match_mask */
|
|
if (side1_matches_mbase)
|
|
match_mask = (side2_matches_mbase ? 7 : 3);
|
|
else if (side2_matches_mbase)
|
|
match_mask = 5;
|
|
else if (sides_match)
|
|
match_mask = 6;
|
|
|
|
/*
|
|
* Get the name of the relevant filepath, which we'll pass to
|
|
* setup_path_info() for tracking.
|
|
*/
|
|
p = names;
|
|
while (!p->mode)
|
|
p++;
|
|
len = traverse_path_len(info, p->pathlen);
|
|
|
|
/* +1 in both of the following lines to include the NUL byte */
|
|
fullpath = xmalloc(len + 1);
|
|
make_traverse_path(fullpath, len + 1, info, p->path, p->pathlen);
|
|
|
|
/*
|
|
* If mbase, side1, and side2 all match, we can resolve early. Even
|
|
* if these are trees, there will be no renames or anything
|
|
* underneath.
|
|
*/
|
|
if (side1_matches_mbase && side2_matches_mbase) {
|
|
/* mbase, side1, & side2 all match; use mbase as resolution */
|
|
setup_path_info(opt, &pi, dirname, info->pathlen, fullpath,
|
|
names, names+0, mbase_null, 0,
|
|
filemask, dirmask, 1);
|
|
return mask;
|
|
}
|
|
|
|
/*
|
|
* Record information about the path so we can resolve later in
|
|
* process_entries.
|
|
*/
|
|
setup_path_info(opt, &pi, dirname, info->pathlen, fullpath,
|
|
names, NULL, 0, df_conflict, filemask, dirmask, 0);
|
|
|
|
ci = pi.util;
|
|
VERIFY_CI(ci);
|
|
ci->match_mask = match_mask;
|
|
|
|
/* If dirmask, recurse into subdirectories */
|
|
if (dirmask) {
|
|
struct traverse_info newinfo;
|
|
struct tree_desc t[3];
|
|
void *buf[3] = {NULL, NULL, NULL};
|
|
const char *original_dir_name;
|
|
int i, ret;
|
|
|
|
ci->match_mask &= filemask;
|
|
newinfo = *info;
|
|
newinfo.prev = info;
|
|
newinfo.name = p->path;
|
|
newinfo.namelen = p->pathlen;
|
|
newinfo.pathlen = st_add3(newinfo.pathlen, p->pathlen, 1);
|
|
/*
|
|
* If this directory we are about to recurse into cared about
|
|
* its parent directory (the current directory) having a D/F
|
|
* conflict, then we'd propagate the masks in this way:
|
|
* newinfo.df_conflicts |= (mask & ~dirmask);
|
|
* But we don't worry about propagating D/F conflicts. (See
|
|
* comment near setting of local df_conflict variable near
|
|
* the beginning of this function).
|
|
*/
|
|
|
|
for (i = MERGE_BASE; i <= MERGE_SIDE2; i++) {
|
|
if (i == 1 && side1_matches_mbase)
|
|
t[1] = t[0];
|
|
else if (i == 2 && side2_matches_mbase)
|
|
t[2] = t[0];
|
|
else if (i == 2 && sides_match)
|
|
t[2] = t[1];
|
|
else {
|
|
const struct object_id *oid = NULL;
|
|
if (dirmask & 1)
|
|
oid = &names[i].oid;
|
|
buf[i] = fill_tree_descriptor(opt->repo,
|
|
t + i, oid);
|
|
}
|
|
dirmask >>= 1;
|
|
}
|
|
|
|
original_dir_name = opti->current_dir_name;
|
|
opti->current_dir_name = pi.string;
|
|
ret = traverse_trees(NULL, 3, t, &newinfo);
|
|
opti->current_dir_name = original_dir_name;
|
|
|
|
for (i = MERGE_BASE; i <= MERGE_SIDE2; i++)
|
|
free(buf[i]);
|
|
|
|
if (ret < 0)
|
|
return -1;
|
|
}
|
|
|
|
return mask;
|
|
}
|
|
|
|
static int collect_merge_info(struct merge_options *opt,
|
|
struct tree *merge_base,
|
|
struct tree *side1,
|
|
struct tree *side2)
|
|
{
|
|
int ret;
|
|
struct tree_desc t[3];
|
|
struct traverse_info info;
|
|
const char *toplevel_dir_placeholder = "";
|
|
|
|
opt->priv->current_dir_name = toplevel_dir_placeholder;
|
|
setup_traverse_info(&info, toplevel_dir_placeholder);
|
|
info.fn = collect_merge_info_callback;
|
|
info.data = opt;
|
|
info.show_all_errors = 1;
|
|
|
|
parse_tree(merge_base);
|
|
parse_tree(side1);
|
|
parse_tree(side2);
|
|
init_tree_desc(t + 0, merge_base->buffer, merge_base->size);
|
|
init_tree_desc(t + 1, side1->buffer, side1->size);
|
|
init_tree_desc(t + 2, side2->buffer, side2->size);
|
|
|
|
ret = traverse_trees(NULL, 3, t, &info);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*** Function Grouping: functions related to threeway content merges ***/
|
|
|
|
static int handle_content_merge(struct merge_options *opt,
|
|
const char *path,
|
|
const struct version_info *o,
|
|
const struct version_info *a,
|
|
const struct version_info *b,
|
|
const char *pathnames[3],
|
|
const int extra_marker_size,
|
|
struct version_info *result)
|
|
{
|
|
die("Not yet implemented");
|
|
}
|
|
|
|
/*** Function Grouping: functions related to detect_and_process_renames(), ***
|
|
*** which are split into directory and regular rename detection sections. ***/
|
|
|
|
/*** Function Grouping: functions related to directory rename detection ***/
|
|
|
|
/*** Function Grouping: functions related to regular rename detection ***/
|
|
|
|
static int process_renames(struct merge_options *opt,
|
|
struct diff_queue_struct *renames)
|
|
{
|
|
int clean_merge = 1, i;
|
|
|
|
for (i = 0; i < renames->nr; ++i) {
|
|
const char *oldpath = NULL, *newpath;
|
|
struct diff_filepair *pair = renames->queue[i];
|
|
struct conflict_info *oldinfo = NULL, *newinfo = NULL;
|
|
struct strmap_entry *old_ent, *new_ent;
|
|
unsigned int old_sidemask;
|
|
int target_index, other_source_index;
|
|
int source_deleted, collision, type_changed;
|
|
const char *rename_branch = NULL, *delete_branch = NULL;
|
|
|
|
old_ent = strmap_get_entry(&opt->priv->paths, pair->one->path);
|
|
oldpath = old_ent->key;
|
|
oldinfo = old_ent->value;
|
|
|
|
new_ent = strmap_get_entry(&opt->priv->paths, pair->two->path);
|
|
newpath = new_ent->key;
|
|
newinfo = new_ent->value;
|
|
|
|
/*
|
|
* diff_filepairs have copies of pathnames, thus we have to
|
|
* use standard 'strcmp()' (negated) instead of '=='.
|
|
*/
|
|
if (i + 1 < renames->nr &&
|
|
!strcmp(oldpath, renames->queue[i+1]->one->path)) {
|
|
/* Handle rename/rename(1to2) or rename/rename(1to1) */
|
|
const char *pathnames[3];
|
|
struct version_info merged;
|
|
struct conflict_info *base, *side1, *side2;
|
|
unsigned was_binary_blob = 0;
|
|
|
|
pathnames[0] = oldpath;
|
|
pathnames[1] = newpath;
|
|
pathnames[2] = renames->queue[i+1]->two->path;
|
|
|
|
base = strmap_get(&opt->priv->paths, pathnames[0]);
|
|
side1 = strmap_get(&opt->priv->paths, pathnames[1]);
|
|
side2 = strmap_get(&opt->priv->paths, pathnames[2]);
|
|
|
|
VERIFY_CI(base);
|
|
VERIFY_CI(side1);
|
|
VERIFY_CI(side2);
|
|
|
|
if (!strcmp(pathnames[1], pathnames[2])) {
|
|
/* Both sides renamed the same way */
|
|
assert(side1 == side2);
|
|
memcpy(&side1->stages[0], &base->stages[0],
|
|
sizeof(merged));
|
|
side1->filemask |= (1 << MERGE_BASE);
|
|
/* Mark base as resolved by removal */
|
|
base->merged.is_null = 1;
|
|
base->merged.clean = 1;
|
|
|
|
/* We handled both renames, i.e. i+1 handled */
|
|
i++;
|
|
/* Move to next rename */
|
|
continue;
|
|
}
|
|
|
|
/* This is a rename/rename(1to2) */
|
|
clean_merge = handle_content_merge(opt,
|
|
pair->one->path,
|
|
&base->stages[0],
|
|
&side1->stages[1],
|
|
&side2->stages[2],
|
|
pathnames,
|
|
1 + 2 * opt->priv->call_depth,
|
|
&merged);
|
|
if (!clean_merge &&
|
|
merged.mode == side1->stages[1].mode &&
|
|
oideq(&merged.oid, &side1->stages[1].oid))
|
|
was_binary_blob = 1;
|
|
memcpy(&side1->stages[1], &merged, sizeof(merged));
|
|
if (was_binary_blob) {
|
|
/*
|
|
* Getting here means we were attempting to
|
|
* merge a binary blob.
|
|
*
|
|
* Since we can't merge binaries,
|
|
* handle_content_merge() just takes one
|
|
* side. But we don't want to copy the
|
|
* contents of one side to both paths. We
|
|
* used the contents of side1 above for
|
|
* side1->stages, let's use the contents of
|
|
* side2 for side2->stages below.
|
|
*/
|
|
oidcpy(&merged.oid, &side2->stages[2].oid);
|
|
merged.mode = side2->stages[2].mode;
|
|
}
|
|
memcpy(&side2->stages[2], &merged, sizeof(merged));
|
|
|
|
side1->path_conflict = 1;
|
|
side2->path_conflict = 1;
|
|
/*
|
|
* TODO: For renames we normally remove the path at the
|
|
* old name. It would thus seem consistent to do the
|
|
* same for rename/rename(1to2) cases, but we haven't
|
|
* done so traditionally and a number of the regression
|
|
* tests now encode an expectation that the file is
|
|
* left there at stage 1. If we ever decide to change
|
|
* this, add the following two lines here:
|
|
* base->merged.is_null = 1;
|
|
* base->merged.clean = 1;
|
|
* and remove the setting of base->path_conflict to 1.
|
|
*/
|
|
base->path_conflict = 1;
|
|
path_msg(opt, oldpath, 0,
|
|
_("CONFLICT (rename/rename): %s renamed to "
|
|
"%s in %s and to %s in %s."),
|
|
pathnames[0],
|
|
pathnames[1], opt->branch1,
|
|
pathnames[2], opt->branch2);
|
|
|
|
i++; /* We handled both renames, i.e. i+1 handled */
|
|
continue;
|
|
}
|
|
|
|
VERIFY_CI(oldinfo);
|
|
VERIFY_CI(newinfo);
|
|
target_index = pair->score; /* from collect_renames() */
|
|
assert(target_index == 1 || target_index == 2);
|
|
other_source_index = 3 - target_index;
|
|
old_sidemask = (1 << other_source_index); /* 2 or 4 */
|
|
source_deleted = (oldinfo->filemask == 1);
|
|
collision = ((newinfo->filemask & old_sidemask) != 0);
|
|
type_changed = !source_deleted &&
|
|
(S_ISREG(oldinfo->stages[other_source_index].mode) !=
|
|
S_ISREG(newinfo->stages[target_index].mode));
|
|
if (type_changed && collision) {
|
|
/*
|
|
* special handling so later blocks can handle this...
|
|
*
|
|
* if type_changed && collision are both true, then this
|
|
* was really a double rename, but one side wasn't
|
|
* detected due to lack of break detection. I.e.
|
|
* something like
|
|
* orig: has normal file 'foo'
|
|
* side1: renames 'foo' to 'bar', adds 'foo' symlink
|
|
* side2: renames 'foo' to 'bar'
|
|
* In this case, the foo->bar rename on side1 won't be
|
|
* detected because the new symlink named 'foo' is
|
|
* there and we don't do break detection. But we detect
|
|
* this here because we don't want to merge the content
|
|
* of the foo symlink with the foo->bar file, so we
|
|
* have some logic to handle this special case. The
|
|
* easiest way to do that is make 'bar' on side1 not
|
|
* be considered a colliding file but the other part
|
|
* of a normal rename. If the file is very different,
|
|
* well we're going to get content merge conflicts
|
|
* anyway so it doesn't hurt. And if the colliding
|
|
* file also has a different type, that'll be handled
|
|
* by the content merge logic in process_entry() too.
|
|
*
|
|
* See also t6430, 'rename vs. rename/symlink'
|
|
*/
|
|
collision = 0;
|
|
}
|
|
if (source_deleted) {
|
|
if (target_index == 1) {
|
|
rename_branch = opt->branch1;
|
|
delete_branch = opt->branch2;
|
|
} else {
|
|
rename_branch = opt->branch2;
|
|
delete_branch = opt->branch1;
|
|
}
|
|
}
|
|
|
|
assert(source_deleted || oldinfo->filemask & old_sidemask);
|
|
|
|
/* Need to check for special types of rename conflicts... */
|
|
if (collision && !source_deleted) {
|
|
/* collision: rename/add or rename/rename(2to1) */
|
|
const char *pathnames[3];
|
|
struct version_info merged;
|
|
|
|
struct conflict_info *base, *side1, *side2;
|
|
unsigned clean;
|
|
|
|
pathnames[0] = oldpath;
|
|
pathnames[other_source_index] = oldpath;
|
|
pathnames[target_index] = newpath;
|
|
|
|
base = strmap_get(&opt->priv->paths, pathnames[0]);
|
|
side1 = strmap_get(&opt->priv->paths, pathnames[1]);
|
|
side2 = strmap_get(&opt->priv->paths, pathnames[2]);
|
|
|
|
VERIFY_CI(base);
|
|
VERIFY_CI(side1);
|
|
VERIFY_CI(side2);
|
|
|
|
clean = handle_content_merge(opt, pair->one->path,
|
|
&base->stages[0],
|
|
&side1->stages[1],
|
|
&side2->stages[2],
|
|
pathnames,
|
|
1 + 2 * opt->priv->call_depth,
|
|
&merged);
|
|
|
|
memcpy(&newinfo->stages[target_index], &merged,
|
|
sizeof(merged));
|
|
if (!clean) {
|
|
path_msg(opt, newpath, 0,
|
|
_("CONFLICT (rename involved in "
|
|
"collision): rename of %s -> %s has "
|
|
"content conflicts AND collides "
|
|
"with another path; this may result "
|
|
"in nested conflict markers."),
|
|
oldpath, newpath);
|
|
}
|
|
} else if (collision && source_deleted) {
|
|
/*
|
|
* rename/add/delete or rename/rename(2to1)/delete:
|
|
* since oldpath was deleted on the side that didn't
|
|
* do the rename, there's not much of a content merge
|
|
* we can do for the rename. oldinfo->merged.is_null
|
|
* was already set, so we just leave things as-is so
|
|
* they look like an add/add conflict.
|
|
*/
|
|
|
|
newinfo->path_conflict = 1;
|
|
path_msg(opt, newpath, 0,
|
|
_("CONFLICT (rename/delete): %s renamed "
|
|
"to %s in %s, but deleted in %s."),
|
|
oldpath, newpath, rename_branch, delete_branch);
|
|
} else {
|
|
/*
|
|
* a few different cases...start by copying the
|
|
* existing stage(s) from oldinfo over the newinfo
|
|
* and update the pathname(s).
|
|
*/
|
|
memcpy(&newinfo->stages[0], &oldinfo->stages[0],
|
|
sizeof(newinfo->stages[0]));
|
|
newinfo->filemask |= (1 << MERGE_BASE);
|
|
newinfo->pathnames[0] = oldpath;
|
|
if (type_changed) {
|
|
/* rename vs. typechange */
|
|
/* Mark the original as resolved by removal */
|
|
memcpy(&oldinfo->stages[0].oid, &null_oid,
|
|
sizeof(oldinfo->stages[0].oid));
|
|
oldinfo->stages[0].mode = 0;
|
|
oldinfo->filemask &= 0x06;
|
|
} else if (source_deleted) {
|
|
/* rename/delete */
|
|
newinfo->path_conflict = 1;
|
|
path_msg(opt, newpath, 0,
|
|
_("CONFLICT (rename/delete): %s renamed"
|
|
" to %s in %s, but deleted in %s."),
|
|
oldpath, newpath,
|
|
rename_branch, delete_branch);
|
|
} else {
|
|
/* normal rename */
|
|
memcpy(&newinfo->stages[other_source_index],
|
|
&oldinfo->stages[other_source_index],
|
|
sizeof(newinfo->stages[0]));
|
|
newinfo->filemask |= (1 << other_source_index);
|
|
newinfo->pathnames[other_source_index] = oldpath;
|
|
}
|
|
}
|
|
|
|
if (!type_changed) {
|
|
/* Mark the original as resolved by removal */
|
|
oldinfo->merged.is_null = 1;
|
|
oldinfo->merged.clean = 1;
|
|
}
|
|
|
|
}
|
|
|
|
return clean_merge;
|
|
}
|
|
|
|
static int compare_pairs(const void *a_, const void *b_)
|
|
{
|
|
const struct diff_filepair *a = *((const struct diff_filepair **)a_);
|
|
const struct diff_filepair *b = *((const struct diff_filepair **)b_);
|
|
|
|
return strcmp(a->one->path, b->one->path);
|
|
}
|
|
|
|
/* Call diffcore_rename() to compute which files have changed on given side */
|
|
static void detect_regular_renames(struct merge_options *opt,
|
|
struct tree *merge_base,
|
|
struct tree *side,
|
|
unsigned side_index)
|
|
{
|
|
struct diff_options diff_opts;
|
|
struct rename_info *renames = &opt->priv->renames;
|
|
|
|
repo_diff_setup(opt->repo, &diff_opts);
|
|
diff_opts.flags.recursive = 1;
|
|
diff_opts.flags.rename_empty = 0;
|
|
diff_opts.detect_rename = DIFF_DETECT_RENAME;
|
|
diff_opts.rename_limit = opt->rename_limit;
|
|
if (opt->rename_limit <= 0)
|
|
diff_opts.rename_limit = 1000;
|
|
diff_opts.rename_score = opt->rename_score;
|
|
diff_opts.show_rename_progress = opt->show_rename_progress;
|
|
diff_opts.output_format = DIFF_FORMAT_NO_OUTPUT;
|
|
diff_setup_done(&diff_opts);
|
|
diff_tree_oid(&merge_base->object.oid, &side->object.oid, "",
|
|
&diff_opts);
|
|
diffcore_std(&diff_opts);
|
|
|
|
if (diff_opts.needed_rename_limit > renames->needed_limit)
|
|
renames->needed_limit = diff_opts.needed_rename_limit;
|
|
|
|
renames->pairs[side_index] = diff_queued_diff;
|
|
|
|
diff_opts.output_format = DIFF_FORMAT_NO_OUTPUT;
|
|
diff_queued_diff.nr = 0;
|
|
diff_queued_diff.queue = NULL;
|
|
diff_flush(&diff_opts);
|
|
}
|
|
|
|
/*
|
|
* Get information of all renames which occurred in 'side_pairs', discarding
|
|
* non-renames.
|
|
*/
|
|
static int collect_renames(struct merge_options *opt,
|
|
struct diff_queue_struct *result,
|
|
unsigned side_index)
|
|
{
|
|
int i, clean = 1;
|
|
struct diff_queue_struct *side_pairs;
|
|
struct rename_info *renames = &opt->priv->renames;
|
|
|
|
side_pairs = &renames->pairs[side_index];
|
|
|
|
for (i = 0; i < side_pairs->nr; ++i) {
|
|
struct diff_filepair *p = side_pairs->queue[i];
|
|
|
|
if (p->status != 'R') {
|
|
diff_free_filepair(p);
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* p->score comes back from diffcore_rename_extended() with
|
|
* the similarity of the renamed file. The similarity is
|
|
* was used to determine that the two files were related
|
|
* and are a rename, which we have already used, but beyond
|
|
* that we have no use for the similarity. So p->score is
|
|
* now irrelevant. However, process_renames() will need to
|
|
* know which side of the merge this rename was associated
|
|
* with, so overwrite p->score with that value.
|
|
*/
|
|
p->score = side_index;
|
|
result->queue[result->nr++] = p;
|
|
}
|
|
|
|
return clean;
|
|
}
|
|
|
|
static int detect_and_process_renames(struct merge_options *opt,
|
|
struct tree *merge_base,
|
|
struct tree *side1,
|
|
struct tree *side2)
|
|
{
|
|
struct diff_queue_struct combined;
|
|
struct rename_info *renames = &opt->priv->renames;
|
|
int s, clean = 1;
|
|
|
|
memset(&combined, 0, sizeof(combined));
|
|
|
|
detect_regular_renames(opt, merge_base, side1, MERGE_SIDE1);
|
|
detect_regular_renames(opt, merge_base, side2, MERGE_SIDE2);
|
|
|
|
ALLOC_GROW(combined.queue,
|
|
renames->pairs[1].nr + renames->pairs[2].nr,
|
|
combined.alloc);
|
|
clean &= collect_renames(opt, &combined, MERGE_SIDE1);
|
|
clean &= collect_renames(opt, &combined, MERGE_SIDE2);
|
|
QSORT(combined.queue, combined.nr, compare_pairs);
|
|
|
|
clean &= process_renames(opt, &combined);
|
|
|
|
/* Free memory for renames->pairs[] and combined */
|
|
for (s = MERGE_SIDE1; s <= MERGE_SIDE2; s++) {
|
|
free(renames->pairs[s].queue);
|
|
DIFF_QUEUE_CLEAR(&renames->pairs[s]);
|
|
}
|
|
if (combined.nr) {
|
|
int i;
|
|
for (i = 0; i < combined.nr; i++)
|
|
diff_free_filepair(combined.queue[i]);
|
|
free(combined.queue);
|
|
}
|
|
|
|
return clean;
|
|
}
|
|
|
|
/*** Function Grouping: functions related to process_entries() ***/
|
|
|
|
static int string_list_df_name_compare(const char *one, const char *two)
|
|
{
|
|
int onelen = strlen(one);
|
|
int twolen = strlen(two);
|
|
/*
|
|
* Here we only care that entries for D/F conflicts are
|
|
* adjacent, in particular with the file of the D/F conflict
|
|
* appearing before files below the corresponding directory.
|
|
* The order of the rest of the list is irrelevant for us.
|
|
*
|
|
* To achieve this, we sort with df_name_compare and provide
|
|
* the mode S_IFDIR so that D/F conflicts will sort correctly.
|
|
* We use the mode S_IFDIR for everything else for simplicity,
|
|
* since in other cases any changes in their order due to
|
|
* sorting cause no problems for us.
|
|
*/
|
|
int cmp = df_name_compare(one, onelen, S_IFDIR,
|
|
two, twolen, S_IFDIR);
|
|
/*
|
|
* Now that 'foo' and 'foo/bar' compare equal, we have to make sure
|
|
* that 'foo' comes before 'foo/bar'.
|
|
*/
|
|
if (cmp)
|
|
return cmp;
|
|
return onelen - twolen;
|
|
}
|
|
|
|
struct directory_versions {
|
|
/*
|
|
* versions: list of (basename -> version_info)
|
|
*
|
|
* The basenames are in reverse lexicographic order of full pathnames,
|
|
* as processed in process_entries(). This puts all entries within
|
|
* a directory together, and covers the directory itself after
|
|
* everything within it, allowing us to write subtrees before needing
|
|
* to record information for the tree itself.
|
|
*/
|
|
struct string_list versions;
|
|
|
|
/*
|
|
* offsets: list of (full relative path directories -> integer offsets)
|
|
*
|
|
* Since versions contains basenames from files in multiple different
|
|
* directories, we need to know which entries in versions correspond
|
|
* to which directories. Values of e.g.
|
|
* "" 0
|
|
* src 2
|
|
* src/moduleA 5
|
|
* Would mean that entries 0-1 of versions are files in the toplevel
|
|
* directory, entries 2-4 are files under src/, and the remaining
|
|
* entries starting at index 5 are files under src/moduleA/.
|
|
*/
|
|
struct string_list offsets;
|
|
|
|
/*
|
|
* last_directory: directory that previously processed file found in
|
|
*
|
|
* last_directory starts NULL, but records the directory in which the
|
|
* previous file was found within. As soon as
|
|
* directory(current_file) != last_directory
|
|
* then we need to start updating accounting in versions & offsets.
|
|
* Note that last_directory is always the last path in "offsets" (or
|
|
* NULL if "offsets" is empty) so this exists just for quick access.
|
|
*/
|
|
const char *last_directory;
|
|
|
|
/* last_directory_len: cached computation of strlen(last_directory) */
|
|
unsigned last_directory_len;
|
|
};
|
|
|
|
static int tree_entry_order(const void *a_, const void *b_)
|
|
{
|
|
const struct string_list_item *a = a_;
|
|
const struct string_list_item *b = b_;
|
|
|
|
const struct merged_info *ami = a->util;
|
|
const struct merged_info *bmi = b->util;
|
|
return base_name_compare(a->string, strlen(a->string), ami->result.mode,
|
|
b->string, strlen(b->string), bmi->result.mode);
|
|
}
|
|
|
|
static void write_tree(struct object_id *result_oid,
|
|
struct string_list *versions,
|
|
unsigned int offset,
|
|
size_t hash_size)
|
|
{
|
|
size_t maxlen = 0, extra;
|
|
unsigned int nr = versions->nr - offset;
|
|
struct strbuf buf = STRBUF_INIT;
|
|
struct string_list relevant_entries = STRING_LIST_INIT_NODUP;
|
|
int i;
|
|
|
|
/*
|
|
* We want to sort the last (versions->nr-offset) entries in versions.
|
|
* Do so by abusing the string_list API a bit: make another string_list
|
|
* that contains just those entries and then sort them.
|
|
*
|
|
* We won't use relevant_entries again and will let it just pop off the
|
|
* stack, so there won't be allocation worries or anything.
|
|
*/
|
|
relevant_entries.items = versions->items + offset;
|
|
relevant_entries.nr = versions->nr - offset;
|
|
QSORT(relevant_entries.items, relevant_entries.nr, tree_entry_order);
|
|
|
|
/* Pre-allocate some space in buf */
|
|
extra = hash_size + 8; /* 8: 6 for mode, 1 for space, 1 for NUL char */
|
|
for (i = 0; i < nr; i++) {
|
|
maxlen += strlen(versions->items[offset+i].string) + extra;
|
|
}
|
|
strbuf_grow(&buf, maxlen);
|
|
|
|
/* Write each entry out to buf */
|
|
for (i = 0; i < nr; i++) {
|
|
struct merged_info *mi = versions->items[offset+i].util;
|
|
struct version_info *ri = &mi->result;
|
|
strbuf_addf(&buf, "%o %s%c",
|
|
ri->mode,
|
|
versions->items[offset+i].string, '\0');
|
|
strbuf_add(&buf, ri->oid.hash, hash_size);
|
|
}
|
|
|
|
/* Write this object file out, and record in result_oid */
|
|
write_object_file(buf.buf, buf.len, tree_type, result_oid);
|
|
strbuf_release(&buf);
|
|
}
|
|
|
|
static void record_entry_for_tree(struct directory_versions *dir_metadata,
|
|
const char *path,
|
|
struct merged_info *mi)
|
|
{
|
|
const char *basename;
|
|
|
|
if (mi->is_null)
|
|
/* nothing to record */
|
|
return;
|
|
|
|
basename = path + mi->basename_offset;
|
|
assert(strchr(basename, '/') == NULL);
|
|
string_list_append(&dir_metadata->versions,
|
|
basename)->util = &mi->result;
|
|
}
|
|
|
|
static void write_completed_directory(struct merge_options *opt,
|
|
const char *new_directory_name,
|
|
struct directory_versions *info)
|
|
{
|
|
const char *prev_dir;
|
|
struct merged_info *dir_info = NULL;
|
|
unsigned int offset;
|
|
|
|
/*
|
|
* Some explanation of info->versions and info->offsets...
|
|
*
|
|
* process_entries() iterates over all relevant files AND
|
|
* directories in reverse lexicographic order, and calls this
|
|
* function. Thus, an example of the paths that process_entries()
|
|
* could operate on (along with the directories for those paths
|
|
* being shown) is:
|
|
*
|
|
* xtract.c ""
|
|
* tokens.txt ""
|
|
* src/moduleB/umm.c src/moduleB
|
|
* src/moduleB/stuff.h src/moduleB
|
|
* src/moduleB/baz.c src/moduleB
|
|
* src/moduleB src
|
|
* src/moduleA/foo.c src/moduleA
|
|
* src/moduleA/bar.c src/moduleA
|
|
* src/moduleA src
|
|
* src ""
|
|
* Makefile ""
|
|
*
|
|
* info->versions:
|
|
*
|
|
* always contains the unprocessed entries and their
|
|
* version_info information. For example, after the first five
|
|
* entries above, info->versions would be:
|
|
*
|
|
* xtract.c <xtract.c's version_info>
|
|
* token.txt <token.txt's version_info>
|
|
* umm.c <src/moduleB/umm.c's version_info>
|
|
* stuff.h <src/moduleB/stuff.h's version_info>
|
|
* baz.c <src/moduleB/baz.c's version_info>
|
|
*
|
|
* Once a subdirectory is completed we remove the entries in
|
|
* that subdirectory from info->versions, writing it as a tree
|
|
* (write_tree()). Thus, as soon as we get to src/moduleB,
|
|
* info->versions would be updated to
|
|
*
|
|
* xtract.c <xtract.c's version_info>
|
|
* token.txt <token.txt's version_info>
|
|
* moduleB <src/moduleB's version_info>
|
|
*
|
|
* info->offsets:
|
|
*
|
|
* helps us track which entries in info->versions correspond to
|
|
* which directories. When we are N directories deep (e.g. 4
|
|
* for src/modA/submod/subdir/), we have up to N+1 unprocessed
|
|
* directories (+1 because of toplevel dir). Corresponding to
|
|
* the info->versions example above, after processing five entries
|
|
* info->offsets will be:
|
|
*
|
|
* "" 0
|
|
* src/moduleB 2
|
|
*
|
|
* which is used to know that xtract.c & token.txt are from the
|
|
* toplevel dirctory, while umm.c & stuff.h & baz.c are from the
|
|
* src/moduleB directory. Again, following the example above,
|
|
* once we need to process src/moduleB, then info->offsets is
|
|
* updated to
|
|
*
|
|
* "" 0
|
|
* src 2
|
|
*
|
|
* which says that moduleB (and only moduleB so far) is in the
|
|
* src directory.
|
|
*
|
|
* One unique thing to note about info->offsets here is that
|
|
* "src" was not added to info->offsets until there was a path
|
|
* (a file OR directory) immediately below src/ that got
|
|
* processed.
|
|
*
|
|
* Since process_entry() just appends new entries to info->versions,
|
|
* write_completed_directory() only needs to do work if the next path
|
|
* is in a directory that is different than the last directory found
|
|
* in info->offsets.
|
|
*/
|
|
|
|
/*
|
|
* If we are working with the same directory as the last entry, there
|
|
* is no work to do. (See comments above the directory_name member of
|
|
* struct merged_info for why we can use pointer comparison instead of
|
|
* strcmp here.)
|
|
*/
|
|
if (new_directory_name == info->last_directory)
|
|
return;
|
|
|
|
/*
|
|
* If we are just starting (last_directory is NULL), or last_directory
|
|
* is a prefix of the current directory, then we can just update
|
|
* info->offsets to record the offset where we started this directory
|
|
* and update last_directory to have quick access to it.
|
|
*/
|
|
if (info->last_directory == NULL ||
|
|
!strncmp(new_directory_name, info->last_directory,
|
|
info->last_directory_len)) {
|
|
uintptr_t offset = info->versions.nr;
|
|
|
|
info->last_directory = new_directory_name;
|
|
info->last_directory_len = strlen(info->last_directory);
|
|
/*
|
|
* Record the offset into info->versions where we will
|
|
* start recording basenames of paths found within
|
|
* new_directory_name.
|
|
*/
|
|
string_list_append(&info->offsets,
|
|
info->last_directory)->util = (void*)offset;
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* The next entry that will be processed will be within
|
|
* new_directory_name. Since at this point we know that
|
|
* new_directory_name is within a different directory than
|
|
* info->last_directory, we have all entries for info->last_directory
|
|
* in info->versions and we need to create a tree object for them.
|
|
*/
|
|
dir_info = strmap_get(&opt->priv->paths, info->last_directory);
|
|
assert(dir_info);
|
|
offset = (uintptr_t)info->offsets.items[info->offsets.nr-1].util;
|
|
if (offset == info->versions.nr) {
|
|
/*
|
|
* Actually, we don't need to create a tree object in this
|
|
* case. Whenever all files within a directory disappear
|
|
* during the merge (e.g. unmodified on one side and
|
|
* deleted on the other, or files were renamed elsewhere),
|
|
* then we get here and the directory itself needs to be
|
|
* omitted from its parent tree as well.
|
|
*/
|
|
dir_info->is_null = 1;
|
|
} else {
|
|
/*
|
|
* Write out the tree to the git object directory, and also
|
|
* record the mode and oid in dir_info->result.
|
|
*/
|
|
dir_info->is_null = 0;
|
|
dir_info->result.mode = S_IFDIR;
|
|
write_tree(&dir_info->result.oid, &info->versions, offset,
|
|
opt->repo->hash_algo->rawsz);
|
|
}
|
|
|
|
/*
|
|
* We've now used several entries from info->versions and one entry
|
|
* from info->offsets, so we get rid of those values.
|
|
*/
|
|
info->offsets.nr--;
|
|
info->versions.nr = offset;
|
|
|
|
/*
|
|
* Now we've taken care of the completed directory, but we need to
|
|
* prepare things since future entries will be in
|
|
* new_directory_name. (In particular, process_entry() will be
|
|
* appending new entries to info->versions.) So, we need to make
|
|
* sure new_directory_name is the last entry in info->offsets.
|
|
*/
|
|
prev_dir = info->offsets.nr == 0 ? NULL :
|
|
info->offsets.items[info->offsets.nr-1].string;
|
|
if (new_directory_name != prev_dir) {
|
|
uintptr_t c = info->versions.nr;
|
|
string_list_append(&info->offsets,
|
|
new_directory_name)->util = (void*)c;
|
|
}
|
|
|
|
/* And, of course, we need to update last_directory to match. */
|
|
info->last_directory = new_directory_name;
|
|
info->last_directory_len = strlen(info->last_directory);
|
|
}
|
|
|
|
/* Per entry merge function */
|
|
static void process_entry(struct merge_options *opt,
|
|
const char *path,
|
|
struct conflict_info *ci,
|
|
struct directory_versions *dir_metadata)
|
|
{
|
|
VERIFY_CI(ci);
|
|
assert(ci->filemask >= 0 && ci->filemask <= 7);
|
|
/* ci->match_mask == 7 was handled in collect_merge_info_callback() */
|
|
assert(ci->match_mask == 0 || ci->match_mask == 3 ||
|
|
ci->match_mask == 5 || ci->match_mask == 6);
|
|
|
|
if (ci->dirmask) {
|
|
record_entry_for_tree(dir_metadata, path, &ci->merged);
|
|
if (ci->filemask == 0)
|
|
/* nothing else to handle */
|
|
return;
|
|
assert(ci->df_conflict);
|
|
}
|
|
|
|
if (ci->df_conflict) {
|
|
die("Not yet implemented.");
|
|
}
|
|
|
|
/*
|
|
* NOTE: Below there is a long switch-like if-elseif-elseif... block
|
|
* which the code goes through even for the df_conflict cases
|
|
* above. Well, it will once we don't die-not-implemented above.
|
|
*/
|
|
if (ci->match_mask) {
|
|
ci->merged.clean = 1;
|
|
if (ci->match_mask == 6) {
|
|
/* stages[1] == stages[2] */
|
|
ci->merged.result.mode = ci->stages[1].mode;
|
|
oidcpy(&ci->merged.result.oid, &ci->stages[1].oid);
|
|
} else {
|
|
/* determine the mask of the side that didn't match */
|
|
unsigned int othermask = 7 & ~ci->match_mask;
|
|
int side = (othermask == 4) ? 2 : 1;
|
|
|
|
ci->merged.result.mode = ci->stages[side].mode;
|
|
ci->merged.is_null = !ci->merged.result.mode;
|
|
oidcpy(&ci->merged.result.oid, &ci->stages[side].oid);
|
|
|
|
assert(othermask == 2 || othermask == 4);
|
|
assert(ci->merged.is_null ==
|
|
(ci->filemask == ci->match_mask));
|
|
}
|
|
} else if (ci->filemask >= 6 &&
|
|
(S_IFMT & ci->stages[1].mode) !=
|
|
(S_IFMT & ci->stages[2].mode)) {
|
|
/*
|
|
* Two different items from (file/submodule/symlink)
|
|
*/
|
|
die("Not yet implemented.");
|
|
} else if (ci->filemask >= 6) {
|
|
/*
|
|
* TODO: Needs a two-way or three-way content merge, but we're
|
|
* just being lazy and copying the version from HEAD and
|
|
* leaving it as conflicted.
|
|
*/
|
|
ci->merged.clean = 0;
|
|
ci->merged.result.mode = ci->stages[1].mode;
|
|
oidcpy(&ci->merged.result.oid, &ci->stages[1].oid);
|
|
/* When we fix above, we'll call handle_content_merge() */
|
|
(void)handle_content_merge;
|
|
} else if (ci->filemask == 3 || ci->filemask == 5) {
|
|
/* Modify/delete */
|
|
const char *modify_branch, *delete_branch;
|
|
int side = (ci->filemask == 5) ? 2 : 1;
|
|
int index = opt->priv->call_depth ? 0 : side;
|
|
|
|
ci->merged.result.mode = ci->stages[index].mode;
|
|
oidcpy(&ci->merged.result.oid, &ci->stages[index].oid);
|
|
ci->merged.clean = 0;
|
|
|
|
modify_branch = (side == 1) ? opt->branch1 : opt->branch2;
|
|
delete_branch = (side == 1) ? opt->branch2 : opt->branch1;
|
|
|
|
if (ci->path_conflict &&
|
|
oideq(&ci->stages[0].oid, &ci->stages[side].oid)) {
|
|
/*
|
|
* This came from a rename/delete; no action to take,
|
|
* but avoid printing "modify/delete" conflict notice
|
|
* since the contents were not modified.
|
|
*/
|
|
} else {
|
|
path_msg(opt, path, 0,
|
|
_("CONFLICT (modify/delete): %s deleted in %s "
|
|
"and modified in %s. Version %s of %s left "
|
|
"in tree."),
|
|
path, delete_branch, modify_branch,
|
|
modify_branch, path);
|
|
}
|
|
} else if (ci->filemask == 2 || ci->filemask == 4) {
|
|
/* Added on one side */
|
|
int side = (ci->filemask == 4) ? 2 : 1;
|
|
ci->merged.result.mode = ci->stages[side].mode;
|
|
oidcpy(&ci->merged.result.oid, &ci->stages[side].oid);
|
|
ci->merged.clean = !ci->df_conflict && !ci->path_conflict;
|
|
} else if (ci->filemask == 1) {
|
|
/* Deleted on both sides */
|
|
ci->merged.is_null = 1;
|
|
ci->merged.result.mode = 0;
|
|
oidcpy(&ci->merged.result.oid, &null_oid);
|
|
ci->merged.clean = !ci->path_conflict;
|
|
}
|
|
|
|
/*
|
|
* If still conflicted, record it separately. This allows us to later
|
|
* iterate over just conflicted entries when updating the index instead
|
|
* of iterating over all entries.
|
|
*/
|
|
if (!ci->merged.clean)
|
|
strmap_put(&opt->priv->conflicted, path, ci);
|
|
record_entry_for_tree(dir_metadata, path, &ci->merged);
|
|
}
|
|
|
|
static void process_entries(struct merge_options *opt,
|
|
struct object_id *result_oid)
|
|
{
|
|
struct hashmap_iter iter;
|
|
struct strmap_entry *e;
|
|
struct string_list plist = STRING_LIST_INIT_NODUP;
|
|
struct string_list_item *entry;
|
|
struct directory_versions dir_metadata = { STRING_LIST_INIT_NODUP,
|
|
STRING_LIST_INIT_NODUP,
|
|
NULL, 0 };
|
|
|
|
if (strmap_empty(&opt->priv->paths)) {
|
|
oidcpy(result_oid, opt->repo->hash_algo->empty_tree);
|
|
return;
|
|
}
|
|
|
|
/* Hack to pre-allocate plist to the desired size */
|
|
ALLOC_GROW(plist.items, strmap_get_size(&opt->priv->paths), plist.alloc);
|
|
|
|
/* Put every entry from paths into plist, then sort */
|
|
strmap_for_each_entry(&opt->priv->paths, &iter, e) {
|
|
string_list_append(&plist, e->key)->util = e->value;
|
|
}
|
|
plist.cmp = string_list_df_name_compare;
|
|
string_list_sort(&plist);
|
|
|
|
/*
|
|
* Iterate over the items in reverse order, so we can handle paths
|
|
* below a directory before needing to handle the directory itself.
|
|
*
|
|
* This allows us to write subtrees before we need to write trees,
|
|
* and it also enables sane handling of directory/file conflicts
|
|
* (because it allows us to know whether the directory is still in
|
|
* the way when it is time to process the file at the same path).
|
|
*/
|
|
for (entry = &plist.items[plist.nr-1]; entry >= plist.items; --entry) {
|
|
char *path = entry->string;
|
|
/*
|
|
* NOTE: mi may actually be a pointer to a conflict_info, but
|
|
* we have to check mi->clean first to see if it's safe to
|
|
* reassign to such a pointer type.
|
|
*/
|
|
struct merged_info *mi = entry->util;
|
|
|
|
write_completed_directory(opt, mi->directory_name,
|
|
&dir_metadata);
|
|
if (mi->clean)
|
|
record_entry_for_tree(&dir_metadata, path, mi);
|
|
else {
|
|
struct conflict_info *ci = (struct conflict_info *)mi;
|
|
process_entry(opt, path, ci, &dir_metadata);
|
|
}
|
|
}
|
|
|
|
if (dir_metadata.offsets.nr != 1 ||
|
|
(uintptr_t)dir_metadata.offsets.items[0].util != 0) {
|
|
printf("dir_metadata.offsets.nr = %d (should be 1)\n",
|
|
dir_metadata.offsets.nr);
|
|
printf("dir_metadata.offsets.items[0].util = %u (should be 0)\n",
|
|
(unsigned)(uintptr_t)dir_metadata.offsets.items[0].util);
|
|
fflush(stdout);
|
|
BUG("dir_metadata accounting completely off; shouldn't happen");
|
|
}
|
|
write_tree(result_oid, &dir_metadata.versions, 0,
|
|
opt->repo->hash_algo->rawsz);
|
|
string_list_clear(&plist, 0);
|
|
string_list_clear(&dir_metadata.versions, 0);
|
|
string_list_clear(&dir_metadata.offsets, 0);
|
|
}
|
|
|
|
/*** Function Grouping: functions related to merge_switch_to_result() ***/
|
|
|
|
static int checkout(struct merge_options *opt,
|
|
struct tree *prev,
|
|
struct tree *next)
|
|
{
|
|
/* Switch the index/working copy from old to new */
|
|
int ret;
|
|
struct tree_desc trees[2];
|
|
struct unpack_trees_options unpack_opts;
|
|
|
|
memset(&unpack_opts, 0, sizeof(unpack_opts));
|
|
unpack_opts.head_idx = -1;
|
|
unpack_opts.src_index = opt->repo->index;
|
|
unpack_opts.dst_index = opt->repo->index;
|
|
|
|
setup_unpack_trees_porcelain(&unpack_opts, "merge");
|
|
|
|
/*
|
|
* NOTE: if this were just "git checkout" code, we would probably
|
|
* read or refresh the cache and check for a conflicted index, but
|
|
* builtin/merge.c or sequencer.c really needs to read the index
|
|
* and check for conflicted entries before starting merging for a
|
|
* good user experience (no sense waiting for merges/rebases before
|
|
* erroring out), so there's no reason to duplicate that work here.
|
|
*/
|
|
|
|
/* 2-way merge to the new branch */
|
|
unpack_opts.update = 1;
|
|
unpack_opts.merge = 1;
|
|
unpack_opts.quiet = 0; /* FIXME: sequencer might want quiet? */
|
|
unpack_opts.verbose_update = (opt->verbosity > 2);
|
|
unpack_opts.fn = twoway_merge;
|
|
if (1/* FIXME: opts->overwrite_ignore*/) {
|
|
unpack_opts.dir = xcalloc(1, sizeof(*unpack_opts.dir));
|
|
unpack_opts.dir->flags |= DIR_SHOW_IGNORED;
|
|
setup_standard_excludes(unpack_opts.dir);
|
|
}
|
|
parse_tree(prev);
|
|
init_tree_desc(&trees[0], prev->buffer, prev->size);
|
|
parse_tree(next);
|
|
init_tree_desc(&trees[1], next->buffer, next->size);
|
|
|
|
ret = unpack_trees(2, trees, &unpack_opts);
|
|
clear_unpack_trees_porcelain(&unpack_opts);
|
|
dir_clear(unpack_opts.dir);
|
|
FREE_AND_NULL(unpack_opts.dir);
|
|
return ret;
|
|
}
|
|
|
|
static int record_conflicted_index_entries(struct merge_options *opt,
|
|
struct index_state *index,
|
|
struct strmap *paths,
|
|
struct strmap *conflicted)
|
|
{
|
|
struct hashmap_iter iter;
|
|
struct strmap_entry *e;
|
|
int errs = 0;
|
|
int original_cache_nr;
|
|
|
|
if (strmap_empty(conflicted))
|
|
return 0;
|
|
|
|
original_cache_nr = index->cache_nr;
|
|
|
|
/* Put every entry from paths into plist, then sort */
|
|
strmap_for_each_entry(conflicted, &iter, e) {
|
|
const char *path = e->key;
|
|
struct conflict_info *ci = e->value;
|
|
int pos;
|
|
struct cache_entry *ce;
|
|
int i;
|
|
|
|
VERIFY_CI(ci);
|
|
|
|
/*
|
|
* The index will already have a stage=0 entry for this path,
|
|
* because we created an as-merged-as-possible version of the
|
|
* file and checkout() moved the working copy and index over
|
|
* to that version.
|
|
*
|
|
* However, previous iterations through this loop will have
|
|
* added unstaged entries to the end of the cache which
|
|
* ignore the standard alphabetical ordering of cache
|
|
* entries and break invariants needed for index_name_pos()
|
|
* to work. However, we know the entry we want is before
|
|
* those appended cache entries, so do a temporary swap on
|
|
* cache_nr to only look through entries of interest.
|
|
*/
|
|
SWAP(index->cache_nr, original_cache_nr);
|
|
pos = index_name_pos(index, path, strlen(path));
|
|
SWAP(index->cache_nr, original_cache_nr);
|
|
if (pos < 0) {
|
|
if (ci->filemask != 1)
|
|
BUG("Conflicted %s but nothing in basic working tree or index; this shouldn't happen", path);
|
|
cache_tree_invalidate_path(index, path);
|
|
} else {
|
|
ce = index->cache[pos];
|
|
|
|
/*
|
|
* Clean paths with CE_SKIP_WORKTREE set will not be
|
|
* written to the working tree by the unpack_trees()
|
|
* call in checkout(). Our conflicted entries would
|
|
* have appeared clean to that code since we ignored
|
|
* the higher order stages. Thus, we need override
|
|
* the CE_SKIP_WORKTREE bit and manually write those
|
|
* files to the working disk here.
|
|
*
|
|
* TODO: Implement this CE_SKIP_WORKTREE fixup.
|
|
*/
|
|
|
|
/*
|
|
* Mark this cache entry for removal and instead add
|
|
* new stage>0 entries corresponding to the
|
|
* conflicts. If there are many conflicted entries, we
|
|
* want to avoid memmove'ing O(NM) entries by
|
|
* inserting the new entries one at a time. So,
|
|
* instead, we just add the new cache entries to the
|
|
* end (ignoring normal index requirements on sort
|
|
* order) and sort the index once we're all done.
|
|
*/
|
|
ce->ce_flags |= CE_REMOVE;
|
|
}
|
|
|
|
for (i = MERGE_BASE; i <= MERGE_SIDE2; i++) {
|
|
struct version_info *vi;
|
|
if (!(ci->filemask & (1ul << i)))
|
|
continue;
|
|
vi = &ci->stages[i];
|
|
ce = make_cache_entry(index, vi->mode, &vi->oid,
|
|
path, i+1, 0);
|
|
add_index_entry(index, ce, ADD_CACHE_JUST_APPEND);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Remove the unused cache entries (and invalidate the relevant
|
|
* cache-trees), then sort the index entries to get the conflicted
|
|
* entries we added to the end into their right locations.
|
|
*/
|
|
remove_marked_cache_entries(index, 1);
|
|
QSORT(index->cache, index->cache_nr, cmp_cache_name_compare);
|
|
|
|
return errs;
|
|
}
|
|
|
|
void merge_switch_to_result(struct merge_options *opt,
|
|
struct tree *head,
|
|
struct merge_result *result,
|
|
int update_worktree_and_index,
|
|
int display_update_msgs)
|
|
{
|
|
assert(opt->priv == NULL);
|
|
if (result->clean >= 0 && update_worktree_and_index) {
|
|
struct merge_options_internal *opti = result->priv;
|
|
|
|
if (checkout(opt, head, result->tree)) {
|
|
/* failure to function */
|
|
result->clean = -1;
|
|
return;
|
|
}
|
|
|
|
if (record_conflicted_index_entries(opt, opt->repo->index,
|
|
&opti->paths,
|
|
&opti->conflicted)) {
|
|
/* failure to function */
|
|
result->clean = -1;
|
|
return;
|
|
}
|
|
}
|
|
|
|
if (display_update_msgs) {
|
|
struct merge_options_internal *opti = result->priv;
|
|
struct hashmap_iter iter;
|
|
struct strmap_entry *e;
|
|
struct string_list olist = STRING_LIST_INIT_NODUP;
|
|
int i;
|
|
|
|
/* Hack to pre-allocate olist to the desired size */
|
|
ALLOC_GROW(olist.items, strmap_get_size(&opti->output),
|
|
olist.alloc);
|
|
|
|
/* Put every entry from output into olist, then sort */
|
|
strmap_for_each_entry(&opti->output, &iter, e) {
|
|
string_list_append(&olist, e->key)->util = e->value;
|
|
}
|
|
string_list_sort(&olist);
|
|
|
|
/* Iterate over the items, printing them */
|
|
for (i = 0; i < olist.nr; ++i) {
|
|
struct strbuf *sb = olist.items[i].util;
|
|
|
|
printf("%s", sb->buf);
|
|
}
|
|
string_list_clear(&olist, 0);
|
|
|
|
/* Also include needed rename limit adjustment now */
|
|
diff_warn_rename_limit("merge.renamelimit",
|
|
opti->renames.needed_limit, 0);
|
|
}
|
|
|
|
merge_finalize(opt, result);
|
|
}
|
|
|
|
void merge_finalize(struct merge_options *opt,
|
|
struct merge_result *result)
|
|
{
|
|
struct merge_options_internal *opti = result->priv;
|
|
|
|
assert(opt->priv == NULL);
|
|
|
|
clear_or_reinit_internal_opts(opti, 0);
|
|
FREE_AND_NULL(opti);
|
|
}
|
|
|
|
/*** Function Grouping: helper functions for merge_incore_*() ***/
|
|
|
|
static inline void set_commit_tree(struct commit *c, struct tree *t)
|
|
{
|
|
c->maybe_tree = t;
|
|
}
|
|
|
|
static struct commit *make_virtual_commit(struct repository *repo,
|
|
struct tree *tree,
|
|
const char *comment)
|
|
{
|
|
struct commit *commit = alloc_commit_node(repo);
|
|
|
|
set_merge_remote_desc(commit, comment, (struct object *)commit);
|
|
set_commit_tree(commit, tree);
|
|
commit->object.parsed = 1;
|
|
return commit;
|
|
}
|
|
|
|
static void merge_start(struct merge_options *opt, struct merge_result *result)
|
|
{
|
|
/* Sanity checks on opt */
|
|
assert(opt->repo);
|
|
|
|
assert(opt->branch1 && opt->branch2);
|
|
|
|
assert(opt->detect_directory_renames >= MERGE_DIRECTORY_RENAMES_NONE &&
|
|
opt->detect_directory_renames <= MERGE_DIRECTORY_RENAMES_TRUE);
|
|
assert(opt->rename_limit >= -1);
|
|
assert(opt->rename_score >= 0 && opt->rename_score <= MAX_SCORE);
|
|
assert(opt->show_rename_progress >= 0 && opt->show_rename_progress <= 1);
|
|
|
|
assert(opt->xdl_opts >= 0);
|
|
assert(opt->recursive_variant >= MERGE_VARIANT_NORMAL &&
|
|
opt->recursive_variant <= MERGE_VARIANT_THEIRS);
|
|
|
|
/*
|
|
* detect_renames, verbosity, buffer_output, and obuf are ignored
|
|
* fields that were used by "recursive" rather than "ort" -- but
|
|
* sanity check them anyway.
|
|
*/
|
|
assert(opt->detect_renames >= -1 &&
|
|
opt->detect_renames <= DIFF_DETECT_COPY);
|
|
assert(opt->verbosity >= 0 && opt->verbosity <= 5);
|
|
assert(opt->buffer_output <= 2);
|
|
assert(opt->obuf.len == 0);
|
|
|
|
assert(opt->priv == NULL);
|
|
|
|
/* Default to histogram diff. Actually, just hardcode it...for now. */
|
|
opt->xdl_opts = DIFF_WITH_ALG(opt, HISTOGRAM_DIFF);
|
|
|
|
/* Initialization of opt->priv, our internal merge data */
|
|
opt->priv = xcalloc(1, sizeof(*opt->priv));
|
|
|
|
/*
|
|
* Although we initialize opt->priv->paths with strdup_strings=0,
|
|
* that's just to avoid making yet another copy of an allocated
|
|
* string. Putting the entry into paths means we are taking
|
|
* ownership, so we will later free it. paths_to_free is similar.
|
|
*
|
|
* In contrast, conflicted just has a subset of keys from paths, so
|
|
* we don't want to free those (it'd be a duplicate free).
|
|
*/
|
|
strmap_init_with_options(&opt->priv->paths, NULL, 0);
|
|
strmap_init_with_options(&opt->priv->conflicted, NULL, 0);
|
|
string_list_init(&opt->priv->paths_to_free, 0);
|
|
|
|
/*
|
|
* keys & strbufs in output will sometimes need to outlive "paths",
|
|
* so it will have a copy of relevant keys. It's probably a small
|
|
* subset of the overall paths that have special output.
|
|
*/
|
|
strmap_init(&opt->priv->output);
|
|
}
|
|
|
|
/*** Function Grouping: merge_incore_*() and their internal variants ***/
|
|
|
|
/*
|
|
* Originally from merge_trees_internal(); heavily adapted, though.
|
|
*/
|
|
static void merge_ort_nonrecursive_internal(struct merge_options *opt,
|
|
struct tree *merge_base,
|
|
struct tree *side1,
|
|
struct tree *side2,
|
|
struct merge_result *result)
|
|
{
|
|
struct object_id working_tree_oid;
|
|
|
|
if (collect_merge_info(opt, merge_base, side1, side2) != 0) {
|
|
/*
|
|
* TRANSLATORS: The %s arguments are: 1) tree hash of a merge
|
|
* base, and 2-3) the trees for the two trees we're merging.
|
|
*/
|
|
err(opt, _("collecting merge info failed for trees %s, %s, %s"),
|
|
oid_to_hex(&merge_base->object.oid),
|
|
oid_to_hex(&side1->object.oid),
|
|
oid_to_hex(&side2->object.oid));
|
|
result->clean = -1;
|
|
return;
|
|
}
|
|
|
|
result->clean = detect_and_process_renames(opt, merge_base,
|
|
side1, side2);
|
|
process_entries(opt, &working_tree_oid);
|
|
|
|
/* Set return values */
|
|
result->tree = parse_tree_indirect(&working_tree_oid);
|
|
/* existence of conflicted entries implies unclean */
|
|
result->clean &= strmap_empty(&opt->priv->conflicted);
|
|
if (!opt->priv->call_depth) {
|
|
result->priv = opt->priv;
|
|
opt->priv = NULL;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Originally from merge_recursive_internal(); somewhat adapted, though.
|
|
*/
|
|
static void merge_ort_internal(struct merge_options *opt,
|
|
struct commit_list *merge_bases,
|
|
struct commit *h1,
|
|
struct commit *h2,
|
|
struct merge_result *result)
|
|
{
|
|
struct commit_list *iter;
|
|
struct commit *merged_merge_bases;
|
|
const char *ancestor_name;
|
|
struct strbuf merge_base_abbrev = STRBUF_INIT;
|
|
|
|
if (!merge_bases) {
|
|
merge_bases = get_merge_bases(h1, h2);
|
|
/* See merge-ort.h:merge_incore_recursive() declaration NOTE */
|
|
merge_bases = reverse_commit_list(merge_bases);
|
|
}
|
|
|
|
merged_merge_bases = pop_commit(&merge_bases);
|
|
if (merged_merge_bases == NULL) {
|
|
/* if there is no common ancestor, use an empty tree */
|
|
struct tree *tree;
|
|
|
|
tree = lookup_tree(opt->repo, opt->repo->hash_algo->empty_tree);
|
|
merged_merge_bases = make_virtual_commit(opt->repo, tree,
|
|
"ancestor");
|
|
ancestor_name = "empty tree";
|
|
} else if (merge_bases) {
|
|
ancestor_name = "merged common ancestors";
|
|
} else {
|
|
strbuf_add_unique_abbrev(&merge_base_abbrev,
|
|
&merged_merge_bases->object.oid,
|
|
DEFAULT_ABBREV);
|
|
ancestor_name = merge_base_abbrev.buf;
|
|
}
|
|
|
|
for (iter = merge_bases; iter; iter = iter->next) {
|
|
const char *saved_b1, *saved_b2;
|
|
struct commit *prev = merged_merge_bases;
|
|
|
|
opt->priv->call_depth++;
|
|
/*
|
|
* When the merge fails, the result contains files
|
|
* with conflict markers. The cleanness flag is
|
|
* ignored (unless indicating an error), it was never
|
|
* actually used, as result of merge_trees has always
|
|
* overwritten it: the committed "conflicts" were
|
|
* already resolved.
|
|
*/
|
|
saved_b1 = opt->branch1;
|
|
saved_b2 = opt->branch2;
|
|
opt->branch1 = "Temporary merge branch 1";
|
|
opt->branch2 = "Temporary merge branch 2";
|
|
merge_ort_internal(opt, NULL, prev, iter->item, result);
|
|
if (result->clean < 0)
|
|
return;
|
|
opt->branch1 = saved_b1;
|
|
opt->branch2 = saved_b2;
|
|
opt->priv->call_depth--;
|
|
|
|
merged_merge_bases = make_virtual_commit(opt->repo,
|
|
result->tree,
|
|
"merged tree");
|
|
commit_list_insert(prev, &merged_merge_bases->parents);
|
|
commit_list_insert(iter->item,
|
|
&merged_merge_bases->parents->next);
|
|
|
|
clear_or_reinit_internal_opts(opt->priv, 1);
|
|
}
|
|
|
|
opt->ancestor = ancestor_name;
|
|
merge_ort_nonrecursive_internal(opt,
|
|
repo_get_commit_tree(opt->repo,
|
|
merged_merge_bases),
|
|
repo_get_commit_tree(opt->repo, h1),
|
|
repo_get_commit_tree(opt->repo, h2),
|
|
result);
|
|
strbuf_release(&merge_base_abbrev);
|
|
opt->ancestor = NULL; /* avoid accidental re-use of opt->ancestor */
|
|
}
|
|
|
|
void merge_incore_nonrecursive(struct merge_options *opt,
|
|
struct tree *merge_base,
|
|
struct tree *side1,
|
|
struct tree *side2,
|
|
struct merge_result *result)
|
|
{
|
|
assert(opt->ancestor != NULL);
|
|
merge_start(opt, result);
|
|
merge_ort_nonrecursive_internal(opt, merge_base, side1, side2, result);
|
|
}
|
|
|
|
void merge_incore_recursive(struct merge_options *opt,
|
|
struct commit_list *merge_bases,
|
|
struct commit *side1,
|
|
struct commit *side2,
|
|
struct merge_result *result)
|
|
{
|
|
/* We set the ancestor label based on the merge_bases */
|
|
assert(opt->ancestor == NULL);
|
|
|
|
merge_start(opt, result);
|
|
merge_ort_internal(opt, merge_bases, side1, side2, result);
|
|
}
|