Teach "-X <option>" command line argument to "git merge" that is passed to
strategy implementations. "ours" and "theirs" autoresolution introduced
by the previous commit can be asked to the recursive strategy.
Signed-off-by: Avery Pennarun <apenwarr@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
The construction of the struct unpack_trees_error_msgs was done within
git_merge_trees(), which prevented using the same messages easily from
another function.
[jc: backported for 1.6.5 maint before advice_commit_before_merge]
Signed-off-by: Matthieu Moy <Matthieu.Moy@imag.fr>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
* mm/maint-hint-failed-merge:
user-manual: Document that "git merge" doesn't like uncommited changes.
merge-recursive: point the user to commit when file would be overwritten.
The commit-before-pull is well accepted in the DVCS community, but is
confusing some new users. This should get them back in the right way when
the problem occurs.
Signed-off-by: Matthieu Moy <Matthieu.Moy@imag.fr>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
We already have these checks in many printf-type functions that have
prototypes which are in header files. Add these same checks to some
more prototypes in header functions and to static functions in .c
files.
cc: Miklos Vajna <vmiklos@frugalware.org>
Signed-off-by: Tarmigan Casebolt <tarmigan+git@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
When unpack_trees() three-way merge logic is called from merge-recursive
and finds that local changes are going to be clobbered, its plumbing level
messages were given as errors first, and then the merge driver added even
more scary message "fatal: merging of trees <a long object name> and
<another long object name> failed".
This is most often encountered by new CVS/SVN migrants who are used to
start a merge from a dirty work tree. The saddest part is that the merge
refused to run to prevent _any_ damage from being done to your work tree
when these messages are given, but the messages look a lot more scarier
than the conflicted case where the user needs to resolve them.
Replace the plumbing level messages so that they talk about what it is
protecting the user from, and end the messages with "Aborting." so that it
becomes clear that the command did not do any harm.
The final "merging of trees failed" message is superfluous, unless you are
interested in debugging the merge-recursive itself. Squelch the current
die() message by default, but allow it to help people who debug git with
verbosity level 4 or greater.
Unless there is some bug, an inner merge that does not touch working tree
should not trigger any such error, so emit the current die() message when
we see an error return from it while running the inner merge, too. It
would also help people who debug git.
We could later add instructions on how to recover (i.e. "stash changes
away or commit on a side branch and retry") instead of the silent
exit(128) I have in this patch, and then use Peff's advice.* mechanism to
squelch it (e.g. "advice.mergeindirtytree"), but they are separate topics.
Tested-by: Nanako Shiraishi <nanako3@lavabit.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
When a branch moves A to B while the other branch created B (or moved C to
B), the code tried to rename one of them to B~something to preserve both
versions, and failed to register temporary resolution for the original
path B at stage#0 during virtual ancestor computation. This left the
index in unmerged state and caused a segfault.
A better solution is to merge these two versions of B's in place and use
the (potentially conflicting) result as the intermediate merge result in
the virtual ancestor.
Signed-off-by: Junio C Hamano <gitster@pobox.com>
* tr/die_errno:
Use die_errno() instead of die() when checking syscalls
Convert existing die(..., strerror(errno)) to die_errno()
die_errno(): double % in strerror() output just in case
Introduce die_errno() that appends strerror(errno) to die()
Put filenames into the conflict markers only when they are different.
Otherwise they are redundant information clutter.
Print the filename explicitely when warning about a binary conflict.
Signed-off-by: Martin Renold <martinxyz@gmx.ch>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Change calls to die(..., strerror(errno)) to use the new die_errno().
In the process, also make slight style adjustments: at least state
_something_ about the function that failed (instead of just printing
the pathname), and put paths in single quotes.
Signed-off-by: Thomas Rast <trast@student.ethz.ch>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
There are a few remaining ones, but this fixes the trivial ones. It boils
down to two main issues that sparse complains about:
- warning: Using plain integer as NULL pointer
Sparse doesn't like you using '0' instead of 'NULL'. For various good
reasons, not the least of which is just the visual confusion. A NULL
pointer is not an integer, and that whole "0 works as NULL" is a
historical accident and not very pretty.
A few of these remain: zlib is a total mess, and Z_NULL is just a 0.
I didn't touch those.
- warning: symbol 'xyz' was not declared. Should it be static?
Sparse wants to see declarations for any functions you export. A lack
of a declaration tends to mean that you should either add one, or you
should mark the function 'static' to show that it's in file scope.
A few of these remain: I only did the ones that should obviously just
be made static.
That 'wt_status_submodule_summary' one is debatable. It has a few related
flags (like 'wt_status_use_color') which _are_ declared, and are used by
builtin-commit.c. So maybe we'd like to export it at some point, but it's
not declared now, and not used outside of that file, so 'static' it is in
this patch.
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
When you are trying to come up with the final result (i.e. depth=0), you
want to record how the conflict arose by registering the state of the
common ancestor, your branch and the other branch in the index, hence you
want to do update_stages().
When you are merging with positive depth, that is because of a criss-cross
merge situation. In such a case, you would need to record the tentative
result, with conflict markers and all, as if the merge went cleanly, even
if there are conflicts, in order to write it out as a tree object later to
be used as a common ancestor tree.
update_file() calls update_file_flags() with update_cache=1 to signal that
the result needs to be written to the index at stage #0 (i.e. merged), and
the code should not clobber the index further by calling update_stages().
The codepath to deal with rename/delete conflict in a recursive merge
however left the index unmerged.
Signed-off-by: Dave Olszewski <cxreg@pobox.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
We cannot represent the 3-way conflicted state in the work tree
for these entries, but it is normal not to have commit objects
for them in our repository. Just update the index and the life
will be good.
Signed-off-by: Junio C Hamano <gitster@pobox.com>
* cb/maint-merge-recursive-submodule-fix:
simplify output of conflicting merge
update cache for conflicting submodule entries
add tests for merging with submodules
This simplifies the code without changing the semantics and removes
the unhelpful "needs $sha1" part of the conflicting submodule message.
Signed-off-by: Clemens Buchacher <drizzd@aon.at>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
When merging merge bases during a recursive merge we do not want to
leave any unmerged entries. Otherwise we cannot create a temporary
tree for the recursive merge to work with.
We failed to do so in case of a submodule conflict between merge
bases, causing a NULL pointer dereference in the next step of the
recursive merge.
Signed-off-by: Clemens Buchacher <drizzd@aon.at>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
http-push.c::finish_request():
request is initialized by the for loop
index-pack.c::free_base_data():
b is initialized by the for loop
merge-recursive.c::process_renames():
move compare to narrower scope, and remove unused assignments to it
remove unused variable renames2
xdiff/xdiffi.c::xdl_recs_cmp():
remove unused variable ec
xdiff/xemit.c::xdl_emit_diff():
xche is always overwritten
Signed-off-by: Benjamin Kramer <benny.kra@googlemail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
When the callback function invoked from read_tree_recursive() returns
the value `READ_TREE_RECURSIVE` for a gitlink entry, the traversal will
now continue into the tree connected to the gitlinked commit. This
functionality can be used to allow inter-repository operations, but
since the current users of read_tree_recursive() does not yet support
such operations, they have been modified where necessary to make sure
that they never return READ_TREE_RECURSIVE for gitlink entries (hence
no change in behaviour should be introduces by this patch alone).
Signed-off-by: Lars Hjemli <hjemli@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
* cb/maint-merge-recursive-fix:
merge-recursive: do not clobber untracked working tree garbage
modify/delete conflict resolution overwrites untracked file
Conflicts:
builtin-merge-recursive.c
When a file was renamed in one branch, but deleted in the other, one
should expect the index to contain an unmerged entry, namely the
target of the rename. Make it so.
Noticed by Constantine Plotnikov.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
* cb/maint-merge-recursive-fix:
merge-recursive: do not clobber untracked working tree garbage
modify/delete conflict resolution overwrites untracked file
This was originally implemented in c236bcd061
but was lost to a mismerge in 9ba929ed65.
Signed-off-by: Matt McCutchen <matt@mattmccutchen.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Many call sites use strbuf_init(&foo, 0) to initialize local
strbuf variable "foo" which has not been accessed since its
declaration. These can be replaced with a static initialization
using the STRBUF_INIT macro which is just as readable, saves a
function call, and takes up fewer lines.
Signed-off-by: Brandon Casey <casey@nrlssc.navy.mil>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
* bc/master-diff-hunk-header-fix:
Clarify commit error message for unmerged files
Use strchrnul() instead of strchr() plus manual workaround
Use remove_path from dir.c instead of own implementation
Add remove_path: a function to remove as much as possible of a path
git-submodule: Fix "Unable to checkout" for the initial 'update'
Clarify how the user can satisfy stash's 'dirty state' check.
t4018-diff-funcname: test syntax of builtin xfuncname patterns
t4018-diff-funcname: test syntax of builtin xfuncname patterns
make "git remote" report multiple URLs
diff hunk pattern: fix misconverted "\{" tex macro introducers
diff: fix "multiple regexp" semantics to find hunk header comment
diff: use extended regexp to find hunk headers
diff: use extended regexp to find hunk headers
diff.*.xfuncname which uses "extended" regex's for hunk header selection
diff.c: associate a flag with each pattern and use it for compiling regex
diff.c: return pattern entry pointer rather than just the hunk header pattern
Conflicts:
builtin-merge-recursive.c
t/t7201-co.sh
xdiff-interface.h
* maint:
Remove empty directories in recursive merge
Documentation: clarify the details of overriding LESS via core.pager
Conflicts:
builtin-merge-recursive.c
We now just leave the object->sha1 field of virtual commits 0{40} as it
is initialized, as a unique hash is not necessary in case of virtual
commits.
Signed-off-by: Miklos Vajna <vmiklos@frugalware.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
struct merge_options already has a call_depth member, and index_only
global variable always equals to !!call_depth.
We always use index_only as a condition, so we can just
use call_depth instead of index_only.
Signed-off-by: Miklos Vajna <vmiklos@frugalware.org>
This makes it possible to avoid passing the labels of branches as
arguments to merge_recursive(), merge_trees() and
merge_recursive_generic().
It also takes care of subtree merge, output buffering, verbosity, and
rename limits - these were global variables till now in
merge-recursive.c.
A new function, named init_merge_options(), is introduced as well, it
clears the struct merge_info, then initializes with default values,
finally updates the default values based on the config and environment
variables.
Signed-off-by: Miklos Vajna <vmiklos@frugalware.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
merge_recursive_generic() takes, in comparison to to merge_recursive(),
no commit ("struct commit *") arguments but SHA ids ("unsigned char *"),
and no commit list of bases but an array of refs ("const char **").
This makes it more generic in the case that it can also take the SHA
of a tree to merge trees without commits, for the bases, the head
and the remote.
merge_recursive_generic() also handles locking and updating of the
index, which is a common use case of merge_recursive().
This patch also rewrites builtin-merge-recursive.c to make use of
merge_recursive_generic(). By doing this, I stumbled over the
limitation of 20 bases and I've added a warning if this limitation
is exceeded.
This patch qualifies make_virtual_commit() as static again because
this function is not needed anymore outside merge-recursive.c.
Signed-off-by: Stephan Beyer <s-beyer@gmx.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Move most of the of code from builtin-merge-recursive.c to a new file
merge-recursive.c and introduce merge_recursive_setup() in there so that
builtin-merge-recursive and other builtins call it.
Signed-off-by: Miklos Vajna <vmiklos@frugalware.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This makes write_tree_from_memory(), which writes the active cache as
a tree and returns the struct tree for it, available to other code. It
also makes available merge_trees(), which does the internal merge of
two trees with a known base, and merge_recursive(), which does the
recursive internal merge of two commits with a list of common
ancestors.
The first two of these will be used by checkout -m, and the third is
presumably useful in general, although the implementation of checkout
-m which entirely matches the behavior of the shell version does not
use it (since it ignores the difference of ancestry between the old
branch and the new branch).
Signed-off-by: Daniel Barkalow <barkalow@iabervon.org>
This converts the index explicitly on read and write to its on-disk
format, allowing the in-core format to contain more flags, and be
simpler.
In particular, the in-core format is now host-endian (as opposed to the
on-disk one that is network endian in order to be able to be shared
across machines) and as a result we can dispense with all the
htonl/ntohl on accesses to the cache_entry fields.
This will make it easier to make use of various temporary flags that do
not exist in the on-disk format.
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
When merging conflicting submodule changes from a supermodule, generate
a conflict message saying what went wrong. Also leave the tree in a state
where git status shows the conflict, and git submodule status gives the user
enough information to do the merge manally. Previously this would just fail.
Signed-off-by: Finn Arne Gangstad <finnag@pvv.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
merge-recursive did not support merging trees that have conflicting
changes in submodules they contain, and died. Support it exactly the
same way as how it handles conflicting symbolic link changes --- mark it
as a conflict, take the tentative result from the current side, and
letting the caller resolve the conflict, without dying in merge_file()
function.
Also reword the error message issued when merge_file() has to die
because it sees a tree entry of type it does not support yet.
[jc: fixed up initial draft by Finn Arne Gangstad]
Signed-off-by: Junio C Hamano <gitster@pobox.com>
reverse_diff was a bit-value in disguise, it's merged in the flags now.
Signed-off-by: Pierre Habouzit <madcoder@debian.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
* maint:
RelNotes-1.5.3.5: describe recent fixes
merge-recursive.c: mrtree in merge() is not used before set
sha1_file.c: avoid gcc signed overflow warnings
Fix a small memory leak in builtin-add
honor the http.sslVerify option in shell scripts
The called function merge_trees() sets its *result, to which the
address of the variable mrtree in merge() function is passed,
only when index_only is set. But that is Ok as the function
uses the value in the variable only under index_only iteration.
However, recent gcc does not realize this. Work it around by
adding a fake initializer.
Signed-off-by: Junio C Hamano <gitster@pobox.com>
* ph/strbuf: (44 commits)
Make read_patch_file work on a strbuf.
strbuf_read_file enhancement, and use it.
strbuf change: be sure ->buf is never ever NULL.
double free in builtin-update-index.c
Clean up stripspace a bit, use strbuf even more.
Add strbuf_read_file().
rerere: Fix use of an empty strbuf.buf
Small cache_tree_write refactor.
Make builtin-rerere use of strbuf nicer and more efficient.
Add strbuf_cmp.
strbuf_setlen(): do not barf on setting length of an empty buffer to 0
sq_quote_argv and add_to_string rework with strbuf's.
Full rework of quote_c_style and write_name_quoted.
Rework unquote_c_style to work on a strbuf.
strbuf API additions and enhancements.
nfv?asprintf are broken without va_copy, workaround them.
Fix the expansion pattern of the pseudo-static path buffer.
builtin-for-each-ref.c::copy_name() - do not overstep the buffer.
builtin-apply.c: fix a tiny leak introduced during xmemdupz() conversion.
Use xmemdupz() in many places.
...
The function make_cache_entry() is too useful to be hidden away in
merge-recursive. So move it to libgit.a (exposing it via cache.h).
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
It might be a sign of source code management gone bad, but when two branches
has diverged almost beyond recognition and time has come for the branches to
merge, the user is going to need all the help his tool can give him. Honoring
diff.renamelimit has great potential as a painkiller in such situations.
The painkiller effect could have been achieved by e.g. 'merge.renamelimit',
but the flexibility gained by a separate option is questionable: our user
would probably expect git to detect renames equally good when merging as
when diffing (I known I did).
Signed-off-by: Lars Hjemli <hjemli@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
* drop nfasprintf.
* move nfvasprintf into imap-send.c back, and let it work on a 8k buffer,
and die() in case of overflow. It should be enough for imap commands, if
someone cares about imap-send, he's welcomed to fix it properly.
* replace nfvasprintf use in merge-recursive with a copy of the strbuf_addf
logic, it's one place, we'll live with it.
To ease the change, output_buffer string list is replaced with a strbuf ;)
* rework trace.c to call vsnprintf itself. It's used to format strerror()s
and git command names, it should never be more than a few octets long, let
it work on a 8k static buffer with vsnprintf or die loudly.
Signed-off-by: Pierre Habouzit <madcoder@debian.org>
The function make_cache_entry() is too useful to be hidden away in
merge-recursive. So move it to libgit.a (exposing it via cache.h).
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
xmkstemp() performs error checking and prints a standard error message when
an error occur.
Signed-off-by: Luiz Fernando N. Capitulino <lcapitulino@mandriva.com.br>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
When you try to merge a path that involves binary file-level
merge, merge-recursive died rudely without cleaning up its own
mess. A files added by the merge were left in the working tree,
but the index was not written out (because it just punted and
died), so it was cumbersome for the user to retry it by first
running "git reset --hard".
This changes merge-recursive to still warn but do the "binary"
merge for such a path; leave the "our" version in the working
tree, but still keep the path unmerged so that the user can sort
it out.
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This doesn't actually change any real code, but it changes the interface
to unpack_trees() to take an array of "struct tree_desc" entries, the same
way the tree-walk.c functions do.
The reason for this is that we would be much better off if we can do the
tree-unpacking using the generic "traverse_trees()" functionality instead
of having to the special "unpack" infrastructure.
This really is a pretty minimal diff, just to change the calling
convention. It passes all the tests, and looks sane. There were only two
users of "unpack_trees()": builtin-read-tree and merge-recursive, and I
tried to keep the changes minimal.
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
as it is not relevant for whether the result should be written.
Even if no real merge happened, there might be _no_ reason to
rewrite the working tree file. Maybe even more so.
Signed-off-by: Alex Riesen <raa.lkml@gmail.com>
Signed-off-by: Junio C Hamano <junkio@cox.net>
Also leave a warning for future merge-recursive explorers.
Signed-off-by: Alex Riesen <raa.lkml@gmail.com>
Signed-off-by: Junio C Hamano <junkio@cox.net>
If a file is changed in one branch, and renamed and changed to the
same content in another branch than we can skip the rewrite of this
file in the working directory, as the content does not change.
Signed-off-by: Alex Riesen <raa.lkml@gmail.com>
Signed-off-by: Junio C Hamano <junkio@cox.net>
* 'jc/attr': (28 commits)
lockfile: record the primary process.
convert.c: restructure the attribute checking part.
Fix bogus linked-list management for user defined merge drivers.
Simplify calling of CR/LF conversion routines
Document gitattributes(5)
Update 'crlf' attribute semantics.
Documentation: support manual section (5) - file formats.
Simplify code to find recursive merge driver.
Counto-fix in merge-recursive
Fix funny types used in attribute value representation
Allow low-level driver to specify different behaviour during internal merge.
Custom low-level merge driver: change the configuration scheme.
Allow the default low-level merge driver to be configured.
Custom low-level merge driver support.
Add a demonstration/test of customized merge.
Allow specifying specialized merge-backend per path.
merge-recursive: separate out xdl_merge() interface.
Allow more than true/false to attributes.
Document git-check-attr
Change attribute negation marker from '!' to '-'.
...
The mess known as the progress meter in merge-recursive was my own
fault; I put it in thinking that we might be spending a lot of time
resolving unmerged entries in the index that were not handled by
the simple 3-way index merge code.
Turns out we don't really spend that much time there, so the progress
meter was pretty much always jumping to "(n/n) 100%" as soon as
the program started. That isn't a very good indication of progress.
Since I don't have a great solution for how a progress meter should
work here, I'm proposing we back it out entirely.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>
Alex Riesen noticed that the case where a file replaced a directory entry
in the working tree was broken on cygwin. It turns out that the code made
some Linux-specific assumptions, and also ignored errors entirely for the
case where the entry was a symlink rather than a file.
This cleans it up by separating out the common case into a function of its
own, so that both regular files and symlinks can share it, and by making
the error handling more obvious (and not depend on any Linux-specific
behaviour).
Acked-by: Alex Riesen <raa.lkml@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>
There is no need to intern the string to git_attr, as we are already
dealing with the name of the driver there.
Signed-off-by: Junio C Hamano <junkio@cox.net>
When the configuration has variables unrelated to low-level
merge drivers (e.g. merge.summary), the code failed to ignore
them but did something totally senseless.
Signed-off-by: Junio C Hamano <junkio@cox.net>
It was bothering me a lot that I abused small integer values
casted to (void *) to represent non string values in
gitattributes. This corrects it by making the type of attribute
values (const char *), and using the address of a few statically
allocated character buffer to denote true/false. Unset attributes
are represented as having NULLs as their values.
Added in-header documentation to explain how git_checkattr()
routine should be called.
Signed-off-by: Junio C Hamano <junkio@cox.net>
This allows [merge "drivername"] to have a variable "recursive"
that names a different low-level merge driver to be used when
merging common ancestors to come up with a virtual ancestor.
Signed-off-by: Junio C Hamano <junkio@cox.net>
This changes the configuration syntax for defining a low-level
merge driver to be:
[merge "<<drivername>>"]
driver = "<<command line>>"
name = "<<driver description>>"
which is much nicer to read and is extensible. Credit goes to
Martin Waitz and Linus.
In addition, when we use an external low-level merge driver, it
is reported as an extra output from merge-recursive, using the
value of merge.<<drivername>.name variable.
The demonstration in t6026 has also been updated.
Signed-off-by: Junio C Hamano <junkio@cox.net>
When no 'merge' attribute is given to a path, merge-recursive
uses the built-in xdl-merge as the low-level merge driver.
A new configuration item 'merge.default' can name a low-level
merge driver of user's choice to be used instead.
Signed-off-by: Junio C Hamano <junkio@cox.net>
This allows users to specify custom low-level merge driver per
path, using the attributes mechanism. Just like you can specify
one of built-in "text", "binary", "union" low-level merge
drivers by saying:
* merge=text
.gitignore merge=union
*.jpg merge=binary
pick a name of your favorite merge driver, and assign it as the
value of the 'merge' attribute.
A custom low-level merge driver is defined via the config
mechanism. This patch introduces 'merge.driver', a multi-valued
configuration. Its value is the name (i.e. the one you use as
the value of 'merge' attribute) followed by a command line
specification. The command line can contain %O, %A, and %B to
be interpolated with the names of temporary files that hold the
common ancestor version, the version from your branch, and the
version from the other branch, and the resulting command is
spawned.
The low-level merge driver is expected to update the temporary
file for your branch (i.e. %A) with the result and exit with
status 0 for a clean merge, and non-zero status for a conflicted
merge.
A new test in t6026 demonstrates a sample usage.
Signed-off-by: Junio C Hamano <junkio@cox.net>
This allows 'merge' attribute to control how the file-level
three-way merge is done per path.
- If you set 'merge' to true, leave it unspecified, or set it
to "text", we use the built-in 3-way xdl-merge.
- If you set 'merge' to false, or set it to "binary, the
"binary" merge is done. The merge result is the blob from
'our' tree, but this still leaves the path conflicted, so
that the mess can be sorted out by the user. This is
obviously meant to be useful for binary files.
- 'merge=union' (this is the first example of a string valued
attribute, introduced in the previous one) uses the "union"
merge. The "union" merge takes lines in conflicted hunks
from both sides, which is useful for line-oriented files such
as .gitignore.
Instead fo setting merge to 'true' or 'false' by using 'merge'
or '-merge', setting it explicitly to "text" or "binary" will
become useful once we start allowing custom per-path backends to
be added, and allow them to be activated for the default
(i.e. 'merge' attribute specified to 'true' or 'false') case,
using some other mechanisms. Setting merge attribute to "text"
or "binary" will be a way to explicitly request to override such
a custom default for selected paths.
Currently there is no way to specify random programs but it
should be trivial for motivated contributors to add later.
There is one caveat, though. ll_merge() is called for both
internal ancestor merge and the outer "final" merge. I think an
interactive custom per-path merge backend should refrain from
going interactive when performing an internal merge (you can
tell it by checking call_depth) and instead just call either
ll_xdl_merge() if the content is text, or call ll_binary_merge()
otherwise.
Signed-off-by: Junio C Hamano <junkio@cox.net>
When a path D that originally was blob in the ancestor was
modified on our branch while it was removed on the other branch,
we keep stages 1 and 2, and leave our version in the working
tree. If the other branch created a path D/F, however, that
path can cleanly be resolved in the index (after all, the
ancestor nor we do not have it and only the other side added),
but it cannot be checked out. The issue is the same when the
other branch had D and we had renamed it to D/F, or the ancestor
had D/F instead of D (so there are four combinations).
Do not stop the merge, but leave both D and D/F paths in the
index so that the user can clear things up.
Signed-off-by: Junio C Hamano <junkio@cox.net>
When update-trees::threeway_merge() decides that a path that
exists in the current index (and HEAD) is to be removed, it
leaves a stage 0 entry whose mode bits are set to 0. The code
mistook it as "this stage wants the blob here", and proceeded
to call update_file_flags() which ended up trying to put the
mode=0 entry in the index, got very confused, and ended up
barfing with "do not know what to do with 000000".
Since threeway_merge() does not handle case #10 (one side
removes while the other side does not do anything), this is not
a problem while we refuse to merge branches that have D/F
conflicts, but when we start resolving them, we would need to be
able to remove cache entries, and at that point it starts to
matter.
Signed-off-by: Junio C Hamano <junkio@cox.net>
This merge strategy largely piggy-backs on git-merge-recursive.
When merging trees A and B, if B corresponds to a subtree of A,
B is first adjusted to match the tree structure of A, instead of
reading the trees at the same level. This adjustment is also
done to the common ancestor tree.
If you are pulling updates from git-gui repository into git.git
repository, the root level of the former corresponds to git-gui/
subdirectory of the latter. The tree object of git-gui's toplevel
is wrapped in a fake tree object, whose sole entry has name 'git-gui'
and records object name of the true tree, before being used by
the 3-way merge code.
If you are merging the other way, only the git-gui/ subtree of
git.git is extracted and merged into git-gui's toplevel.
The detection of corresponding subtree is done by comparing the
pathnames and types in the toplevel of the tree.
Heuristics galore! That's the git way ;-).
Signed-off-by: Junio C Hamano <junkio@cox.net>
* jc/index-output:
git-read-tree --index-output=<file>
_GIT_INDEX_OUTPUT: allow plumbing to output to an alternative index file.
Conflicts:
builtin-apply.c
This error message should not usually trigger, but the function
make_cache_entry() called by add_cacheinfo() can return early
without calling into refresh_cache_entry() that sets cache_errno.
Also the error message had a wrong function name reported, and
it did not say anything about which path failed either.
Signed-off-by: Junio C Hamano <junkio@cox.net>
When defined, this allows plumbing commands that update the
index (add, apply, checkout-index, merge-recursive, mv,
read-tree, rm, update-index, and write-tree) to write their
resulting index to an alternative index file while holding a
lock to the original index file. With this, git-commit that
jumps the index does not have to make an extra copy of the index
file, and more importantly, it can do the update while holding
the lock on the index.
However, I think the interface to let an environment variable
specify the output is a mistake, as shown in the documentation.
If a curious user has the environment variable set to something
other than the file GIT_INDEX_FILE points at, almost everything
will break. This should instead be a command line parameter to
tell these plumbing commands to write the result in the named
file, to prevent stupid mistakes.
Signed-off-by: Junio C Hamano <junkio@cox.net>
This patch leaves the base name in the resulting intermediate tree, to
propagate the conflict from intermediate merges up to the top-level merge.
Signed-off-by: Alex Riesen <raa.lkml@gmail.com>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>
If the file system does not support symbolic links (core.symlinks=false),
merge-recursive must write the merged symbolic link text into a regular
file.
While we are here, fix a tiny memory leak in the if-branch that writes
real symbolic links.
Signed-off-by: Johannes Sixt <johannes.sixt@telecom.at>
Signed-off-by: Junio C Hamano <junkio@cox.net>
We currently have two parallel notation for dealing with object types
in the code: a string and a numerical value. One of them is obviously
redundent, and the most used one requires more stack space and a bunch
of strcmp() all over the place.
This is an initial step for the removal of the version using a char array
found in object reading code paths. The patch is unfortunately large but
there is no sane way to split it in smaller parts without breaking the
system.
Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>
Commit 3af244ca added unlink(2) before running symlink(2) to
update the working tree with the merge result, but it was
unlinking a wrong path. This resulted in loss of the path
pointed by a symlink.
Signed-off-by: Junio C Hamano <junkio@cox.net>
git-merge-recursive wants an null tree as the fake merge base
while producing the merge result tree. The null tree does not
have to be written out in the object store as it won't be part
of the result, and it is a prime example for using the new
pretend_sha1_file() function.
git-blame needs to register an arbitrary data to in-core index
while annotating a working tree file (or standard input), but
git-blame is a read-only application and the user of it could
even lack the privilege to write into the object store; it is
another good example for pretend_sha1_file().
Signed-off-by: Junio C Hamano <junkio@cox.net>
My earlier fix (8371234e) to delete renamed tracked files from the
working directory also caused merge-recursive to delete untracked
files that were in the working directory.
The problem here is merge-recursive is deleting the working directory
file without regard for which branch it was associated with. What we
really want to do during a merge is to only delete files that were
renamed by the branch we are merging into the current branch,
and that are still tracked by the current branch. These files
definitely don't belong in the working directory anymore.
Anything else is either a merge conflict (already handled in other
parts of the code) or a file that is untracked by the current branch
and thus is not even participating in the merge. Its this latter
class that must be left alone.
For this fix to work we are now assuming that the first non-base
argument passed to git-merge-recursive always corresponds to the
working directory. This is already true for all in-tree callers
of merge-recursive. This assumption is also supported by the
long time usage message of "<base> ... -- <head> <remote>", where
"<head>" is implied to be HEAD, which is generally assumed to be
the current tree-ish.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>
Now that we are showing the output messages for verbosity levels
<5 after all actions have been performed (due to the progress meter
running during the actions) it can be confusing to see messages in
the present tense when the user is looking at a '100% done' message
right above them. Converting the messages to past tense will appear
more correct in this case, and shouldn't affect a developer who is
debugging the application and running it at a verbosity level >=5.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>
Because large merges on slow systems can take up to a minute to
execute we should try to keep the user entertained with a progress
meter to let them know how far we have progressed through the
current merge.
The progress meter considers each entry in the in-memory index to
be a unit, which means a single recursive merge will double the
number of units in the progress meter. Files which are unmerged
after the 3-way tree merge are also considered a unit within the
progress meter.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>
Buffering all message output until a merge invocation is complete is
necessary to prevent intereferring with a progress meter that would
indicate the number of files completely merged, and how many remain.
This change does not introduce a progress meter, but merely lays
the groundwork to buffer the output.
To aid debugging output buffering is only enabled if verbosity
is lower than 5. When using verbosity levels above 5 the user is
probably debugging the merge program itself and does not want to
see the output delayed, especially if they are stepping through
portions of the code in a debugger.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>
Junio C Hamano <junkio@cox.net> writes:
>
> I think the output from merge-recursive can be categorized into 5
> verbosity levels:
>
> 1. "CONFLICT", "Rename", "Adding here instead due to D/F conflict"
> (outermost)
>
> 2. "Auto-merged successfully" (outermost)
>
> 3. The first "Merging X with Y".
>
> 4. outermost "Merging:\ntitle1\ntitle2".
>
> 5. outermost "found N common ancestors\nancestor1\nancestor2\n..."
> and anything from inner merge.
>
> I would prefer the default verbosity level to be 2 (that is, show
> both 1 and 2).
and this change makes it so. I think level 3 is probably pointless
as its only one line of output above level 2, but I can see how some
users may want to view it but not view the slightly more verbose
output of level 4.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>
Because the output_indent always matches the call_depth value
there is no reason to pass around the call_depth to the merge
function during each recursive invocation.
This is a simple refactoring that will make the code easier to
follow later on as I start to add output verbosity controls.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>
It is not available in the outermost merge, and it is only
useful for debugging merge-recursive in the inner merges.
Sergey Vlasov noticed that the old code accesses an
uninitialized location.
Signed-off-by: Junio C Hamano <junkio@cox.net>
This revamps the merge-recursive implementation following the
outline in:
Message-ID: <7v8xgileza.fsf@assigned-by-dhcp.cox.net>
There is no need to write out the index until the very end just
once from merge-recursive. Also there is no need to write out
the resulting tree object for the simple case of merging with a
single merge base.
Signed-off-by: Junio C Hamano <junkio@cox.net>
The merge-recursive implementation in C inherited the invariant
that the on-file index file is written out and later read back
after any index operations and writing trees from the original
Python implementation. But it was only because the original
implementation worked at the scripting level.
There is no need to write out the index file after handling
every path.
Signed-off-by: Alex Riesen <raa.lkml@gmail.com>
Signed-off-by: Junio C Hamano <junkio@cox.net>
We have a number of badly checked write() calls. Often we are
expecting write() to write exactly the size we requested or fail,
this fails to handle interrupts or short writes. Switch to using
the new write_in_full(). Otherwise we at a minimum need to check
for EINTR and EAGAIN, where this is appropriate use xwrite().
Note, the changes to config handling are much larger and handled
in the next patch in the sequence.
Signed-off-by: Andy Whitcroft <apw@shadowen.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>
To support wider use cases, such as from within `git am -3`, the
merge-recursive utility needs to accept not just commit-ish but
also tree-ish as arguments on its command line.
If given a tree-ish then merge-recursive will create a virtual commit
wrapping it, with the subject of the commit set to the best name we
can derive for that tree, which is either the command line string
(probably the SHA1), or whatever string appears in GITHEAD_*.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>
