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stash: apply stash using 'merge_ort_nonrecursive()'

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Update 'stash' to use 'merge_ort_nonrecursive()' to apply a stash to the
current working tree. When 'git stash apply' was converted from its shell
script implementation to a builtin in 8a0fc8d19d (stash: convert apply to
builtin, 2019-02-25), 'merge_recursive_generic()' was used to merge a stash
into the working tree as part of 'git stash (apply|pop)'. However, with the
single merge base used in 'do_apply_stash()', the commit wrapping done by
'merge_recursive_generic()' is not only unnecessary, but misleading (the
*real* merge base is labeled "constructed merge base"). Therefore, a
non-recursive merge of the working tree, stashed tree, and stash base tree
is more appropriate.

There are two options for a non-recursive merge-then-update-worktree
function: 'merge_trees()' and 'merge_ort_nonrecursive()'. Use
'merge_ort_nonrecursive()' to align with the default merge strategy used by
'git merge' (6a5fb96672 (Change default merge backend from recursive to ort,
2021-08-04)) and, because merge-ort does not operate in-place on the index,
avoid unnecessary index expansion. Update tests in 't1092' verifying index
expansion for 'git stash' accordingly.

Signed-off-by: Victoria Dye <vdye@github.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Victoria Dye 2022-05-10 23:32:31 +00:00 committed by Junio C Hamano
parent 491df5f679
commit 874cf2a604
2 changed files with 26 additions and 8 deletions
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30
builtin/stash.c
View File

@ -7,6 +7,7 @@
#include "cache-tree.h"
#include "unpack-trees.h"
#include "merge-recursive.h"
#include "merge-ort-wrappers.h"
#include "strvec.h"
#include "run-command.h"
#include "dir.h"
@ -492,13 +493,13 @@ static void unstage_changes_unless_new(struct object_id *orig_tree)
static int do_apply_stash(const char *prefix, struct stash_info *info,
int index, int quiet)
{
int ret;
int clean, ret;
int has_index = index;
struct merge_options o;
struct object_id c_tree;
struct object_id index_tree;
struct commit *result;
const struct object_id *bases[1];
struct tree *head, *merge, *merge_base;
struct lock_file lock = LOCK_INIT;
read_cache_preload(NULL);
if (refresh_and_write_cache(REFRESH_QUIET, 0, 0))
@ -541,6 +542,7 @@ static int do_apply_stash(const char *prefix, struct stash_info *info,
o.branch1 = "Updated upstream";
o.branch2 = "Stashed changes";
o.ancestor = "Stash base";
if (oideq(&info->b_tree, &c_tree))
o.branch1 = "Version stash was based on";
@ -551,10 +553,26 @@ static int do_apply_stash(const char *prefix, struct stash_info *info,
if (o.verbosity >= 3)
printf_ln(_("Merging %s with %s"), o.branch1, o.branch2);
bases[0] = &info->b_tree;
head = lookup_tree(o.repo, &c_tree);
merge = lookup_tree(o.repo, &info->w_tree);
merge_base = lookup_tree(o.repo, &info->b_tree);
repo_hold_locked_index(o.repo, &lock, LOCK_DIE_ON_ERROR);
clean = merge_ort_nonrecursive(&o, head, merge, merge_base);
/*
* If 'clean' >= 0, reverse the value for 'ret' so 'ret' is 0 when the
* merge was clean, and nonzero if the merge was unclean or encountered
* an error.
*/
ret = clean >= 0 ? !clean : clean;
if (ret < 0)
rollback_lock_file(&lock);
else if (write_locked_index(o.repo->index, &lock,
COMMIT_LOCK | SKIP_IF_UNCHANGED))
ret = error(_("could not write index"));
ret = merge_recursive_generic(&o, &c_tree, &info->w_tree, 1, bases,
&result);
if (ret) {
rerere(0);

4
t/t1092-sparse-checkout-compatibility.sh
View File

@ -1385,7 +1385,7 @@ test_expect_success 'sparse-index is not expanded: stash' '
ensure_not_expanded stash &&
ensure_not_expanded stash list &&
ensure_not_expanded stash show stash@{0} &&
! ensure_not_expanded stash apply stash@{0} &&
ensure_not_expanded stash apply stash@{0} &&
ensure_not_expanded stash drop stash@{0} &&
echo >>sparse-index/deep/new &&
@ -1399,7 +1399,7 @@ test_expect_success 'sparse-index is not expanded: stash' '
oid=$(git -C sparse-index stash create) &&
ensure_not_expanded stash store -m "test" $oid &&
ensure_not_expanded reset --hard &&
! ensure_not_expanded stash pop
ensure_not_expanded stash pop
'
test_expect_success 'sparse index is not expanded: diff' '