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submodule absorbing: fix worktree/gitdir pointers recursively for non-moves

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Consider having a submodule 'sub' and a nested submodule at 'sub/nested'.
When nested is already absorbed into sub, but sub is not absorbed into
its superproject, then we need to fixup the gitfile and core.worktree
setting for 'nested' when absorbing 'sub', but we do not need to move
its git dir around.

Previously 'nested's gitfile contained "gitdir: ../.git/modules/nested";
it has to be corrected to "gitdir: ../../.git/modules/sub1/modules/nested".

An alternative I considered to do this work lazily, i.e. when resolving
"../.git/modules/nested", we would notice the ".git" being a gitfile
linking to another path.  That seemed to be robuster by design, but harder
to get the implementation right.  Maybe we have to do that anyway once we
try to have submodules and worktrees working nicely together, but for now
just produce 'correct' (i.e. direct) pointers.

Signed-off-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Stefan Beller 2017-01-25 15:04:50 -08:00 committed by Junio C Hamano
parent 5f29433f1c
commit ec9629b3b9
2 changed files with 73 additions and 16 deletions
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58
submodule.c
View File

@ -1437,23 +1437,58 @@ void absorb_git_dir_into_superproject(const char *prefix,
const char *path,
unsigned flags)
{
const char *sub_git_dir, *v;
char *real_sub_git_dir = NULL, *real_common_git_dir = NULL;
int err_code;
const char *sub_git_dir;
struct strbuf gitdir = STRBUF_INIT;
strbuf_addf(&gitdir, "%s/.git", path);
sub_git_dir = resolve_gitdir(gitdir.buf);
sub_git_dir = resolve_gitdir_gently(gitdir.buf, &err_code);
/* Not populated? */
if (!sub_git_dir)
goto out;
if (!sub_git_dir) {
char *real_new_git_dir;
const char *new_git_dir;
const struct submodule *sub;
if (err_code == READ_GITFILE_ERR_STAT_FAILED) {
/* unpopulated as expected */
strbuf_release(&gitdir);
return;
}
if (err_code != READ_GITFILE_ERR_NOT_A_REPO)
/* We don't know what broke here. */
read_gitfile_error_die(err_code, path, NULL);
/*
* Maybe populated, but no git directory was found?
* This can happen if the superproject is a submodule
* itself and was just absorbed. The absorption of the
* superproject did not rewrite the git file links yet,
* fix it now.
*/
sub = submodule_from_path(null_sha1, path);
if (!sub)
die(_("could not lookup name for submodule '%s'"), path);
new_git_dir = git_path("modules/%s", sub->name);
if (safe_create_leading_directories_const(new_git_dir) < 0)
die(_("could not create directory '%s'"), new_git_dir);
real_new_git_dir = real_pathdup(new_git_dir);
connect_work_tree_and_git_dir(path, real_new_git_dir);
free(real_new_git_dir);
} else {
/* Is it already absorbed into the superprojects git dir? */
real_sub_git_dir = real_pathdup(sub_git_dir);
real_common_git_dir = real_pathdup(get_git_common_dir());
if (!skip_prefix(real_sub_git_dir, real_common_git_dir, &v))
char *real_sub_git_dir = real_pathdup(sub_git_dir);
char *real_common_git_dir = real_pathdup(get_git_common_dir());
if (!starts_with(real_sub_git_dir, real_common_git_dir))
relocate_single_git_dir_into_superproject(prefix, path);
free(real_sub_git_dir);
free(real_common_git_dir);
}
strbuf_release(&gitdir);
if (flags & ABSORB_GITDIR_RECURSE_SUBMODULES) {
struct child_process cp = CHILD_PROCESS_INIT;
struct strbuf sb = STRBUF_INIT;
@ -1478,9 +1513,4 @@ void absorb_git_dir_into_superproject(const char *prefix,
strbuf_release(&sb);
}
out:
strbuf_release(&gitdir);
free(real_sub_git_dir);
free(real_common_git_dir);
}

27
t/t7412-submodule-absorbgitdirs.sh
View File

@ -64,6 +64,33 @@ test_expect_success 'absorb the git dir in a nested submodule' '
test_cmp expect.2 actual.2
'
test_expect_success 're-setup nested submodule' '
# un-absorb the direct submodule, to test if the nested submodule
# is still correct (needs a rewrite of the gitfile only)
rm -rf sub1/.git &&
mv .git/modules/sub1 sub1/.git &&
GIT_WORK_TREE=. git -C sub1 config --unset core.worktree &&
# fixup the nested submodule
echo "gitdir: ../.git/modules/nested" >sub1/nested/.git &&
GIT_WORK_TREE=../../../nested git -C sub1/.git/modules/nested config \
core.worktree "../../../nested" &&
# make sure this re-setup is correct
git status --ignore-submodules=none
'
test_expect_success 'absorb the git dir in a nested submodule' '
git status >expect.1 &&
git -C sub1/nested rev-parse HEAD >expect.2 &&
git submodule absorbgitdirs &&
test -f sub1/.git &&
test -f sub1/nested/.git &&
test -d .git/modules/sub1/modules/nested &&
git status >actual.1 &&
git -C sub1/nested rev-parse HEAD >actual.2 &&
test_cmp expect.1 actual.1 &&
test_cmp expect.2 actual.2
'
test_expect_success 'setup a gitlink with missing .gitmodules entry' '
git init sub2 &&
test_commit -C sub2 first &&