@@ -91,3 +91,11 @@ submodule.alternateErrorStrategy::
`ignore`, `info`, `die`. Default is `die`. Note that if set to `ignore`
or `info`, and if there is an error with the computed alternate, the
clone proceeds as if no alternate was specified.
+
+submodule.superprojectGitDir::
+ If this repository is a submodule, the relative path from this repo's
+ gitdir to its superproject's gitdir. Git commands may rely on this
+ reference to determine whether the current repo is a submodule to
+ another repo; if this reference is absent, Git will treat the current
+ repo as though it is not a submodule (this does not make a difference to
+ most Git commands). It is set automatically during submodule creation.
@@ -1839,6 +1839,17 @@ static int clone_submodule(struct module_clone_data *clone_data)
git_config_set_in_file(p, "submodule.alternateErrorStrategy",
error_strategy);
+ /*
+ * Set the path from submodule's new gitdir to superproject's gitdir.
+ * The latter may be a worktree gitdir. However, it is not possible for
+ * the submodule to have a worktree-specific gitdir or config at clone
+ * time, because "extensions.worktreeConfig" is only valid when set in
+ * the local gitconfig, which the brand new submodule does not have yet.
+ */
+ git_config_set_in_file(p, "submodule.superprojectGitDir",
+ relative_path(absolute_path(get_git_dir()),
+ sm_gitdir, &sb));
+
free(sm_alternate);
free(error_strategy);
@@ -109,12 +109,24 @@ submodurl=$(pwd -P)
inspect() {
sub_dir=$1 &&
+ super_dir=$2 &&
git -C "$sub_dir" for-each-ref --format='%(refname)' 'refs/heads/*' >heads &&
{ git -C "$sub_dir" symbolic-ref HEAD || :; } >head &&
git -C "$sub_dir" rev-parse HEAD >head-sha1 &&
git -C "$sub_dir" update-index --refresh &&
git -C "$sub_dir" diff-files --exit-code &&
+
+ # Ensure that submodule.superprojectGitDir contains the path from the
+ # submodule's gitdir to the superproject's gitdir.
+
+ super_abs_gitdir=$(git -C "$super_dir" rev-parse --absolute-git-dir) &&
+ sub_abs_gitdir=$(git -C "$sub_dir" rev-parse --absolute-git-dir) &&
+
+ [ "$(git -C "$sub_dir" config --get submodule.superprojectGitDir)" = \
+ "$(test-tool path-utils relative_path "$super_abs_gitdir" \
+ "$sub_abs_gitdir")" ] &&
+
git -C "$sub_dir" clean -n -d -x >untracked
}
@@ -138,7 +150,7 @@ test_expect_success 'submodule add' '
) &&
rm -f heads head untracked &&
- inspect addtest/submod &&
+ inspect addtest/submod addtest &&
test_cmp expect heads &&
test_cmp expect head &&
test_must_be_empty untracked
@@ -240,7 +252,7 @@ test_expect_success 'submodule add --branch' '
) &&
rm -f heads head untracked &&
- inspect addtest/submod-branch &&
+ inspect addtest/submod-branch addtest &&
test_cmp expect-heads heads &&
test_cmp expect-head head &&
test_must_be_empty untracked
@@ -256,7 +268,7 @@ test_expect_success 'submodule add with ./ in path' '
) &&
rm -f heads head untracked &&
- inspect addtest/dotsubmod/frotz &&
+ inspect addtest/dotsubmod/frotz addtest &&
test_cmp expect heads &&
test_cmp expect head &&
test_must_be_empty untracked
@@ -272,7 +284,7 @@ test_expect_success 'submodule add with /././ in path' '
) &&
rm -f heads head untracked &&
- inspect addtest/dotslashdotsubmod/frotz &&
+ inspect addtest/dotslashdotsubmod/frotz addtest &&
test_cmp expect heads &&
test_cmp expect head &&
test_must_be_empty untracked
@@ -288,7 +300,7 @@ test_expect_success 'submodule add with // in path' '
) &&
rm -f heads head untracked &&
- inspect addtest/slashslashsubmod/frotz &&
+ inspect addtest/slashslashsubmod/frotz addtest &&
test_cmp expect heads &&
test_cmp expect head &&
test_must_be_empty untracked
@@ -304,7 +316,7 @@ test_expect_success 'submodule add with /.. in path' '
) &&
rm -f heads head untracked &&
- inspect addtest/realsubmod &&
+ inspect addtest/realsubmod addtest &&
test_cmp expect heads &&
test_cmp expect head &&
test_must_be_empty untracked
@@ -320,7 +332,7 @@ test_expect_success 'submodule add with ./, /.. and // in path' '
) &&
rm -f heads head untracked &&
- inspect addtest/realsubmod2 &&
+ inspect addtest/realsubmod2 addtest &&
test_cmp expect heads &&
test_cmp expect head &&
test_must_be_empty untracked
@@ -351,7 +363,7 @@ test_expect_success 'submodule add in subdirectory' '
) &&
rm -f heads head untracked &&
- inspect addtest/realsubmod3 &&
+ inspect addtest/realsubmod3 addtest &&
test_cmp expect heads &&
test_cmp expect head &&
test_must_be_empty untracked
@@ -492,7 +504,7 @@ test_expect_success 'update should work when path is an empty dir' '
git submodule update -q >update.out &&
test_must_be_empty update.out &&
- inspect init &&
+ inspect init . &&
test_cmp expect head-sha1
'
@@ -551,7 +563,7 @@ test_expect_success 'update should checkout rev1' '
echo "$rev1" >expect &&
git submodule update init &&
- inspect init &&
+ inspect init . &&
test_cmp expect head-sha1
'
Teach submodules a config variable referencing to their superproject's gitdir. Git commands can rely on this reference to determine whether the current repo is a submodule to another repo. If this reference is absent, Git may assume the current repo is not a submodule. In practice, some commands which specifically reference the submodule relationship, like 'git rev-parse --show-superproject-working-tree', will still search the parent directory. Other newly added or implicit behavior, such as "git status" showing the submodule's status in relation to the superproject, or a config which is shared between the superproject and the submodule, should not search the parent directory and instead rely on this "submodule.superprojectGitDir" config. By using a relative path instead of an absolute path, we can move the superproject directory around on the filesystem without breaking the submodule's pointer. And by using the path from gitdir to gitdir, we can move the submodule within the superproject's tree structure without breaking the submodule's pointer, too. Finally, by pointing at the superproject's worktree gitdir (if it exists), we ensure that we can tell which worktree contains our submodule. This commit teaches "git submodule add" to add the aformentioned config variable. Subsequent commits will teach other commands to do so. Signed-off-by: Emily Shaffer <emilyshaffer@google.com> Helped-by: Junio C Hamano <gitster@pobox.com> --- Documentation/config/submodule.txt | 8 ++++++++ builtin/submodule--helper.c | 11 ++++++++++ t/t7400-submodule-basic.sh | 32 ++++++++++++++++++++---------- 3 files changed, 41 insertions(+), 10 deletions(-)