setup: fix bug with "includeIf.onbranch" when initializing dir
It was reported that git-init(1) can fail when initializing an existing
directory in case the config contains an "includeIf.onbranch:"
condition:
$ mkdir repo
$ git -c includeIf.onbranch:main.path=nonexistent init repo
BUG: refs.c:2056: reference backend is unknown
The same error can also be triggered when re-initializing an already
existing repository.
The bug has been introduced in 173761e21b (setup: start tracking ref
storage format, 2023-12-29), which wired up the ref storage format. The
root cause is in `init_db()`, which tries to read the config before we
have initialized `the_repository` and most importantly its ref storage
format. We eventually end up calling `include_by_branch()` and execute
`refs_resolve_ref_unsafe()`, but because we have not initialized the ref
storage format yet this will trigger the above bug.
Interestingly, `include_by_branch()` has a mechanism that will only
cause us to resolve the ref when `the_repository->gitdir` is set. This
is also the reason why this only happens when we initialize an already
existing directory or repository: `gitdir` is set in those cases, but
not when creating a new directory.
Now there are two ways to address the issue:
- We can adapt `include_by_branch()` to also make the code conditional
on whether `the_repository->ref_storage_format` is set.
- We can shift around code such that we initialize the repository
format before we read the config.
While the first approach would be safe, it may also cause us to paper
over issues where a ref store should have been set up. In our case for
example, it may be reasonable to expect that re-initializing the repo
will cause the "onbranch:" condition to trigger, but we would not do
that if the ref storage format was not set up yet. This also used to
work before the above commit that introduced this bug.
Rearrange the code such that we set up the repository format before
reading the config. This fixes the bug and ensures that "onbranch:"
conditions can trigger.
Reported-by: Heghedus Razvan <heghedus.razvan@protonmail.com>
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Tested-by: Heghedus Razvan <heghedus.razvan@protonmail.com>
[jc: fixed a test and backported to v2.44.0 codebase]
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/t/t0001-init.sh b/t/t0001-init.sh
index b131d66..319ed81 100755
--- a/t/t0001-init.sh
+++ b/t/t0001-init.sh
@@ -584,14 +584,39 @@
test_cmp expect actual
'
-test_expect_success 're-init with same format' '
- test_when_finished "rm -rf refformat" &&
- git init --ref-format=files refformat &&
- git init --ref-format=files refformat &&
- echo files >expect &&
- git -C refformat rev-parse --show-ref-format >actual &&
- test_cmp expect actual
-'
+backends="files"
+for from_format in $backends
+do
+ test_expect_success "re-init with same format ($from_format)" '
+ test_when_finished "rm -rf refformat" &&
+ git init --ref-format=$from_format refformat &&
+ git init --ref-format=$from_format refformat &&
+ echo $from_format >expect &&
+ git -C refformat rev-parse --show-ref-format >actual &&
+ test_cmp expect actual
+ '
+
+ for to_format in $backends
+ do
+ if test "$from_format" = "$to_format"
+ then
+ continue
+ fi
+
+ test_expect_success "re-init with different format fails ($from_format -> $to_format)" '
+ test_when_finished "rm -rf refformat" &&
+ git init --ref-format=$from_format refformat &&
+ cat >expect <<-EOF &&
+ fatal: attempt to reinitialize repository with different reference storage format
+ EOF
+ test_must_fail git init --ref-format=$to_format refformat 2>err &&
+ test_cmp expect err &&
+ echo $from_format >expect &&
+ git -C refformat rev-parse --show-ref-format >actual &&
+ test_cmp expect actual
+ '
+ done
+done
test_expect_success 'init with --ref-format=garbage' '
test_when_finished "rm -rf refformat" &&
@@ -678,4 +703,64 @@
test_cmp expect actual
'
+test_expect_success 'init with includeIf.onbranch condition' '
+ test_when_finished "rm -rf repo" &&
+ git -c includeIf.onbranch:main.path=nonexistent init repo &&
+ echo $GIT_DEFAULT_REF_FORMAT >expect &&
+ git -C repo rev-parse --show-ref-format >actual &&
+ test_cmp expect actual
+'
+
+test_expect_success 'init with includeIf.onbranch condition with existing directory' '
+ test_when_finished "rm -rf repo" &&
+ mkdir repo &&
+ git -c includeIf.onbranch:nonexistent.path=/does/not/exist init repo &&
+ echo $GIT_DEFAULT_REF_FORMAT >expect &&
+ git -C repo rev-parse --show-ref-format >actual &&
+ test_cmp expect actual
+'
+
+test_expect_success 're-init with includeIf.onbranch condition' '
+ test_when_finished "rm -rf repo" &&
+ git init repo &&
+ git -c includeIf.onbranch:nonexistent.path=/does/not/exist init repo &&
+ echo $GIT_DEFAULT_REF_FORMAT >expect &&
+ git -C repo rev-parse --show-ref-format >actual &&
+ test_cmp expect actual
+'
+
+test_expect_success 're-init with includeIf.onbranch condition' '
+ test_when_finished "rm -rf repo" &&
+ git init repo &&
+ git -c includeIf.onbranch:nonexistent.path=/does/not/exist init repo &&
+ echo $GIT_DEFAULT_REF_FORMAT >expect &&
+ git -C repo rev-parse --show-ref-format >actual &&
+ test_cmp expect actual
+'
+
+test_expect_success 're-init skips non-matching includeIf.onbranch' '
+ test_when_finished "rm -rf repo config" &&
+ cat >config <<-EOF &&
+ [
+ garbage
+ EOF
+ git init repo &&
+ git -c includeIf.onbranch:nonexistent.path="$(test-tool path-utils absolute_path config)" init repo
+'
+
+test_expect_success 're-init reads matching includeIf.onbranch' '
+ test_when_finished "rm -rf repo config" &&
+ cat >config <<-EOF &&
+ [
+ garbage
+ EOF
+ path="$(test-tool path-utils absolute_path config)" &&
+ git init --initial-branch=branch repo &&
+ cat >expect <<-EOF &&
+ fatal: bad config line 1 in file $path
+ EOF
+ test_must_fail git -c includeIf.onbranch:branch.path="$path" init repo 2>err &&
+ test_cmp expect err
+'
+
test_done
