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project: support reftable anchors in worktree .git migration

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The reftable backend creates real refs/ and reftable/ dirs. Update
_MigrateOldWorkTreeGitDir to expect these dirs and remove them.

Bug: 476209856
Change-Id: I4700da70cb466e25ecbc51ba4de9a906b8716bd8
Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/550761
Reviewed-by: Mike Frysinger <vapier@google.com>
Tested-by: Gavin Mak <gavinmak@google.com>
Commit-Queue: Gavin Mak <gavinmak@google.com>
This commit is contained in:
Gavin Mak
2026-02-06 14:18:28 -08:00
committed by LUCI
parent f14c577fce
commit 403fedfeb5
2 changed files with 50 additions and 4 deletions
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project.py
+28 -4
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@@ -3632,14 +3632,20 @@ class Project:
here. The path updates will happen independently.
"""
# Figure out where in .repo/projects/ it's pointing to.
if not os.path.islink(os.path.join(dotgit, "refs")):
gitdir = None
for name in ("refs", "reftable", "objects"):
path = os.path.join(dotgit, name)
if os.path.islink(path):
gitdir = os.path.dirname(os.path.realpath(path))
break
else:
raise GitError(
f"{dotgit}: unsupported checkout state", project=project
)
gitdir = os.path.dirname(os.path.realpath(os.path.join(dotgit, "refs")))
# Remove known symlink paths that exist in .repo/projects/.
KNOWN_LINKS = {
# go/keep-sorted start
"config",
"description",
"hooks",
@@ -3648,9 +3654,11 @@ class Project:
"objects",
"packed-refs",
"refs",
"reftable",
"rr-cache",
"shallow",
"svn",
# go/keep-sorted end
}
# Paths that we know will be in both, but are safe to clobber in
# .repo/projects/.
@@ -3675,7 +3683,16 @@ class Project:
dotgit_path = os.path.join(dotgit, name)
if name in KNOWN_LINKS:
if not platform_utils.islink(dotgit_path):
unknown_paths.append(f"{dotgit_path}: should be a symlink")
# In reftable format, refs and reftable can be directories.
if name in ("refs", "reftable") and platform_utils.isdir(
dotgit_path
):
pass
else:
unknown_paths.append(
f"{dotgit_path}: should be a symlink"
)
else:
gitdir_path = os.path.join(gitdir, name)
if name not in SAFE_TO_CLOBBER and os.path.exists(gitdir_path):
@@ -3697,7 +3714,14 @@ class Project:
if name.endswith("~") or (name[0] == "#" and name[-1] == "#"):
platform_utils.remove(dotgit_path)
elif name in KNOWN_LINKS:
platform_utils.remove(dotgit_path)
if (
name in ("refs", "reftable")
and platform_utils.isdir(dotgit_path)
and not platform_utils.islink(dotgit_path)
):
platform_utils.rmtree(dotgit_path)
else:
platform_utils.remove(dotgit_path)
else:
gitdir_path = os.path.join(gitdir, name)
platform_utils.remove(gitdir_path, missing_ok=True)