Dear Git developers,
Reporting Issue:
'git sparse-checkout add' hangs if local repo is using alternative
objects store
Found in:
Git 2.37.0
Reproduction steps:
1. Local repo setup:
git init
git remote add origin <repo_url>
echo <alternative_objects_store> >! .git/objects/info/alternates
git config --unset-all remote.origin.fetch
git config --unset-all remote.origin.tagopt
git config --add remote.origin.tagopt --no-tags
git config --add remote.origin.fetch
+refs/heads/main:refs/remotes/origin/main
git config core.sparsecheckout true
git config core.sparsecheckoutcone true
git fetch
2. Sparse checkout <dir1>:
git sparse-checkout set <dir1>
git checkout -b tmp1 origin/main
3. Add another <dir2> via sparse-checkout, which hangs:
git sparse-checkout add <dir2>
09:39:11.169116 read-cache.c:2451 performance:
6.326754679 s: read cache .git/index
09:39:11.731989 unpack-trees.c:496 performance:
0.197235658 s: check_updates
09:39:11.732031 unpack-trees.c:2062 performance:
0.512473791 s: update_sparsity
09:39:17.162018 read-cache.c:3135 performance:
5.429975480 s: write index, changed mask = 2
09:39:17.637510 cache-tree.c:483 performance:
0.154317183 s: cache_tree_update
09:39:17.857204 cache-tree.c:483 performance:
0.019983088 s: cache_tree_update
Repo and dir info:
<repo_url> is a large repo, containing large number of directories
and 2 million files;
Local repo is using <alternative_objects_store>, which is working
by verifying: git count-objects -vH;
<dir1> used here is one level deep, <dir2> used here is 5 level deep
Observations:
1. Even 'sparse-checkout add' hangs, scm code from <dir2> was
actually downloaded pretty fast
2. If waited out 'sparse-checkout add', git seems start to
download large number of objects from alternative objects store into
local .git/objects
Please help us take a look at this issue and let us know if you need
more information.
Thanks,
Dian Xu
Mathworks, Inc
1 Lakeside Campus Drive, Natick, MA 01760
508-647-3583
