Testcase:
# tell it where is other partition
OTHER_PARTITION=/path/to/other/partition/
# init repo
mkdir foo && cd foo && git init
# put some stuff and run gc to create packfile
cp /etc/fstab . && git add fstab && git commit -m "initial" && git gc
# move pack dir to other partition and install symlink
mv .git/objects/pack $OTHER_PARTITION && ln -s $OTHER_PARTITION/pack
.git/objects/pack
# run gc (it fails)
strace -f git gc 2>&1 | grep rename
[pid 3792] rename(".git/packed-refs.lock", ".git/packed-refs") = 0
[pid 3793] rename(".git/logs/refs/heads/master.lock",
".git/logs/refs/heads/master") = 0
[pid 3793] rename(".git/logs/HEAD.lock", ".git/logs/HEAD") = 0
[pid 3808] rename(".git/objects/pack/tmp_pack_8ZhS92",
"/home/marat/foo/.git/objects/.tmp-3795-pack-da13ceb9f70c2762595a7a2932411db339bdab46.pack")
= -1 EXDEV (Invalid cross-device link)
[pid 3808] write(2, "fatal: unable to rename temporar"..., 71fatal: unable
to rename temporary pack file: Invalid cross-device link
So you see, it tries to move packfile from .git/objects/pack to .git/objects
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