Re: git repack on shallow clone of large repo (linux kernel) hangs at "Enumerating objects"

Hi Jeff,

You could try using strace or gdb to see what it's doing.

But as a guess, one thing that sometimes causes a stall near the end of
"enumerating objects" is loosening unreachable objects that are
currently packed. You told repack to use "-A", which asks to loosen
those objects so they aren't lost when the old packs are deleted (as
opposed to "-a").

I attached two strace logs, one for "git repack -A -d" and one for "git
repack -a -d".

For the former, I got following excerpt before I had to SIGINT the process:

stat("/opt/git/libexec/git-core/git", {st_mode=S_IFREG|0755, st_size=22096480, ...}) = 0
pipe([5, 7])                            = 0
openat(AT_FDCWD, "/dev/null", O_RDWR|O_CLOEXEC) = 8
fcntl(8, F_GETFD)                       = 0x1 (flags FD_CLOEXEC)
fcntl(8, F_SETFD, FD_CLOEXEC)           = 0
rt_sigprocmask(SIG_SETMASK, ~[RTMIN RT_1], [], 8) = 0
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x7feb5ecbfa10) = 13691
rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
close(7)                                = 0
read(5, "", 8)                          = 0
close(5)                                = 0
close(8)                                = 0
close(4)                                = 0
fcntl(3, F_GETFL)                       = 0 (flags O_RDONLY)
fstat(3, {st_mode=S_IFIFO|0600, st_size=0, ...}) = 0
read(3, 0x55a540de5250, 4096)           = ? ERESTARTSYS (To be restarted if SA_RESTART is set)

I thought that in the case of "git repack -A -d", it is stucked at the
last read() before I ctrl-c'ed to trigger SIGINT.

You'd probably want to at least say "--unpack-unreachable=some.time" to
avoid writing out ones which are not even recent (and which is what "git
gc" will do under the hood).

quoted

But if you don't care about keeping them at all (e.g., because this is

not an active repository where other simultaneous operations may be
taking place, so you know it is safe to delete even recent ones), then
just "git repack -a -d" is probably your best bet.

-Peff

Using "-a" instead of "-A" on git repack works. Thanks.

-- 
An old man doll... just what I always wanted! - Clara