1
0
Fork 0
mirror of https://github.com/git/git.git synced 2024-10-31 06:17:56 +01:00
git/git-repack.sh
Jeff King 7e52f5660e gc: do not explode objects which will be immediately pruned
When we pack everything into one big pack with "git repack
-Ad", any unreferenced objects in to-be-deleted packs are
exploded into loose objects, with the intent that they will
be examined and possibly cleaned up by the next run of "git
prune".

Since the exploded objects will receive the mtime of the
pack from which they come, if the source pack is old, those
loose objects will end up pruned immediately. In that case,
it is much more efficient to skip the exploding step
entirely for these objects.

This patch teaches pack-objects to receive the expiration
information and avoid writing these objects out. It also
teaches "git gc" to pass the value of gc.pruneexpire to
repack (which in turn learns to pass it along to
pack-objects) so that this optimization happens
automatically during "git gc" and "git gc --auto".

Signed-off-by: Jeff King <peff@peff.net>
Acked-by: Nicolas Pitre <nico@fluxnic.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2012-04-11 11:09:49 -07:00

194 lines
4.9 KiB
Bash
Executable file

#!/bin/sh
#
# Copyright (c) 2005 Linus Torvalds
#
OPTIONS_KEEPDASHDASH=
OPTIONS_SPEC="\
git repack [options]
--
a pack everything in a single pack
A same as -a, and turn unreachable objects loose
d remove redundant packs, and run git-prune-packed
f pass --no-reuse-delta to git-pack-objects
F pass --no-reuse-object to git-pack-objects
n do not run git-update-server-info
q,quiet be quiet
l pass --local to git-pack-objects
unpack-unreachable= with -A, do not loosen objects older than this
Packing constraints
window= size of the window used for delta compression
window-memory= same as the above, but limit memory size instead of entries count
depth= limits the maximum delta depth
max-pack-size= maximum size of each packfile
"
SUBDIRECTORY_OK='Yes'
. git-sh-setup
no_update_info= all_into_one= remove_redundant= unpack_unreachable=
local= no_reuse= extra=
while test $# != 0
do
case "$1" in
-n) no_update_info=t ;;
-a) all_into_one=t ;;
-A) all_into_one=t
unpack_unreachable=--unpack-unreachable ;;
--unpack-unreachable)
unpack_unreachable="--unpack-unreachable=$2"; shift ;;
-d) remove_redundant=t ;;
-q) GIT_QUIET=t ;;
-f) no_reuse=--no-reuse-delta ;;
-F) no_reuse=--no-reuse-object ;;
-l) local=--local ;;
--max-pack-size|--window|--window-memory|--depth)
extra="$extra $1=$2"; shift ;;
--) shift; break;;
*) usage ;;
esac
shift
done
case "`git config --bool repack.usedeltabaseoffset || echo true`" in
true)
extra="$extra --delta-base-offset" ;;
esac
PACKDIR="$GIT_OBJECT_DIRECTORY/pack"
PACKTMP="$PACKDIR/.tmp-$$-pack"
rm -f "$PACKTMP"-*
trap 'rm -f "$PACKTMP"-*' 0 1 2 3 15
# There will be more repacking strategies to come...
case ",$all_into_one," in
,,)
args='--unpacked --incremental'
;;
,t,)
args= existing=
if [ -d "$PACKDIR" ]; then
for e in `cd "$PACKDIR" && find . -type f -name '*.pack' \
| sed -e 's/^\.\///' -e 's/\.pack$//'`
do
if [ -e "$PACKDIR/$e.keep" ]; then
: keep
else
existing="$existing $e"
fi
done
if test -n "$existing" -a -n "$unpack_unreachable" -a \
-n "$remove_redundant"
then
# This may have arbitrary user arguments, so we
# have to protect it against whitespace splitting
# when it gets run as "pack-objects $args" later.
# Fortunately, we know it's an approxidate, so we
# can just use dots instead.
args="$args $(echo "$unpack_unreachable" | tr ' ' .)"
fi
fi
;;
esac
mkdir -p "$PACKDIR" || exit
args="$args $local ${GIT_QUIET:+-q} $no_reuse$extra"
names=$(git pack-objects --keep-true-parents --honor-pack-keep --non-empty --all --reflog $args </dev/null "$PACKTMP") ||
exit 1
if [ -z "$names" ]; then
say Nothing new to pack.
fi
# Ok we have prepared all new packfiles.
# First see if there are packs of the same name and if so
# if we can move them out of the way (this can happen if we
# repacked immediately after packing fully.
rollback=
failed=
for name in $names
do
for sfx in pack idx
do
file=pack-$name.$sfx
test -f "$PACKDIR/$file" || continue
rm -f "$PACKDIR/old-$file" &&
mv "$PACKDIR/$file" "$PACKDIR/old-$file" || {
failed=t
break
}
rollback="$rollback $file"
done
test -z "$failed" || break
done
# If renaming failed for any of them, roll the ones we have
# already renamed back to their original names.
if test -n "$failed"
then
rollback_failure=
for file in $rollback
do
mv "$PACKDIR/old-$file" "$PACKDIR/$file" ||
rollback_failure="$rollback_failure $file"
done
if test -n "$rollback_failure"
then
echo >&2 "WARNING: Some packs in use have been renamed by"
echo >&2 "WARNING: prefixing old- to their name, in order to"
echo >&2 "WARNING: replace them with the new version of the"
echo >&2 "WARNING: file. But the operation failed, and"
echo >&2 "WARNING: attempt to rename them back to their"
echo >&2 "WARNING: original names also failed."
echo >&2 "WARNING: Please rename them in $PACKDIR manually:"
for file in $rollback_failure
do
echo >&2 "WARNING: old-$file -> $file"
done
fi
exit 1
fi
# Now the ones with the same name are out of the way...
fullbases=
for name in $names
do
fullbases="$fullbases pack-$name"
chmod a-w "$PACKTMP-$name.pack"
chmod a-w "$PACKTMP-$name.idx"
mv -f "$PACKTMP-$name.pack" "$PACKDIR/pack-$name.pack" &&
mv -f "$PACKTMP-$name.idx" "$PACKDIR/pack-$name.idx" ||
exit
done
# Remove the "old-" files
for name in $names
do
rm -f "$PACKDIR/old-pack-$name.idx"
rm -f "$PACKDIR/old-pack-$name.pack"
done
# End of pack replacement.
if test "$remove_redundant" = t
then
# We know $existing are all redundant.
if [ -n "$existing" ]
then
( cd "$PACKDIR" &&
for e in $existing
do
case " $fullbases " in
*" $e "*) ;;
*) rm -f "$e.pack" "$e.idx" "$e.keep" ;;
esac
done
)
fi
git prune-packed ${GIT_QUIET:+-q}
fi
case "$no_update_info" in
t) : ;;
*) git update-server-info ;;
esac