git-repack.sh

   1 #!/bin/sh
   2 #
   3 # Copyright (c) 2005 Linus Torvalds
   4 #
   5
   6 OPTIONS_KEEPDASHDASH=
   7 OPTIONS_SPEC="\
   8 git repack [options]
   9 --
  10 a               pack everything in a single pack
  11 A               same as -a, and turn unreachable objects loose
  12 d               remove redundant packs, and run git-prune-packed
  13 f               pass --no-reuse-delta to git-pack-objects
  14 F               pass --no-reuse-object to git-pack-objects
  15 n               do not run git-update-server-info
  16 q,quiet         be quiet
  17 l               pass --local to git-pack-objects
  18  Packing constraints
  19 window=         size of the window used for delta compression
  20 window-memory=  same as the above, but limit memory size instead of entries count
  21 depth=          limits the maximum delta depth
  22 max-pack-size=  maximum size of each packfile
  23 "
  24 SUBDIRECTORY_OK='Yes'
  25 . git-sh-setup
  26
  27 no_update_info= all_into_one= remove_redundant= unpack_unreachable=
  28 local= no_reuse= extra=
  29 while test $# != 0
  30 do
  31         case "$1" in
  32         -n)     no_update_info=t ;;
  33         -a)     all_into_one=t ;;
  34         -A)     all_into_one=t
  35                 unpack_unreachable=--unpack-unreachable ;;
  36         -d)     remove_redundant=t ;;
  37         -q)     GIT_QUIET=t ;;
  38         -f)     no_reuse=--no-reuse-delta ;;
  39         -F)     no_reuse=--no-reuse-object ;;
  40         -l)     local=--local ;;
  41         --max-pack-size|--window|--window-memory|--depth)
  42                 extra="$extra $1=$2"; shift ;;
  43         --) shift; break;;
  44         *)      usage ;;
  45         esac
  46         shift
  47 done
  48
  49 case "`git config --bool repack.usedeltabaseoffset || echo true`" in
  50 true)
  51         extra="$extra --delta-base-offset" ;;
  52 esac
  53
  54 PACKDIR="$GIT_OBJECT_DIRECTORY/pack"
  55 PACKTMP="$PACKDIR/.tmp-$$-pack"
  56 rm -f "$PACKTMP"-*
  57 trap 'rm -f "$PACKTMP"-*' 0 1 2 3 15
  58
  59 # There will be more repacking strategies to come...
  60 case ",$all_into_one," in
  61 ,,)
  62         args='--unpacked --incremental'
  63         ;;
  64 ,t,)
  65         args= existing=
  66         if [ -d "$PACKDIR" ]; then
  67                 for e in `cd "$PACKDIR" && find . -type f -name '*.pack' \
  68                         | sed -e 's/^\.\///' -e 's/\.pack$//'`
  69                 do
  70                         if [ -e "$PACKDIR/$e.keep" ]; then
  71                                 : keep
  72                         else
  73                                 existing="$existing $e"
  74                         fi
  75                 done
  76                 if test -n "$existing" -a -n "$unpack_unreachable" -a \
  77                         -n "$remove_redundant"
  78                 then
  79                         args="$args $unpack_unreachable"
  80                 fi
  81         fi
  82         ;;
  83 esac
  84
  85 mkdir -p "$PACKDIR" || exit
  86
  87 args="$args $local ${GIT_QUIET:+-q} $no_reuse$extra"
  88 names=$(git pack-objects --keep-true-parents --honor-pack-keep --non-empty --all --reflog $args </dev/null "$PACKTMP") ||
  89         exit 1
  90 if [ -z "$names" ]; then
  91         say Nothing new to pack.
  92 fi
  93
  94 # Ok we have prepared all new packfiles.
  95
  96 # First see if there are packs of the same name and if so
  97 # if we can move them out of the way (this can happen if we
  98 # repacked immediately after packing fully.
  99 rollback=
 100 failed=
 101 for name in $names
 102 do
 103         for sfx in pack idx
 104         do
 105                 file=pack-$name.$sfx
 106                 test -f "$PACKDIR/$file" || continue
 107                 rm -f "$PACKDIR/old-$file" &&
 108                 mv "$PACKDIR/$file" "$PACKDIR/old-$file" || {
 109                         failed=t
 110                         break
 111                 }
 112                 rollback="$rollback $file"
 113         done
 114         test -z "$failed" || break
 115 done
 116
 117 # If renaming failed for any of them, roll the ones we have
 118 # already renamed back to their original names.
 119 if test -n "$failed"
 120 then
 121         rollback_failure=
 122         for file in $rollback
 123         do
 124                 mv "$PACKDIR/old-$file" "$PACKDIR/$file" ||
 125                 rollback_failure="$rollback_failure $file"
 126         done
 127         if test -n "$rollback_failure"
 128         then
 129                 echo >&2 "WARNING: Some packs in use have been renamed by"
 130                 echo >&2 "WARNING: prefixing old- to their name, in order to"
 131                 echo >&2 "WARNING: replace them with the new version of the"
 132                 echo >&2 "WARNING: file.  But the operation failed, and"
 133                 echo >&2 "WARNING: attempt to rename them back to their"
 134                 echo >&2 "WARNING: original names also failed."
 135                 echo >&2 "WARNING: Please rename them in $PACKDIR manually:"
 136                 for file in $rollback_failure
 137                 do
 138                         echo >&2 "WARNING:   old-$file -> $file"
 139                 done
 140         fi
 141         exit 1
 142 fi
 143
 144 # Now the ones with the same name are out of the way...
 145 fullbases=
 146 for name in $names
 147 do
 148         fullbases="$fullbases pack-$name"
 149         chmod a-w "$PACKTMP-$name.pack"
 150         chmod a-w "$PACKTMP-$name.idx"
 151         mv -f "$PACKTMP-$name.pack" "$PACKDIR/pack-$name.pack" &&
 152         mv -f "$PACKTMP-$name.idx"  "$PACKDIR/pack-$name.idx" ||
 153         exit
 154 done
 155
 156 # Remove the "old-" files
 157 for name in $names
 158 do
 159         rm -f "$PACKDIR/old-pack-$name.idx"
 160         rm -f "$PACKDIR/old-pack-$name.pack"
 161 done
 162
 163 # End of pack replacement.
 164
 165 if test "$remove_redundant" = t
 166 then
 167         # We know $existing are all redundant.
 168         if [ -n "$existing" ]
 169         then
 170                 ( cd "$PACKDIR" &&
 171                   for e in $existing
 172                   do
 173                         case " $fullbases " in
 174                         *" $e "*) ;;
 175                         *)      rm -f "$e.pack" "$e.idx" "$e.keep" ;;
 176                         esac
 177                   done
 178                 )
 179         fi
 180         git prune-packed ${GIT_QUIET:+-q}
 181 fi
 182
 183 case "$no_update_info" in
 184 t) : ;;
 185 *) git update-server-info ;;
 186 esac