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