ppg-repack

   1 #!/bin/sh
   2 #
   3 # Copyright (c) 2005 Linus Torvalds
   4 #
   5
   6 ##
   7 ## cribbed from git v1.8.3-rc1-26-g8a45db1
   8 ##
   9
  10 OPTIONS_KEEPDASHDASH=
  11 OPTIONS_SPEC="\
  12 git repack [options]
  13 --
  14 a               pack everything in a single pack
  15 A               same as -a, and turn unreachable objects loose
  16 d               remove redundant packs, and run git-prune-packed
  17 f               pass --no-reuse-delta to git-pack-objects
  18 F               pass --no-reuse-object to git-pack-objects
  19 n               do not run git-update-server-info
  20 q,quiet         be quiet
  21 l               pass --local to git-pack-objects
  22 unpack-unreachable=  with -A, do not loosen objects older than this
  23  Packing constraints
  24 window=         size of the window used for delta compression
  25 window-memory=  same as the above, but limit memory size instead of entries count
  26 depth=          limits the maximum delta depth
  27 max-pack-size=  maximum size of each packfile
  28 "
  29 SUBDIRECTORY_OK='Yes'
  30 GIT_EXEC_PATH=$(git --exec-path)
  31 . $GIT_EXEC_PATH/git-sh-setup
  32
  33 no_update_info= all_into_one= remove_redundant= unpack_unreachable=
  34 local= no_reuse= extra=
  35 while test $# != 0
  36 do
  37         case "$1" in
  38         -n)     no_update_info=t ;;
  39         -a)     all_into_one=t ;;
  40         -A)     all_into_one=t
  41                 unpack_unreachable=--unpack-unreachable ;;
  42         --unpack-unreachable)
  43                 unpack_unreachable="--unpack-unreachable=$2"; shift ;;
  44         -d)     remove_redundant=t ;;
  45         -q)     GIT_QUIET=t ;;
  46         -f)     no_reuse=--no-reuse-delta ;;
  47         -F)     no_reuse=--no-reuse-object ;;
  48         -l)     local=--local ;;
  49         --max-pack-size|--window|--window-memory|--depth)
  50                 extra="$extra $1=$2"; shift ;;
  51         --) shift; break;;
  52         *)      usage ;;
  53         esac
  54         shift
  55 done
  56
  57 case "`git config --bool repack.usedeltabaseoffset || echo true`" in
  58 true)
  59         extra="$extra --delta-base-offset" ;;
  60 esac
  61
  62 PACKDIR="$GIT_OBJECT_DIRECTORY/pack"
  63 PACKTMP="$PACKDIR/.tmp-$$-pack"
  64 rm -f "$PACKTMP"-*
  65 trap 'rm -f "$PACKTMP"-*' 0 1 2 3 15
  66
  67 # There will be more repacking strategies to come...
  68 case ",$all_into_one," in
  69 ,,)
  70         args='--unpacked --incremental'
  71         ;;
  72 ,t,)
  73         args= existing=
  74         if [ -d "$PACKDIR" ]; then
  75                 for e in `cd "$PACKDIR" && find . -type f -name '*.pack' \
  76                         | sed -e 's/^\.\///' -e 's/\.pack$//'`
  77                 do
  78                         if [ -e "$PACKDIR/$e.keep" ]; then
  79                                 : keep
  80                         else
  81                                 existing="$existing $e"
  82                         fi
  83                 done
  84                 if test -n "$existing" -a -n "$unpack_unreachable" -a \
  85                         -n "$remove_redundant"
  86                 then
  87                         # This may have arbitrary user arguments, so we
  88                         # have to protect it against whitespace splitting
  89                         # when it gets run as "pack-objects $args" later.
  90                         # Fortunately, we know it's an approxidate, so we
  91                         # can just use dots instead.
  92                         args="$args $(echo "$unpack_unreachable" | tr ' ' .)"
  93                 fi
  94         fi
  95         ;;
  96 esac
  97
  98 mkdir -p "$PACKDIR" || exit
  99
 100 args="$args $local ${GIT_QUIET:+-q} $no_reuse$extra"
 101 # we skip --keep-true-parents so history masked by a graft
 102 # is discarded ...
 103 names=$(git pack-objects --honor-pack-keep --non-empty --all --reflog $args </dev/null "$PACKTMP") ||
 104         exit 1
 105 if [ -z "$names" ]; then
 106         say Nothing new to pack.
 107 fi
 108
 109 # Ok we have prepared all new packfiles.
 110
 111 # First see if there are packs of the same name and if so
 112 # if we can move them out of the way (this can happen if we
 113 # repacked immediately after packing fully.
 114 rollback=
 115 failed=
 116 for name in $names
 117 do
 118         for sfx in pack idx
 119         do
 120                 file=pack-$name.$sfx
 121                 test -f "$PACKDIR/$file" || continue
 122                 rm -f "$PACKDIR/old-$file" &&
 123                 mv "$PACKDIR/$file" "$PACKDIR/old-$file" || {
 124                         failed=t
 125                         break
 126                 }
 127                 rollback="$rollback $file"
 128         done
 129         test -z "$failed" || break
 130 done
 131
 132 # If renaming failed for any of them, roll the ones we have
 133 # already renamed back to their original names.
 134 if test -n "$failed"
 135 then
 136         rollback_failure=
 137         for file in $rollback
 138         do
 139                 mv "$PACKDIR/old-$file" "$PACKDIR/$file" ||
 140                 rollback_failure="$rollback_failure $file"
 141         done
 142         if test -n "$rollback_failure"
 143         then
 144                 echo >&2 "WARNING: Some packs in use have been renamed by"
 145                 echo >&2 "WARNING: prefixing old- to their name, in order to"
 146                 echo >&2 "WARNING: replace them with the new version of the"
 147                 echo >&2 "WARNING: file.  But the operation failed, and"
 148                 echo >&2 "WARNING: attempt to rename them back to their"
 149                 echo >&2 "WARNING: original names also failed."
 150                 echo >&2 "WARNING: Please rename them in $PACKDIR manually:"
 151                 for file in $rollback_failure
 152                 do
 153                         echo >&2 "WARNING:   old-$file -> $file"
 154                 done
 155         fi
 156         exit 1
 157 fi
 158
 159 # Now the ones with the same name are out of the way...
 160 fullbases=
 161 for name in $names
 162 do
 163         fullbases="$fullbases pack-$name"
 164         chmod a-w "$PACKTMP-$name.pack"
 165         chmod a-w "$PACKTMP-$name.idx"
 166         mv -f "$PACKTMP-$name.pack" "$PACKDIR/pack-$name.pack" &&
 167         mv -f "$PACKTMP-$name.idx"  "$PACKDIR/pack-$name.idx" ||
 168         exit
 169 done
 170
 171 # Remove the "old-" files
 172 for name in $names
 173 do
 174         rm -f "$PACKDIR/old-pack-$name.idx"
 175         rm -f "$PACKDIR/old-pack-$name.pack"
 176 done
 177
 178 # End of pack replacement.
 179
 180 if test "$remove_redundant" = t
 181 then
 182         # We know $existing are all redundant.
 183         if [ -n "$existing" ]
 184         then
 185                 ( cd "$PACKDIR" &&
 186                   for e in $existing
 187                   do
 188                         case " $fullbases " in
 189                         *" $e "*) ;;
 190                         *)      rm -f "$e.pack" "$e.idx" "$e.keep" ;;
 191                         esac
 192                   done
 193                 )
 194         fi
 195         git prune-packed ${GIT_QUIET:+-q}
 196 fi
 197
 198 case "$no_update_info" in
 199 t) : ;;
 200 *) git update-server-info ;;
 201 esac