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