hooks/pre-receive

   1 #!/bin/sh
   2 #
   3 # Keep track of the last time we modified the object store
   4 #
   5 # Beware, we MAY be running in a chroot!
   6
   7 set -e
   8
   9 var_xargs_r=@var_xargs_r@
  10 umask 002
  11
  12 if [ -x @perlbin@ ]; then
  13         # We are NOT inside the chroot
  14         basedir=@basedir@
  15         list_packs() { command "$basedir/bin/list_packs" "$@"; }
  16 fi
  17
  18 # Some platforms' broken xargs runs the command always at least once even if
  19 # there's no input unless given a special option.  Automatically supply the
  20 # option on those platforms by providing an xargs function.
  21 xargs() { command xargs $var_xargs_r "$@"; }
  22
  23 git config gitweb.lastreceive "$(date '+%a, %d %b %Y %T %z')"
  24
  25 # Read the incoming refs and freshen old loose objects
  26 # If we waited until post-receive a gc could have already nuked them
  27 # We freshen the new ref in case it's being resurrected to protect it from gc
  28 # We probably do not need to do it for new refs as Git tries to do that,
  29 # but since we're already doing it for old refs (which Git does not do),
  30 # it's almost no extra work for new refs, just in case.  We also attempt
  31 # to make all packs user and group writable so they can be touched later.
  32
  33 octet='[0-9a-f][0-9a-f]'
  34 octet4="$octet$octet$octet$octet"
  35 octet20="$octet4$octet4$octet4$octet4$octet4"
  36 {
  37         find objects/pack -maxdepth 1 -type f \! -perm -ug+w \
  38                 -name "pack-$octet20.pack" -print0 | \
  39         xargs -0 chmod ug+w
  40 } 2>/dev/null || :
  41
  42 # Trigger a mini-gc if there are at least 20 packs present.
  43 # Our current pack that contains this push's data will have a .keep while
  44 # this hook is running so we do not use --exclude-keep here under the
  45 # assumption that by the time a mini-gc starts the .keep will have been
  46 # removed.  If not, that's okay too, it just means the current pack will
  47 # not take part in the mini-gc and will have to wait for the next one.
  48 # The mini-gc code contains the logic to sort out small packs vs. non-small
  49 # packs and which should be combined in what order so we do not need to
  50 # do any more complicated testing here.
  51 if ! [ -e .needsgc ]; then
  52         packs=
  53         { packs="$(list_packs --quiet --count --exclude-no-idx objects/pack || :)" || :; } 2>/dev/null
  54         if [ -n "$packs" ] && [ "$packs" -ge 20 ]; then
  55                 >.needsgc
  56         fi
  57 fi
  58
  59 while read -r old new ref; do
  60         oldp=
  61         newp=
  62         if [ "$old" != "0000000000000000000000000000000000000000" ]; then
  63                 # freshen mod time on recently unref'd loose objects
  64                 fn="${old#??}"
  65                 shard="${old%$fn}"
  66                 oldp="objects/$shard/$fn"
  67         fi
  68         if [ "$new" != "0000000000000000000000000000000000000000" ]; then
  69                 # prevent imminent pruning of a ref being resurrected
  70                 fn="${new#??}"
  71                 shard="${new%$fn}"
  72                 newp="objects/$shard/$fn"
  73         fi
  74         chmod ug+w $oldp $newp 2>/dev/null || :
  75         touch -c $oldp $newp 2>/dev/null || :
  76 done