jobd/gc.sh

   1 #!/bin/sh
   2
   3 . @basedir@/shlib.sh
   4
   5 set -e
   6 trap 'if [ $? != 0 ]; then echo "gc failed dir: $PWD" >&2; fi; rm -f "$bang_log"' EXIT
   7
   8 # packing options
   9 packopts='--window=50 --window-memory=1g --depth=50'
  10
  11 umask 002
  12 [ "$cfg_permission_control" != "Hooks" ] || umask 000
  13
  14 pidactive() {
  15         if _result="$(kill -0 "$1" 2>&1)"; then
  16                 # process exists and we have permission to signal it
  17                 return 0
  18         fi
  19         case "$_result" in *"not permitted"*)
  20                 # we do not have permission to signal the process
  21                 return 0
  22         esac
  23         # process does not exist
  24         return 1
  25 }
  26
  27 createlock() {
  28         for _try in p n; do
  29                 if (set -C; > "$1.lock") 2>/dev/null; then
  30                         echo "$1.lock"
  31                         return 0
  32                 fi
  33                 # delay and try again
  34                 [ "$_try" != "p" ] || sleep 1
  35         done
  36         # cannot create temp file
  37         return 1
  38 }
  39
  40 # if the current directory is_gfi_mirror then repack all packs listed in gfi-packs
  41 repack_gfi_packs() {
  42         is_gfi_mirror || return 0
  43         [ -s gfi-packs ] || return 0
  44         while IFS=': ' read -r _pack _junk; do
  45                 if [ -s "$_pack" -a -s "${_pack%.pack}.idx" ]; then
  46                         git show-index < "${_pack%.pack}.idx" | cut -d ' ' -f 2
  47                 fi
  48         done < gfi-packs | \
  49         git pack-objects $packopts --no-reuse-delta --threads=1 $quiet objects/pack/packtmp | \
  50         while read -r _newpack; do
  51                 rm -f objects/pack/pack-$_newpack.*
  52                 ln objects/pack/packtmp-$_newpack.pack objects/pack/pack-$_newpack.pack
  53                 ln objects/pack/packtmp-$_newpack.idx objects/pack/pack-$_newpack.idx
  54                 rm -f objects/pack/packtmp-$_newpack.*
  55         done
  56         rm -f gfi-packs
  57 }
  58
  59 proj="$1"
  60 cd "$cfg_reporoot/$proj.git"
  61
  62 # date -R is linux-only, POSIX equivalent is '+%a, %d %b %Y %T %z'
  63 datefmt='+%a, %d %b %Y %T %z'
  64
  65 if check_interval lastgc $cfg_min_gc_interval; then
  66         progress "= [$proj] garbage check skip (last at $(config_get lastgc))"
  67         exit 0
  68 fi
  69 if [ -e .nogc ]; then
  70         progress "x [$proj] garbage check disabled"
  71         exit 0
  72 fi
  73
  74 # be compatibile with gc.pid file from newer Git releases
  75
  76 hn="$(hostname)"
  77 lockf=gc.pid
  78 active=
  79 if [ "$(createlock "$lockf")" ]; then
  80         # If $lockf is:
  81         #   1) less than 12 hours old
  82         #   2) contains two fields (pid hostname) NO trailing NL
  83         #   3) the hostname is different OR the pid is still alive
  84         # then we exit as another active process is holding the lock
  85         if [ "$(find "$lockf" -mmin -720 -print 2>/dev/null)" ]; then
  86                 apid=
  87                 ahost=
  88                 read -r apid ahost ajunk < "$lockf" || :
  89                 if [ "$apid" ] && [ "$ahost" ]; then
  90                         if [ "$ahost" != "$hn" ] || pidactive "$apid"; then
  91                                 active=1
  92                         fi
  93                 fi
  94         fi
  95 else
  96         echo >&2 "[$proj] unable to create gc.pid.lock file"
  97         exit 1
  98 fi
  99 if [ -n "$active" ]; then
 100         rm "$lockf.lock"
 101         echo >&2 "[$proj] gc already running on machine '$ahost' pid '$apid'"
 102         exit 1
 103 fi
 104 printf "%s %s" "$$" "$hn" > "$lockf.lock"
 105 chmod 0664 "$lockf.lock"
 106 mv -f "$lockf.lock" "$lockf"
 107
 108 progress "+ [$proj] garbage check (`date`)"
 109
 110 # safe pruning: we put all our objects in all forks, then we can
 111 # safely get rid of extra ones; repacks in forks will get rid of
 112 # the redundant ones again then
 113 forkdir="$1"
 114 if [ -d "../${forkdir##*/}" ]; then
 115         # It is enough to copy objects just one level down and get_repo_list
 116         # takes a regular expression (which is automatically prefixed with '^')
 117         # so we can easily match forks exactly one level down from this project
 118         get_repo_list "$forkdir/[^/]*:" |
 119                 while read fork; do
 120                         # Ignore forks that do not exist or are symbolic links
 121                         [ ! -L "$cfg_reporoot/$fork.git" -a -d "$cfg_reporoot/$fork.git" ] || \
 122                                 continue
 123                         # Match objects in parent project
 124                         for d in objects/?? objects/pack; do
 125                                 [ "$d" != "objects/??" ] || continue
 126                                 mkdir -p "$cfg_reporoot/$fork.git/$d"
 127                                 [ "$d" != "objects/pack" ] || \
 128                                         [ "$(echo objects/pack/*)" != \
 129                                                         "objects/pack/*" ] || \
 130                                         continue
 131                                 ln -f "$d"/* "$cfg_reporoot/$fork.git/$d" || :
 132                         done
 133                 done
 134 fi
 135
 136 quiet=; [ -n "$show_progress" ] || quiet=-q
 137 git pack-refs --all
 138 repack_gfi_packs
 139 git repack $packopts -a -d -l $quiet
 140 git prune
 141 git update-server-info
 142 # darcs:// mirrors have a xxx.log file that will grow endlessly
 143 # if this is a mirror and the file exists, shorten it to 10000 lines
 144 # also take this opportunity to optimize the darcs repo
 145 if [ ! -e .nofetch ] && [ -n "$cfg_mirror" ]; then
 146         url="$(config_get baseurl || :)"
 147         case "$url" in darcs://*)
 148                 if [ -n "$cfg_mirror_darcs" ]; then
 149                         url="${url%/}"
 150                         basedarcs="$(basename "${url#darcs:/}")"
 151                         if [ -f "$basedarcs.log" ]; then
 152                                 tail -n 10000 "$basedarcs.log" > "$basedarcs.log.$$"
 153                                 mv -f "$basedarcs.log.$$" "$basedarcs.log"
 154                         fi
 155                         if [ -d "$basedarcs.darcs" ]; then
 156                                 (
 157                                         cd "$basedarcs.darcs"
 158                                         # Note that this does not optimize _darcs/inventories/ :(
 159                                         darcs optimize
 160                                 )
 161                         fi
 162                 fi
 163         esac
 164 fi
 165 config_set lastgc "$(date "$datefmt")"
 166 rm "$lockf"
 167
 168 progress "- [$proj] garbage check (`date`)"