jobd/gc-util-functions.sh

   1 #!/bin/sh
   2 #
   3 # This is a shell library for common gc related functions
   4 # used by various Girocco scripts.
   5
   6 # shlib.sh always sets this, it's an error to source
   7 # this script without having already sourced shlib.sh
   8 [ -n "$var_git_exec_path" ] || exit 2
   9
  10 # make sure combine-packs uses the correct Git executable
  11 run_combine_packs() {
  12         PATH="$var_git_exec_path:$cfg_basedir/bin:$PATH" @basedir@/jobd/combine-packs.sh "$@"
  13 }
  14
  15 # duplicate the first file to the name given by the second file making sure that
  16 # the second file appears atomically all-at-once after the copy has been completed
  17 # and does not appear at all if the copy fails (in which case this function fails)
  18 # if the second file already exists this function fails with status 1
  19 # if the file names are the same this function returns immediately with success
  20 dupe_file() {
  21         [ "$1" != "$2" ] || return 0
  22         ! [ -e "$2" ] || return 1
  23         case "$2" in
  24                 *?/?*)  _tmpdir="${2%/*}";;
  25                 *)      _tmpdir=".";;
  26         esac
  27         _tmpfile="$(mktemp "${_tmpdir:-.}/packtmp-XXXXXX")" || return 1
  28         cp -fp "$1" "$_tmpfile" || return 1
  29         mv -f "$_tmpfile" "$2"
  30 }
  31
  32 # rename_pack oldnamepath newnamepath
  33 # note that .keep and .bndl files are left untouched and not moved at all!
  34 rename_pack() {
  35         [ $# -eq 2 ] && [ "$1" != "$2" ] || {
  36                 echo >&2 "[$proj] incorrect use of rename_pack function"
  37                 exit 1
  38         }
  39         # Git assumes that if the destination of the rename already exists
  40         # that it is, in fact, a copy of the same bytes so silently succeeds
  41         # without doing anything.  We duplicate that logic here.
  42         # Git checks for the .idx file first before even trying to use a pack
  43         # so it should be the last moved and the first removed.
  44         for ext in pack bitmap idx; do
  45                 [ -f "$1.$ext" ] || continue
  46                 ln "$1.$ext" "$2.$ext" >/dev/null 2>&1 ||
  47                 dupe_file "$1.$ext" "$2.$ext" >/dev/null 2>&1 ||
  48                 [ -f "$2.$ext" ] || {
  49                         echo >&2 "[$proj] unable to move $1.$ext to $2.$ext"
  50                         exit 1
  51                 }
  52         done
  53         for ext in idx pack bitmap; do
  54                 rm -f "$1.$ext"
  55         done
  56         return 0
  57 }
  58
  59 # current directory must already be set to the $GIT_DIR
  60 # see if there are "lotsa" loose objects
  61 # "lotsa" is defined as the 17, 68, 71 and 86 object directories existing
  62 # and there being at least 5 total objects between them which corresponds
  63 # to an approximate average of 320 loose objects before this function starts
  64 # returning true and triggering a "mini" gc to pack up loose objects
  65 lotsa_loose_objects() {
  66         [ -d objects/17 ] && [ -d objects/68 ] && [ -d objects/71 ] && [ -d objects/86 ] || return 1
  67         _objs=$(( $(find -L objects/17 objects/68 objects/71 objects/86 -maxdepth 1 -name "$octet19*" -type f -print 2>/dev/null | LC_ALL=C wc -l) ))
  68         [ ${_objs:-0} -ge 5 ]
  69 }