GIT-VERSION-GEN

   1 #!/bin/sh
   2
   3 DEF_VER=v2.50.GIT
   4
   5 LF='
   6 '
   7
   8 if test "$#" -lt 2 || test "$#" -gt 3
   9 then
  10     echo >&2 "USAGE: $0 <SOURCE_DIR> (--format=<STRING>|<INPUT>) [<OUTPUT>]"
  11     exit 1
  12 fi
  13
  14 SOURCE_DIR="$1"
  15
  16 case "$2" in
  17 --format=*)
  18         INPUT="${2#--format=}"
  19         ;;
  20 *)
  21         if ! test -f "$2"
  22         then
  23                 echo >&2 "Input is not a file: $2"
  24                 exit 1
  25         fi
  26         INPUT=$(cat "$2")
  27         ;;
  28 esac
  29
  30 OUTPUT="$3"
  31
  32 # Protect us from reading Git version information outside of the Git directory
  33 # in case it is not a repository itself, but embedded in an unrelated
  34 # repository.
  35 GIT_CEILING_DIRECTORIES="$SOURCE_DIR/.."
  36 export GIT_CEILING_DIRECTORIES
  37
  38 if test -z "$GIT_VERSION"
  39 then
  40         # First see if there is a version file (included in release tarballs),
  41         # then try git-describe, then default.
  42         if test -f "$SOURCE_DIR"/version
  43         then
  44                 VN=$(cat "$SOURCE_DIR"/version) || VN="$DEF_VER"
  45         elif {
  46                         test -d "$SOURCE_DIR/.git" ||
  47                         test -d "${GIT_DIR:-.git}" ||
  48                         test -f "$SOURCE_DIR"/.git;
  49                 } &&
  50                 VN=$(git -C "$SOURCE_DIR" describe --dirty --match="v[0-9]*" 2>/dev/null) &&
  51                 case "$VN" in
  52                 *$LF*) (exit 1) ;;
  53                 esac
  54         then
  55                 VN=$(echo "$VN" | sed -e 's/-/./g');
  56         else
  57                 VN="$DEF_VER"
  58         fi
  59
  60         GIT_VERSION=$(expr "$VN" : v*'\(.*\)')
  61 fi
  62
  63 if test -z "$GIT_BUILT_FROM_COMMIT"
  64 then
  65         GIT_BUILT_FROM_COMMIT=$(git -C "$SOURCE_DIR" rev-parse -q --verify HEAD 2>/dev/null)
  66 fi
  67
  68 if test -z "$GIT_DATE"
  69 then
  70         GIT_DATE=$(git -C "$SOURCE_DIR" show --quiet --format='%as' 2>/dev/null)
  71 fi
  72
  73 if test -z "$GIT_USER_AGENT"
  74 then
  75         GIT_USER_AGENT="git/$GIT_VERSION"
  76 fi
  77
  78 # While released Git versions only have three numbers, development builds also
  79 # have a fourth number that corresponds to the number of patches since the last
  80 # release.
  81 read GIT_MAJOR_VERSION GIT_MINOR_VERSION GIT_MICRO_VERSION GIT_PATCH_LEVEL trailing <<EOF
  82 $(echo "$GIT_VERSION" 0 0 0 0 | tr '.a-zA-Z-' ' ')
  83 EOF
  84
  85 REPLACED=$(printf "%s\n" "$INPUT" | sed -e "s|@GIT_VERSION@|$GIT_VERSION|" \
  86         -e "s|@GIT_MAJOR_VERSION@|$GIT_MAJOR_VERSION|" \
  87         -e "s|@GIT_MINOR_VERSION@|$GIT_MINOR_VERSION|" \
  88         -e "s|@GIT_MICRO_VERSION@|$GIT_MICRO_VERSION|" \
  89         -e "s|@GIT_PATCH_LEVEL@|$GIT_PATCH_LEVEL|" \
  90         -e "s|@GIT_BUILT_FROM_COMMIT@|$GIT_BUILT_FROM_COMMIT|" \
  91         -e "s|@GIT_USER_AGENT@|$GIT_USER_AGENT|" \
  92         -e "s|@GIT_DATE@|$GIT_DATE|"
  93 )
  94
  95 if test -z "$OUTPUT"
  96 then
  97         printf "%s\n" "$REPLACED"
  98 else
  99         printf "%s\n" "$REPLACED" >"$OUTPUT".$$+
 100         if ! test -f "$OUTPUT" || ! cmp "$OUTPUT".$$+ "$OUTPUT" >/dev/null
 101         then
 102                 mv "$OUTPUT".$$+ "$OUTPUT"
 103         else
 104                 rm "$OUTPUT".$$+
 105         fi
 106 fi