1 files changed, 106 insertions, 0 deletions
diff --git a/GIT-VERSION-GEN b/GIT-VERSION-GEN
new file mode 100755
index 0000000000..b16db85e77
--- /dev/null
+++ b/GIT-VERSION-GEN
@@ -0,0 +1,106 @@
+#!/bin/sh
+
+DEF_VER=v2.51.GIT
+
+LF='
+'
+
+if test "$#" -lt 2 || test "$#" -gt 3
+then
+    echo >&2 "USAGE: $0 <SOURCE_DIR> (--format=<STRING>|<INPUT>) [<OUTPUT>]"
+    exit 1
+fi
+
+SOURCE_DIR="$1"
+
+case "$2" in
+--format=*)
+	INPUT="${2#--format=}"
+	;;
+*)
+	if ! test -f "$2"
+	then
+		echo >&2 "Input is not a file: $2"
+		exit 1
+	fi
+	INPUT=$(cat "$2")
+	;;
+esac
+
+OUTPUT="$3"
+
+# Protect us from reading Git version information outside of the Git directory
+# in case it is not a repository itself, but embedded in an unrelated
+# repository.
+GIT_CEILING_DIRECTORIES="$SOURCE_DIR/.."
+export GIT_CEILING_DIRECTORIES
+
+if test -z "$GIT_VERSION"
+then
+	# First see if there is a version file (included in release tarballs),
+	# then try git-describe, then default.
+	if test -f "$SOURCE_DIR"/version
+	then
+		VN=$(cat "$SOURCE_DIR"/version) || VN="$DEF_VER"
+	elif {
+			test -d "$SOURCE_DIR/.git" ||
+			test -d "${GIT_DIR:-.git}" ||
+			test -f "$SOURCE_DIR"/.git;
+		} &&
+		VN=$(git -C "$SOURCE_DIR" describe --dirty --match="v[0-9]*" 2>/dev/null) &&
+		case "$VN" in
+		*$LF*) (exit 1) ;;
+		esac
+	then
+		VN=$(echo "$VN" | sed -e 's/-/./g');
+	else
+		VN="$DEF_VER"
+	fi
+
+	GIT_VERSION=$(expr "$VN" : v*'\(.*\)')
+fi
+
+if test -z "$GIT_BUILT_FROM_COMMIT"
+then
+	GIT_BUILT_FROM_COMMIT=$(git -C "$SOURCE_DIR" rev-parse -q --verify HEAD 2>/dev/null)
+fi
+
+if test -z "$GIT_DATE"
+then
+	GIT_DATE=$(git -C "$SOURCE_DIR" show --quiet --format='%as' 2>/dev/null)
+fi
+
+if test -z "$GIT_USER_AGENT"
+then
+	GIT_USER_AGENT="git/$GIT_VERSION"
+fi
+
+# While released Git versions only have three numbers, development builds also
+# have a fourth number that corresponds to the number of patches since the last
+# release.
+read GIT_MAJOR_VERSION GIT_MINOR_VERSION GIT_MICRO_VERSION GIT_PATCH_LEVEL trailing <<EOF
+$(echo "$GIT_VERSION" 0 0 0 0 | tr '.a-zA-Z-' ' ')
+EOF
+
+REPLACED=$(printf "%s\n" "$INPUT" | sed -e "s|@GIT_VERSION@|$GIT_VERSION|" \
+	-e "s|@GIT_MAJOR_VERSION@|$GIT_MAJOR_VERSION|" \
+	-e "s|@GIT_MINOR_VERSION@|$GIT_MINOR_VERSION|" \
+	-e "s|@GIT_MICRO_VERSION@|$GIT_MICRO_VERSION|" \
+	-e "s|@GIT_PATCH_LEVEL@|$GIT_PATCH_LEVEL|" \
+	-e "s|@GIT_BUILT_FROM_COMMIT@|$GIT_BUILT_FROM_COMMIT|" \
+	-e "s|@GIT_USER_AGENT@|$GIT_USER_AGENT|" \
+	-e "s|@GIT_DATE@|$GIT_DATE|"
+)
+
+if test -z "$OUTPUT"
+then
+	printf "%s\n" "$REPLACED"
+else
+	printf "%s\n" "$REPLACED" >"$OUTPUT".$$+
+	if ! test -f "$OUTPUT" || ! cmp "$OUTPUT".$$+ "$OUTPUT" >/dev/null
+	then
+		mv "$OUTPUT".$$+ "$OUTPUT"
+	else
+		rm "$OUTPUT".$$+
+	fi
+fi