git/git-gui/GIT-VERSION-GEN

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#!/bin/sh
DEF_VER=0.21.GITGUI
LF='
'
if test "$#" -ne 2
then
echo >&2 "usage: $0 <SOURCE_DIR> <OUTPUT>"
exit 1
fi
SOURCE_DIR="$1"
OUTPUT="$2"
# Protect us from reading Git version information outside of the Git directory
# in case it is not a repository itself, but embedded in an unrelated
# repository.
GIT_CEILING_DIRECTORIES="$SOURCE_DIR/.."
export GIT_CEILING_DIRECTORIES
tree_search ()
{
head=$1
tree=$2
for p in $(git -C "$SOURCE_DIR" rev-list --parents --max-count=1 $head 2>/dev/null)
do
test $tree = $(git -C "$SOURCE_DIR" rev-parse $p^{tree} 2>/dev/null) &&
vn=$(git -C "$SOURCE_DIR" describe --abbrev=4 $p 2>/dev/null) &&
case "$vn" in
gitgui-[0-9]*) echo $vn; break;;
esac
done
}
# Always use the tarball version file if found, just
# in case we are somehow contained in a larger git
# repository that doesn't actually track our state.
# (At least one package manager is doing this.)
#
# We may be a subproject, so try looking for the merge
# commit that supplied this directory content if we are
# not at the toplevel. We probably will always be the
# second parent in the commit, but we shouldn't rely on
# that fact.
#
# If we are at the toplevel or the merge assumption fails
# try looking for a gitgui-* tag.
if test -f "$SOURCE_DIR"/version &&
VN=$(cat "$SOURCE_DIR"/version)
then
: happy
elif prefix="$(git -C "$SOURCE_DIR" rev-parse --show-prefix 2>/dev/null)"
test -n "$prefix" &&
head=$(git -C "$SOURCE_DIR" rev-list --max-count=1 HEAD -- . 2>/dev/null) &&
tree=$(git -C "$SOURCE_DIR" rev-parse --verify "HEAD:$prefix" 2>/dev/null) &&
VN=$(tree_search $head $tree)
case "$VN" in
gitgui-[0-9]*) : happy ;;
*) (exit 1) ;;
esac
then
VN=$(echo "$VN" | sed -e 's/^gitgui-//;s/-/./g');
elif VN=$(git -C "$SOURCE_DIR" describe --abbrev=4 HEAD 2>/dev/null) &&
case "$VN" in
gitgui-[0-9]*) : happy ;;
*) (exit 1) ;;
esac
then
VN=$(echo "$VN" | sed -e 's/^gitgui-//;s/-/./g');
else
VN="$DEF_VER"
fi
dirty=$(git -C "$SOURCE_DIR" diff-index --name-only HEAD 2>/dev/null) || dirty=
case "$dirty" in
'')
;;
*)
VN="$VN-dirty" ;;
esac
if test -r "$OUTPUT"
then
VC=$(sed -e 's/^GITGUI_VERSION=//' <"$OUTPUT")
else
VC=unset
fi
test "$VN" = "$VC" || {
echo >&2 "GITGUI_VERSION=$VN"
echo "GITGUI_VERSION=$VN" >"$OUTPUT"
}