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