X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=blobdiff_plain;f=GIT-VERSION-GEN;h=cfe46a857e5fd319fa6eb49474ddbb37bd47c537;hb=5f09a37bbb3507a1e66734e9feae915fa6e8cea6;hp=79558f39cf968d712dc0230dc9cb538f92ad4a78;hpb=7e81d4eead48c189d52406379150b09fd4096987;p=git.git

diff --git a/GIT-VERSION-GEN b/GIT-VERSION-GEN
index 79558f39c..cfe46a857 100755
--- a/GIT-VERSION-GEN
+++ b/GIT-VERSION-GEN
@@ -1,29 +1,65 @@
 #!/bin/sh
 
 GVF=GIT-VERSION-FILE
-DEF_VER=v0.5.GIT
+DEF_VER=0.9.GITGUI
 
 LF='
 '
 
-# First try git-describe, then see if there is a version file
-# (included in release tarballs), then default
-if VN=$(git describe --abbrev=4 HEAD 2>/dev/null) &&
+tree_search ()
+{
+	head=$1
+	tree=$2
+	for p in $(git rev-list --parents --max-count=1 $head 2>/dev/null)
+	do
+		test $tree = $(git rev-parse $p^{tree} 2>/dev/null) &&
+		vn=$(git describe --abbrev=4 $p 2>/dev/null) &&
+		case "$vn" in
+		gitgui-[0-9]*) echo $vn; break;;
+		esac
+	done
+}
+
+# Always use the tarball version file if found, just
+# in case we are somehow contained in a larger git
+# repository that doesn't actually track our state.
+# (At least one package manager is doing this.)
+#
+# We may be a subproject, so try looking for the merge
+# commit that supplied this directory content if we are
+# not at the toplevel.  We probably will always be the
+# second parent in the commit, but we shouldn't rely on
+# that fact.
+#
+# If we are at the toplevel or the merge assumption fails
+# try looking for a gitgui-* tag.
+
+if test -f version &&
+   VN=$(cat version)
+then
+	: happy
+elif prefix="$(git rev-parse --show-prefix 2>/dev/null)"
+   test -n "$prefix" &&
+   head=$(git rev-list --max-count=1 HEAD -- . 2>/dev/null) &&
+   tree=$(git rev-parse --verify "HEAD:$prefix" 2>/dev/null) &&
+   VN=$(tree_search $head $tree)
    case "$VN" in
-   *$LF*) (exit 1) ;;
-   v[0-9]*) : happy ;;
+   gitgui-[0-9]*) : happy ;;
+   *) (exit 1) ;;
    esac
 then
-	VN=$(echo "$VN" | sed -e 's/-/./g');
-elif test -f version
+	VN=$(echo "$VN" | sed -e 's/^gitgui-//;s/-/./g');
+elif VN=$(git describe --abbrev=4 HEAD 2>/dev/null) &&
+   case "$VN" in
+   gitgui-[0-9]*) : happy ;;
+   *) (exit 1) ;;
+   esac
 then
-	VN=$(cat version) || VN="$DEF_VER"
+	VN=$(echo "$VN" | sed -e 's/^gitgui-//;s/-/./g');
 else
 	VN="$DEF_VER"
 fi
 
-VN=$(expr "$VN" : v*'\(.*\)')
-
 dirty=$(sh -c 'git diff-index --name-only HEAD' 2>/dev/null) || dirty=
 case "$dirty" in
 '')
@@ -42,5 +78,3 @@ test "$VN" = "$VC" || {
 	echo >&2 "GITGUI_VERSION = $VN"
 	echo "GITGUI_VERSION = $VN" >$GVF
 }
-
-