Merge branch 'maint'

diff --git a/contrib/subtree/git-subtree.sh b/contrib/subtree/git-subtree.sh
index edf36f8c36091551d0a3e6cacb6c91446f0147eb..7a39b30ad09483ef9796d98ca78e52f652046582 100755 (executable)
--- a/contrib/subtree/git-subtree.sh
+++ b/contrib/subtree/git-subtree.sh
@@ -245,7 +245,10 @@ find_latest_squash()
                case "$a" in
                        START) sq="$b" ;;
                        git-subtree-mainline:) main="$b" ;;
-                       git-subtree-split:) sub="$b" ;;
+                       git-subtree-split:)
+                               sub="$(git rev-parse "$b^0")" ||
+                                   die "could not rev-parse split hash $b from commit $sq"
+                               ;;
                        END)
                                if [ -n "$sub" ]; then
                                        if [ -n "$main" ]; then
@@ -278,7 +281,10 @@ find_existing_splits()
                case "$a" in
                        START) sq="$b" ;;
                        git-subtree-mainline:) main="$b" ;;
-                       git-subtree-split:) sub="$b" ;;
+                       git-subtree-split:)
+                               sub="$(git rev-parse "$b^0")" ||
+                                   die "could not rev-parse split hash $b from commit $sq"
+                               ;;
                        END)
                                debug "  Main is: '$main'"
                                if [ -z "$main" -a -n "$sub" ]; then
@@ -479,8 +485,16 @@ copy_or_skip()
                        p="$p -p $parent"
                fi
        done
-       
-       if [ -n "$identical" ]; then
+
+       copycommit=
+       if [ -n "$identical" ] && [ -n "$nonidentical" ]; then
+               extras=$(git rev-list --count $identical..$nonidentical)
+               if [ "$extras" -ne 0 ]; then
+                       # we need to preserve history along the other branch
+                       copycommit=1
+               fi
+       fi
+       if [ -n "$identical" ] && [ -z "$copycommit" ]; then
                echo $identical
        else
                copy_commit $rev $tree "$p" || exit $?