Merge branch 'jk/common-main' into maint

diff --git a/contrib/subtree/git-subtree.sh b/contrib/subtree/git-subtree.sh
index 308b777b0aa43a7466fb3402cc67c1f023f57a7a..b567eaeff97bca0b42c7217a99cd73ea4b191f07 100755 (executable)
--- a/contrib/subtree/git-subtree.sh
+++ b/contrib/subtree/git-subtree.sh
@@ -90,7 +90,7 @@ while [ $# -gt 0 ]; do
                --annotate) annotate="$1"; shift ;;
                --no-annotate) annotate= ;;
                -b) branch="$1"; shift ;;
-               -P) prefix="$1"; shift ;;
+               -P) prefix="${1%/}"; shift ;;
                -m) message="$1"; shift ;;
                --no-prefix) prefix= ;;
                --onto) onto="$1"; shift ;;
@@ -245,7 +245,10 @@ find_latest_squash()
                case "$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 $?
@@ -648,6 +662,7 @@ cmd_split()
                debug "Merging split branch into HEAD..."
                latest_old=$(cache_get latest_old)
                git merge -s ours \
+                       --allow-unrelated-histories \
                        -m "$(rejoin_msg "$dir" $latest_old $latest_new)" \
                        $latest_new >&2 || exit $?
        fi