Avoid accessing a slow working copy during diffcore operations.

diff --git a/git-merge.sh b/git-merge.sh
index 397b33f8d33b67018669cb4610a2051407fc3eb7..c895a04f6be0e09670af71532558abe994369a64 100755 (executable)
--- a/git-merge.sh
+++ b/git-merge.sh
@@ -188,8 +188,9 @@ else
        # in this loop.
        merge_name=$(for remote
                do
-                       rh=$(git-rev-parse --verify "$remote"^0 2>/dev/null) &&
-                       bh=$(git show-ref -s --verify "refs/heads/$remote") &&
+                       rh=$(git-rev-parse --verify "$remote"^0 2>/dev/null) ||
+                       continue ;# not something we can merge
+                       bh=$(git show-ref -s --verify "refs/heads/$remote" 2>/dev/null)
                        if test "$rh" = "$bh"
                        then
                                echo "$rh               branch '$remote' of ."
@@ -399,7 +400,14 @@ fi
 case "$best_strategy" in
 '')
        restorestate
-       echo >&2 "No merge strategy handled the merge."
+       case "$use_strategies" in
+       ?*' '?*)
+               echo >&2 "No merge strategy handled the merge."
+               ;;
+       *)
+               echo >&2 "Merge with strategy $use_strategies failed."
+               ;;
+       esac
        exit 2
        ;;
 "$wt_strategy")