Use sigaction and SA_RESTART in read-tree.c; add option in Makefile.

diff --git a/git-merge.sh b/git-merge.sh
index e50fbb1160ad6ccfebc0d65fcc54bc3488e597cd..c258ea78bcd5dc944155b629ef429de247a6bac5 100755 (executable)
--- a/git-merge.sh
+++ b/git-merge.sh
@@ -130,7 +130,7 @@ case "$#,$common,$no_commit" in
        echo "Updating from $head to $1."
        git-update-index --refresh 2>/dev/null
        new_head=$(git-rev-parse --verify "$1^0") &&
-       git-read-tree -u -m $head "$new_head" &&
+       git-read-tree -u -v -m $head "$new_head" &&
        finish "$new_head" "Fast forward"
        dropsave
        exit 0
@@ -142,9 +142,11 @@ case "$#,$common,$no_commit" in
 1,*,)
        # We are not doing octopus, not fast forward, and have only
        # one common.  See if it is really trivial.
+       git var GIT_COMMITTER_IDENT >/dev/null || exit
+
        echo "Trying really trivial in-index merge..."
        git-update-index --refresh 2>/dev/null
-       if git-read-tree --trivial -m -u $common $head "$1" &&
+       if git-read-tree --trivial -m -u -v $common $head "$1" &&
           result_tree=$(git-write-tree)
        then
            echo "Wonderful."
@@ -179,6 +181,9 @@ case "$#,$common,$no_commit" in
        ;;
 esac
 
+# We are going to make a new commit.
+git var GIT_COMMITTER_IDENT >/dev/null || exit
+
 case "$use_strategies" in
 '')
        case "$#" in
@@ -209,6 +214,7 @@ case "$use_strategies" in
 esac
 
 result_tree= best_cnt=-1 best_strategy= wt_strategy=
+merge_was_ok=
 for strategy in $use_strategies
 do
     test "$wt_strategy" = '' || {
@@ -228,6 +234,7 @@ do
     exit=$?
     if test "$no_commit" = t && test "$exit" = 0
     then
+        merge_was_ok=t
        exit=1 ;# pretend it left conflicts.
     fi
 
@@ -291,6 +298,25 @@ for remote
 do
        echo $remote
 done >"$GIT_DIR/MERGE_HEAD"
-echo $merge_msg >"$GIT_DIR/MERGE_MSG"
+echo "$merge_msg" >"$GIT_DIR/MERGE_MSG"
 
-die "Automatic merge failed/prevented; fix up by hand"
+if test "$merge_was_ok" = t
+then
+       echo >&2 \
+       "Automatic merge went well; stopped before committing as requested"
+       exit 0
+else
+       {
+           echo '
+Conflicts:
+'
+               git ls-files --unmerged |
+               sed -e 's/^[^   ]*      /       /' |
+               uniq
+       } >>"$GIT_DIR/MERGE_MSG"
+       if test -d "$GIT_DIR/rr-cache"
+       then
+               git-rerere
+       fi
+       die "Automatic merge failed; fix up by hand"
+fi