Merge branch 'jc/advice-about-to-lose-commit'

diff --git a/git-mergetool.sh b/git-mergetool.sh
index bacbda2bb75854235b912903c7e45fc94d38e719..3aab5aae844b963fc4178675a56da20e02488dfd 100755 (executable)
--- a/git-mergetool.sh
+++ b/git-mergetool.sh
@@ -21,6 +21,10 @@ is_symlink () {
     test "$1" = 120000
 }
 
+is_submodule () {
+    test "$1" = 160000
+}
+
 local_present () {
     test -n "$local_mode"
 }
@@ -35,7 +39,8 @@ base_present () {
 
 cleanup_temp_files () {
     if test "$1" = --save-backup ; then
-       mv -- "$BACKUP" "$MERGED.orig"
+       rm -rf -- "$MERGED.orig"
+       test -e "$BACKUP" && mv -- "$BACKUP" "$MERGED.orig"
        rm -f -- "$LOCAL" "$REMOTE" "$BASE"
     else
        rm -f -- "$LOCAL" "$REMOTE" "$BASE" "$BACKUP"
@@ -52,11 +57,13 @@ describe_file () {
        echo "deleted"
     elif is_symlink "$mode" ; then
        echo "a symbolic link -> '$(cat "$file")'"
+    elif is_submodule "$mode" ; then
+       echo "submodule commit $file"
     else
        if base_present; then
-           echo "modified"
+           echo "modified file"
        else
-           echo "created"
+           echo "created file"
        fi
     fi
 }
@@ -112,6 +119,67 @@ resolve_deleted_merge () {
        done
 }
 
+resolve_submodule_merge () {
+    while true; do
+       printf "Use (l)ocal or (r)emote, or (a)bort? "
+       read ans
+       case "$ans" in
+           [lL]*)
+               if ! local_present; then
+                   if test -n "$(git ls-tree HEAD -- "$MERGED")"; then
+                       # Local isn't present, but it's a subdirectory
+                       git ls-tree --full-name -r HEAD -- "$MERGED" | git update-index --index-info || exit $?
+                   else
+                       test -e "$MERGED" && mv -- "$MERGED" "$BACKUP"
+                       git update-index --force-remove "$MERGED"
+                       cleanup_temp_files --save-backup
+                   fi
+               elif is_submodule "$local_mode"; then
+                   stage_submodule "$MERGED" "$local_sha1"
+               else
+                   git checkout-index -f --stage=2 -- "$MERGED"
+                   git add -- "$MERGED"
+               fi
+               return 0
+               ;;
+           [rR]*)
+               if ! remote_present; then
+                   if test -n "$(git ls-tree MERGE_HEAD -- "$MERGED")"; then
+                       # Remote isn't present, but it's a subdirectory
+                       git ls-tree --full-name -r MERGE_HEAD -- "$MERGED" | git update-index --index-info || exit $?
+                   else
+                       test -e "$MERGED" && mv -- "$MERGED" "$BACKUP"
+                       git update-index --force-remove "$MERGED"
+                   fi
+               elif is_submodule "$remote_mode"; then
+                   ! is_submodule "$local_mode" && test -e "$MERGED" && mv -- "$MERGED" "$BACKUP"
+                   stage_submodule "$MERGED" "$remote_sha1"
+               else
+                   test -e "$MERGED" && mv -- "$MERGED" "$BACKUP"
+                   git checkout-index -f --stage=3 -- "$MERGED"
+                   git add -- "$MERGED"
+               fi
+               cleanup_temp_files --save-backup
+               return 0
+               ;;
+           [aA]*)
+               return 1
+               ;;
+           esac
+       done
+}
+
+stage_submodule () {
+    path="$1"
+    submodule_sha1="$2"
+    mkdir -p "$path" || die "fatal: unable to create directory for module at $path"
+    # Find $path relative to work tree
+    work_tree_root=$(cd_to_toplevel && pwd)
+    work_rel_path=$(cd "$path" && GIT_WORK_TREE="${work_tree_root}" git rev-parse --show-prefix)
+    test -n "$work_rel_path" || die "fatal: unable to get path of module $path relative to work tree"
+    git update-index --add --replace --cacheinfo 160000 "$submodule_sha1" "${work_rel_path%/}" || die
+}
+
 checkout_staged_file () {
     tmpfile=$(expr "$(git checkout-index --temp --stage="$1" "$2")" : '\([^    ]*\)    ')
 
@@ -139,13 +207,23 @@ merge_file () {
     REMOTE="./$MERGED.REMOTE.$ext"
     BASE="./$MERGED.BASE.$ext"
 
-    mv -- "$MERGED" "$BACKUP"
-    cp -- "$BACKUP" "$MERGED"
-
     base_mode=$(git ls-files -u -- "$MERGED" | awk '{if ($3==1) print $1;}')
     local_mode=$(git ls-files -u -- "$MERGED" | awk '{if ($3==2) print $1;}')
     remote_mode=$(git ls-files -u -- "$MERGED" | awk '{if ($3==3) print $1;}')
 
+    if is_submodule "$local_mode" || is_submodule "$remote_mode"; then
+       echo "Submodule merge conflict for '$MERGED':"
+       local_sha1=$(git ls-files -u -- "$MERGED" | awk '{if ($3==2) print $2;}')
+       remote_sha1=$(git ls-files -u -- "$MERGED" | awk '{if ($3==3) print $2;}')
+       describe_file "$local_mode" "local" "$local_sha1"
+       describe_file "$remote_mode" "remote" "$remote_sha1"
+       resolve_submodule_merge
+       return
+    fi
+
+    mv -- "$MERGED" "$BACKUP"
+    cp -- "$BACKUP" "$MERGED"
+
     base_present   && checkout_staged_file 1 "$MERGED" "$BASE"
     local_present  && checkout_staged_file 2 "$MERGED" "$LOCAL"
     remote_present && checkout_staged_file 3 "$MERGED" "$REMOTE"