X-Git-Url: https://git.tokkee.org/?a=blobdiff_plain;f=git-am.sh;h=afe322b20fb0b40dfeb1cb17dc3cad09096e943a;hb=7768e27e1d3f3d5e253e795433033b5de1d1c157;hp=04f01194356ea0c91a01eed682b068c15e313ee6;hpb=f789f829933664dc4c3b0af7f1e2c5e37fc8621e;p=git.git

diff --git a/git-am.sh b/git-am.sh
index 04f011943..afe322b20 100755
--- a/git-am.sh
+++ b/git-am.sh
@@ -45,6 +45,12 @@ go_next () {
 	this=$next
 }
 
+cannot_fallback () {
+	echo "$1"
+	echo "Cannot fall back to three-way merge."
+	exit 1
+}
+
 fall_back_3way () {
     O_OBJECT=`cd "$GIT_OBJECT_DIRECTORY" && pwd`
 
@@ -52,19 +58,23 @@ fall_back_3way () {
     mkdir "$dotest/patch-merge-tmp-dir"
 
     # First see if the patch records the index info that we can use.
-    if git-apply -z --index-info "$dotest/patch" \
-	>"$dotest/patch-merge-index-info" 2>/dev/null &&
-	GIT_INDEX_FILE="$dotest/patch-merge-tmp-index" \
-	git-update-index -z --index-info <"$dotest/patch-merge-index-info" &&
-	GIT_INDEX_FILE="$dotest/patch-merge-tmp-index" \
-	git-write-tree >"$dotest/patch-merge-base+" &&
-	# index has the base tree now.
-	GIT_INDEX_FILE="$dotest/patch-merge-tmp-index" \
+    git-apply -z --index-info "$dotest/patch" \
+	>"$dotest/patch-merge-index-info" &&
+    GIT_INDEX_FILE="$dotest/patch-merge-tmp-index" \
+    git-update-index -z --index-info <"$dotest/patch-merge-index-info" &&
+    GIT_INDEX_FILE="$dotest/patch-merge-tmp-index" \
+    git-write-tree >"$dotest/patch-merge-base+" ||
+    cannot_fallback "Patch does not record usable index information."
+
+    echo Using index info to reconstruct a base tree...
+    if GIT_INDEX_FILE="$dotest/patch-merge-tmp-index" \
 	git-apply $binary --cached <"$dotest/patch"
     then
-	echo Using index info to reconstruct a base tree...
 	mv "$dotest/patch-merge-base+" "$dotest/patch-merge-base"
 	mv "$dotest/patch-merge-tmp-index" "$dotest/patch-merge-index"
+    else
+        cannot_fallback "Did you hand edit your patch?
+It does not apply to blobs recorded in its index."
     fi
 
     test -f "$dotest/patch-merge-index" &&
@@ -156,10 +166,25 @@ fi
 
 if test -d "$dotest"
 then
-	if test ",$#," != ",0," || ! tty -s
-	then
-		die "previous dotest directory $dotest still exists but mbox given."
-	fi
+	case "$#,$skip$resolved" in
+	0,*t*)
+		# Explicit resume command and we do not have file, so
+		# we are happy.
+		: ;;
+	0,)
+		# No file input but without resume parameters; catch
+		# user error to feed us a patch from standard input
+		# when there is already .dotest.  This is somewhat
+		# unreliable -- stdin could be /dev/null for example
+		# and the caller did not intend to feed us a patch but
+		# wanted to continue unattended.
+		tty -s
+		;;
+	*)
+		false
+		;;
+	esac ||
+	die "previous dotest directory $dotest still exists but mbox given."
 	resume=yes
 else
 	# Make sure we are not given --skip nor --resolved