From f95ebf74296077d5fdccaa2668edc527841db521 Mon Sep 17 00:00:00 2001
From: Johannes Schindelin <Johannes.Schindelin@gmx.de>
Date: Fri, 4 Jul 2008 16:19:52 +0100
Subject: [PATCH] Allow cherry-picking root commits

A root commit couldn't be cherry-picked.  But its semantics can be
defined as simply merging two trees by overlaying disjoint parts
and merging overlapping files without any common ancestor.  You
should be able to rebase originally independent branches on top of
another branch by using this.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
 builtin-revert.c            | 26 ++++++++++++++++----------
 t/t3503-cherry-pick-root.sh | 30 ++++++++++++++++++++++++++++++
 2 files changed, 46 insertions(+), 10 deletions(-)
 create mode 100755 t/t3503-cherry-pick-root.sh

diff --git a/builtin-revert.c b/builtin-revert.c
index 0270f9b85a8229..f3d452418c25b0 100644
--- a/builtin-revert.c
+++ b/builtin-revert.c
@@ -206,6 +206,7 @@ static int merge_recursive(const char *base_sha1,
 {
 	char buffer[256];
 	const char *argv[6];
+	int i = 0;
 
 	sprintf(buffer, "GITHEAD_%s", head_sha1);
 	setenv(buffer, head_name, 1);
@@ -218,12 +219,13 @@ static int merge_recursive(const char *base_sha1,
 	 * and $prev on top of us (when reverting), or the change between
 	 * $prev and $commit on top of us (when cherry-picking or replaying).
 	 */
-	argv[0] = "merge-recursive";
-	argv[1] = base_sha1;
-	argv[2] = "--";
-	argv[3] = head_sha1;
-	argv[4] = next_sha1;
-	argv[5] = NULL;
+	argv[i++] = "merge-recursive";
+	if (base_sha1)
+		argv[i++] = base_sha1;
+	argv[i++] = "--";
+	argv[i++] = head_sha1;
+	argv[i++] = next_sha1;
+	argv[i++] = NULL;
 
 	return run_command_v_opt(argv, RUN_COMMAND_NO_STDIN | RUN_GIT_CMD);
 }
@@ -297,9 +299,12 @@ static int revert_or_cherry_pick(int argc, const char **argv)
 		discard_cache();
 	}
 
-	if (!commit->parents)
-		die ("Cannot %s a root commit", me);
-	if (commit->parents->next) {
+	if (!commit->parents) {
+		if (action == REVERT)
+			die ("Cannot revert a root commit");
+		parent = NULL;
+	}
+	else if (commit->parents->next) {
 		/* Reverting or cherry-picking a merge commit */
 		int cnt;
 		struct commit_list *p;
@@ -368,7 +373,8 @@ static int revert_or_cherry_pick(int argc, const char **argv)
 		}
 	}
 
-	if (merge_recursive(sha1_to_hex(base->object.sha1),
+	if (merge_recursive(base == NULL ?
+				NULL : sha1_to_hex(base->object.sha1),
 				sha1_to_hex(head), "HEAD",
 				sha1_to_hex(next->object.sha1), oneline) ||
 			write_cache_as_tree(head, 0, NULL)) {
diff --git a/t/t3503-cherry-pick-root.sh b/t/t3503-cherry-pick-root.sh
new file mode 100755
index 00000000000000..b0faa299183df5
--- /dev/null
+++ b/t/t3503-cherry-pick-root.sh
@@ -0,0 +1,30 @@
+#!/bin/sh
+
+test_description='test cherry-picking a root commit'
+
+. ./test-lib.sh
+
+test_expect_success setup '
+
+	echo first > file1 &&
+	git add file1 &&
+	test_tick &&
+	git commit -m "first" &&
+
+	git symbolic-ref HEAD refs/heads/second &&
+	rm .git/index file1 &&
+	echo second > file2 &&
+	git add file2 &&
+	test_tick &&
+	git commit -m "second"
+
+'
+
+test_expect_success 'cherry-pick a root commit' '
+
+	git cherry-pick master &&
+	test first = $(cat file1)
+
+'
+
+test_done