notes: implement 'git notes copy --stdin'

This implements a mass-copy command that takes a sequence of lines in
the format

  <from-sha1> SP <to-sha1> [ SP <rest> ] LF

on stdin, and copies each <from-sha1>'s notes to the <to-sha1>.  The
<rest> is ignored.  The intent, of course, is that this can read the
same input that the 'post-rewrite' hook gets.

The copy_note() function is exposed for everyone's and in particular
the next commit's use.

Signed-off-by: Thomas Rast <trast@student.ethz.ch>
Acked-by: Johan Herland <johan@herland.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 34 insertions, 0 deletions

diff --git a/t/t3301-notes.sh b/t/t3301-notes.sh
index cb7166f6e..60ad6a167 100755
--- a/t/t3301-notes.sh
+++ b/t/t3301-notes.sh
@@ -776,4 +776,38 @@ test_expect_success 'cannot copy note from object without notes' '
 	test_must_fail git notes copy HEAD^ HEAD
 '
 
+cat > expect << EOF
+commit e5d4fb5698d564ab8c73551538ecaf2b0c666185
+Author: A U Thor <author@example.com>
+Date:   Thu Apr 7 15:25:13 2005 -0700
+
+    13th
+
+Notes (other):
+    yet another note
+$whitespace
+    yet another note
+
+commit 7038787dfe22a14c3867ce816dbba39845359719
+Author: A U Thor <author@example.com>
+Date:   Thu Apr 7 15:24:13 2005 -0700
+
+    12th
+
+Notes (other):
+    other note
+$whitespace
+    yet another note
+EOF
+
+test_expect_success 'git notes copy --stdin' '
+	(echo $(git rev-parse HEAD~3) $(git rev-parse HEAD^); \
+	echo $(git rev-parse HEAD~2) $(git rev-parse HEAD)) |
+	git notes copy --stdin &&
+	git log -2 > output &&
+	test_cmp expect output &&
+	test "$(git notes list HEAD)" = "$(git notes list HEAD~2)" &&
+	test "$(git notes list HEAD^)" = "$(git notes list HEAD~3)"
+'
+
 test_done