git-p4: add unshelve command

This can be used to "unshelve" a shelved P4 commit into
a git commit.

For example:

  $ git p4 unshelve 12345

The resulting commit ends up in the branch:
   refs/remotes/p4/unshelved/12345

If that branch already exists, it is renamed - for example
the above branch would be saved as p4/unshelved/12345.1.

git-p4 checks that the shelved changelist is based on files
which are at the same Perforce revision as the origin branch
being used for the unshelve (HEAD by default). If they are not,
it will refuse to unshelve. This is to ensure that the unshelved
change does not contain other changes mixed-in.

The reference branch can be changed manually with the "--origin"
option.

The change adds a new Unshelve command class. This just runs the
existing P4Sync code tweaked to handle a shelved changelist.

Signed-off-by: Luke Diamand <luke@diamand.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 138 insertions, 0 deletions

diff --git a/t/t9832-unshelve.sh b/t/t9832-unshelve.sh
new file mode 100755
index 0000000..48ec767
--- /dev/null
+++ b/t/t9832-unshelve.sh
@@ -0,0 +1,138 @@
+#!/bin/sh
+
+last_shelved_change () {
+	p4 changes -s shelved -m1 | cut -d " " -f 2
+}
+
+test_description='git p4 unshelve'
+
+. ./lib-git-p4.sh
+
+test_expect_success 'start p4d' '
+	start_p4d
+'
+
+test_expect_success 'init depot' '
+	(
+		cd "$cli" &&
+		echo file1 >file1 &&
+		p4 add file1 &&
+		p4 submit -d "change 1" &&
+		: >file_to_delete &&
+		p4 add file_to_delete &&
+		p4 submit -d "file to delete"
+	)
+'
+
+test_expect_success 'initial clone' '
+	git p4 clone --dest="$git" //depot/@all
+'
+
+test_expect_success 'create shelved changelist' '
+	(
+		cd "$cli" &&
+		p4 edit file1 &&
+		echo "a change" >>file1 &&
+		echo "new file" >file2 &&
+		p4 add file2 &&
+		p4 delete file_to_delete &&
+		p4 opened &&
+		p4 shelve -i <<EOF
+Change: new
+Description:
+	Test commit
+
+	Further description
+Files:
+	//depot/file1
+	//depot/file2
+	//depot/file_to_delete
+EOF
+
+	) &&
+	(
+		cd "$git" &&
+		change=$(last_shelved_change) &&
+		git p4 unshelve $change &&
+		git show refs/remotes/p4/unshelved/$change | grep -q "Further description" &&
+		git cherry-pick refs/remotes/p4/unshelved/$change &&
+		test_path_is_file file2 &&
+		test_cmp file1 "$cli"/file1 &&
+		test_cmp file2 "$cli"/file2 &&
+		test_path_is_missing file_to_delete
+	)
+'
+
+test_expect_success 'update shelved changelist and re-unshelve' '
+	test_when_finished cleanup_git &&
+	(
+		cd "$cli" &&
+		change=$(last_shelved_change) &&
+		echo "file3" >file3 &&
+		p4 add -c $change file3 &&
+		p4 shelve -i -r <<EOF &&
+Change: $change
+Description:
+	Test commit
+
+	Further description
+Files:
+	//depot/file1
+	//depot/file2
+	//depot/file3
+	//depot/file_to_delete
+EOF
+		p4 describe $change
+	) &&
+	(
+		cd "$git" &&
+		change=$(last_shelved_change) &&
+		git p4 unshelve $change &&
+		git diff refs/remotes/p4/unshelved/$change.0 refs/remotes/p4/unshelved/$change | grep -q file3
+	)
+'
+
+# This is the tricky case where the shelved changelist base revision doesn't
+# match git-p4's idea of the base revision
+#
+# We will attempt to unshelve a change that is based on a change one commit
+# ahead of p4/master
+
+test_expect_success 'create shelved changelist based on p4 change ahead of p4/master' '
+	git p4 clone --dest="$git" //depot/@all &&
+	(
+		cd "$cli" &&
+		p4 revert ... &&
+		p4 edit file1 &&
+		echo "foo" >>file1 &&
+		p4 submit -d "change:foo" &&
+		p4 edit file1 &&
+		echo "bar" >>file1 &&
+		p4 shelve -i <<EOF &&
+Change: new
+Description:
+	Change to be unshelved
+Files:
+	//depot/file1
+EOF
+		change=$(last_shelved_change) &&
+		p4 describe -S $change | grep -q "Change to be unshelved"
+	)
+'
+
+# Now try to unshelve it. git-p4 should refuse to do so.
+test_expect_success 'try to unshelve the change' '
+	test_when_finished cleanup_git &&
+	(
+		change=$(last_shelved_change) &&
+		cd "$git" &&
+		test_must_fail git p4 unshelve $change 2>out.txt &&
+		grep -q "cannot unshelve" out.txt
+	)
+'
+
+test_expect_success 'kill p4d' '
+	kill_p4d
+'
+
+test_done