git-p4: use -m when running p4 changes

Simply running "p4 changes" on a large branch can result in a "too
many rows scanned" error from the Perforce server. It is better to
use a sequence of smaller calls to "p4 changes", using the "-m"
option to limit the size of each call.

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

1 files changed, 64 insertions, 0 deletions

diff --git a/t/t9818-git-p4-block.sh b/t/t9818-git-p4-block.sh
new file mode 100755
index 000000000..153b20afb
--- /dev/null
+++ b/t/t9818-git-p4-block.sh
@@ -0,0 +1,64 @@
+#!/bin/sh
+
+test_description='git p4 fetching changes in multiple blocks'
+
+. ./lib-git-p4.sh
+
+test_expect_success 'start p4d' '
+	start_p4d
+'
+
+test_expect_success 'Create a repo with ~100 changes' '
+	(
+		cd "$cli" &&
+		>file.txt &&
+		p4 add file.txt &&
+		p4 submit -d "Add file.txt" &&
+		for i in $(test_seq 0 9)
+		do
+			>outer$i.txt &&
+			p4 add outer$i.txt &&
+			p4 submit -d "Adding outer$i.txt" &&
+			for j in $(test_seq 0 9)
+			do
+				p4 edit file.txt &&
+				echo $i$j >file.txt &&
+				p4 submit -d "Commit $i$j" || exit
+			done || exit
+		done
+	)
+'
+
+test_expect_success 'Clone the repo' '
+	git p4 clone --dest="$git" --changes-block-size=10 --verbose //depot@all
+'
+
+test_expect_success 'All files are present' '
+	echo file.txt >expected &&
+	test_write_lines outer0.txt outer1.txt outer2.txt outer3.txt outer4.txt >>expected &&
+	test_write_lines outer5.txt outer6.txt outer7.txt outer8.txt outer9.txt >>expected &&
+	ls "$git" >current &&
+	test_cmp expected current
+'
+
+test_expect_success 'file.txt is correct' '
+	echo 99 >expected &&
+	test_cmp expected "$git/file.txt"
+'
+
+test_expect_success 'Correct number of commits' '
+	(cd "$git" && git log --oneline) >log &&
+	test_line_count = 111 log
+'
+
+test_expect_success 'Previous version of file.txt is correct' '
+	(cd "$git" && git checkout HEAD^^) &&
+	echo 97 >expected &&
+	test_cmp expected "$git/file.txt"
+'
+
+test_expect_success 'kill p4d' '
+	kill_p4d
+'
+
+test_done