upload-pack: add a trigger for post-upload-pack hook

After upload-pack successfully finishes its operation, post-upload-pack
hook can be called for logging purposes.

The hook is passed various pieces of information, one per line, from its
standard input.  Currently the following items can be fed to the hook, but
more types of information may be added in the future:

    want SHA-1::
        40-byte hexadecimal object name the client asked to include in the
        resulting pack.  Can occur one or more times in the input.

    have SHA-1::
        40-byte hexadecimal object name the client asked to exclude from
        the resulting pack, claiming to have them already.  Can occur zero
        or more times in the input.

    time float::
        Number of seconds spent for creating the packfile.

    size decimal::
        Size of the resulting packfile in bytes.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 49 insertions, 0 deletions

diff --git a/t/t5501-post-upload-pack.sh b/t/t5501-post-upload-pack.sh
new file mode 100755
index 000000000..47ee7b503
--- /dev/null
+++ b/t/t5501-post-upload-pack.sh
@@ -0,0 +1,49 @@
+#!/bin/sh
+
+test_description='post upload-hook'
+
+. ./test-lib.sh
+
+LOGFILE=".git/post-upload-pack-log"
+
+test_expect_success setup '
+	test_commit A &&
+	test_commit B &&
+	git reset --hard A &&
+	test_commit C &&
+	git branch prev B &&
+	mkdir -p .git/hooks &&
+	{
+		echo "#!$SHELL_PATH" &&
+		echo "cat >post-upload-pack-log"
+	} >".git/hooks/post-upload-pack" &&
+	chmod +x .git/hooks/post-upload-pack
+'
+
+test_expect_success initial '
+	rm -fr sub &&
+	git init sub &&
+	(
+		cd sub &&
+		git fetch --no-tags .. prev
+	) &&
+	want=$(sed -n "s/^want //p" "$LOGFILE") &&
+	test "$want" = "$(git rev-parse --verify B)" &&
+	! grep "^have " "$LOGFILE"
+'
+
+test_expect_success second '
+	rm -fr sub &&
+	git init sub &&
+	(
+		cd sub &&
+		git fetch --no-tags .. prev:refs/remotes/prev &&
+		git fetch --no-tags .. master
+	) &&
+	want=$(sed -n "s/^want //p" "$LOGFILE") &&
+	test "$want" = "$(git rev-parse --verify C)" &&
+	have=$(sed -n "s/^have //p" "$LOGFILE") &&
+	test "$have" = "$(git rev-parse --verify B)"
+'
+
+test_done