git-commit-vandalism/t/t5401-update-hooks.sh
Shawn O. Pearce 05ef58ec1f Teach receive-pack to run pre-receive/post-receive hooks
Bill Lear pointed out that it is easy to send out notifications of
changes with the update hook, but successful execution of the update
hook does not necessarily mean that the ref was actually updated.
Lock contention on the ref or being unable to append to the reflog
may prevent the ref from being changed.  Sending out notifications
prior to the ref actually changing is very misleading.

To help this situation I am introducing two new hooks to the
receive-pack flow: pre-receive and post-receive.  These new hooks
are invoked only once per receive-pack execution and are passed
three arguments per ref (refname, old-sha1, new-sha1).

The new post-receive hook is ideal for sending out notifications,
as it has the complete list of all refnames that were successfully
updated as well as the old and new SHA-1 values.  This allows more
interesting notifications to be sent.  Multiple ref updates could
be easily summarized into one email, for example.

The new pre-receive hook is ideal for logging update attempts, as it
is run only once for the entire receive-pack operation.  It can also
be used to verify multiple updates happen at once, e.g. an update
to the `maint` head must also be accompained by a new annotated tag.

Lots of documentation improvements for receive-pack are included
in this change, as we want to make sure the new hooks are clearly
explained.

Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>
2007-03-07 15:03:33 -08:00

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#!/bin/sh
#
# Copyright (c) 2006 Shawn O. Pearce
#
test_description='Test the update hook infrastructure.'
. ./test-lib.sh
test_expect_success setup '
echo This is a test. >a &&
git-update-index --add a &&
tree0=$(git-write-tree) &&
commit0=$(echo setup | git-commit-tree $tree0) &&
echo We hope it works. >a &&
git-update-index a &&
tree1=$(git-write-tree) &&
commit1=$(echo modify | git-commit-tree $tree1 -p $commit0) &&
git-update-ref refs/heads/master $commit0 &&
git-update-ref refs/heads/tofail $commit1 &&
git-clone ./. victim &&
GIT_DIR=victim/.git git-update-ref refs/heads/tofail $commit1 &&
git-update-ref refs/heads/master $commit1 &&
git-update-ref refs/heads/tofail $commit0
'
cat >victim/.git/hooks/pre-receive <<'EOF'
#!/bin/sh
echo "$@" >>$GIT_DIR/pre-receive.args
read x; printf "$x" >$GIT_DIR/pre-receive.stdin
echo STDOUT pre-receive
echo STDERR pre-receive >&2
EOF
chmod u+x victim/.git/hooks/pre-receive
cat >victim/.git/hooks/update <<'EOF'
#!/bin/sh
echo "$@" >>$GIT_DIR/update.args
read x; printf "$x" >$GIT_DIR/update.stdin
echo STDOUT update $1
echo STDERR update $1 >&2
test "$1" = refs/heads/master || exit
EOF
chmod u+x victim/.git/hooks/update
cat >victim/.git/hooks/post-receive <<'EOF'
#!/bin/sh
echo "$@" >>$GIT_DIR/post-receive.args
read x; printf "$x" >$GIT_DIR/post-receive.stdin
echo STDOUT post-receive
echo STDERR post-receive >&2
EOF
chmod u+x victim/.git/hooks/post-receive
cat >victim/.git/hooks/post-update <<'EOF'
#!/bin/sh
echo "$@" >>$GIT_DIR/post-update.args
read x; printf "$x" >$GIT_DIR/post-update.stdin
echo STDOUT post-update
echo STDERR post-update >&2
EOF
chmod u+x victim/.git/hooks/post-update
test_expect_failure push '
git-send-pack --force ./victim/.git master tofail >send.out 2>send.err
'
test_expect_success 'updated as expected' '
test $(GIT_DIR=victim/.git git-rev-parse master) = $commit1 &&
test $(GIT_DIR=victim/.git git-rev-parse tofail) = $commit1
'
test_expect_success 'hooks ran' '
test -f victim/.git/pre-receive.args &&
test -f victim/.git/pre-receive.stdin &&
test -f victim/.git/update.args &&
test -f victim/.git/update.stdin &&
test -f victim/.git/post-receive.args &&
test -f victim/.git/post-receive.stdin &&
test -f victim/.git/post-update.args &&
test -f victim/.git/post-update.stdin
'
test_expect_success 'pre-receive hook arguments' '
echo \
refs/heads/master $commit0 $commit1 \
refs/heads/tofail $commit1 $commit0 \
| diff - victim/.git/pre-receive.args
'
test_expect_success 'update hook arguments' '
(echo refs/heads/master $commit0 $commit1;
echo refs/heads/tofail $commit1 $commit0
) | diff - victim/.git/update.args
'
test_expect_success 'post-receive hook arguments' '
echo refs/heads/master $commit0 $commit1 |
diff - victim/.git/post-receive.args
'
test_expect_success 'post-update hook arguments' '
echo refs/heads/master |
diff -u - victim/.git/post-update.args
'
test_expect_success 'all hook stdin is /dev/null' '
! test -s victim/.git/pre-receive.stdin &&
! test -s victim/.git/update.stdin &&
! test -s victim/.git/post-receive.stdin &&
! test -s victim/.git/post-update.stdin
'
test_expect_failure 'send-pack produced no output' '
test -s send.out
'
cat <<EOF >expect
STDOUT pre-receive
STDERR pre-receive
STDOUT update refs/heads/master
STDERR update refs/heads/master
STDOUT update refs/heads/tofail
STDERR update refs/heads/tofail
STDOUT post-receive
STDERR post-receive
STDOUT post-update
STDERR post-update
EOF
test_expect_success 'send-pack stderr contains hook messages' '
egrep ^STD send.err >actual &&
diff - actual <expect
'
test_done