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-rw-r--r--Documentation/config.txt7
-rw-r--r--Documentation/git-init-db.txt4
-rw-r--r--Documentation/git-receive-pack.txt2
-rwxr-xr-xt/t5400-send-pack.sh14
4 files changed, 27 insertions, 0 deletions
diff --git a/Documentation/config.txt b/Documentation/config.txt
index 844cae4cf0..bb2fbc324e 100644
--- a/Documentation/config.txt
+++ b/Documentation/config.txt
@@ -267,3 +267,10 @@ whatchanged.difftree::
imap::
The configuration variables in the 'imap' section are described
in gitlink:git-imap-send[1].
+
+receive.denyNonFastforwads::
+ If set to true, git-receive-pack will deny a ref update which is
+ not a fast forward. Use this to prevent such an update via a push,
+ even if that push is forced. This configuration variable is
+ set when initializing a shared repository.
+
diff --git a/Documentation/git-init-db.txt b/Documentation/git-init-db.txt
index 63cd5dab3f..ca7d09dc0a 100644
--- a/Documentation/git-init-db.txt
+++ b/Documentation/git-init-db.txt
@@ -48,6 +48,10 @@ is given:
- 'all' (or 'world' or 'everybody'): Same as 'group', but make the repository
readable by all users.
+By default, the configuration flag receive.denyNonFastforward is enabled
+in shared repositories, so that you cannot force a non fast-forwarding push
+into it.
+
--
diff --git a/Documentation/git-receive-pack.txt b/Documentation/git-receive-pack.txt
index f9457d45ed..0dfadc2a32 100644
--- a/Documentation/git-receive-pack.txt
+++ b/Documentation/git-receive-pack.txt
@@ -73,6 +73,8 @@ packed and is served via a dumb transport.
There are other real-world examples of using update and
post-update hooks found in the Documentation/howto directory.
+git-receive-pack honours the receive.denyNonFastforwards flag, which
+tells it if updates to a ref should be denied if they are not fast-forwards.
OPTIONS
-------
diff --git a/t/t5400-send-pack.sh b/t/t5400-send-pack.sh
index f3694ac3c7..8afb899717 100755
--- a/t/t5400-send-pack.sh
+++ b/t/t5400-send-pack.sh
@@ -64,4 +64,18 @@ test_expect_success \
cmp victim/.git/refs/heads/master .git/refs/heads/master
'
+unset GIT_CONFIG GIT_CONFIG_LOCAL
+HOME=`pwd`/no-such-directory
+export HOME ;# this way we force the victim/.git/config to be used.
+
+test_expect_success \
+ 'pushing with --force should be denied with denyNonFastforwards' '
+ cd victim &&
+ git-repo-config receive.denyNonFastforwards true &&
+ cd .. &&
+ git-update-ref refs/heads/master master^ &&
+ git-send-pack --force ./victim/.git/ master &&
+ ! diff -u .git/refs/heads/master victim/.git/refs/heads/master
+'
+
test_done