config doc: elaborate on what transfer.fsckObjects does

avar · gitster · commit 456bab87b2e5 · 2018-07-27T11:36:05.000-07:00
The existing documentation led the user to believe that all we were
doing were basic reachability sanity checks, but that hasn't been true
for a very long time. Update the description to match reality, and
note the caveat that there's a quarantine for accepting pushes, but
not for fetching.

Also mention that the fsck checks for security issues, which was my
initial motivation for writing this fetch.fsck.* series.

Signed-off-by: Ævar Arnfjörð Bjarmason &lt;avarab@gmail.com&gt;
Signed-off-by: Junio C Hamano &lt;gitster@pobox.com&gt;
diff --git a/Documentation/config.txt b/Documentation/config.txt
@@ -3397,8 +3397,17 @@ transfer.fsckObjects::
 	Defaults to false.
 +
 When set, the fetch or receive will abort in the case of a malformed
-object or a broken link. The result of an abort are only dangling
-objects.
+object or a link to a nonexistent object. In addition, various other
+issues are checked for, including legacy issues (see `fsck.<msg-id>`),
+and potential security issues like the existence of a `.GIT` directory
+or a malicious `.gitmodules` file (see the release notes for v2.2.1
+and v2.17.1 for details). Other sanity and security checks may be
+added in future releases.
++
+On the receiving side, failing fsckObjects will make those objects
+unreachable, see "QUARANTINE ENVIRONMENT" in
+linkgit:git-receive-pack[1]. On the fetch side, malformed objects will
+instead be left unreferenced in the repository.
 
 transfer.hideRefs::
 	String(s) `receive-pack` and `upload-pack` use to decide which
