push: disallow --all and refspecs when remote.<name>.mirror is set

Pushes with --all, or refspecs are disallowed when --mirror is given
to 'git push', or when 'remote.<name>.mirror' is set in the config of
the repository, because they can have surprising
effects. 800a4ab399 ("push: check for errors earlier", 2018-05-16)
refactored this code to do that check earlier, so we can explicitly
check for the presence of flags, instead of their sideeffects.

However when 'remote.<name>.mirror' is set in the config, the
TRANSPORT_PUSH_MIRROR flag would only be set after we calling
'do_push()', so the checks would miss it entirely.

This leads to surprises for users [*1*].

Fix this by making sure we set the flag (if appropriate) before
checking for compatibility of the various options.

*1*: https://twitter.com/FiloSottile/status/1163918701462249472

Reported-by: Filippo Valsorda <filippo@ml.filippo.io>
Helped-by: Saleem Rashid
Signed-off-by: Thomas Gummerer <t.gummerer@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/builtin/push.c b/builtin/push.c
index 8bb8a0849ba90aff5d295acc3894b2034cbbdef2..5896bde06ceabcad33b21aeb94c48d6395491ef2 100644 (file)
--- a/builtin/push.c
+++ b/builtin/push.c
@@ -382,30 +382,14 @@ static int push_with_options(struct transport *transport, struct refspec *rs,
 }
 
 static int do_push(const char *repo, int flags,
-                  const struct string_list *push_options)
+                  const struct string_list *push_options,
+                  struct remote *remote)
 {
        int i, errs;
-       struct remote *remote = pushremote_get(repo);
        const char **url;
        int url_nr;
        struct refspec *push_refspec = &rs;
 
-       if (!remote) {
-               if (repo)
-                       die(_("bad repository '%s'"), repo);
-               die(_("No configured push destination.\n"
-                   "Either specify the URL from the command-line or configure a remote repository using\n"
-                   "\n"
-                   "    git remote add <name> <url>\n"
-                   "\n"
-                   "and then push using the remote name\n"
-                   "\n"
-                   "    git push <name>\n"));
-       }
-
-       if (remote->mirror)
-               flags |= (TRANSPORT_PUSH_MIRROR|TRANSPORT_PUSH_FORCE);
-
        if (push_options->nr)
                flags |= TRANSPORT_PUSH_OPTIONS;
 
@@ -545,6 +529,7 @@ int cmd_push(int argc, const char **argv, const char *prefix)
        struct string_list push_options_cmdline = STRING_LIST_INIT_DUP;
        struct string_list *push_options;
        const struct string_list_item *item;
+       struct remote *remote;
 
        struct option options[] = {
                OPT__VERBOSITY(&verbosity),
@@ -599,20 +584,6 @@ int cmd_push(int argc, const char **argv, const char *prefix)
                die(_("--delete is incompatible with --all, --mirror and --tags"));
        if (deleterefs && argc < 2)
                die(_("--delete doesn't make sense without any refs"));
-       if (flags & TRANSPORT_PUSH_ALL) {
-               if (tags)
-                       die(_("--all and --tags are incompatible"));
-               if (argc >= 2)
-                       die(_("--all can't be combined with refspecs"));
-       }
-       if (flags & TRANSPORT_PUSH_MIRROR) {
-               if (tags)
-                       die(_("--mirror and --tags are incompatible"));
-               if (argc >= 2)
-                       die(_("--mirror can't be combined with refspecs"));
-       }
-       if ((flags & TRANSPORT_PUSH_ALL) && (flags & TRANSPORT_PUSH_MIRROR))
-               die(_("--all and --mirror are incompatible"));
 
        if (recurse_submodules == RECURSE_SUBMODULES_CHECK)
                flags |= TRANSPORT_RECURSE_SUBMODULES_CHECK;
@@ -629,11 +600,43 @@ int cmd_push(int argc, const char **argv, const char *prefix)
                set_refspecs(argv + 1, argc - 1, repo);
        }
 
+       remote = pushremote_get(repo);
+       if (!remote) {
+               if (repo)
+                       die(_("bad repository '%s'"), repo);
+               die(_("No configured push destination.\n"
+                   "Either specify the URL from the command-line or configure a remote repository using\n"
+                   "\n"
+                   "    git remote add <name> <url>\n"
+                   "\n"
+                   "and then push using the remote name\n"
+                   "\n"
+                   "    git push <name>\n"));
+       }
+
+       if (remote->mirror)
+               flags |= (TRANSPORT_PUSH_MIRROR|TRANSPORT_PUSH_FORCE);
+
+       if (flags & TRANSPORT_PUSH_ALL) {
+               if (tags)
+                       die(_("--all and --tags are incompatible"));
+               if (argc >= 2)
+                       die(_("--all can't be combined with refspecs"));
+       }
+       if (flags & TRANSPORT_PUSH_MIRROR) {
+               if (tags)
+                       die(_("--mirror and --tags are incompatible"));
+               if (argc >= 2)
+                       die(_("--mirror can't be combined with refspecs"));
+       }
+       if ((flags & TRANSPORT_PUSH_ALL) && (flags & TRANSPORT_PUSH_MIRROR))
+               die(_("--all and --mirror are incompatible"));
+
        for_each_string_list_item(item, push_options)
                if (strchr(item->string, '\n'))
                        die(_("push options must not have new line characters"));
 
-       rc = do_push(repo, flags, push_options);
+       rc = do_push(repo, flags, push_options, remote);
        string_list_clear(&push_options_cmdline, 0);
        string_list_clear(&push_options_config, 0);
        if (rc == -1)

diff --git a/t/t5517-push-mirror.sh b/t/t5517-push-mirror.sh
index c05a661400c10cb7574173b34116362d501481ce..e4edd56404fe636600e3f32eef754c7fb4b6b639 100755 (executable)
--- a/t/t5517-push-mirror.sh
+++ b/t/t5517-push-mirror.sh
@@ -265,4 +265,14 @@ test_expect_success 'remote.foo.mirror=no has no effect' '
 
 '
 
+test_expect_success 'push to mirrored repository with refspec fails' '
+       mk_repo_pair &&
+       (
+               cd master &&
+               echo one >foo && git add foo && git commit -m one &&
+               git config --add remote.up.mirror true &&
+               test_must_fail git push up master
+       )
+'
+
 test_done