diff --git a/Documentation/config.txt b/Documentation/config.txt index a6f38e6ca0..49a24e5fb2 100644 --- a/Documentation/config.txt +++ b/Documentation/config.txt @@ -1738,6 +1738,11 @@ receive.denyCurrentBranch:: print a warning of such a push to stderr, but allow the push to proceed. If set to false or "ignore", allow such pushes with no message. Defaults to "refuse". ++ +There are two more options that are meant for Git experts: "updateInstead" +which will run `read-tree -u -m HEAD` and "detachInstead" which will detach +the HEAD so it does not need to change. Both options come with their own +set of possible *complications*, but can be appropriate in rare workflows. receive.denyNonFastForwards:: If set to true, git-receive-pack will deny a ref update which is diff --git a/builtin/receive-pack.c b/builtin/receive-pack.c index 0afb8b2896..1b2bf5fe66 100644 --- a/builtin/receive-pack.c +++ b/builtin/receive-pack.c @@ -19,7 +19,9 @@ enum deny_action { DENY_UNCONFIGURED, DENY_IGNORE, DENY_WARN, - DENY_REFUSE + DENY_REFUSE, + DENY_UPDATE_INSTEAD, + DENY_DETACH_INSTEAD, }; static int deny_deletes; @@ -89,7 +91,12 @@ static int receive_pack_config(const char *var, const char *value, void *cb) } if (!strcmp(var, "receive.denycurrentbranch")) { - deny_current_branch = parse_deny_action(var, value); + if (value && !strcasecmp(value, "updateinstead")) + deny_current_branch = DENY_UPDATE_INSTEAD; + else if (value && !strcasecmp(value, "detachinstead")) + deny_current_branch = DENY_DETACH_INSTEAD; + else + deny_current_branch = parse_deny_action(var, value); return 0; } @@ -410,6 +417,44 @@ static void refuse_unconfigured_deny_delete_current(void) rp_error("%s", refuse_unconfigured_deny_delete_current_msg[i]); } +static void merge_worktree(unsigned char *sha1) +{ + const char *update_refresh[] = { + "update-index", "--refresh", NULL + }; + const char *read_tree[] = { + "read-tree", "-u", "-m", sha1_to_hex(sha1), NULL + }; + struct child_process child; + struct strbuf git_env = STRBUF_INIT; + const char *env[2]; + + if (is_bare_repository()) + die ("denyCurrentBranch = updateInstead needs a worktree"); + + strbuf_addf(&git_env, "GIT_DIR=%s", absolute_path(get_git_dir())); + env[0] = git_env.buf; + env[1] = NULL; + + memset(&child, 0, sizeof(child)); + child.argv = update_refresh; + child.env = env; + child.dir = git_work_tree_cfg ? git_work_tree_cfg : ".."; + child.stdout_to_stderr = 1; + child.git_cmd = 1; + if (run_command(&child)) + die ("Could not refresh the index"); + + child.argv = read_tree; + child.no_stdin = 1; + child.no_stdout = 1; + child.stdout_to_stderr = 0; + if (run_command(&child)) + die ("Could not merge working tree with new HEAD. Good luck."); + + strbuf_release(&git_env); +} + static const char *update(struct command *cmd) { const char *name = cmd->ref_name; @@ -441,6 +486,13 @@ static const char *update(struct command *cmd) if (deny_current_branch == DENY_UNCONFIGURED) refuse_unconfigured_deny(); return "branch is currently checked out"; + case DENY_UPDATE_INSTEAD: + merge_worktree(new_sha1); + break; + case DENY_DETACH_INSTEAD: + update_ref("push into current branch (detach)", "HEAD", + old_sha1, NULL, REF_NODEREF, DIE_ON_ERR); + break; } } @@ -469,6 +521,8 @@ static const char *update(struct command *cmd) refuse_unconfigured_deny_delete_current(); rp_error("refusing to delete the current branch: %s", name); return "deletion of the current branch prohibited"; + default: + die ("Invalid denyDeleteCurrent setting"); } } } diff --git a/t/t5516-fetch-push.sh b/t/t5516-fetch-push.sh index b5417cc951..2482796454 100755 --- a/t/t5516-fetch-push.sh +++ b/t/t5516-fetch-push.sh @@ -995,4 +995,40 @@ test_expect_success 'push --prune refspec' ' ! check_push_result $the_first_commit tmp/foo tmp/bar ' +test_expect_success 'receive.denyCurrentBranch = updateInstead' ' + git push testrepo master && + (cd testrepo && + git reset --hard && + git config receive.denyCurrentBranch updateInstead + ) && + test_commit third path2 && + git push testrepo master && + test $(git rev-parse HEAD) = $(cd testrepo && git rev-parse HEAD) && + test third = "$(cat testrepo/path2)" && + (cd testrepo && + git update-index --refresh && + git diff-files --quiet && + git diff-index --cached HEAD -- + ) +' + +test_expect_success 'receive.denyCurrentBranch = detachInstead' ' + (cd testrepo && + git reset --hard && + git config receive.denyCurrentBranch detachInstead + ) && + OLDHEAD=$(cd testrepo && git rev-parse HEAD) && + test_commit fourth path2 && + test fourth = "$(cat path2)" && + git push testrepo master && + test $OLDHEAD = $(cd testrepo && git rev-parse HEAD) && + test fourth != "$(cat testrepo/path2)" && + (cd testrepo && + test_must_fail git symbolic-ref HEAD && + git update-index --refresh && + git diff-files --quiet && + git diff-index --cached HEAD -- + ) +' + test_done