From 8d66417de3ae5081a51e54213f65b443f0b1fd9d Mon Sep 17 00:00:00 2001 From: Johannes Schindelin Date: Mon, 16 Feb 2009 21:52:51 +0100 Subject: [PATCH] Add a few more values for receive.denyCurrentBranch For a long time, this developer thought that Git's insistence that pushing into the current branch is evil was completely merited. Just for fun, the original patch tried to show people that Git is right there, and that it causes more trouble than it does good when Git allows you to try to update the working tree for fast-forwards, or to detach the HEAD, depending on some config settings. Surprisingly, the opposite was shown. So here is the support for two new options you can give the config variable receive.denyCurrentBranch: 'updateInstead': Try to merge the working tree with the new tip of the branch (which can lead to really horrible merge conflicts). 'detachInstead': Detach the HEAD, thereby avoiding a disagreement between the HEAD and the index (as well as the working tree), possibly leaving the local user wondering how on earth her HEAD became so detached. Signed-off-by: Johannes Schindelin --- Documentation/config.txt | 5 +++++ builtin/receive-pack.c | 58 ++++++++++++++++++++++++++++++++++++++++++++++-- t/t5516-fetch-push.sh | 36 ++++++++++++++++++++++++++++++ 3 files changed, 97 insertions(+), 2 deletions(-) diff --git a/Documentation/config.txt b/Documentation/config.txt index 724d79b8d5..3157340f3d 100644 --- a/Documentation/config.txt +++ b/Documentation/config.txt @@ -1644,6 +1644,11 @@ 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 760817dbd7..00f1d113cf 100644 --- a/builtin/receive-pack.c +++ b/builtin/receive-pack.c @@ -17,7 +17,9 @@ enum deny_action { DENY_UNCONFIGURED, DENY_IGNORE, DENY_WARN, - DENY_REFUSE + DENY_REFUSE, + DENY_UPDATE_INSTEAD, + DENY_DETACH_INSTEAD, }; static int deny_deletes; @@ -79,7 +81,12 @@ 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; } @@ -329,6 +336,44 @@ 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", make_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; @@ -355,6 +400,13 @@ 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; } } @@ -383,6 +435,8 @@ 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 d73731e644..eb6fce848f 100755 --- a/t/t5516-fetch-push.sh +++ b/t/t5516-fetch-push.sh @@ -782,4 +782,40 @@ test_expect_success 'push --porcelain --dry-run rejected' ' test_cmp .git/foo .git/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 -- 2.11.4.GIT