Worktrees can be made from bare repositories #4630

tiennou · 2018-04-18T22:54:01Z

Supersedes #4628, fixes #4626.

It fixes the issue by globally disabling the check in ensure_not_bare when working against a "worktree repo". I haven't given any thought to what this actually can provoke.

My gut feeling says it's not clean enough, as I don't like :

all those remaining repo->is_bare tests which might now not work against a "worktree repo".
you can have bare repo (git_repository_is_bare = true) with a workdir, since the bare-ness of the parent repo percolates down to the worktree repoes.

Maybe renaming ensure_not_bare to ensure_has_workdir and using that everywhere ? I'm unsure about the 2nd point though. Opinions, as always, welcome.

tiennou · 2018-04-19T08:19:34Z

tests/worktree/worktree.c

+	repo = cl_git_sandbox_init("testrepo.git");
+
+	cl_assert_equal_i(1, git_repository_is_bare(repo));
+	cl_assert_equal_i(0, git_repository_is_worktree(repo));


I am aware of that. Right now I feel that we have bigger concerns than testing a single bool OR-ing function vs. all its others users that can now work against those bare-worktrees. Especially since the semantics are unclear.

csware · 2018-04-19T08:06:16Z

tests/worktree/worktree.c

+	cl_git_pass(git_repository_open(&wtrepo, path.ptr));
+	cl_assert_equal_i(1, git_repository_is_bare(wtrepo));
+	cl_assert_equal_i(1, git_repository_is_worktree(wtrepo));
+


git_repository__ensure_not_bare should be tested again on repo to make sure that adding a worktree to a bare repository does not change the return value on the bare repository.

Note that because of the semantic change in git_repository_is_bare, git_repository__ensure_not_bare now has the same semantics by default. So apart from the special error handling, it's equivalent (and I think it's better to test the public low-level API part vs. a slightly higher-up private one).

ethomson · 2018-04-19T08:09:29Z

you can have bare repo (git_repository_is_bare = true) with a workdir, since the bare-ness of the parent repo percolates down to the worktree repoes.

To clarify: you're saying that if I have a bare parent repository, the subsequent worktree repository also identifies itself as bare? I don't think that's what I would have expected... if you add a working directory to a bare repository, it reports itself (correctly) as non-bare. I would expect worktree repositories created from a bare parent to do the same.

tiennou · 2018-04-19T08:16:05Z

The unexpectedness is shared then. Note that cd $worktree; git config --get core.bare returns "true", so git seems to consider the repository still bare. I expect our config code to do the same, but that is_bare function clearly does not.

I found one broken thing in git, adding a relative submodule to the worktree of a bare repository always "can't find directory $relative_path".

tiennou · 2018-04-19T08:19:34Z

tests/worktree/worktree.c

+	repo = cl_git_sandbox_init("testrepo.git");
+
+	cl_assert_equal_i(1, git_repository_is_bare(repo));
+	cl_assert_equal_i(0, git_repository_is_worktree(repo));


I am aware of that. Right now I feel that we have bigger concerns than testing a single bool OR-ing function vs. all its others users that can now work against those bare-worktrees. Especially since the semantics are unclear.

ethomson · 2018-04-19T08:28:36Z

The unexpectedness is shared then. Note that cd $worktree; git config --get core.bare returns "true", so git seems to consider the repository still bare. I expect our config code to do the same, but that is_bare function clearly does not.

git config --get core.bare is really only showing you the configuration option, which remains unchanged. If you query the repository configuration through libgit2, we should also report core.bare = true even when you've configured a working folder.

I think that git_repository_is_bare should report the conceptual / perceived bareness of a repository, not just be a direct proxy to the configuration. I don't think there's a parallel in git.git for this concept.

csware · 2018-04-19T10:45:03Z

src/worktree.c

@@ -139,7 +139,7 @@ static int open_worktree_dir(git_worktree **out, const char *parent, const char
 	if ((wt->name = git__strdup(name)) == NULL
 	    || (wt->commondir_path = git_worktree__read_link(dir, "commondir")) == NULL
 	    || (wt->gitlink_path = git_worktree__read_link(dir, "gitdir")) == NULL
-	    || (wt->parent_path = git__strdup(parent)) == NULL) {
+	    || (parent && (wt->parent_path = git__strdup(parent)) == NULL)) {


This also seems to fix #4625

tiennou · 2018-04-20T08:44:17Z

Updated. A repo created from a worktree will not be reported as bare anymore, and the override is done in load_config_data to repo->bare directly, so all call-sites will see it. I'm still trying to pinpoint what I'm breaking by allowing those worktrees to not have a parent, so it's still WIP.

pks-t

Thanks for this PR. This was an obvious oversight by myself, a working tree shouldn't be considered as bare. It might be that the Windows failures stem from your use of joinpath with relative directories and Unix path separators, even though I think it unlikely. I can't dive into that right now, but could do so later.

pks-t · 2018-04-20T09:40:39Z

src/repository.c

-	if (git_config_get_bool(&is_bare, config, "core.bare") < 0)
-		repo->is_bare = 0;
+	if (err != GIT_ENOTFOUND)
+		repo->is_bare = is_bare && !repo->is_worktree;


This definitely makes sense.

(Note to myself) the commit message should be We were previously conflating any error into GIT_ENOTFOUND, which might or might not be correct. This fixes the code so a config error is bubbled up, as well as preserving the semantics in the face of worktree-repositories.

pks-t · 2018-04-20T09:43:58Z

tests/worktree/worktree.c

+	cl_git_pass(git_repository_open(&wtrepo, path.ptr));
+	cl_assert_equal_i(1, git_repository_is_bare(wtrepo));
+	cl_assert_equal_i(1, git_repository_is_worktree(wtrepo));
+


pks-t · 2018-04-20T09:51:08Z

tests/worktree/worktree.c

+	cl_assert_equal_i(1, git_repository_is_bare(repo));
+	cl_assert_equal_i(0, git_repository_is_worktree(repo));
+
+	cl_git_pass(git_buf_joinpath(&path, repo->gitdir, "../worktree-frombare"));


You should be able to just use "./worktree-frombare" instead of assembling the path, as we always chdir into the test data directory.

csware · 2018-04-20T11:18:44Z

tests/worktree/worktree.c

+	git_repository *repo, *wtrepo;
+	git_buf path = GIT_BUF_INIT;
+
+	repo = cl_git_sandbox_init("testrepo.git");


Use another bare repository here (e.g., short_tag.git). This fixes the test issue on win32. I suppose the reason is that testrepo is already set up by setup_fixture_worktree.

We were previously conflating any error into GIT_ENOTFOUND, which might or might not be correct. This fixes the code so a config error is bubbled up, as well as preserving the semantics in the face of worktree-repositories

pks-t · 2018-05-07T12:06:32Z

I've rebased this branch and just wanted to push it when I ran the tests for a second time, but this time they failed. The problem is that you're actually adding the worktree-frombare repo outside of our sandbox -- the path of git_worktree_add is relative to cwd, not relative to the repository we're creating the worktree from.

I've fixed the test issue and conflict and pushed both to your branch.

pks-t · 2018-05-07T13:36:58Z

Thanks @tiennou!

tiennou · 2018-08-10T20:16:56Z

I've just hit that case locally, and was mightily confused 😉. So I looked this PR up and got even more confused by the backport-0.27.2 addition 👆(with the deletion only registering after I banged my
head around longer). Was that the de-backporting intentional ? It's just that OCGit is currently tracking 0.27 and this one's now MIA 😕.

pks-t · 2018-08-16T07:33:47Z

I honestly can't remember anymore. I'd be happy to include it in another bugfix release, though, so I'm tagging it for backport

csware suggested changes Apr 19, 2018

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tiennou commented Apr 19, 2018

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tiennou force-pushed the fix/worktree-from-bare branch 2 times, most recently from c1ae122 to f08f74d Compare April 20, 2018 08:39

pks-t requested changes Apr 20, 2018

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pks-t added backport-0.27.1 and removed backport-0.27.1 labels Apr 20, 2018

csware reviewed Apr 20, 2018

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tiennou force-pushed the fix/worktree-from-bare branch 2 times, most recently from d854991 to 68c0e0b Compare April 20, 2018 17:52

tiennou mentioned this pull request Apr 24, 2018

worktree: Add new git_worktree_name and git_worktree_path functions #4639

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pks-t approved these changes May 7, 2018

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repository: being a worktree means we're not really bare

c7964c2

We were previously conflating any error into GIT_ENOTFOUND, which might or might not be correct. This fixes the code so a config error is bubbled up, as well as preserving the semantics in the face of worktree-repositories

pks-t force-pushed the fix/worktree-from-bare branch from 68c0e0b to 44a505b Compare May 7, 2018 12:06

worktree: a worktree can be made from a bare repository

a82082d

pks-t force-pushed the fix/worktree-from-bare branch from 44a505b to a82082d Compare May 7, 2018 12:28

pks-t merged commit 81ea995 into libgit2:master May 7, 2018

tiennou deleted the fix/worktree-from-bare branch June 4, 2018 22:46

This was referenced Jun 18, 2018

Fix git_worktree_validate failing on bare repositories #4686

Merged

git_repository_path is incorrect for worktree from bare repo #4684

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pks-t added the backport-0.27.5 label Aug 16, 2018

tiennou mentioned this pull request Oct 1, 2018

segfautlt in git_worktree_lookup on bare repos #4822

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This was referenced Jan 29, 2019

feature request git_worktree_add commitish reference #4823

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git_worktree_lookup fails with "out of memory" on a bare repository #4625

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[Snyk] Upgrade nodegit from 0.4.1 to 0.26.4 saurabharch/Breezeblocks#1

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Worktrees can be made from bare repositories #4630

Worktrees can be made from bare repositories #4630

tiennou commented Apr 18, 2018

tiennou Apr 19, 2018

csware Apr 19, 2018

pks-t Apr 20, 2018

tiennou Apr 20, 2018

ethomson commented Apr 19, 2018

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Worktrees can be made from bare repositories #4630

Worktrees can be made from bare repositories #4630

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