Only tests dealing with Git submodules care about the backend type.
Switching the tests to use the test backend also uncovered another bug
in `MergedTree`, so I fixed that too. The bug only happens with legacy
trees (path-level conflicts) and backends that care about the conflict
path, so it wouldn't happen with Git backends, and it wouldn't happen
at Google either (because we use tree-level conflicts).
I don't think there's any reason to use the local backend in tests
instead of using the stricter test backend.
I think we should generally use the test backend in tests and only use
the local backend or git backend when there's a particular reason to
do so (such as in `test_bad_locking` where the on-disk directory
structure matters). But this patch only deals with the simpler cases
where we were only testing with the local backend.
This fixes a bug where we used the parent directory's path when trying
read trees and files for a child entry. Many tests in
`test_merged_tree` fail after switching to the test backend there
without this fix/
It makes the call sites clearer if we pass the `TestRepoBackend` enum
instead of the boolean `use_git` value. It's also more extensible (I
plan to add another backend for tests).
I don't think there's much reason to run most tests with a `.git`
directory outside of `.jj`. I think it's just that way for historical
reasons. It's been that way since I added support for `.jj`-internal
repos in a8a9f7dedd.
The reason I want to switch is to make it a little easier to create
test repos for different backends. The problem with `.jj`-external git
repos is that they depend on an additional path.
I had to update `test_bad_locking.rs` to make the code merging
directories able handle missing directories on some side, because
git's loose objects result in directories getting created on one or
both sides.
I ran into some issues here when switching our tests to use
`.jj`-internal git repos. For example, the `std::fs::copy()` calls
started failing, which may be related to #2103. I think one problem is
that we could end up calling `merge_directories()` twice for the same
directory. This patch fixes that by deduping the paths we call with,
and makes the function assume that the output directory doesn't exist.
The main goal of this change is to enable tree-level conflict format, but it
also allows us to bulk-import commits on clone/init. I think a separate method
will help if we want to provide progress information, enable check for
.jjconflict entries under certain condition, etc.
Since git::import_refs() now depends on GitBackend type, it might be better to
remove git_repo from the function arguments.
Since e7e49527ef "git: ensure that remote branches never diverge", the last
known "refs/remotes" ref should be synced with the corresponding remote branch.
So we can always trust the branch@remote expression. We don't need "refs/tags"
lookup either since tags should have been imported by git::import_refs().
FWIW, I'm thinking of reorganizing view.git_refs() map as per-remote views.
It would be nice if we can get rid of revsets and template keywords exposing
low-level Git ref primitives.
Git doesn't have a root commit, so we should skip branches pointing to
it on export, just like we do with conflicted branches (which Git also
doesn't support).
Before this patch, the order would depend on the reason we failed to
export a ref, because we would add to the `failed_branches` list in
several different places. What's worse, when the export failed because
the branch was conflicted or had an invalid name (from Git's
perspective), it was non-deterministic because we iterated over a
HashSet. This patch fixes that by sorting at the end.
Note that we still want the `branches_to_update` map to be a
`BTreeMap` so we update branches in deterministic order. Otherwise the
error when trying to export both branches `main` and `main/sub` will
become non-deterministic.
Suppose "x::y" is the operator that defaults to "root()::visible_heads()"
respectively, "::" is identical to "all()". Since we've just changed the
behavior of "..y", ".." is now "root()..visible_heads()" meaning "~root()".
In `LockedWorkingCopy::drop()`, we panic if the caller had not called
`finish()`. IIRC, the idea was both to find bugs where we forgot to
call `finish()` and to prevent continuing with a modified
`WorkingCopy` instance. I don't think the former has been a problem in
practice. It has been a problem in practice to call `discard()` to
avoid the panic, though. To address that, we can make the `Drop`
implementation discard the changes (forcing a reload of the state if
the working copy is accessed again).
When restoring (`jj restore`) a 3-sided conflict from one tree into a
2-sided tree (or a resolved tree), we'll need to extend the size arity
of the target tree to that of the source tree. I had not considered
this case before. This patch relaxes the constraint in
`MergedTreeBuilder` to allow such cases. The additional trees are
based on empty trees with only the larger overrides in them.
Many (most?) callers of `Store::empty_tree_id()` really want a
`MergedTreeId`, so let's create a helper for that. It returns the
`Legacy` variant, which is what all current callers used. That should
be all we need since the two variants compare equal these days, and
since trees built based on the legacy variant can get promoted to the
new variant on write if the config is enabled.
I think most tests want a `MergedTree`, so this makes `create_tree()`
return that. I kept the old function as `create_single_tree()`. That's
now only used in `test_merge_trees` and `test_merged_tree`.
I also consistently imported the functions now, something I've
considered doing for a long time.
I made it simply fail on explicit fetch/import, and ignored on implicit import.
Since the error mode is predictable and less likely to occur. I don't think it
makes sense to implement warning propagation just for this.
Closes#1690.
With the already existing `MergedTree::resolve()` and all the recent
refactorings into `Merge<T>`, it's now very easy to add support for
3-way merging of `MergedTree` instances.
As #2165 showed, when diffing two `MergedTree::Legacy` variants (or
one of each variant) and re recurse into a subtree, we need to treat
that as a legacy tree too, so we expand `TreeValue::Conflict`s found
in the diff.
