We ran into a bug in `MergedTree` with our commit backend at
Google. The problem there was that `MergedTree` sometimes uses the
wrong path when reading files and trees. We didn't catch the bug in
our tests (outside of Google) because both our backends let you read
files and trees at any path.
This commit introduces a stricter backend that we can use in tests to
catch this kind of bug. For simplicity, it stores all data in
memory. Since tests are short-lived, I think that should be fine.
For now, this backend is stricter only in that it doesn't mix objects
written to different paths. We can make it strict/lossy in other ways
later (e.g. modifying written commit objects).
I think having a backend designed for tests can also be useful for
later making it possible to control the backend, e.g. to inject
errors.
We may want to replace almost all uses of the local backend in tests
with uses of this new test backend.
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 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.
The VS Code "Better TOML" plugin (which I think most of our VS Code developers use?) doesn't support the `x.y = z` syntax at the top level, even though it's valid TOML.
This is also useful if we ever want to add additional properties in different sub-crates (although unlikely for the near future).
Summary: There's no need to go around specifying `rust-version` or `edition` or
`version` several times, now that we have a global workspace. Instead, inherit
workspace metadata from the top-level Cargo.toml file.
Signed-off-by: Austin Seipp <aseipp@pobox.com>
Change-Id: Iaf905445978ed2b3377239dcdb8a6c32
Summary: This moves all dependencies across the jj-lib and jj-cli crates into
the top-level Cargo file; with that, we can change each crate instead to just
inherit the workspace version, with the toggled features enabled, by setting
a dependency such as:
dep.workspace = true
in the relevant Cargo.toml file.
This doesn't actually change any of the build semantics (from what I can tell)
nor the lockfile, and seems to respond normally. There are more cleanups that
can follow.
Two notes:
- Dependabot seems to work fine, based on what I've seen in other repos.
- `cargo add` doesn't seem to know how to add packages to a top-level
`workspace.dependencies` field; instead you can `cargo add -p jj-cli`
and move the entries, at least.
Signed-off-by: Austin Seipp <aseipp@pobox.com>
Change-Id: I307827e5f15c0d8ea8e2a80ec793d3c7
It's currently a bit complicated to snapshot the working copy and
there's a lot of duplication in tests. This commit introduces a
function to simplify it. I made the function snapshot the working copy
and save the updated state. Some of the tests I changed previously
discarded the changes instead of saving them, but I think they all did
so because it was simpler. I left a few call sites unchanged because
they make concurrent changes.
In order to store conflicts in the commit, as conflicts between a set
of trees, we want to be able merge those trees on the fly. This
introduces a type for that. It has a `Merge(Conflict(Tree))` variant,
where the individual trees cannot have path-level conflicts. It also
has a `Legacy(Tree)` variant, which does allow path-level conflicts. I
think that should help us with the migration.
Almost everyone calls the project "jj", and there seeems to be
consensus that we should rename the crates. I originally wanted the
crates to be called `jj` and `jj-lib`, but `jj` was already
taken. `jj-cli` is probably at least as good for it anyway.
Once we've published a 0.8.0 under the new names, we'll release 0.7.1
versions under the old names with pointers to the new crates names.
Errors that may occur while loading backend would vary per backends, and
it's unlikely that these errors could be mapped to BackendError variants
other than BackendError::Other. So let's extract Other(_) of that kind as
a separate type to clarify there would be no other error variants.
Perhaps, Backend/Error will be renamed to CommitBackend/Error or
CommitStore/Error?, whereas I think BackendInit/LoadError can be shared
among store factories.
This commit fixes#1305
Before this commit, running `jj init --git-repo=./` in a folder that
does not have a .git would cause jj to panick and leave an unfinished corrupted jj repo.
This commit fixes that by changing the call chain to return an error
instead of calling .unwrap() and panicking. This commit also adds logic to delete the unfinished jj
repository when the git backend initialization failed.
Before this commit, running the above command would result in the following
```
Running `jj/target/debug/jj init --git-repo=./`
thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: Error { code: -3, klass: 2, message: "failed to resolve path '/Users/kevincliao/github/jj/test-repo/.jj/repo/store/../../../.git': No such file or directory" }', lib/src/git_backend.rs:83:75
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
```
After this commit, the result is the following and the jj repo is deleted:
```
Running `jj/target/debug/jj init --git-repo=./`
Error: Failed to access the repository: Error: Failed to open git repository: failed to resolve path '/Users/kevincliao/github/jj/test-repo/.jj/repo/store/../../../.git': No such file or directory; class=Os (2); code=NotFound (-3)
```
..and other assorted boilerplate. These are just stubs for now, but now
that we've reserved the `submodule_store` subdirectory, we can start
adding more functionality.
This is another step towards allowing a custom `jj` binary to have its
own index type. We're going to have a server-backed index
implementation at Google, for example.
I'm about to make `RepoLoader::init()` return a `Result`, and I don't
want to have to wrap that in a new error in
`ReadonlyRepo::load_at_head()` since that's only used in tests.
It's been about 10 weeks and 730 commits since 0.6.0, compared to
about 7 weeks and 350 commits between 0.5.0 and 0.6.0, so it's time
for a new release. There's been significant user-visible changes and
code-quality improvements. Thanks, everyone!
We already have `create_random_commit()`, which returns a
`CommitBuilder`. Most callers directly write that to a
`MutableRepo`. That currently returns a `Commit`, but I'm about to
make it propagate errors from the backend. That would add an
`unwrap()` to this sequence, making it longer. Let's create a simple
helper for these callers to simplify this common pattern.
When you're done with the `CommitBuilder`, you're going to have to
call `write_to_repo()`, passing it a mutable `MutableRepo`
reference. It's a bit simpler to pass that reference when we create
the `CommitBuilder` instead, so that's what this patch does.
A drawback of passing in the mutable reference when we create the
builder is that we can't have multiple unfinished `CommitBuilder`
instance live at the same time. We don't have any such use cases yet,
and it's not hard to work around them, so I think this change is worth
it.
I ran an upgraded Clippy on the codebase. All the changes seem to be
about using variables directly in format strings instead of passing
them as separate arguments.
