Summary:
treedirstate was using bytes for state and for file paths. This does
the appropriate conversions. Note, I don't use strings for all state in rust,
because it's a pain in the butt in some places. We're going to delete
treedirstate eventually anyone, so just I'm getting the test to pass for now.
Reviewed By: quark-zju
Differential Revision: D19715102
fbshipit-source-id: 4f9eac372bee7884d36aa19e3a3ed253392fa7dd
Summary:
This allows the Python code to build a memcache client and build ContentStore
and MetadataStore with it.
Reviewed By: DurhamG
Differential Revision: D19518694
fbshipit-source-id: d932fd5223ccfdf37db69cbb54a11a6571312709
Summary: This was missed while converting pyrevisionstore to PyPathBuf.
Reviewed By: markbt
Differential Revision: D19672441
fbshipit-source-id: 466a66f2e00c7f73c11a8989c22508560f423e0e
Summary:
The C implementation of util.dirs doesn't work with Python 3. Instead of trying to port it, write an implementation in Rust that works in both Python 2 and Python 3.
The old implementation had a hack for flat dirstate to omit certain entries. Remove this hack as we now only use flat dirstate in tests and small repos. This simplifies the code in the fastpath case.
Reviewed By: quark-zju
Differential Revision: D19634699
fbshipit-source-id: cbb6562bc9a0209b13f67db3dfa5250800a9fcbe
Summary: `PyPath` is to `PyPathBuf` as `Path` is to `PathBuf` and `str` is to `String`.
Reviewed By: quark-zju
Differential Revision: D19647995
fbshipit-source-id: 841a5f6fea295bc72b00da028ae256ca38578504
Summary: With this change `hg rm` works even with extensions enabled. Since this is a Cython extension, I did not bother adding type annotations since IIUC Pyre cannot type check Cython files.
Reviewed By: quark-zju
Differential Revision: D19652178
fbshipit-source-id: 2e03a0f241f80732bdae3f472a1e0576684b1911
Summary: Username as utf8, so let's make mutationmarker treat them as such.
Reviewed By: xavierd
Differential Revision: D19649887
fbshipit-source-id: 3f8b2db434a57ee8ee3017de8d925c19a2002b20
Summary:
A previous diff missed these PyPath. As a bonus, replace most of the PyObject
into proper Rust types.
Reviewed By: quark-zju
Differential Revision: D19646139
fbshipit-source-id: a3b55e5a802d8bbef86e9a9431f605bb4e284b32
Summary:
Follow up to the previous diff setting language_level to 3str for
`edenscmnative/clindex.pyx`. Consistent behavior for all files.
Reviewed By: quark-zju
Differential Revision: D19634907
fbshipit-source-id: 779d6090b5660e109a37f9740299fb9623d8f34d
Summary: Add `PyNone`. This is a marker struct that indicates that a python function can only return `PyNone`.
Reviewed By: xavierd
Differential Revision: D19644338
fbshipit-source-id: f846b146237ebf7de996177494934fec662cde0f
Summary:
`PyPath` is the type that owns the data. Rename it to `PyPathBuf` for analogy
with `PathBuf` and `RepoPathBuf`, and to allow us to introduce a reference type
named `PyPath`.
Reviewed By: xavierd
Differential Revision: D19643797
fbshipit-source-id: 56d80fea5677f7223e967b0723039d1763b26f68
Summary: The Python code expect paths to be unicode in Python3, not bytes.
Reviewed By: markbt
Differential Revision: D19643701
fbshipit-source-id: fa98da2daccccf70ac047a69b2e2359270f7e3d0
Summary: This preserves the Python errors across language boundaries.
Reviewed By: xavierd
Differential Revision: D19635355
fbshipit-source-id: 14ab8af38362182ca43951d4c560fa405687bf6e
Summary:
This causes the code to always treat unprefixed string literals as the `str`:
i.e., bytes in Python 2 and Unicode in Python 3. Without this setting our
unprefixed string literals were always being treated as unicode.
Reviewed By: lisroach
Differential Revision: D19634266
fbshipit-source-id: 770d7d03a96aa92a4e183819d34c72281c6c794b
Summary:
Globs and patterns generally speaking. They should be typed as Str in
Python3 following how paths are typed.
Reviewed By: quark-zju
Differential Revision: D19628654
fbshipit-source-id: eeaede72f41258d6fe0f3cde26c434fe0b908b8b
Summary: This allows edenapi to be able to fetch trees on Python3.
Reviewed By: quark-zju
Differential Revision: D19629411
fbshipit-source-id: f6abd585d8d672854f7219ef8e3ab86d2f659118
Summary: The hex prefix should be in str, not bytes.
Reviewed By: mitrandir77
Differential Revision: D19627762
fbshipit-source-id: dc9b054198dc61614518fec9bba69f789326ff8b
Summary:
The names are really RepoPath, and thus let's use PyPath as a way to pass these
in.
Reviewed By: quark-zju, sfilipco
Differential Revision: D19625372
fbshipit-source-id: 4802030b91e6a065d3cb1905c770cad8a86da510
Summary:
Both the repo name and the url come from the config, and thus Unicode values
are passed in in Python3. The String type handles the Python2/Python3
difference, so let's use it instead of PyBytes.
Reviewed By: DurhamG
Differential Revision: D19623202
fbshipit-source-id: 72c72f8338fbb6a2f3e88395f3587a5b59389711
Summary:
Set up the `cpython-ext` and `hgcommands` libraries so that they can compile
against py2 and py3 versions of rust-cpython. Make py2 the default so
that cargo test still works.
Reviewed By: singhsrb
Differential Revision: D19615656
fbshipit-source-id: 3403e7077deb3c0a9dfe0e3b7d4f4ad1da73bba3
Summary:
The config functions takes Str (ie: bytes in Python2, Unicode in Python3), the
b is uncessary.
Reviewed By: sfilipco
Differential Revision: D19611274
fbshipit-source-id: 0807bd6aed1b5bd0baa0b78d3dfcbb9c46aeff35
Summary: All of these should just plain strings.
Reviewed By: sfilipco
Differential Revision: D19611275
fbshipit-source-id: 1d16c10df6f67cee9dadd7480c40950c0abae926
Summary:
Deal with a few more minor string/bytes issues in Python 3, and also drop a
reference to the `long` type, which no longer exists in Python 3.
Reviewed By: xavierd
Differential Revision: D19596744
fbshipit-source-id: d7dca9306934aa6bf8c17bada6f6c1a40130027f
Summary:
This makes `make hg3` work. It requires cleaning up the `build` directory when
switching between py2 and py3 build, which will be fixed later.
Reviewed By: DurhamG
Differential Revision: D19604824
fbshipit-source-id: 060ff313420126a5dba935c4451b45dc9af45f13
Summary:
Update the pyconfigparser library so that it returns config values as
`unicode` in Python 3.
Most of the Python code already accesses config items with `str` keys,
but a few `.pyx` files were explicitly using bytes and needed to be updated to
use string keys.
Reviewed By: xavierd
Differential Revision: D19596746
fbshipit-source-id: fbeb363639b2256c57311bea996c4b371e068ae8
Summary:
Update the configparser APIs to return errors as a list of `Str` rather than
`Bytes`. The Python code already expects the errors as `str`, so this makes
the code do the right thing with Python 3.
Reviewed By: xavierd
Differential Revision: D19596745
fbshipit-source-id: 027c33d76b3a3b800de34366232285591841a900
Summary: Update to the new version of rust-cpython. This supports `list.append`, so make use of it.
Reviewed By: xavierd
Differential Revision: D19590905
fbshipit-source-id: 03609d4f698ae8e4380e82b8144caaa205b4c2d4
Summary:
Also, add a util::path::strip_unc function that is more clear than the
normalize_for_display
Reviewed By: DurhamG
Differential Revision: D19595961
fbshipit-source-id: 330bcb708bf64320a3562d79db685d6cb1e14f16
Summary:
For Python3 compatibility, let's use PyPath, it hides the logic of encoding for
Python2
Reviewed By: DurhamG
Differential Revision: D19590024
fbshipit-source-id: 7bed134a500b266837f3cab9b10604e1f34cc4a0
Summary:
Separate Segment and IdDag in two individual files. This is preparation for
refactoring IdDag to be more flexible in terms of storage. That will probably
involve moving stuff out of IdDag into a new file that deals with the storage
abstractions.
Reviewed By: quark-zju
Differential Revision: D19559127
fbshipit-source-id: b3b9b18e2653157e69148b1f29292a57b30016ec
Summary: This can prevent potential moves and clones on the caller of prefetch.
Reviewed By: quark-zju
Differential Revision: D19518697
fbshipit-source-id: 63839fc3f4bb9ca420e290eabaffb481a3584f7b
Summary:
There are few cases where we need to prefetch data that is already present in
the local store, but the server holds more up-to-date data. For instance, after
pushing a change to a pushrebase server, the linkrev for the just pushed commit
is no longer valid, and the history data is re-fetched from the server to fix
it.
For now, let's keep the fix for this contained in Python as we will move away
from linkrev altogether in the future, by then, this change will be unecessary
and can be reverted.
I'm overall not a big fan of the hacks needed here, suggestions are welcomed for
a cleaner way to achieve this :)
Reviewed By: DurhamG
Differential Revision: D19412620
fbshipit-source-id: 331f3e4dbb51bcd687149370a62c60c325534f60
Summary:
In order to avoid pathological linkrevfixup after pushing a change to a
pushrebase repo, we need to be able to fetch history data that is already
present locally from the server. Since the Rust stores will always check
whether the data is present locally before fetching it, we would not be
fetching anything, causing the pathological linkrevfixup to kick in.
By allowing the stores to be built without a local component, the prefetch
function will not find the local history, and will thus be able to fetch it
properly.
Reviewed By: DurhamG
Differential Revision: D19412619
fbshipit-source-id: 421c59c63634ead7f98e6ba89da0532067f7b412
Summary:
In the cpython bindings, the Rust String can take both PyBytes and PyUnicode
strings, which is perfect for Python3 compatibility as string literals are
PyBytes in Python2 and PyUnicode in Python3. The return values are kept as
Bytes for now as changing this is a much larger change in itself.
Other approaches tried:
- Using PyUnicode as input/output: an extremely large codemod had to be done,
with very little benefits
- Using String as output: since we do have some configs that are unicode, on
the Python side, the output might either be bytestrings or unicode, leading
to weird bugs.
Reviewed By: DurhamG
Differential Revision: D18650466
fbshipit-source-id: aebdf30590dcae40b7df2787e5ece88e2ec9395c
Summary:
Previously the mutation commit extras were the source of truth for mutation
information, and the mutation store served as a kind of cache. This turned out
to be less useful than expected, as oftentimes commits are missing, and the
store is better indexed, so in practice using the store as the source of truth
is better.
This change makes the mutationstore the (sole) source of truth for mutation
data. The extras are kept, but they are now only useful as human-readable
debug information, and to ensure the commit hash is unique.
Collecting the mutation information during commit creation is now done through
a new `mutinfo` object. This is a dict with the same keys as the mutation
extras, for simplicity, but it is now passed through the `committablectx` and
used to generate the mutation store entry directly.
The `mutation.enabled` config option is now used to control all aspects of
enabling mutation.
The `mutation.record` config option is now only used to indicate whether the
mutation extras should also added to the commit. Generally this should be set
to `true`, however the option is retained so that mutation extras can be
stripped by running `hg amend --config mutation.record=false`, which no longer
has the side-effect of not recording mutation information to the store.
The "remote commit" mutation record origin is now obsolete, and won't be
generated anymore.
Pushrebase now relies on the obsmarker information coming back from the server
in order to correctly generate mutation information. We will need to change
this so that the server returns mutation records before we can fully deprecate
obsmarkers.
Reviewed By: DurhamG
Differential Revision: D19410650
fbshipit-source-id: 8d7094e4bfd8d8e97916898d899a8debd339485f
Summary:
The error message and the exception type are slightly different between the
Rust and Python ContentStore. For now, let's just fix this up manually.
Reviewed By: quark-zju
Differential Revision: D19394350
fbshipit-source-id: e432094a9dfcf605568a1890c0303b733e98d203
Summary: This is more consistent with the name "NamedDag".
Reviewed By: singhsrb
Differential Revision: D19405472
fbshipit-source-id: f7023307acaf96bf77c9fa9704dcaf6fc59b56f2
Summary:
Previously, if the rust walker encountered any issues with individual
files it would stop and throw an exception or in some cases panic. To replace
the python walker we need to handle errors more gracefully, so let's add logic
for reporting which files had issues and what those issues were.
This also contains a minor one-line fix to prevent the walker from traversing
directories that contain a '.hg' directory.
Reviewed By: quark-zju
Differential Revision: D19376540
fbshipit-source-id: ede40f2b31aa1e856c564dd9956b9f593f21cf27
Summary:
Box-drawing characters with curves aren't reliably renderable on Windows. Add
a "square" glyph set that uses right-angle characters. These characters are
available in cp437 and cp850, so should be available on most Windows systems.
For completeness, add a "dec" glyph set that uses DEC line drawing characters,
for use in old terminals like xterm.
Reviewed By: quark-zju
Differential Revision: D19371722
fbshipit-source-id: 35887243cceab66c702e2b5278b572f77946805f
Summary:
The expected error type is RevlogError. Previously that RevlogError
was converted from RuntimeError. However, D19169527 stack changed
RuntimeError to RustError, causing clindex partialmatch to raise
RustError instead, which is not handled by the Python layer.
Convert RustError to RevlogError to solve the issue.
Context:
https://fb.workplace.com/groups/scm/permalink/2591821277534143/
Reviewed By: DurhamG
Differential Revision: D19359074
fbshipit-source-id: 7b7b500cdf01272791a73ea0d94397e1397ff80b
Summary:
For some reason, our linker flag `-uinitthreading` no longer works in buck opt
build. This affects the `indexes` and `threading` Python extensions. Move them
to `bindings` to solve the problem.
Reviewed By: fanzeyi
Differential Revision: D19340538
fbshipit-source-id: 0c82b472f2916229d3c5e481954b69415b5b0dc2
Summary:
Per discussion, we decided to use "VertexName" as the struct name for things
like commit hashes, or the string names in tests (or the Mozilla DAG in tests).
Therefore, introduce a dedicated VertexName type and repalce all callsites to
use it.
`bytes::Bytes` is used so copying the `VertexName` is somewhat considered cheap.
This adds some overhead copying slices (and `Bytes` has some overhead). It
regresses the "building segments" benchmark from 673ms to 773ms, which seems
okay given the cleaner interface.
Reviewed By: markbt
Differential Revision: D19154905
fbshipit-source-id: 4c6d4eca67c11c10ed5f21999ccdc3f1b01695e8
Summary:
Python errors wrapped in a Rust Error would be incorrectly changed into a
RuntimeError instead of the original one. The map_pyerr method does the right
thing, and is also shorter, let's use it.
Reviewed By: quark-zju
Differential Revision: D19313883
fbshipit-source-id: 1ecb41a8eef9d41618905d6d00f199252d373f96
Summary:
This makes it possible to use the hgtime parsing utilities in Python.
Namely, patterns like `since 6 days ago to now` can now be parsed.
Reviewed By: sfilipco
Differential Revision: D18946335
fbshipit-source-id: c12ea3437301f20a8c457525c0798f471b8f174a
Summary:
Make cpython-ext free from business logic. This adds a bit overhead.
But it should be fine given the error cases are considered rare.
Reviewed By: markbt
Differential Revision: D19186692
fbshipit-source-id: daaffc1369a36c781d1badea822bf62a144eb54e
Summary: We no longer use the `failure` crate. Rename related methods and traits.
Reviewed By: markbt
Differential Revision: D19186694
fbshipit-source-id: 1c83a90ee12db431b7d8e09a9c2cf1d43a4c0f93
Summary:
We no longer use the `failure` crate. Rename the module.
`cpython-failure` is dropped since it was merged into `cpython-ext`.
Reviewed By: markbt
Differential Revision: D19186693
fbshipit-source-id: 410d1491bcadd8d3272c7e2df08ecbe66fc0fef2
Summary:
The `map_pyerr<PE>` API is kind of hard to use correctly since the
code that calls `map_pyerr` does not really know the best suitable error type.
The existing code also "encourage"s the use of stdlib error types like
RuntimeError, ValueError, etc since the code is shorter, which is not great.
Error types from `mercurial.error` are better choices.
With previous diffs in this stack, we now decide the Python error type based
on the Rust error type. It's no longer necessary to specify an error type
with `map_pyerr<PE>`. So let's just drop the type parameter.
A `RustError` was added for error types that `cpython-ext` does not know how
to convert. We should avoid leaking it to the Python land by just implementing
how to convert `anyhow::Error` to `PyErr` in `cpython-ext`.
Reviewed By: markbt
Differential Revision: D19169527
fbshipit-source-id: f4563c36174cd51201b526bbc92a3f1c8a3da864
Summary:
Expose the indexedlog error type to Python so it can be used in `except`
clause.
Reviewed By: markbt
Differential Revision: D19169208
fbshipit-source-id: c41f08ec11f78f7714b435dbfc6a28c36b34617d
Summary:
Address review comment in D18640899. This makes the word `id` universally
refer to a same concept within the crate.
Reviewed By: sfilipco
Differential Revision: D18820723
fbshipit-source-id: 6803192db7e1304a72100568f8f29b90f25c7779
Summary: This should allow us to show a spinning progress bar when repair() is working.
Reviewed By: xavierd
Differential Revision: D19056949
fbshipit-source-id: 8e058bad002bb2de29dbf8457bead0ebd1e99372
Summary:
The list functionality is required by EdenFs. We want this functionality
to be well supported by the Manifest.
Reviewed By: quark-zju
Differential Revision: D18870143
fbshipit-source-id: 1ebaa713ff521226e6ace22cbd35cc841d967298
Summary:
Consistency in naming. The general idea is to have Metadata types that don't
contain paths. Then we will have File, Directory and eventually FsNode that
will contain paths.
Reviewed By: quark-zju
Differential Revision: D18870141
fbshipit-source-id: a1f09add7f1c3dd4fa0348693cd3ce2fd5767fa7
Summary:
This rename is going to make it easier to import and use outside of
manifest specific crates.
Reviewed By: quark-zju
Differential Revision: D18870142
fbshipit-source-id: 2f3ea460170308162ee834efc038b2dcedd9e233
Summary: Expose the repair API to the Python world.
Reviewed By: xavierd
Differential Revision: D18737913
fbshipit-source-id: c31085727589b6938c2fafb28897925aea617bc4
Summary:
This simplifies the logic a bit by getting a free `repair` method from
indexedlog.
Reviewed By: xavierd
Differential Revision: D18737908
fbshipit-source-id: 4988c1a83b7709b751cd1899c5663acc0c42e313
Summary:
This isolates the core types in manifest so that it is harder to
create unsound dependencies with specific implementations.
Reviewed By: quark-zju
Differential Revision: D18843133
fbshipit-source-id: 4b866ad84d2e7d0ff2dc4ec6bd65f66548c3fe4a
Summary:
The bindings APIs are out of date.
The latest idea is to write non-master commits to disk, in a different group.
There are no "segments in memory". Therefore:
- Rename `builddisk` to `build`.
- Make sure `build` updates internal states by calling `reload`.
- Drop `buildmem`.
- In case `builddisk` gets called very frequently, reduce its overhead by
doing nothing if all commits are built already.
The constructor is revised to match the latest interface (no
"max segment level" and "set_new_segment_size" needs to be called).
Reviewed By: sfilipco
Differential Revision: D18640897
fbshipit-source-id: 76a5d0db363713dc5b763503c238c1bfa61ea02e
Summary:
This allows us to allocate Ids for non-master commits in a separate range
so they wouldn't cause fragmentation for commits in the master group.
Reviewed By: sfilipco
Differential Revision: D18640896
fbshipit-source-id: c19c53342583ded8795849584cf5f31bc86b2818
Summary: Migrate the codebase to use the new Id type instead of an alias of u64.
Reviewed By: sfilipco
Differential Revision: D18640898
fbshipit-source-id: 415db9afeda1f8960e18c69e70f53a9eeb63cbbe
Summary:
It would be nice if the insert method would give back the path that
it failed to insert.
Reviewed By: dtolnay
Differential Revision: D18739978
fbshipit-source-id: 4c16d09750ade2f01397161129c31bcf0059a957
Summary:
The Mercurial code has the bad habbit of inserting files in what can
appear impossible locations. Sometimes files with directory names and
sometimes directories in file locations. This happens because the initial
code would do additions before deletions on Manifest implementations that
were rudimentary. As soon as we introduce validation various code paths
surface.
I tried to fix the codepaths that modify manifests but it's a losing game.
I fixed the issue that appeared in tests and a couple of issues people
reported but more situations crop up.
This is giving up on the python code.
Reviewed By: quark-zju
Differential Revision: D18737678
fbshipit-source-id: 0c97128ff67e5ba2334942b6afc404aa64a2e5f4
Summary:
This helps test if there are uncommitted changes. It can help detecting
programming errors. For example, is metalog changed before starting a
transaction?
Reviewed By: xavierd
Differential Revision: D18538148
fbshipit-source-id: 9c82838d8174e6a93fde7108503a025660191cbf
Summary:
This diff replaces eden's dependencies on failure::Error with anyhow::Error.
Failure's error type requires all errors to have an implementation of failure's own failure::Fail trait in order for cause chains and backtraces to work. The necessary methods for this functionality have made their way into the standard library error trait, so modern error libraries build directly on std::error::Error rather than something like failure::Fail. Once we are no longer tied to failure 0.1's Fail trait, different parts of the codebase will be free to use any std::error::Error-based libraries they like while still working nicely together.
Reviewed By: xavierd
Differential Revision: D18576093
fbshipit-source-id: e2d862b659450f2969520d9b74877913fabb2e5d
Summary: Migrate callsites to use the new pattern matching filtering APIs.
Differential Revision: D18610738
fbshipit-source-id: 242182f4e6a58bbff5dddbb177287921c85519bc
Summary: This diff adds `Option<HgId>` to `FsNode::Directory` because EdenFS needs the tree hash for the directories in the tree.
Reviewed By: sfilipco
Differential Revision: D18307205
fbshipit-source-id: 93db944ff1686a1c5927aa9a876a0fd008edbf9a
Summary:
Edenapi uses a group of impls like the following as the canonical way to construct ApiError.
```
impl From<Context<ApiErrorKind>> for ApiError {
```
Downstream code would write:
```
use failure::ResultExt;
let stream_trees = config
.get_or_default("edenapi", "streamtrees")
.context(ApiErrorKind::BadConfig("edenapi.streamtrees"))?;
```
This relies on the way that ResultExt::context returns a unique type that is different from failure::Error.
This diff introduces a dedicated extension trait to allow the same code in the caller to continue to work even without a failure::Context<T> type, which will be required for dropping our dependency on failure::Fail and failure.
```
pub trait ApiErrorContext<T> {
fn context(self, kind: ApiErrorKind) -> ApiResult<T>;
}
```
We also introduce a public constructor for ApiError and replace indirect construction that used to look like this:
```
error.context(ApiErrorKind::Curl).into()
```
with this instead:
```
ApiError::new(ApiErrorKind::Curl, error)
```
which is the same number of characters but clearer. The argument order matches [std::io::Error::new](https://doc.rust-lang.org/std/io/struct.Error.html#method.new).
Reviewed By: kulshrax
Differential Revision: D18574668
fbshipit-source-id: 0a56297bb942a26d75a62ca39fc16abeb4486345
Summary:
On Windows, the paths passed to the `match` functions are not encoded in utf-8
yet. Do not crash if received them.
Reviewed By: sfilipco
Differential Revision: D18574951
fbshipit-source-id: c22ce95cb6538db0c15d60789286e2ff7d2148bc
Summary:
This diff is preparation for migrating off of failure::Fail / failure::Error for errors in favor of errors that implement std::error::Error. The Fallible terminology is unique to failure and in non-failure code we should be using Result<T>. To minimize the size of the eventual diff that removes failure, this codemod replaces all use of Fallible with Result by:
- In modules that do not use Result<T, E>, we import `failure::Fallible as Result`;
- In modules that use a mix of Result<T, E> and Fallible<T> (only 5) we define `type Result<T, E = failure::Error> = std::result::Result<T, E>` to allow both Result<T> and Result<T, E> to work simultaneously.
Reviewed By: Imxset21
Differential Revision: D18499758
fbshipit-source-id: 9f5a54c47f81fdeedbc6003cef42a1194eee55bf
Summary:
simpkins encountered a case where the treematcher does not work with many
patterns. It turns out `globset` has a hard-coded regex size limit (10MB).
Implement proper error handling so we can detect such issues and fallback to
slower paths.
Reviewed By: sfilipco
Differential Revision: D18500299
fbshipit-source-id: 0122ba9b0246c1536b2069a40e13261ee47f8bba
Summary:
In preparation for merging fb-mercurial sources to the Eden repository,
move everything from the top-level directory into an `eden/scm`
subdirectory.
