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...to prevent additional conversions to ArtifactDigest from plain strings.
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... while keeping our .clang-format file.
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...and create StorageConfig and Storage in place if needed.
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...and adjust AnalyseContext.
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With the introduction of 'just serve', export targets can now be
built also independently from one another based on their
corresponding minimal repository configuration, as stored in the
target cache key.
In this context, this commit changes the RepositoryConfig usage
from one global (static) instance to pointers passed as necessary
throughout the code.
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Absent roots are characterised only by a Git tree hash, so a new
variant of the underlying stored information was added in the form
of a plain string.
In order to avoid unwanted implicit conversions when instantiating
via literal strings, we force callers of the constructors to
explicitly differentiate between plain strings and filesystem
paths. Existing tests were updated to reflect this.
Co-authored-by: Alberto Sartori <alberto.sartori@huawei.com>
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tests have been updated accordingly
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The improved GC implementation uses refactored storage
classes instead of directly accessing "unknown" file paths.
The required storage class refactoring is quite substantial
and outlined in the following paragraphs.
The module `buildtool/file_system` was extended by:
- `ObjectCAS`: a plain CAS implementation for
reading/writing blobs and computing digests for a given
`ObjectType`. Depending on that type, files written to the
file system may have different properties (e.g., the x-bit
set) or the digest may be computed differently (e.g., tree
digests in non-compatible mode).
A new module `buildtool/storage` was introduced containing:
- `LocalCAS`: provides a common interface for the "logical
CAS", which internally combines three `ObjectCAS`s, one
for each `ObjectType` (file, executable, tree).
- `LocalAC`: implements the action cache, which needs the
`LocalCAS` for storing cache values.
- `TargetCache`: implements the high-level target cache,
which also needs the `LocalCAS` for storing cache values.
- `LocalStorage`: combines the storage classes `LocalCAS`,
`LocalAC`, and `TargetCache`. Those are initialized with
settings from `StorageConfig`, such as the build root base
path or number of generations for the garbage collector.
`LocalStorage` is templated with a Boolean parameter
`kDoGlobalUplink`, which indicates that, on every
read/write access, the garbage collector should be used
for uplinking across all generations (global).
- `GarbageCollector`: responsible for garbage collection and
the global uplinking across all generations. To do so, it
employs instances of `LocalStorage` with `kDoGlobalUplink`
set to false, in order to avoid endless recursion. The
actual (local) uplinking within two single generations is
performed by the corresponding storage class (e.g.,
`TargetCache` implements uplinking of target cache entries
between two target cache generations etc.). Thereby, the
actual knowledge how data should be uplinked is
implemented by the instance that is responsible for
creating the data in the first place.
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Signed-off-by: Goetz Brasche <goetz.brasche@huawei.com>
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In this way, we keep the repsitory description more close to a normal
multi-repository configuration. The only difference remaining is
the absence of repository locations for git-tree roots.
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