irmin-pack: disallow split when gc is disallowed #2175
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metanivek
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art-w
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Jan 30, 2023
The value stored in the control file is *not* inclusive of the dead header size, so we must subtract it from the on-disk size before passing to Append_only_file's open function. Otherwise, the consistency check is not correct and will falsely claim the chunk is inconsistent.
Split will raise an exception if it is not allowed. Also, expose a function for checking if it is enabled, which is the same as GC being enabled or not.
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…min-pack, irmin-pack-tools, irmin-mirage, irmin-mirage-graphql, irmin-mirage-git, irmin-http, irmin-graphql, irmin-git, irmin-fs, irmin-containers, irmin-cli, irmin-chunk and irmin-bench (3.7.0)
CHANGES:
### Added
- **irmin**
- Add `Conf.pp` and `Conf.equal` to print and compare configuration values
(mirage/irmin#2227, @samoht)
- Add a `clear` optional arguments to all function that adds a new commit:
`Commit.v`, `set`, `set_tree`, `remove`, `test_and_set`,
`test_and_set_tree`, `test_set_and_get`, `test_set_and_get_tree`, `merge`,
`merge_tree` and `with_tree`. This new argument allows to control whether
the tree caches are cleared up after objects are exported to disk during
the commit. (mirage/irmin#2225, @samoht)
- **irmin-pack**
- Add configuration option, `lower_root`, to specify a path for archiving data
during a GC. (mirage/irmin#2177, @metanivek)
- Add `is_split_allowed` to check if a store allows split. (mirage/irmin#2175, @metanivek)
- Add `add_volume` to allow creating new empty volume in lower layer. (mirage/irmin#2188,
@metanivek)
- Add a `behaviour` function to the GC to check wether the GC will archive or
delete data. (mirage/irmin#2190, @Firobe)
- Add a migration on `open_rw` to move the data to the `lower_root` if
the configuration was enabled (mirage/irmin#2205, @art-w)
### Changed
- **irmin**
- Expose type equality for `Schema.Info` to avoid defining the `info` function
multiple times when using similar stores (mirage/irmin#2189, mirage/irmin#2193, @samoht)
- **irmin-pack**
- GC now changes its behaviour depending on the presence of a lower layer.
(mirage/irmin#2190, @Firobe)
- Split now raises an exception if it is not allowed. It is not allowed on
stores that do not allow GC. (mirage/irmin#2175, @metanivek)
- GC now supports stores imported V1/V2 stores, in presence of a lower layer
only. (mirage/irmin#2190, @art-w, @Firobe)
- Upgrade on-disk format to version 5. (mirage/irmin#2184, @metanivek)
- Archive to lower volume does not copy orphaned commits. (mirage/irmin#2215, @art-w)
### Fixed
- **irmin-pack**
- Unhandled exceptions in GC worker process are now reported as a failure
(mirage/irmin#2163, @metanivek)
- Fix the silent mode for the integrity checks. (mirage/irmin#2179, @icristescu)
- Fix file descriptor leak caused by `mmap`. (mirage/irmin#2232, @art-w)
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This PR addresses an issue found while testing the latest octez release candidate.
The ultimate result of the this PR is to disallow split if GC is disallowed, but also includes a commit that fixes the issue in case it is allowed in the future.
Split_disallowedexception when callingspliton a a store that does not allow itStore.is_split_allowedto check whethersplitcan be called without raising an exceptionspliton a store that has statusFrom_v1_v2_post_upgrade, it would raise anInconsistent_storeexception when attempting to re-open the first chunk as read-only because theend_poffcalculation did not subtract thedead_header_size. This exception was false; no actual on-disk data corruption had occurred. Thanks to @art-w for the help in investigation and discovery of this root cause. 🙇