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pydag: add an API to migrate from one DAG to segmented DAG

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Summary:
This will be used for migrating revlog DAG to segmented changelog. It does not
migrate commit text data (which can take 10+ minutes).

Reviewed By: DurhamG, sfilipco

Differential Revision: D22970582

fbshipit-source-id: 125a8726d48e15ceb06edb139d6d5b2fc132a32c
This commit is contained in:
Jun Wu 2020-08-20 17:13:50 -07:00 committed by Jun Wu
parent 9f8961a75c
commit fa25f42fea
2 changed files with 19 additions and 0 deletions
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12
eden/scm/edenscmnative/bindings/modules/pydag/src/commits.rs
View File

@ -145,6 +145,18 @@ py_class!(pub class commits |py| {
Self::from_commits(py, inner)
}
/// Migrate from revlog to segmented changelog (full IdMap).
///
/// This does not migrate commit texts and therefore only useful for
/// doublewrite backend.
@staticmethod
def migraterevlogtosegments(revlogdir: &PyPath, segmentsdir: &PyPath, commitsdir: &PyPath, master: Names) -> PyResult<PyNone> {
let revlog = RevlogCommits::new(revlogdir.as_path()).map_pyerr(py)?;
let mut segments = HgCommits::new(segmentsdir.as_path(), commitsdir.as_path()).map_pyerr(py)?;
py.allow_threads(|| segments.import_dag(revlog, master.0)).map_pyerr(py)?;
Ok(PyNone)
}
/// Construct "double write" `commits` from both revlog and segmented
/// changelog.
@staticmethod

7
eden/scm/lib/hgcommits/src/hgsha1commits.rs
View File

@ -53,6 +53,13 @@ impl HgCommits {
};
Ok(result)
}
/// Import another DAG. `main` specifies the main branch for commit graph
/// optimization.
pub fn import_dag(&mut self, other: impl DagAlgorithm, main: Set) -> Result<()> {
self.dag.import_and_flush(&other, main)?;
Ok(())
}
}
impl AppendCommits for HgCommits {