comparison rust/hg-core/src/revlog/changelog.rs @ 50746:124c44b5cfad stable

rust-revlog: fix RevlogEntry.data() for NULL_REVISION

Before this change, the pseudo-entry returned by `Revlog.get_entry` for
`NULL_REVISION` would trigger errors in application code using it.

For example, this fixes a crash spotted with changelog data
while implementing RHGitaly: `Changelog.data_for_rev(-1)` was already
returning the pseudo content as expected, e.g., for `hg log`, but
`Changelog.entry_for_rev(-1).data()` would still crash with
"corrupted revlog, hash check failed for revision -1". There is
an added test for this scenario.

50745:3338c6ffdaa3

        let changelog = Changelog { revlog };
        assert_eq!(
            changelog.data_for_rev(NULL_REVISION)?,
            ChangelogRevisionData::null()
        );
        Ok(())
    }
}

50746:124c44b5cfad

        let changelog = Changelog { revlog };
        assert_eq!(
            changelog.data_for_rev(NULL_REVISION)?,
            ChangelogRevisionData::null()
        );
        // same with the intermediate entry object
        assert_eq!(
            changelog.entry_for_rev(NULL_REVISION)?.data()?,
            ChangelogRevisionData::null()
        );
        Ok(())
    }
}