censor: extract the part about writing the censored revision in a function The v2_censor function is huge, now that its content has settled a bit it is a good time to split individual part inside dedicated function. We start with a small function that process the censored revision. Differential Revision: https://phab.mercurial-scm.org/D10898

censor: put the tuple of open files in an explicit variable This will be simpler to pass these file around in future changesets. Differential Revision: https://phab.mercurial-scm.org/D10897

revlog: rewrite `censors.py` to `rewrite.py` The logic we use for censoring revision will be mostly common with the one we needs for stripping. So we rename the module to `rewrite` to better match its future content. Differential Revision: https://phab.mercurial-scm.org/D10896

Backed out changeset 9b8f326731ac Unfortunately, disabling the rust extensions means newer Mercurial versions no longer have the persistent-nodemap feature enabled. This means a Mercurial 5.8.1 on RPM-based Linux distributions will no longer be able to read repositories created by a Mercurial 5.8 on RPM-based Linux distributions. This violates the compatibility rules (see https://www.mercurial-scm.org/wiki/CompatibilityRules ). For this reason, I have to backout this change. I'll try to find another solution to the 'hg purge' crashes. Differential Revision: https://phab.mercurial-scm.org/D10918

copies: Keep changelog sidedata file open during copy tracing Instead of having a callback that opens and closes that file many times, a add and use a context manager method on the `revlog` class that keeps files open for its duration. Differential Revision: https://phab.mercurial-scm.org/D10888

purge: restore the `testedwith` declaration Otherwise, this extension gets highlighted as a 3rd party extension when an exception occurs. Differential Revision: https://phab.mercurial-scm.org/D10895