rhg: fix a crash on non-generaldelta revlogs Differential Revision: https://phab.mercurial-scm.org/D11882

rhg: centralize index header parsing Centralize index header parsing, parse the generaldelta flag, and leave breadcrumbs to relate the code to python. Differential Revision: https://phab.mercurial-scm.org/D11881

rhg: demonstrate that rhg breaks on non-generaldelta revlogs Differential Revision: https://phab.mercurial-scm.org/D11880

tests: add a short `sleep` in test-status.t With dirstate-v2 and rhg both enabled, this test would sometimes fail for me with: ``` --- tests/test-status.t +++ tests/test-status.t#dirstate-v2.err @@ -943,7 +943,7 @@ $ rm subdir/unknown $ hg status $ hg debugdirstate --all --no-dates | grep '^ ' - 0 -1 set subdir + 0 -1 unset subdir ``` Meaning that `status` did not write a directory mtime in the dirstate as expected. This can happen if the observed mtime of the directory is the same as "current time" at the start of `status`. This current time is obtained by creating a temporary file and checking its mtime. Even with ext4 on my system being able to store nanosecond precision, identical mtime for successive but separate operations is still possible becuse the kernel may cache the current time: https://stackoverflow.com/a/14393315/1162888 0.1 second should be enough for this cache to be updated, without significantly slowing down the test. Differential Revision: https://phab.mercurial-scm.org/D11900

rhg: Add support for `rhg status --copies` Copy sources are collected during `status()` rather than after the fact like in Python, because `status()` takes a `&mut` exclusive reference to the dirstate map (in order to potentially mutate it for directory mtimes) and returns `Cow<'_, HgPath>` that borrow the dirstate map. Even though with `Cow` only some shared borrows remain, the still extend the same lifetime of the initial `&mut` so the dirstate map cannot be borrowed again to access copy sources after the fact: https://doc.rust-lang.org/nomicon/lifetime-mismatch.html#limits-of-lifetimes Additionally, collecting copy sources during the dirstate tree traversal that `status()` already does avoids the cost of another traversal or other lookups (though I haven’t benchmarked that cost). Differential Revision: https://phab.mercurial-scm.org/D11899

rhg: refactor relativize_path into a struct + method … instead of a function that takes an iterator and a callback. Differential Revision: https://phab.mercurial-scm.org/D11898

rhg: refactor display_status_paths with a struct for common arguments Differential Revision: https://phab.mercurial-scm.org/D11897

rhg: Add support for ui.ignore and ui.ignore.* config This fixes some but not all failures in `tests/test-hgignore.t` when running with `rhg status` enabled. Differential Revision: https://phab.mercurial-scm.org/D11907

doc: remove a spurious ^L in some doc This was wrongly introduced in D11784. Differential Revision: https://phab.mercurial-scm.org/D11896

upgrade: drop some dead code Everything done by this block is now done by earlier code. So we don't need it anymore. Differential Revision: https://phab.mercurial-scm.org/D11872

upgrade: only process revlogs that needs it by default We have more and more requirement that does not affect revlog or that only affect some of them. It is silly to force a full processing of all revlog to juste move the requirement around, or to simply rewrite the dirstate. So now, only the revlog that needs to be touched will be touched. Unless the --changelog & al flags are used. Differential Revision: https://phab.mercurial-scm.org/D11871

upgrade: issue a message when a revlog type has to be upgraded This is more explicite and prepare for a smoother transition to smarter picking of the revlog we will process. Differential Revision: https://phab.mercurial-scm.org/D11870

upgrade: explicitly warn when a `--no-xxx` flag is overwritten Some format upgrade/downgrades -needs- revlog to be recomputed. So we now detect that individually and warn when it contradict explicitly passed flag. This is part of a larger series to make `debugupgraderepo` smarter about which revlog it picks by default. Differential Revision: https://phab.mercurial-scm.org/D11869

upgrade: make the list of explicitly specified revlog a dict This makes various logic simpler and will help making future patch clearer. Differential Revision: https://phab.mercurial-scm.org/D11868

upgrade: move the revlog selection code lower down the chain We about about to make revlog section smarter. Moving the code around will make the next changesets clearer. Differential Revision: https://phab.mercurial-scm.org/D11867