narrow: add --no-backup option for narrowing Most of our users at Google use Mercurial on a file system that keeps backups of previous versions of all files, including those in `.hg/`. They therefore don't need a separate backup in the file system when narrowing their repo (which they typically do by running `hg tracked --auto-remove-includes`). Backups can be very slow. `hg strip` already has a `--no-backup` option. This patch adds the same option to `hg tracked --removeinclude/--addexclude`. Differential Revision: https://phab.mercurial-scm.org/D9951

debugdiscovery: add flags to run discovery on subsets of the local repo Generating new repository using strip of local clone is very expensive for large repositories. And such large repository are the most likely to requires debugging around discovery. So we add a simple way to run discovery using provided sets of heads. Differential Revision: https://phab.mercurial-scm.org/D9945

branching: merge with stable

upgrade: implement partial upgrade for upgrading persistent-nodemap Upgrading repositories to use persistent nodemap should be fast and easy as it requires only two things: 1) Updating the requirements 2) Writing a persistent-nodemap on disk For both of the steps above, we don't need to edit existing revlogs. This patch makes upgrade only do the above mentioned two steps if we are only upgarding to use persistent-nodemap feature. Since `nodemap.persist_nodemap()` assumes that there exists a nodemap file for the given revlog if we are trying to call it, this patch adds `force` argument to create a file if does not exist which is true in our upgrade case. The test changes demonstrate that we no longer write nodemap files for manifest after upgrade which I think is desirable. Differential Revision: https://phab.mercurial-scm.org/D9936

tests: unquiet a test to show changes in next patch Differential Revision: https://phab.mercurial-scm.org/D9935

nodemap: fix a typo in error message Differential Revision: https://phab.mercurial-scm.org/D9934

revlog: refactor logic to compute nodemap file in separate function I will like to use it one more place. Differential Revision: https://phab.mercurial-scm.org/D9933

nodemap: make `_persist_nodemap` a public function I will like to have a utility function using which we can directly write out nodemap for a repository without going through the recloning process. This function seems like the one containing important pieces for that. Let's make it public. Differential Revision: https://phab.mercurial-scm.org/D9932

engine: 'if not, else' -> 'if, else' I personally feel that ``` if x: pass else: pass ``` is easier to read and edit than ``` if not x: pass else: pass ``` Next patches will add one more if-else clause. Differential Revision: https://phab.mercurial-scm.org/D9931

debugcommands: s/stdin/stdout in debugnodemap help Differential Revision: https://phab.mercurial-scm.org/D9930

errors: use InputError in uncommit extension Differential Revision: https://phab.mercurial-scm.org/D9911

rhg: add support for share-safe Differential Revision: https://phab.mercurial-scm.org/D9942

rhg: initial support for shared repositories Differential Revision: https://phab.mercurial-scm.org/D9941

rhg: Add basic test with a shared repository Differential Revision: https://phab.mercurial-scm.org/D9940

tests: print the server error log in `test-url-download.t` There was a stray 500 error in CI, but no additional context to know what the issue was. https://foss.heptapod.net/octobus/mercurial-devel/-/jobs/163093 Differential Revision: https://phab.mercurial-scm.org/D9949