worker: raise exception instead of calling sys.exit() with child's code When a worker process returns an error code, we would call `sys.exit()` with that exit code on the main process. The `SystemExit` exception would then get caught in `scmutil.callcatch()`, which would return that error code. The comment there says "Commands shouldn't sys.exit directly", which I agree with. This patch changes it so we raise a specific exception when a worker fails so we can catch instead. I think that means that `SystemExit` is now always an internal error. (I had earlier thought that this call to `sys.exit()` was from within the child process until Matt Harbison made me look again, so thanks for that!) Differential Revision: https://phab.mercurial-scm.org/D9287

config: read system hgrc in lexicographical order This is similar to edbcf5b239f9 (config: read configs from directories in lexicographical order, 2019-04-03). Apparently I forgot to sort the system hgrc files there. That's fixed by this patch. Differential Revision: https://phab.mercurial-scm.org/D9269

relnotes: drop 5.6 release entries from next Differential Revision: https://phab.mercurial-scm.org/D9282

merge with stable

makefile: use Python 3 by default (BC) This change is long overdue IMO. .. bc:: Makefile now uses `python3` instead of `python` by default on non-Windows platforms. This means Mercurial will be built and run with Python 3 instead of Python 2.7 by default. To continue using Python 2, set the PYTHON variable. e.g. `make install PYTHON=python2.7`. Differential Revision: https://phab.mercurial-scm.org/D7258

hgweb: don't call sys.exit() in httpservice.run() If I'm reading the code correctly, `mercurial.server.createservice()` can return an hgweb service or one of three types of command server services. The caller then calls `mercurial.server.runservice()`, passing it the returned service's run method. Only the hgweb service was calling `sys.exit()`. It has been that way since 8d44649df03b (refactor ssh server., 2006-06-04). That commit message doesn't provide any explanation. Let's clean up and have the code follow the usual return path into the `dispatch` module. After this patch, there should be no remaining places left where we call `sys.exit()` except for valid uses in the `dispatch` and `worker` modules. Differential Revision: https://phab.mercurial-scm.org/D9272

serve: simply return instead of calling sys.exit() in `hg serve --stdio` The shouldn't be a reason to call `sys.exit()` instead of letting the code return normally. I've remove the call in both `hg serve` and `hg debugserve`. Differential Revision: https://phab.mercurial-scm.org/D9271

httpservice: move sys.exit() out of serve_forever() This is a simple refactoring to show the callers of the method, so it's easier to reason about the impact of removing the `sys.exit()` calls in subsequent patches. Differential Revision: https://phab.mercurial-scm.org/D9270

copies: handle more cases where a file got replaced by a copy This patch fixes the changeset-centric version in a pretty straight-forward way. It fixes it to automatically resolve the conflict, which is better than resulting in a modify/delete conflict as it was before b4057d001760 (merge: when rename was made on both sides, use ancestor as merge base, 2020-01-22). I'll leave it for later to test and explicitly handle cases where files have been renamed to the same target on different sides of the merge. Differential Revision: https://phab.mercurial-scm.org/D8653

tests: test more cases where a file got replaced by a copy This adds a test where a file is modified on one branch and is renamed onto another file in another branch. That should ideally be automatically resolved (by propagating the modification to the rename destination). Alternatively, it could be considered a modify/delete conflict. It should at least not be automatically resolved by ignoring the modification. However, that is what actually happens with the changeset-centric algorithm since I broke it in b4057d001760 (merge: when rename was made on both sides, use ancestor as merge base, 2020-01-22). Before that commit, it resulted in a modify/delete conflict. The filelog-centric algorithm was broken already before that commit. Differential Revision: https://phab.mercurial-scm.org/D8652

unionrepo: don't insert index tuples with None as int field None is not a valid size. Use -1 as placeholder instead. This will be necessary when the index starts enforcing type correctness. Differential Revision: https://phab.mercurial-scm.org/D9161

bundlerepo: don't insert index tuples with full nodes as linkrev The index format has a documented format and latter changes will start to enforce the field types. The bundlerepo uses full nodes for the linkrev field when it should be using revision numbers. Use the link mapping to resolve them, except in the special case of self-references. Those are actually indications of a missing linkrev. Differential Revision: https://phab.mercurial-scm.org/D9160

rhg: add full node id support for `debugdata` command Unlike other later implemented commands `debugdata` only supported revision number. This changeset add full node id support for consistency with other commands. Differential Revision: https://phab.mercurial-scm.org/D9230

commit: warn the user when a commit already exists Sometimes, a commit will result in an exact match of a preexisting commit, and if that commit isn't a branch head, hg will incorrectly note that it created a new head. Instead, we should warn the user that commit already existed in the repository. In practice, this bug is rather uncommon, and will only occur when the usr explicitly sets the date. Please note that this commit contains an API change to cmdutil.commitstatus() Differential Revision: https://phab.mercurial-scm.org/D9257

revlog: don't cache parsed tuples in the C module A cached entry creates ~8 Python objects per cached changeset, which comes to around 200 Bytes per cached changeset on AMD64. Especially for operations that touch a lot of changesets, that can easily sum up to more than a 100MB of memory. Simple tests on large repositories show <2% runtime penalty for ripping out the cache, even for cache heavy operations like "hg log" for all revisions. Differential Revision: https://phab.mercurial-scm.org/D9155

fix: only check for obsolete commits in the --rev case With both `--all` and `--source`, we already exclude obsolete revisions in the revset, so there's no need to call `checkfixablectx()` in those cases. Differential Revision: https://phab.mercurial-scm.org/D9227

fix: don't include obsolete descendants with -s The `-s/--source` option is for regular users (`-r` is there for power users). If there are obsolete commits that are descendants of the given revision(s), then they almost definitely should just be left alone. That's what `hg rebase` does as well. So this patch makes it so we skip obsolete commits (including those in the input set itself). Differential Revision: https://phab.mercurial-scm.org/D9226

tests: add test showing how `hg fix -s` deals with obsolete and orphan nodes We didn't have any tests for how `hg fix -s` behaves with obsolete commits among the descendants. The next patch will change the behavior in this area. Differential Revision: https://phab.mercurial-scm.org/D9225

fix: suggest --source instead of --rev on empty revset `--source` is the recommended flag for regular users (`--rev` is available for advanced users). Differential Revision: https://phab.mercurial-scm.org/D9224

hg-core: fix path encoding usage 1. Hash encoded path are in `.hg/store/dh` instead of `.hg/store/data`. 2. Path encoded index and data files may not have the same parent path. It is not just about replacing `.i` by `.d` Differential Revision: https://phab.mercurial-scm.org/D9121

push: add --all-bookmarks option Differential Revision: https://phab.mercurial-scm.org/D9261

rhg: strip copied files metadata from `cat` output Differential Revision: https://phab.mercurial-scm.org/D9264

merge with stable

chg: close file descriptors when starting the daemon It's good practice to close file descriptors when forking to start a daemon. This did not appear to happen yet, which results in flock hanging in one location in our system (because the chg daemon keeps the locked file open). Differential Revision: https://phab.mercurial-scm.org/D9268

crecord: render chunkpad on Windows (issue6427) When using Windows wrappers of PDCurses (e.g., windows-curses), the chunkpad does not render when executing `hg commit -i`. This is due to attempting to refresh one too many columns of the pad. Differential Revision: https://phab.mercurial-scm.org/D9267

Added signature for changeset 18c17d63fdab

Added tag 5.6 for changeset 18c17d63fdab

copies: make sure deleted copy info do not overwriting unrelated ones See test documentation for details. This is yet another corner case for copy tracing. Differential Revision: https://phab.mercurial-scm.org/D9200

utils: helper function to print top memory allocation site The memorytop function uses Python's tracemalloc module to show the source lines / backtraces with the largest remaining allocations. This allows identifying the origins of active memory by placing calls in strategic locations. Allocations from C extensions will show up as long as they are using the Python allocators. Differential Revision: https://phab.mercurial-scm.org/D9236

templates: include all non-branch namespaces in default one-line summary I left out branches and custom namespaces on purpose from D9252 because I figured that people like us (Google) who have custom namespaces can also have custom configs. However, I just realized that this makes everyone with the topic extension lose the topic they've had in rebase output for a long time (ever since someone was nice enough to add it in D741). Sorry about the churn. The more generic template couldn't easily keep the "log.bookmark" label in the template because the namespace is called "bookmarks" (plural). That means that we can't be compatible with users' existing configs for "log.bookmark", so I decided to change the labels to be in a brand-new "oneline-summary" namespace. Differential Revision: https://phab.mercurial-scm.org/D9262