copytrace extension in fb-hgext has a heuristic implementation of copy tracing
which is faster than the current copy tracing. The heuristic limits the search
of copies to just files that are either:
1) Renames in the same directory
2) Moved to other directory with same name
The default copytrace implementation is very slow as it finds all the new files
that were added from merge base up to the head commit and for each file it
checks whether it this was copied or moved version of a different file.
Stash@fb did analysis for the above heuristics on the fb repo and found that
among 2,443,768 moves/copies there are only 32,234 moves/copies which does not
fall under the above heuristics which is approx. 0.013 of total copies.
This patch moves the heuristics algorithm under config
`experimental.copytrace=heuristics`.
While moving fbext to core, this patch removes couple of less useful config
options named `sourcecommitlimit` and `maxmovescandidatestocheck`.
Tests are also added for the heuristics algorithm, which are basically copied
from fbext/tests/test-copytrace.t. The tests follow a pattern creating a server
repo and then cloning to a local repo to create public and draft changesets, the
distinction which will be useful in upcoming patches.
After this patch `experimental.copytrace` has the following behaviour:
1) `off`: turns off copytracing
2) `heuristics`: use the heuristic algorithm added in this patch.
3) everything else: use the full copytracing algorithm
.. feature::
A new fast heuristic algorithm for copytracing which assumes that the files
moves are either::
1) Renames in the same directory
2) Moves in other directories with same names
You can use this algorithm by setting `experimental.copytrace=heuristics`.
Differential Revision: https://phab.mercurial-scm.org/D623
As part of separating the part iteration logic from the part handling logic,
let's move the exception handling to the part iterator class.
Differential Revision: https://phab.mercurial-scm.org/D705
As part of moving the part iterator logic to a separate class, let's move the
part counting logic and the output for it.
Differential Revision: https://phab.mercurial-scm.org/D704
Currently, the part iterator logic is tightly coupled with the part handling
logic, which means it's hard to replace the part handling logic without
duplicating the part iterator bits.
In a future diff we'll want to be able to replace all part handling, so let's
begin refactoring the part iterator logic to it's own class.
Differential Revision: https://phab.mercurial-scm.org/D703
Extensions, like remotefilelog, will want to look at the source of a pull when
determining what manifests to add to a changegroup. For instance, on push they
will include everything, while on pull they won't.
Differential Revision: https://phab.mercurial-scm.org/D686
Previously revlog.addgroup would accept a changegroup and a linkmapper and use
it to iterate of the deltas. As part of untangling the revlog-changegroup
interdependency, let's move the changegroup delta iteration logic to it's own
function and pass the simple iterator to the revlog instead.
This will make it easier to introduce non-revlogs stores in the future, without
reinventing any changegroup specific logic.
Differential Revision: https://phab.mercurial-scm.org/D688
Previously the addgroup loop would set chain to be the result of
self._addrevision(node,...). Since _addrevision now always returns the passed in
node, we can drop that behavior and just always set chain = node in the loop.
This will be useful in a future patch where we refactor the cg.deltachunk logic
to another function and therefore chain disappears entirely from this function.
Differential Revision: https://phab.mercurial-scm.org/D699
When ui.origbackuppath is set, .orig files are stored outside of the working
copy, however they still have a .orig suffix appended to them. This can cause
unexpected conflicts, particularly when tracked files or directories have .orig
at the end.
This change removes the .orig suffix from files stored in an out-of-tree
origbackuppath.
Test Plan:
Update and run unit tests.
Differential Revision: https://phab.mercurial-scm.org/D679
