fix: add a config to abort when a fixer tool fails This allows users to stop and address tool failures before proceeding, instead of the default behavior of continuing to apply any tools that didn't fail. For example, a code formatting tool could fail if you have syntax errors, and you might want your repo to stay in its current state while you fix the syntax error before re-running 'hg fix'. It's conceivable that this would even be necessary for the correctness of some fixer tools across a chain of revisions. Differential Revision: https://phab.mercurial-scm.org/D5200

perf: measure slicing time in perfrevlogrevision Slicing a sparse delta chain can be expensive. We now benchmark the associated time.

perf: teach perfrevlogrevision about sparse reading Before this change, chunks were always read in a single block. Even in the sparse-read/sparse-revlog case. This gave a false view of the performance and could lead to memory consumption issue.

perf: use the same timer for all section of perfrevlogrevision Otherwise the -T json output is invalid.

obsutil: clarify the access to "repo" We use the variable multiple times and we might use it even more in the future. We use a temporary variable instead.

pycompat: adding Linux detection and fixing Mac Python 3 recommends detecting OSs with the prefix of the platform, but we were comparing the full string for macOS. We also didn't have Linux detection, which is convenient for extensions to use (rather than have some OSs detected by hg and some by the extension). Reference: https://docs.python.org/3/library/sys.html#sys.platform Differential Revision: https://phab.mercurial-scm.org/D5227

remotefilelog: fix various minor py3 problems # skip-blame b prefixes and pycompat.long, nothing remotely interesting Differential Revision: https://phab.mercurial-scm.org/D5223