tests: test-pathconflicts-merge.t requires symlinks Once we're ready to turn this functionality on more widely, we might want to write a symlink-free version of the test that can run on Windows, but for now we'll just leave it disabled there. Differential Revision: https://phab.mercurial-scm.org/D1710

sshpeer: allow for additional environment passing to ssh exe We already have the ability to customize the ssh command line arguments, let's add the ability to customize its environment as well. Example use-case is ssh.exe from Git on Windows. If `HOME` enviroment variable is present and has some non-empty value, ssh.exe will try to access that location for some stuff (for example, it seems for resolving `~` in `.ssh/config`). Git for Windows seems to sometimess set this variable to the value of `/home/username` which probably works under Git Bash, but does not work in a native `cmd.exe` or `powershell`. Whatever the root cause, setting `HOME` to be an empty string heals things. Therefore, some distributors might want to set `sshenv.HOME=` in the configuration (seems less intrusive that forcing everyone to tweak their env). Test Plan: - rt Differential Revision: https://phab.mercurial-scm.org/D1683

unamend: allow unamending if allowunstable is set I don't see why unamend should be disallowed when allowunstable is set. By switching to rewriteutil.precheck() we fix that and get more consistent error messages (and some additional ones). Differential Revision: https://phab.mercurial-scm.org/D1682

rebase: add ui.log calls for whether IMM used, whether rebasing WCP Make it a bit easy to get metrics from these. Differential Revision: https://phab.mercurial-scm.org/D1681

lfs: using workers in lfs prefetch This significantly speeds up lfs prefetch. With fast network we are seeing ~50% improvement of overall prefetch times Because of worker's API in posix we do lose finegrained progress update and only see progress when a file finished downloading. Test Plan: Run tests: ./run-tests.py -l test-lfs* .... # Ran 4 tests, 0 skipped, 0 failed. Run commands resulting in lfs prefetch e.g. hg sparse --enable-profile Differential Revision: https://phab.mercurial-scm.org/D1568

worker: make windows workers daemons The windows workers weren't daemons and were not correctly killed when ctrl-c'd from the terminal. Withi this change when the main thread is killed, all daemons get killed as well. I also reduced the time we give to workers to cleanup nicely to not have people ctrl-c'ing when they get inpatient. The output when threads clened up nicely: PS C:\<dir>> hg.exe sparse --disable-profile SparseProfiles/<profile>.sparse interrupted! The output when threads don't clenup in 1 sec: PS C:\<dir> hg.exe sparse --enable-profile SparseProfiles/<profile>.sparse failed to kill worker threads while handling an exception interrupted! Exception in thread Thread-4 (most likely raised during interpreter shutdown): PS C:\<dir>> Test Plan: Run hg command on windows (pull/update/sparse). Ctrl-C'd sparse --enable-profile command that was using threads and observed in proces explorer that all threads got killed. ran tests on CentOS Differential Revision: https://phab.mercurial-scm.org/D1564