tests: factor external procedures out for portability Fortunately, "&&" is treated as "execute next, if previous doesn't fail" both on POSIX and Windows. But keeping portability of "dirstaterace.command" manually is troublesome. This patch factors external procedures out as a shell script for portability. "sh SCRIPT" always allows scripting in POSIX style. This change is also for convenience. Fixed script name can reduce command line arguments. "r" prefix is needed for "sh '$TESTTMP/dirstaterace.sh'", because $TESTTMP contains backslash on Windows.

dirstate: add identity information to detect simultaneous changing in storage This identity is used to examine whether dirstate is simultaneously changed in storage after previous caching (see issue5584 for detail). util.cachestat can't be used for this purpose, because it has no valuable information on Windows. On the other hand, util.filestat can detect changing dirstate in storage certainly, regardless of platforms. https://www.mercurial-scm.org/wiki/ExactCacheValidationPlan Strictly speaking, if underlying filesystem doesn't support ctime/mtime, util.filestat can't detect simultaneous changing in storage as expected. But simultaneous changing on such (very rare) platform can't be detected regardless of this patch series. Therefore, util.filestat should be reasonable identity for almost all usecases.

util: make filestat.__eq__ return True if both of self and old have None stat For convenience to compare two filestat objects regardless of None-ness of stat field.