alias: handle shlex error in command aliases No command should fail with ValueError just because there is unparseable alias definition. It returns 1 like other badalias handlers, but should be changed to 255 in a later version because we use 255 for general command error.

subrepo: normalize path in the specific way for problematic encodings Before this patch, "reporelpath()" uses "rstrip(os.sep)" to trim "os.sep" at the end of "parent.root" path. But it doesn't work correctly with some problematic encodings on Windows, because some multi-byte characters in such encodings contain '\\' (0x5c) as the tail byte of them. In such cases, "reporelpath()" leaves unexpected '\\' at the beginning of the path returned to callers. "lcalrepository.root" seems not to have tail "os.sep", because it is always normalized by "os.path.realpath()" in "vfs.__init__()", but in fact it has tail "os.sep", if it is a root (of the drive): path normalization trims tail "os.sep" off "/foo/bar/", but doesn't trim one off "/". So, just avoiding "rstrip(os.sep)" in "reporelpath()" causes regression around issue3033 fixed by fccd350acf79. This patch introduces "pathutil.normasprefix" to normalize specified path in the specific way for problematic encodings without regression around issue3033.

subrepo: avoid sanitizing ".hg/hgrc" in meta data area for non-hg subrepos Before this patch, sanitizing ".hg/hgrc" scans directories and files also in meta data area for non-hg subrepos: under ".svn" for Subversion subrepo, for example. This may cause not only performance impact (especially in large scale subrepos) but also unexpected removing meta data files. This patch avoids sanitizing ".hg/hgrc" in meta data area for non-hg subrepos. This patch stops checking "ignore" target at the first (case-insensitive) appearance of it, because continuation of scanning is meaningless in almost all cases.

subrepo: make "_sanitize()" take absolute path to the root of subrepo Before this patch, "hg update" doesn't sanitize ".hg/hgrc" in non-hg subrepos correctly, if "hg update" is executed not at the root of the parent repository. "_sanitize()" takes relative path to subrepo from the root of the parent repository, and passes it to "os.walk()". In this case, "os.walk()" expects CWD to be equal to the root of the parent repository. So, "os.walk()" can't find specified path (or may scan unexpected path), if CWD isn't equal to the root of the parent repository. Non-hg subrepo under nested hg-subrepos may cause same problem, too: CWD may be equal to the root of the outer most repository, or so. This patch makes "_sanitize()" take absolute path to the root of subrepo to sanitize correctly in such cases. This patch doesn't normalize the path to hostile files as the one relative to CWD (or the root of the outer most repository), to fix the problem in the simple way suitable for "stable". Normalizing should be done in the future: maybe as a part of the migration to vfs.