contrib: add a commit synthesizer for reproducing scaling problems This adds two new commands: - analyze examines an existing repo and writes out a statistical description of its properties that contains no identifying information. - synthesize creates new commits based on the description generated by analyze. The intention is that a repo constructed using synthesize will have properties that are vaguely statistically similar to the originating repo, but entirely random content. This can be useful for forecasting performance as a repo grows, and for developers who want to find bottlenecks in proprietary repos to which they do not have access.

dirstate: handle large dates and times with masking (issue2608) Dates and times that are outside the 31-bit signed range are now compared modulo 2^31. This should prevent it from behaving badly with very large files or corrupt dates while still having a high probability of detecting changes.

exewrapper: adapt for legacy HackableMercurial We give up using CPython's PythonXX.lib import libraries (and Python.h), and now "manually" call the LoadLibrary() / GetProcAddress() Windows API's instead. If there is a "hg-python" subdirectory (the canonical directory name for HackableMercurial's private Python copy) next to the hg.exe, we load the pythonXX.dll from there (feeding an absolute path to LoadLibrary) and we set Py_SetPythonHome() to that directory, so that the Python libraries are used from there as well. If there is no "hg-python" subdir found next to the hg.exe, we do not feed an absolute path to LoadLibrary. This continues to allow to find a globally installed Python DLL, as before this change - that is, without having to edit, delete, rename, or configure anything. Note that the hg.exe built is still bound to a *specific* major version of the pythonXX.dll (e.g. python27.dll). What version it is, is inferred from the version of the python interpreter that was used when calling setup.py. For example C:\python27_x86\python.exe setup.py build_hgexe -i --compiler=mingw32 builds a hg.exe (using the mingw32 tool chain) bound to (x86) Python 2.7. And C:\python27_x86\python.exe setup.py build_hgexe -i builds the same using the Microsoft C compiler/linker. (Note that the Microsoft toolchain combined with x64 CPython can be used to build an x64 hg.exe.) setup.py is changed to write the name of the pythonlib into the generated header file "mercurial/hgpythonlib.h", which is #included by exewrapper.c. For a Python 2.7 build, it for example contains: #define HGPYTHONLIB "python27" exewrapper.c then uses HGPYTHONLIB for the name of the Python dll to load. We don't want to track mercurial/hgpythonlib.h, so we add it to .hgignore.

store: restore getsize method This method was created for subclassing.

mq: update bookmarks during qrefresh Bookmarks are updated during qpop and qpush, but they are not updated during qrefresh. This behaviour makes it hard to work on an evolving changeset at the head of a branch. qrefresh should update all bookmarks that point to the refreshed commit with the new nodeid.

templater: drop redundant return in _flatten

store: invoke "os.path.isdir()" via vfs This patch invokes "os.path.isdir()" via "rawvfs" object to avoid filename encoding, because the path passed to "os.path.isdir()" shouldn't be encoded. This patch newly adds "self.rawvfs" field only to "basicstore" and "encodedstore", because "fncachestore" has "self.rawvfs" already.

store: replace invocation of "getsize()" by "vfs.stat()" This patch replaces invocation of "getsize()", which calls "os.stat()" internally, by "vfs.stat()". The object referred by "self.rawvfs" is used internally by "_fncachevfs" and doesn't encode filename for each file API invocation. This patch invokes "os.stat()" via "self.rawvfs" to avoid redundant filename encoding: invocation of "os.stat()" via "self.vfs" hides filename encoding and encoding result from caller, so it is not appropriate, when both encoded and non-encoded filenames should be yield. Even though changeset b42b0729744d improved stream_out performance by "self.pathsep + path", this patch replaces it by "os.path.join(self.base, path)" of vfs. So, this may increase cost to join path components. But this shouldn't have large impact, because: - such cost is much less than cost of "os.stat()" which causes system call invocation - "datafiles()" of store object is invoked only for "hg manifest --all" or "hg verify" which are both heavy functions

store: invoke "os.stat()" for "createmode" initialization via vfs This just replaces "os.stat()" invocation: refactoring around "self.createmode" and "vfs.createmode" initialization is omitted. This patch also newly adds "stat()" function to "abstractvfs".

vfs: define "join()" in each classes derived from "abstractvfs" This patch defines "join()" in each classes derived from "abstractvfs" except "vfs", which already defines it. This allows all vfs instances to be used for indirect file API invocation.