test-commit-interactive: updates for the no-execbit case This goes with c84a07530040 and 14b184263846.

test-fileset: conditionalize output with symlink

commands: the first word of each note should be capital or `hg`

revlog: avoid string slice when decompressing u* chunks Revlog chunks can be stored uncompressed. If the first byte of the raw data is \0, we store the data as is. Else we prefix it with 'u'. Before, we performed a string slice to strip out the 'u' prefix. With this patch, we use a buffer to avoid an extra memory copy and associated garbage collection overhead. I was unable to verify any performance impact of this patch. For both mozilla-central and the hg repos, the number of manifest revisions with 'u' prefixes is very small - under 1%. So this change likely isn't called enough to have an impact on manifest reading. However, the reasoning behind this change is solid, so it should be safe.

osutil: implement pure version of recvfds() for PyPy This is less portable than the C version, but PyPy can't load CPython extensions. So for now, this will be used on PyPy. I've tested it on Linux amd64 and Mac OS X.

osutil: implement recvmsg() of SCM_RIGHTS for chg command server It will be used to attach client's stdio files to a background chg command server. The socket module of Python 2.x doesn't provide recvmsg(). This could be implemented by using ctypes, but it would be less portable than the C version because the handling of socket ancillary data heavily depends on preprocessor. Also, some length fields are wrongly typed in the Linux kernel.

cleanup: back out performance hacks amended into previous commit

commands: consistently indent notes 3 spaces most notes have 3 spaces for indentation, these had 2...

perf: add perfrevlogrevision As part of investigating performance improvements to revlog reading, I needed a mechanism to measure every part of revlog reading so I knew where time was spent and how effective optimizations were. This patch implements a perf command for benchmarking the various stages of reading a single revlog revision. When executed against a manifest revision at the end of a 30,000+ long delta chain in mozilla-central, the command demonstrates that ~80% of time is spent in zlib decompression.

commands: use revlog._deltachain in debugdeltachain We have a nice API now. Use it. This does mean we introduce an extra index lookup for each revision. Considering this is a debug command, the overhead should be acceptable. We could add the chain size to revlog._deltachain(). However, that feels like avoidable overhead.