revset: add depth limit to descendants() (issue5374)
This is naive implementation using two-pass scanning. Tracking descendants
isn't an easy problem if both start and stop depths are specified. It's
impractical to remember all possible depths of each node while scanning from
roots to descendants because the number of depths explodes. Instead, we could
cache (min, max) depths as a good approximation and track ancestors back when
needed, but that's likely to have off-by-one bug.
Since this implementation appears not significantly slower, and is quite
straightforward, I think it's good enough for practical use cases. The time
and space complexity is O(n) ish.
revisions:
0) 1-pass scanning with (min, max)-depth cache (worst-case quadratic)
1) 2-pass scanning (this version)
repository:
mozilla-central
# descendants(0) (for reference)
*) 0.430353
# descendants(0, depth=1000)
0) 0.264889
1) 0.398289
# descendants(limit(tip:0, 1, offset=10000), depth=1000)
0) 0.025478
1) 0.029099
# descendants(0, depth=2000, startdepth=1000)
0) painfully slow (due to quadratic backtracking of ancestors)
1) 1.531138
#!/bin/bash
# This file is directly inspired by
# https://github.com/pypa/python-manylinux-demo/blob/master/travis/build-wheels.sh
set -e -x
PYTHON_TARGETS=$(ls -d /opt/python/cp2*/bin)
# Create an user for the tests
useradd hgbuilder
# Bypass uid/gid problems
cp -R /src /io && chown -R hgbuilder:hgbuilder /io
# Compile wheels for Python 2.X
for PYBIN in $PYTHON_TARGETS; do
"${PYBIN}/pip" wheel /io/ -w wheelhouse/
done
# Bundle external shared libraries into the wheels with
# auditwheel (https://github.com/pypa/auditwheel) repair.
# It also fix the ABI tag on the wheel making it pip installable.
for whl in wheelhouse/*.whl; do
auditwheel repair "$whl" -w /src/wheelhouse/
done
# Install packages and run the tests for all Python versions
cd /io/tests/
for PYBIN in $PYTHON_TARGETS; do
# Install mercurial wheel as root
"${PYBIN}/pip" install mercurial --no-index -f /src/wheelhouse
# But run tests as hgbuilder user (non-root)
su hgbuilder -c "\"${PYBIN}/python\" /io/tests/run-tests.py --with-hg=\"${PYBIN}/hg\" --blacklist=/io/contrib/linux-wheel-centos5-blacklist"
done