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[PATCH] Harden os.system
From: Bryan O'Sullivan <bos@serpentine.com>
Add util.system function. This is similar to os.system, but will
either succeed (if the process finishes with a zero exit code) or raise
a util.CommandError (if the process exits uncleanly or is killed by
a signal).
Add util.explain_exit function. This tends to be ubiquitous in code
that calls other processes, and must describe what has gone wrong.
Change some uses of os.system over to util.system.
manifest hash: e3bf4adcac5b915432ec0af00efdbcef86bea4b1
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import and startup cleanups
add commands:run()
add copyright notice to commands
eliminate/reorganize imports to speed up start time:
0.5b:
$ time bash -c 'for i in `seq 100`; do ~/bin/hg > /dev/null; done'
real 0m7.718s
user 0m6.719s
sys 0m0.794s
new:
$ time bash -c 'for i in `seq 100`; do hg > /dev/null; done'
real 0m2.171s
user 0m1.684s
sys 0m0.444s
just python:
$ time bash -c 'for i in `seq 100`; do python -c pass; done'
real 0m0.988s
user 0m0.771s
sys 0m0.207s
Ignoring the fixed cost of loading the Python interpreter, we're 5.6
times faster. With the Python load time, we're still 3.5 times faster.
manifest hash: acce5882a55c76eb165316f5741724c8ce4ef587
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