| 1 | #!/usr/bin/env python
|
| 2 | """
|
| 3 | time.py -- Replacement for coreutils 'time'.
|
| 4 |
|
| 5 | The interface of this program is modelled after:
|
| 6 |
|
| 7 | /usr/bin/time --append --output foo.txt --format '%x %e'
|
| 8 |
|
| 9 | Problems with /usr/bin/time:
|
| 10 | - elapsed time only has 2 digits of precision
|
| 11 |
|
| 12 | Problems with bash time builtin
|
| 13 | - has no way to get the exit code
|
| 14 | - writes to stderr, so you it's annoying to get both process stderr and
|
| 15 | and
|
| 16 |
|
| 17 | This program also writes CSV directly, so you can have commas in fields, etc.
|
| 18 | """
|
| 19 |
|
| 20 | import csv
|
| 21 | import optparse
|
| 22 | import sys
|
| 23 | import subprocess
|
| 24 | import time
|
| 25 |
|
| 26 |
|
| 27 | def Options():
|
| 28 | """Returns an option parser instance."""
|
| 29 | p = optparse.OptionParser('time.py [options] ARGV...')
|
| 30 | p.add_option(
|
| 31 | '--tsv', dest='tsv', default=False, action='store_true',
|
| 32 | help='Write output in TSV format')
|
| 33 | p.add_option(
|
| 34 | '-o', '--output', dest='output', default=None,
|
| 35 | help='Name of output file to write to')
|
| 36 | p.add_option(
|
| 37 | '--field', dest='fields', default=[], action='append',
|
| 38 | help='A string to append to each row, after the exit code and status')
|
| 39 | return p
|
| 40 |
|
| 41 |
|
| 42 | def main(argv):
|
| 43 | (opts, child_argv) = Options().parse_args(argv[1:])
|
| 44 |
|
| 45 | start_time = time.time()
|
| 46 | exit_code = subprocess.call(child_argv)
|
| 47 | elapsed = time.time() - start_time
|
| 48 |
|
| 49 | fields = tuple(opts.fields)
|
| 50 | with open(opts.output, 'a') as f:
|
| 51 | if opts.tsv:
|
| 52 | # TSV output.
|
| 53 | out = csv.writer(f, delimiter='\t', doublequote=False,
|
| 54 | quoting=csv.QUOTE_NONE)
|
| 55 | else:
|
| 56 | out = csv.writer(f)
|
| 57 | row = (exit_code, '%.4f' % elapsed) + fields
|
| 58 | out.writerow(row)
|
| 59 |
|
| 60 | # Preserve the command's exit code. (This means you can't distinguish
|
| 61 | # between a failure of time.py and the command, but that's better than
|
| 62 | # swallowing the error.)
|
| 63 | return exit_code
|
| 64 |
|
| 65 |
|
| 66 | if __name__ == '__main__':
|
| 67 | sys.exit(main(sys.argv))
|