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8ed3cac9e5
`Popen.wait()` will deadlock when using stdout=PIPE and/or stderr=PIPE and the child process generates large output to a pipe such that it blocks waiting for the OS pipe buffer to accept more data. Use communicate() to avoid that. This patch is commited to show the issue, a fix patch will come later. Signed-off-by: Joe Guo <joeg@catalyst.net.nz> Reviewed-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz> Reviewed-by: Andrew Bartlett <abartlet@samba.org>
54 lines
1.4 KiB
Python
Executable File
54 lines
1.4 KiB
Python
Executable File
#!/usr/bin/env python
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# Copyright (C) Catalyst IT Ltd. 2017
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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"""
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A data generator to help tests.
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Generate large output to stdout by repeating input data.
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Usage:
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python gen_output.py --data @ --repeat 1024 --retcode 1
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The above command will output @ x 1024 (1K) and exit with 1.
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"""
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import sys
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import argparse
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parser = argparse.ArgumentParser(description='Generate output data')
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parser.add_argument(
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'--data', type=str, default='$',
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help='Characters used to generate data by repeating them'
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)
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parser.add_argument(
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'--repeat', type=int, default=1024 * 1024,
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help='How many times to repeat the data'
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)
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parser.add_argument(
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'--retcode', type=int, default=0,
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help='Specify the exit code for this script'
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)
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args = parser.parse_args()
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sys.stdout.write(args.data * args.repeat)
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sys.exit(args.retcode)
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