Last change
on this file since 1774 was
500,
checked in by andersk, 17 years ago
|
losetup -f finds an unused loop device.
|
-
Property svn:executable set to
*
|
File size:
982 bytes
|
Line | |
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1 | #!/usr/bin/env python2.5 |
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2 | |
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3 | import sys |
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4 | import os |
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5 | from subprocess import call, Popen, PIPE |
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6 | |
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7 | def losetup(source, offset=0): |
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8 | lockfilename = '/tmp/losetup.lock' |
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9 | os.close(os.open(lockfilename, os.O_CREAT+os.O_EXCL)) #lock |
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10 | try: |
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11 | loopdevice = Popen(['losetup', '-f'], stdout=PIPE).communicate()[0].rstrip() |
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12 | if loopdevice == '': |
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13 | raise RuntimeError('out of loop devices for copying VM image: too many at once?') |
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14 | if call(['losetup', '-o', str(offset), loopdevice, source]) != 0: |
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15 | raise RuntimeError('losetup failed') |
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16 | finally: |
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17 | os.unlink(lockfilename) #unlock |
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18 | return loopdevice |
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19 | |
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20 | def main(*argv): |
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21 | args = argv[1:] |
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22 | os.environ['PATH'] = '/usr/sbin:/usr/bin:/sbin:/bin' |
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23 | if not (1 <= len(args) <= 2): |
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24 | print >>sys.stderr, 'usage: %s sourcedevice [offset]' % argv[0] |
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25 | print >>sys.stderr, 'prints resulting loopback device; don\'t forget to losetup -d' |
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26 | return 2 |
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27 | print losetup(*args) |
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28 | return 0 |
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29 | |
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30 | if __name__ == '__main__': |
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31 | sys.exit(main(*sys.argv)) |
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