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231582dd0f
When a lock is acquired by mtools, it does not ensure it releases the lock before exit. Workaround this by doing a blocking lock and unlock after any invocation of mtools.
53 lines
1.9 KiB
Python
53 lines
1.9 KiB
Python
#!/usr/bin/python
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# This will take a given directory and make a 'big floppy image'
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# out of it, suitable for nodemedia upload.
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import fcntl
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import glob
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import os
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import subprocess
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import sys
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def create_image(directory, image):
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ents = 0
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datasz = 512
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for dir in os.walk(sys.argv[1]):
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ents += 1
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for filen in dir[2]:
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ents += 1
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filename = os.path.join(dir[0], filen)
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currsz = os.path.getsize(filename)
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# assuming up to 65k cluster
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currsz = (currsz // 512 +1) * 512
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datasz += currsz
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datasz += ents * 32768
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datasz = datasz // 512 + 1
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with open(image, 'wb') as imgfile:
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imgfile.seek(datasz * 512 - 1)
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imgfile.write(b'\x00')
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subprocess.check_call(['mformat', '-i', image, '-r', '16', '-d', '1', '-t',
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str(datasz), '-s', '1','-h', '1', '::'])
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# Some clustered filesystems will have the lock from mformat
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# linger after close (mformat doesn't unlock)
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# do a blocking wait for shared lock and then explicitly
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# unlock between calls to mtools
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with open(image, 'rb') as imgfile:
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fcntl.flock(imgfile.fileno(), fcntl.LOCK_SH)
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fcntl.flock(imgfile.fileno(), fcntl.LOCK_UN)
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cpycmd = ['mcopy', '-i', image, '-s']
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cpycmd.extend(glob.glob('{0}/*'.format(directory)))
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cpycmd.append('::')
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subprocess.check_call(cpycmd)
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# though not necessary for us, make sure dir2img doesn't have a lingering
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# flock from mcopy for any subsequent commands
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with open(image, 'rb') as imgfile:
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fcntl.flock(imgfile.fileno(), fcntl.LOCK_SH)
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fcntl.flock(imgfile.fileno(), fcntl.LOCK_UN)
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if __name__ == '__main__':
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if len(sys.argv) < 3:
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sys.stderr.write("Usage: {0} <directory> <imagefile>".format(
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sys.argv[0]))
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sys.exit(1)
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create_image(sys.argv[1], sys.argv[2]) |