def set_tape_file_number(drive, num=0):
if num == 0:
return rewind_tape(drive)
current_num = get_tape_file_number(drive)
if num < current_num:
op = 'bsfm'
new_num = current_num - num + 1
else:
new_num = num - current_num
if new_num > 0:
op = 'fsf'
elif new_num == 0:
return
cmd = 'mt -f %s %s %d' % (drive, op, new_num)
p = Popen(cmd, shell=True, stdout=PIPE, stderr=PIPE)
out, err = p.communicate()
if p.returncode == 1:
raise MTInvalidOperationOrDeviceNameException(err)
elif p.returncode == 2:
raise MTFailedOperationException(err)
return out
def set_tape_file_number(drive, num=0):
if num == 0:
return rewind_tape(drive)
current_num = get_tape_file_number(drive)
new_num, op = get_tape_op_and_count(current_num, num)
cmd = 'mt -f %s %s %d' % (drive, op, new_num)
p = Popen(cmd,
shell=True,
stdout=PIPE,
stderr=PIPE,
universal_newlines=True)
logger.debug('Setting file number of {drive} to {num}: {cmd}'.format(
num=num, drive=drive, cmd=cmd))
out, err = p.communicate()
if p.returncode:
logger.error(
'Failed to set tape file number of {drive} to {num}: {err}'.format(
drive=drive, num=num, err=err))
if p.returncode == 1:
raise MTInvalidOperationOrDeviceNameException(err)
elif p.returncode == 2:
raise MTFailedOperationException(err)
logger.debug('File number of {drive} set to {num}'.format(num=num,
drive=drive))
return out
def rewind_tape(drive):
"""
Rewinds the tape in the given drive
"""
cmd = 'mt -f %s rewind' % (drive)
p = Popen(cmd,
shell=True,
stdout=PIPE,
stderr=PIPE,
universal_newlines=True)
logger.debug('Rewinding tape in {drive}: {cmd}'.format(drive=drive,
cmd=cmd))
out, err = p.communicate()
if p.returncode:
logger.error(
'Failed to rewind tape in {drive}, err: {err}, returncode: {rcode}'
.format(drive=drive, err=err, rcode=p.returncode))
if p.returncode == 1:
raise MTInvalidOperationOrDeviceNameException(err)
elif p.returncode == 2:
raise MTFailedOperationException(err)
logger.debug('Rewinded tape in {drive}'.format(drive=drive))
return out
def set_tape_file_number(drive, num=0):
if num == 0:
return rewind_tape(drive)
current_num = get_tape_file_number(drive)
if num < current_num:
op = 'bsfm'
new_num = current_num - num + 1
else:
new_num = num - current_num
if new_num > 0:
op = 'fsf'
elif new_num == 0:
# We are already on the correct file, ensure we are at the beginning
op = 'bsfm'
new_num = 1
cmd = 'mt -f %s %s %d' % (drive, op, new_num)
p = Popen(cmd, shell=True, stdout=PIPE, stderr=PIPE)
logger.debug('Setting file number of {drive} to {num}: {cmd}'.format(num=num, drive=drive, cmd=cmd))
out, err = p.communicate()
if p.returncode:
logger.error('Failed to set tape file number of {drive} to {num}: {err}'.format(drive=drive, num=num, err=err))
if p.returncode == 1:
raise MTInvalidOperationOrDeviceNameException(err)
elif p.returncode == 2:
raise MTFailedOperationException(err)
logger.debug('File number of {drive} set to {num}'.format(num=num, drive=drive))
return out
def get_tape_file_number(drive):
cmd = 'mt -f %s status | grep -i "file number"' % drive
p = Popen(cmd, shell=True, stdout=PIPE, stderr=PIPE)
out, err = p.communicate()
if p.returncode == 1:
raise MTInvalidOperationOrDeviceNameException(err)
elif p.returncode == 2:
raise MTFailedOperationException(err)
return int(out.split(',')[0].split('=')[1])
def rewind_tape(drive):
"""
Rewinds the tape in the given drive
"""
cmd = 'mt -f %s rewind' % (drive)
p = Popen(cmd, shell=True, stdout=PIPE, stderr=PIPE)
out, err = p.communicate()
if p.returncode == 1:
raise MTInvalidOperationOrDeviceNameException(err)
elif p.returncode == 2:
raise MTFailedOperationException(err)
return out
def get_tape_file_number(drive):
cmd = 'mt -f %s status | grep -i "file number"' % drive
p = Popen(cmd, shell=True, stdout=PIPE, stderr=PIPE)
logger.debug('Getting tape file number of {drive}: {cmd}'.format(drive=drive, cmd=cmd))
out, err = p.communicate()
if p.returncode:
logger.error('Failed to get tape file number of {drive}'.format(drive=drive))
if p.returncode == 1:
raise MTInvalidOperationOrDeviceNameException(err)
elif p.returncode == 2:
raise MTFailedOperationException(err)
file_number = int(out.split(',')[0].split('=')[1])
logger.debug('Got {num} as file number of {drive}'.format(num=file_number, drive=drive))
return file_number