Date: Fri, 8 Feb 2019 16:01:58 -0500 From: George Mitchell <george+freebsd@m5p.com> To: freebsd-hackers@freebsd.org Subject: Re: Non-interactive multivolume restore Message-ID: <1f2f42bb-adf9-db72-25ba-b8a7a89e5b32@m5p.com> In-Reply-To: <fc745866-cb34-17ae-9e4c-53e330a672c8@m5p.com> References: <5fc87495-8fdc-c1f3-0b95-8609347794f0@m5p.com> <alpine.BSF.2.20.1902041440510.35838@puchar.net> <32330.1549288285@critter.freebsd.dk> <5e7f90d8-d4a6-9ae3-3e92-2abc3103c683@m5p.com> <fc745866-cb34-17ae-9e4c-53e330a672c8@m5p.com>
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From: George Mitchell <george+freebsd@m5p.com>
To: freebsd-hackers@freebsd.org
Message-ID: <1f2f42bb-adf9-db72-25ba-b8a7a89e5b32@m5p.com>
Subject: Re: Non-interactive multivolume restore
References: <5fc87495-8fdc-c1f3-0b95-8609347794f0@m5p.com>
<alpine.BSF.2.20.1902041440510.35838@puchar.net>
<32330.1549288285@critter.freebsd.dk>
<5e7f90d8-d4a6-9ae3-3e92-2abc3103c683@m5p.com>
<fc745866-cb34-17ae-9e4c-53e330a672c8@m5p.com>
In-Reply-To: <fc745866-cb34-17ae-9e4c-53e330a672c8@m5p.com>
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Apparently people don't often have to restore multivolume dumps. (I
rarely do it myself except that I'm in the middle of compiling an index
of a plethora of ancient dumps before purging them.) Since it requires
a lot of interaction (as least as far as I have been able to determine),
I've writtien this silly python program to help out. It relies on
misc/py-pexpect, which happily compiles in a py36 version that doesn't
run, so this program specifies python2.7:
---------------------------------------------------------------------
#!/usr/bin/env python2.7
from __future__ import print_function
import pexpect
import sys
import os
if len(sys.argv )< 2 or (len(sys.argv) =3D=3D 2 and sys.argv[1] =3D=3D '-=
h'):
print('''
Non-interactively restore from a multivolume dump. You can use a
glob to specify the dump volume if the glob expands to the files in
the correct order. Creates symbolic links to your dumps in $TMPDIR
(or /tmp by default) and runs 'restore' with the -P option. Generates
responses as needed to keep the restore program running.
''')
print('You did not specify any dump volumes.')
sys.exit(1)
tmpdir =3D os.getenv('TMPDIR') or '/tmp'
for i, volume in enumerate(sys.argv[1:]):
try:
os.remove(tmpdir + '/dumpvolume' + str(i + 1))
except:
pass
os.symlink(sys.argv[i + 1], tmpdir + '/dumpvolume' + str(i + 1))
child =3D pexpect.spawn("/sbin/restore -x -P 'cat " + tmpdir +
"/dumpvolume$RESTORE_VOLUME'")
child.logfile =3D sys.stdout
while True:
resp =3D child.expect(['Specify next volume #: ', 'default: ',
"set owner/mode for '.'. .yn. ", pexpect.EOF],
timeout=3D600)
if resp =3D=3D 0:
child.sendline('1')
elif resp =3D=3D 1:
child.sendline('')
elif resp =3D=3D 2:
child.sendline('y')
else:
break
for i in len(sys.argv[1:]):
os.delete(tmpdir + '/dumpvolume' + str(i + 1))
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