log: Allow user option of appending to log
commit18b895ec99159cf67e5c963e5720a9ae4a2d8be1
authorEric Blake <eblake@redhat.com>
Thu, 8 Nov 2018 14:15:10 +0000 (8 08:15 -0600)
committerEric Blake <eblake@redhat.com>
Fri, 9 Nov 2018 16:02:55 +0000 (9 10:02 -0600)
treee8aa5e2702db8242f9f805b55b25db29ce071749
parent2ad1177377e505306512f1bea02c979f41cb44f0
log: Allow user option of appending to log

Always truncating a log can wipe out useful history. Add an
option to change this.

Signed-off-by: Eric Blake <eblake@redhat.com>
filters/log/log.c
filters/log/nbdkit-log-filter.pod
tests/test-log.sh