Hi,
We are looking to abort (or at least pause) a restore if a failure occurs.
More specifically, we would like the restore to stop if the MD5 checksums of
the device do not match.
When we created the image, we used the -gmf option, and are using partclone.
Since we wanted to have a single USB stick for the restoring step, after we
made the image, we then made an ISO. While making the ISO, we selected the -cmf
option. From the ISO, we make a bootable USB.
So far, so good.
Now we manually change the signature of a single item in the
sda1.files-md5sum.info.gz file to eventually cause an MD5 failure. Said
differently, we know that the restore will "fail". We are testing the process.
When it comes time to restore, it restores properly, and then starts the MD5
checksum test. We get MD5 failures. This is to be expected. The problem is that
once the error is reported, the "dirty flags" and the "tux" postprocess
continues and eventually the discovered and reported errors move off the
screen. If we were not sitting and watching the output carefully, we would not
see the failures and would erroneously believe the restore worked correctly.
In the live directory we find filesystem.squashfs and examine the contained
file usr/share/drbl/sbin/ocs-functions and look around line 12669. We see as
shown below:
LC_ALL=C zcat $chksum_file | $chksum_cmd -c | pv -N "/dev/$sum_part"
-peltf -s $chksum_file_lines \
| tee --append ${OCS_LOGFILE} | cat - > /var/log/$(to_filename
${sum_part})-${chksum_cmd}-results.log
rc_chk="${PIPESTATUS[2]}"
Is it perhaps better if the item rc_chk is set to position 1 of the PIPESTATUS
array (as shown below)?
LC_ALL=C zcat $chksum_file | $chksum_cmd -c | pv -N "/dev/$sum_part"
-peltf -s $chksum_file_lines \
| tee --append ${OCS_LOGFILE} | cat - > /var/log/$(to_filename
${sum_part})-${chksum_cmd}-results.log
rc_chk="${PIPESTATUS[1]}"
Best,
Kirk
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