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[BUG] --fsck-rm-unused does not work

96d3a9fe04be4156a15da6924b5508a9
PREFER SOCIABLE REVENGE

From: Maximilian Gaukler <development@maxgaukler.de>
Date: Sun, 28 Aug 2016 19:43:13 +0200

   Aborting backups with Ctrl-C causes leftover unused nodes that `obnam 
   fsck --fsck-rm-unused` cannot remove. I have attached a script to 
   reproduce and test this case. The "crash-limit" option did not seem to 
   cause these problems.
   
   By the way, is there any way to get a return status from `obnam fsck` to 
   see if there were any errors?
From: Maximilian Gaukler <development@maxgaukler.de>
Date: Sun, 28 Aug 2016 22:27:48 +0200

   After diving deeper into the code, I found that this was temporarily 
   disabled because the new repo format will not support it.
   
   Since as far as I understand the new format is not yet ready, I would 
   suggest to re-enable this option for the old repo format '6'. A 
   suggested patch and a corrected version of my reproducer script 
   integrated into setup.py can be found at
   
   https://github.com/fau-fablab/obnam.git
   branch:  mg/unused-chunks-for-lars
   
   _______________________________________________
   obnam-dev mailing list
   obnam-dev@obnam.org
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From: Lars Wirzenius <liw@liw.fi>
Date: Mon, 26 Dec 2016 18:20:03 +0200

   Thank you for you changes. Overall, I wish someone would tackle fsck
   and write a new one that's actually good. The current one leaves a lot
   to be desired.
   
   On Sun, Aug 28, 2016 at 10:27:48PM +0200, Maximilian Gaukler wrote:
   > After diving deeper into the code, I found that this was temporarily
   > disabled because the new repo format will not support it.
   
   Correct.
   
   > Since as far as I understand the new format is not yet ready, I would
   > suggest to re-enable this option for the old repo format '6'. A suggested
   > patch and a corrected version of my reproducer script integrated into
   > setup.py can be found at
   
   I'm not against this, but it does make things a bit further
   complicated, alas.
   
   > https://github.com/fau-fablab/obnam.git
   > branch:  mg/unused-chunks-for-lars
   
   I'm afraid running the new fsck test fails for me. The output ends
   with:
   
   ----
   chunk 4618508678920486487 not used by anyone
   Checking 32/32: extra chunks
   + grep -q 'chunk [0-9]* not used by anyone' /tmp/tmp.NQSOEmtiLO/out2
   ERROR: Command '['./test-fsck']' returned non-zero exit status 1
   ----
   
   The full output:
   
   ----
   liw@exolobe3[liw/from-mg](obnam)$ ./check -f
   run fsck tests
   ++ mktemp -d
   + tempdir=/tmp/tmp.NQSOEmtiLO
   + mkdir /tmp/tmp.NQSOEmtiLO/R /tmp/tmp.NQSOEmtiLO/L
   + R=/tmp/tmp.NQSOEmtiLO/R
   + L=/tmp/tmp.NQSOEmtiLO/L
   + genbackupdata --create=1337 /tmp/tmp.NQSOEmtiLO/L
   Generating backup data: /tmp/tmp.NQSOEmtiLO/L
   1.3 KiB of 1.3 KiB 100 % (347.3 KiB/s)
   --h--m--s #########################################################################################################################
   + obnam --root=/tmp/tmp.NQSOEmtiLO/L --repository=/tmp/tmp.NQSOEmtiLO/R backup
   Backed up 5 files (of 5 found), containing 1.0 KiB.
   Uploaded 1.0 KiB file data in 0s at 25.1 KiB/s average speed.
   Total download amount 217.0 B.
   Total upload amount 260.0 KiB. Overhead was 259.0 KiB (99.6 %).
   + obnam --root=/tmp/tmp.NQSOEmtiLO/L --repository=/tmp/tmp.NQSOEmtiLO/R fsck
   
   + genbackupdata --create=13371337 /tmp/tmp.NQSOEmtiLO/L
   Generating backup data: /tmp/tmp.NQSOEmtiLO/L
   12.75 MiB of 12.75 MiB 100 % (107.01 MiB/s)
   --h--m--s #########################################################################################################################
   + timeout 1 obnam --root=/tmp/tmp.NQSOEmtiLO/L --repository=/tmp/tmp.NQSOEmtiLO/R backup
   00h00m00s Backing up: found 99 files, 1.52 MiB; uploaded: 1.52 MiB
   /tmp/tmp.NQSOEmtiLO/L/0/0/0/98+ obnam --root=/tmp/tmp.NQSOEmtiLO/L --repository=/tmp/tmp.NQSOEmtiLO/R force-lock
   ++ mktemp
   + output=/tmp/tmp.dnWHrH7Sxb
   + obnam --root=/tmp/tmp.NQSOEmtiLO/L --repository=/tmp/tmp.NQSOEmtiLO/R fsck --quiet
   chunk 4618508678920486364 not used by anyone
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   + obnam --root=/tmp/tmp.NQSOEmtiLO/L --repository=/tmp/tmp.NQSOEmtiLO/R fsck --fsck-fix --fsck-rm-unused
   + tee /tmp/tmp.NQSOEmtiLO/out1
   chunk 4618508678920486364 not used by anyone; deleting
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   Checking 36/36: extra chunks
   + grep -q 'chunk [0-9]* not used by anyone' /tmp/tmp.NQSOEmtiLO/out1
   + obnam --root=/tmp/tmp.NQSOEmtiLO/L --repository=/tmp/tmp.NQSOEmtiLO/R fsck
   + tee /tmp/tmp.NQSOEmtiLO/out2
   chunk 4618508678920486364 not used by anyone
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   Checking 32/32: extra chunks
   + grep -q 'chunk [0-9]* not used by anyone' /tmp/tmp.NQSOEmtiLO/out2
   ERROR: Command '['./test-fsck']' returned non-zero exit status 1
   ----