Internal cache writer generates incorrect files

[shundhammer]

qdirstat /   

-> 7.8 GB total

Menu "File" -> "Write to Cache File" -> save as file "root-internal.cache.gz"

qdirstat -c root-internal.cache.gz   

-> 457 MB total

qdirstat-cache-writer / root-script.cache.gz

qdirstat -c root-script.cache.gz

-> 7.8 GB total

[shundhammer]

See also #22

[shundhammer]

This section seems to be the culprit:

D //var/lib/ucf/cache   4096    0x54c394c3
F   :etc:samba:smb.conf 9542    0x53ceef43
F   :etc:rsyslog.d:50-default.conf  1655    0x51701cf6
F   :etc:papersize  3   0x54c394c3
F   :etc:ufw:after6.rules   915 0x531104c3
F   :etc:default:grub   1307    0x5562072d
F   :etc:gconf:2:path   1421    0x533306a4
F   :etc:ufw:after.rules    1004    0x531104c3
F   :etc:ufw:before6.rules  3225    0x531104c3
F   :etc:ufw:before.rules   2667    0x531104c3

The qdirstat-perl-writer script generated this correctly - together with the (weird, but legal) colons in the file names. The internal cache writer created this:

D /var/lib/ucf/cache    4K  0x54c394c3
F       2667    0x531104c3
F       3225    0x531104c3
F       1004    0x531104c3
F       1421    0x533306a4
F       1307    0x5562072d
F       915 0x531104c3
F       3   0x54c394c3
F       1655    0x51701cf6
F       9542    0x53ceef43

So the file name column is completely missing.

OTOH it also didn't complain upon reading, so error handling leaves to be desired here, too.

[shundhammer]

Step 1 done: Improve error handling.

There are now complaints in the log for such lines in a cache file, and the cache reader gives up reading the file after 1000 such errors. The affected directories are now also marked as having a read error in the GUI (right now with a little lock on the folder icon which might be a bit misleading, but that's similar to having insufficient permissions to read a directory tree from a live file system).

[shundhammer]

Fixed.