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This is an automatically generated e-mail. To reply, visit:
<a href="http://git.reviewboard.kde.org/r/105488/">http://git.reviewboard.kde.org/r/105488/</a>
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<div>Review request for Amarok and Ralf Engels.</div>
<div>By Matěj Laitl.</div>
<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Description </h1>
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<pre style="margin: 0; padding: 0; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">SqlScanResultProcessor: debugging; not intended to be merged to master
SqlScanResultProcessor: don't accidentally delete tracks, defensive rewrite
This fixes data-loss that I can trigger every time by toggling "Local
Files & USB Mass Storage Backend" in Config -> Plugins, restarting
Amarok and triggering collection update / rescan.
In theory, more things such as cloning changing disk could trigger this
problem, from SqlScanResultProcessor::deleteDeletedDirectories() comment:
We need to match directories by their (absolute) path, otherwise following
scenario triggers statistics loss (perhaps bugs 298275, 292245):
1. user relocates collection to different filesystem, but clones path structure
or toggles MassStorageDeviceHandler enabled in Config -> plugins.
2. collectionscanner knows nothings about directory ids, so it doesn't detect
any track changes and emits a bunch of skipped (unchanged) dirs with no
tracks.
3. SqlRegistry::getDirectory() called there from returns different directory id
then in past.
4. deleteDeletedDirectories() is called, and if it operates on directory ids,
it happily removes _all_ directories, taking tracks with it.
5. Tracks disappear from the UI until full rescan, stats, lyrics, labels are
lost forever.
Also add a handful of asserts, ScanResultProcessor is very complicated
and small error or corner-case in logic may result in horrible data
losses.
Reporters of linked bugs, please try to reproduce your data-loss with
this patch applied and report back in both cases. In negative case,
please reopen and attach full updated amarok --debug log.
After this patch, only (statistics, lyrics and labels)-loss operations
should be:
a) moving track out of mounted collection folders [by design]
b) changing both metadata and url from outside of a track not tagged
by amarok_afttagger [we can do nothing about this]
c) changing the meta-data within Amarok followed by moving the track
(within or outside of Amarok) not tagged by amarok_afttagger
[bug 292245, I think I know the cause now]
BUG: 298275
CCBUG: 292245
FIXED-IN: 2.6
REVIEW: 105488
SqlMeta::Track: remove unused methods deviceId() and rpath()
There will be made misleading by the next commit, so better not to have
them at all. id() and urlId() are unused, too, but these are at least
in theory useful.
SqlScanResultProcessor: remove dead code, sanitize includes
SqlRegistry, DatabaseUpdater: delete stats and everything in removeTrack()
SqlRegistry::removeTrack() had code to remove the entry from the tracks
table and to preserve the entry in the statistics table. This doesn't
work, because SqlRegistry construction calls
DatabaseUpdater::deleteAllRedundant( url ) on next start-up that
removes the url entry, plus we don't know how long we should keep the
entry, so we just delete everything. ScanResultProcessor should be
witty enough not to delete tracks that have been moved to another
directory and/or device, even if it is currently unavailable.
Additionally, we clean up the statistics, urls_labels, lyrics tables
on start-up to avoid stale entries (pointing to deleted url) in a way
similar to what it is done with other tables.
SqlScanResultProcessor: rename attributes in preparation for a fix
...because I was really confused by the old names.</pre>
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<b style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Bugs: </b>
<a href="https://bugs.kde.org/show_bug.cgi?id=292245">292245</a>,
<a href="https://bugs.kde.org/show_bug.cgi?id=298275">298275</a>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Diffs</b> </h1>
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<li>src/core-impl/collections/db/sql/DatabaseUpdater.h <span style="color: grey">(57af65de0e3cbea5d7b7693f2d586eb1fe823870)</span></li>
<li>src/core-impl/collections/db/sql/DatabaseUpdater.cpp <span style="color: grey">(59e071d2f4fc69d79196e22e9119ff02805f28ca)</span></li>
<li>src/core-impl/collections/db/sql/SqlMeta.h <span style="color: grey">(8ee1014eb160547c4cbc0ea5571c12a895a79c64)</span></li>
<li>src/core-impl/collections/db/sql/SqlMeta.cpp <span style="color: grey">(a9b678aa4e3e55a2394da6f6581c159580fe6fc5)</span></li>
<li>src/core-impl/collections/db/sql/SqlRegistry.h <span style="color: grey">(8d801178cc070c7772363d28d86ca63467996ebe)</span></li>
<li>src/core-impl/collections/db/sql/SqlRegistry.cpp <span style="color: grey">(1b9efe5490bebc849b6c52c0b0b3fd51a5565418)</span></li>
<li>src/core-impl/collections/db/sql/SqlScanResultProcessor.h <span style="color: grey">(1bd96db03363cf8f760811fb231fd9facf521e8e)</span></li>
<li>src/core-impl/collections/db/sql/SqlScanResultProcessor.cpp <span style="color: grey">(6699b982e124193d068e2bd093bf0d15d6e34a9c)</span></li>
</ul>
<p><a href="http://git.reviewboard.kde.org/r/105488/diff/" style="margin-left: 3em;">View Diff</a></p>
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