Baloo: Difference between revisions

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Revision as of 04:13, 29 June 2022

Baloo is the file indexing and file search framework for KDE Plasma, with a focus on providing a very small memory footprint along with with extremely fast searching.

Ways to communicate

Mailing List: [email protected] (info page)

IRC Channel: #kde-devel on freenode

Phabricator project: https://phabricator.kde.org/project/view/261

Top bugs and feature requests

Bugs: https://bugs.kde.org/buglist.cgi?bug_severity=critical&bug_severity=grave&bug_severity=major&bug_severity=crash&bug_severity=normal&bug_severity=minor&bug_status=UNCONFIRMED&bug_status=CONFIRMED&bug_status=ASSIGNED&bug_status=REOPENED&list_id=1629910&priority=VHI&priority=HI&product=frameworks-baloo&query_format=advanced

Feature requests: https://bugs.kde.org/buglist.cgi?bug_severity=wishlist&bug_status=UNCONFIRMED&bug_status=CONFIRMED&bug_status=ASSIGNED&bug_status=REOPENED&list_id=1629911&priority=VHI&priority=HI&product=frameworks-baloo&query_format=advanced

Indexing limitations

Baloo uses the file metadata extractors in KFileMetadata to get information about each file it indexes. This means for a file's content to be indexed

the file must have a recognizable MIME type
KDE must have an extractor for that MIME type. Use the command-line utility kmimetypefinder5 to determine a file's mime type.
- Due to a glib bug, the MIME type of HTML files can change from text/html to application/x-extension-html. The KDE file metadata extractors don't recognize the latter. That bug has a workaround to reset the MIME types to the usual values.
KFileMetadata uses the aging utilities catdoc, xls2csv, catppt to index content of files using the Microsoft Office Word, Excel, and PowerPoint file formats (source), and these utilities have undocumented limitations (bug 438455).
KFileMetadata does not index file names or file contents in ZIP archives.
KFileMetadata does not index the contents of Open Document Format files that are ZIP archives, nor does it index "flat" Open Document Format files that are complex XML files.

Other limitations:

Baloo doesn't index text files (those whose MIME type is detected as "text/something") over 10 MB (source).
The KFileMetadata extractor for text attempts to convert text to Unicode. If the file uses another encoding, such as iso-8859-1, any file contents after the first character that is invalid in Unicode will not be indexed (bug 439857). You may find the -i option to the file command-line utility useful; it tries to infer the character set of a file, e.g. file -i path/to/myfile.txt.
If a file's modification time is January 1 1970 ("zero" in the Unix epoch) or earlier, baloo will reindex it each time it starts (or you run `balooctl check`) (bug 456108), and balooshow will be confused about the file's "Mtime" if it is before January 1 1970. As a workaround you can change th e modification time to something after 1970, e.g. touch -m --date=2022-01-01 path/to/myfile.

Other Baloo pages here

Information may be obsolete.

Using Baloo

Baloo is not an application, but a daemon to index files. Applications can use the Baloo framework to provide file search results. For example, Dolphin's Content search can use Baloo.

KDE System Settings > File Search provides an intentionally limited number of settings. You can make additional adjustments in Baloo's configuration file.

balooctl

balooctl is a CLI command to perform certain operations on Baloo. Enter balooctl --help in a terminal app such as userbase:Konsole to list its available subcommands.

@@ Line 18: / Line 18: @@
 * KDE must have an extractor for that MIME type. Use the command-line utility <code>kmimetypefinder5</code> to determine a file's mime type.
 ** Due to a [https://gitlab.gnome.org/GNOME/glib/-/issues/2511#note_1293471 glib bug], the MIME type of HTML files can change from  <code>text/html</code> to <code>application/x-extension-html</code>. The KDE file metadata extractors don't recognize the latter. That bug has a workaround to reset the MIME types to the usual values.
+* KFileMetadata uses the aging utilities <code>catdoc</code>, <code>xls2csv</code>, <code>catppt</code> to index content of files using the Microsoft Office Word, Excel, and PowerPoint file formats ([https://invent.kde.org/frameworks/kfilemetadata/-/blob/master/src/extractors/officeextractor.cpp#L20 source]), and these utilities have undocumented limitations ([https://bugs.kde.org/show_bug.cgi?id=438455 bug 438455]).
+* KFileMetadata does not index file names or file contents in ZIP archives.
+* KFileMetadata does not index the contents of Open Document Format files that are ZIP archives, nor does it index "flat" Open Document Format files that are complex XML files.
 Other limitations:
 * Baloo doesn't index text files (those whose MIME type is detected as "text/''something''") over 10 MB ([https://invent.kde.org/frameworks/baloo/-/blob/master/src/file/extractor/app.cpp#L143 source]).
 * The KFileMetadata extractor for text attempts to convert text to Unicode. If the file uses another encoding, such as iso-8859-1, any file contents after the first character that is invalid in Unicode will not be indexed ([https://bugs.kde.org/show_bug.cgi?id=439857 bug 439857]). You may find the <code>-i</code> option to the <code>file</code> command-line utility useful; it tries to infer the character set of a file, e.g. <kbd>file -i ''path/to/myfile.txt''</kbd>.
+* If a file's modification time is January 1 1970 ("zero" in the Unix epoch) or earlier, baloo will reindex it each time it starts (or you run `balooctl check`) ([https://bugs.kde.org/show_bug.cgi?id=456108 bug 456108]), and <code>balooshow</code> will be confused about the file's "Mtime" if it is before January 1 1970. As a workaround you can change th e modification time to something after 1970, e.g. <kbd>touch -m --date=2022-01-01 path/to/myfile</kbd>.
 == Other Baloo pages here ==