Public bug reported:
When editing an ebook or setting the font embedding preferences, Calibre
cannot find any fonts at all if there exists a filename anywhere in the
font directory that contains text that is invalid UTF-8.
This can happen if the font designer's computer was in a different
LOCALE than the calibre user. For example, I had downloaded a font
designed by a man in Russia who had used Cyrillic encoding for the names
of some image files in a directory adjacent to the font.
The bug is easily repeatable. Create a file in any of your font
directories or sub-directories with an invalid sequence. For example,
from the command line, run:
mkdir -p ~/.fonts/foo
touch ~/.fonts/foo/$'fred\377juki'
When you run Calibre and try to add a font, after selecting a font file,
it will give you a dialog box saying, "ERROR: Unhandled Exception.
UnicodeDecodeError:'utf8' codec can't decode byte 0xff in position 4:
invalid start byte".
It will also print on stderr a message similar to this:
calibre, version 3.21.0
ERROR: Unhandled exception: <b>UnicodeDecodeError</b>:'utf8' codec can't decode
byte 0xff in position 4: invalid start byte
calibre 3.21 embedded-python: False is64bit: True
Linux-4.15.0-38-generic-x86_64-with-Ubuntu-18.04-bionic Linux ('64bit', '')
('Linux', '4.15.0-38-generic', '#41-Ubuntu SMP Wed Oct 10 10:59:38 UTC 2018')
Python 2.7.15rc1
Linux: ('Ubuntu', '18.04', 'bionic')
Interface language: None
Successfully initialized third party plugins: Gather KFX-ZIP (from KFX Input)
(1, 9, 0) && DeDRM (6, 6, 1) && Package KFX (from KFX Input) (1, 9, 0) && KFX
metadata reader (from KFX Input) (1, 9, 0) && KFX Input (1, 9, 0)
Traceback (most recent call last):
File "/usr/lib/calibre/calibre/gui2/font_family_chooser.py", line 299, in
add_fonts
self.font_scanner.do_scan()
File "/usr/lib/calibre/calibre/utils/fonts/scanner.py", line 327, in do_scan
files = tuple(walk(folder))
File "/usr/lib/calibre/calibre/__init__.py", line 523, in walk
for record in os.walk(dir):
File "/usr/lib/python2.7/os.py", line 286, in walk
if isdir(join(top, name)):
File "/usr/lib/python2.7/posixpath.py", line 73, in join
path += '/' + b
UnicodeDecodeError: 'utf8' codec can't decode byte 0xff in position 4: invalid
start byte
Ideally, calibre would ignore such files and continue on. However, if that is
difficult, it'd be good to catch the error and show a message telling people
something along the lines of,
Non-UTF-8 filename found somewhere in your font directories, causing
Calibre to barf.
Please find and rename the file so that Calibre can read your fonts. You
can find the
offending file like so: find (...PRINT CALIBRE FONT DIRECTORIES HERE...)
| iconv
** Affects: calibre (Ubuntu)
Importance: Undecided
Status: New
** Attachment added: "Output from calibre's standard error"
https://bugs.launchpad.net/bugs/1802183/+attachment/5210136/+files/calibre.stderr
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https://bugs.launchpad.net/bugs/1802183
Title:
fonts fail when non-UTF8 filenames exist anywhere
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