trigger font-config errors by making $HOME/.fontconfig not writable

In [1]:

!ls -la $HOME
!fc-cache

total 36
drwxr-xr-x 1 test root 4096 Aug  6 11:12 .
drwxr-xr-x 1 root root 4096 Aug  6 11:12 ..
drwxr-xr-x 2 root root 4096 Aug  6 11:12 .cache
drwxr-xr-x 2 root root 4096 Aug  6 11:12 .fontconfig
drwxr-xr-x 2 test test 4096 Aug  6 11:12 .fonts
drwxr-xr-x 3 test test 4096 Aug  6 11:12 .ipython
drwxr-xr-x 4 test test 4096 Aug  6 11:12 .jupyter
drwxr-xr-x 3 test test 4096 Aug  6 11:12 .local
Fontconfig error: No writable cache directories
Fontconfig error: No writable cache directories
/home/test/.fonts: failed to write cache

importing weasyprint triggers font-config errors:

In [2]:

import weasyprint

Fontconfig error: No writable cache directories

repeated imports don't trigger module load, so no repeated output:

In [3]:

import weasyprint

but we can trigger fcinit again

In [4]:

from weasyprint.text.fonts import fontconfig
fontconfig.FcInitLoadConfigAndFonts();

Fontconfig error: No writable cache directories

(restart kernel)

using wurlitzer.pipes() suppresses output during import:

In [1]:

import wurlitzer

with wurlitzer.pipes():
    import weasyprint

(restart kernel)

importing fontconfig submodule triggers output because import weasyprint is implied any time a submodule is imported

In [1]:

import sys
from weasyprint.text.fonts import fontconfig
'weasyprint' in sys.modules

Fontconfig error: No writable cache directories

Out[1]:

True

import weasyprint does nothing because it's already been run

In [2]:

import weasyprint

In [3]:

fontconfig.FcInitLoadConfigAndFonts();

Fontconfig error: No writable cache directories

In [4]:

import wurlitzer
with wurlitzer.pipes():
    fontconfig.FcInitLoadConfigAndFonts();

(restart kernel)

the example in https://github.com/minrk/wurlitzer/issues/92

In [1]:

import sys
import wurlitzer
from weasyprint.text.fonts import fontconfig

sys.stderr.flush()
print("after import")

with wurlitzer.pipes():
    fontconfig.FcInitLoadConfigAndFonts();

Fontconfig error: No writable cache directories

after import

Running a second time produces no output, because the output was produced by the import:

In [2]:

import sys
import wurlitzer
from weasyprint.text.fonts import fontconfig

sys.stderr.flush()
print("after import")

with wurlitzer.pipes():
    fontconfig.FcInitLoadConfigAndFonts();

after import

(restart kernel)

same example, also capturing output for the import:

In [1]:

import wurlitzer
with wurlitzer.pipes():
    from weasyprint.text.fonts import fontconfig

with wurlitzer.pipes():
    fontconfig.FcInitLoadConfigAndFonts();