Sorry, I missed this.
How about creating your tool with FcConfigGetFontDirs()? I don't get why fc-cache needs to have such options. fc-cache isn't an interface to make the config readable.
On Fri, Jun 9, 2017 at 10:11 AM, Chris Lamb <lamby@xxxxxxxxxx> wrote:
Hi,
Whilst working on the Reproducible Builds[0] effort, we noticed that
fontconfig — in its usual usage — generates un-reproducible cache files.
This is due to it using the timestamps of each directory in the
"checksum" member of the _FcCache struct. This is so that it can identify
which cache files remain valid and/or require regeneration.
Whilst we could zero-out the checksum, we would actually need it still
function correctly. Therefore, I've attached a patch that adds an option
to list all the configured font directories; that way, distributions,
etc. can modify the mtimes of these files in advance
For example, I'm about to propose the following to Debian's fontconfig
"postinst" script:
if [ -n "$SOURCE_DATE_EPOCH" ]; then
fc-cache -s --list-dirs | \
xargs -I{} find {} -type d -follow -newermt "@$SOURCE_DATE_EPOCH" -print0 2>/dev/null | \
xargs -0r touch --date="@$SOURCE_DATE_EPOCH"
fi
… and then we make the usual calls to, for example:
$ fc-cache -s -f -v
(This work was sponsored by Tails[1].)
[0] https://reproducible-builds.org/
[1] https://tails.boum.org/
Regards,
--
,''`.
: :' : Chris Lamb
`. `'` lamby@xxxxxxxxxx / chris-lamb.co.uk
`-
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