Ludovic Courtès <l...@gnu.org> skribis: > Ludovic Courtès <l...@gnu.org> skribis: > >> Apart from LibreOffice, I found that ‘share/mime/packages’ is provided >> by at least: hugin, gcr, fontforge. Most GUI packages don’t have it. >> So in practice, we’re often rebuilding the exact same database. > > On closer inspection, the time-consuming bit is processing > ‘share/mime/packages/freedesktop.org.xml’ (from ‘shared-mime-info’), > which is quite large and leads to the creation of hundreds of file. We > end up re-processing it every time. This is particularly wasteful > because the ‘shared-mime-info’ package already contains the result of > applying ‘update-mime-database’ to itself.
Based on these observations, I added a fast path to the ‘xdg-mime-database’ hook: https://git.savannah.gnu.org/cgit/guix.git/commit/?id=76ea70bd70aeb76570445c11cea2f98139192b54 It’s down to 0s in the common case where the profile doesn’t contain any packages providing ‘share/mime/packages’. Ludo’.
