apt-file calls run-parts with options --list and --regex:
root@neopili:~/curro/qtec/qt5022/build-qt5022-cesium/build/tmp/work/bobcat_64-poky-linux/apt/0.9.9.4-r0/apt-0.9.9.4# grep run-parts cmdline/apt-key -rn
187: for trusted in $(run-parts --list $TRUSTEDPARTS --regex '^.*\.gpg$'); do
busybox implementation of run-parts does not support --regex. And --list option is not enabled on yocto busybox configuration.
Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@gmail.com> Signed-off-by: Ross Burton <ross.burton@intel.com>