Actually cut the last dependency on //bin/echo for resume.
if [ -n "$resume" ]; then
(
- printf 'KERNEL=="%s", RUN+="/bin/echo %%M:%%m > /sys/power/resume"\n' \
+ printf "KERNEL==\"%s\", RUN+=\"/bin/sh -c 'echo %%M:%%m > /sys/power/resume'\"\n" \
${resume#/dev/}
- printf 'SYMLINK=="%s", RUN+="/bin/echo %%M:%%m > /sys/power/resume"\n' \
+ printf "SYMLINK==\"%s\", RUN+=\"/bin/sh -c 'echo %%M:%%m > /sys/power/resume'\"\n" \
${resume#/dev/}
) >> /etc/udev/rules.d/99-resume.rules
fi