Hey, Le mer. 6 oct. 2021 à 17:57, Christoph Anton Mitterer <cales...@scientia.net> a écrit : > > Hey. > > I've just wondered whether there is recommended way to find out whether > one is currently "within" the initramfs (i.e. early boot) as generated > by Debians initramfs-tools, or not? > > I'd have probably done something like checking for: > if [ -f /conf/initramfs.conf ] && [ -f /scripts/init-top/ORDER ] && [ ! -e > /usr/bin/dpkg ]; then > echo within initramfs > else > echo not within initramfs > fi > > Or are /conf/initramfs.conf and /scripts/init-top/ORDER not necessarily > included? > > The check for dpkg (which shouldn't be present in the initramfs, unless > someone includes it for whichever reason) would have been to rule out > the cases where someone created the other files in his normal > userspace. > > > Any better ideas? :D
Quickly, few ideas (perhaps not the perfect ones): 1. Check for what is currently mounted as "/" ? (which technically should differ between initramfs or real rootfs) 2. Check if your binaries are running inside a klibc or busybox context (both are supported via an initramfs) ? 3. Check if systemd is running ? (so you have started userspace processes part of your real rootfs) > > > Thanks, > Chris. > Regards, Romain
