TODO document minimal init

rootfs_overlay/init_lkmc.sh

@@ -0,0 +1,30 @@
+#!/bin/sh
+
+# This is an attempt to replace /etc/inittab with a single shell file,
+# in order to to make everything explicit and sane.
+#
+# The rationale is that it will make it easier to port our setup to any image
+# if our minimal init is contained in a single portable file.
+#
+# Of course, packages that rely on extra init may start failing at any
+# point with this minimized setup, but this is a risk worth taking, especially
+# because gem5 is slow and basically mandates a minimal init.
+#
+# Here we try to some basic common init tasks that will cover what the large
+# majority of software will need.
+#
+# We don't care about shutdown commands since we focus on stateless disks.
+
+export PATH=/bin:/sbin:/usr/bin:/usr/sbin
+mount -t proc proc /proc
+mkdir -p /dev/pts
+mkdir -p /dev/shm
+# TODO do mounts direclty here. fstab only adds the fschk as extra functionality,
+# but we don't care since our disks are stateless.
+mount -a
+login=/tmp/login
+printf '#!/bin/sh
+exec /bin/login root
+' > "$login"
+chmod +x "$login"
+exec /sbin/getty -n -L -l "$login" console 0 vt100