Re: [Libguestfs] [PATCH 1/3] febootstrap/helper/init: make sure /proc is mounted into chroot.

* Richard W.M. Jones: Yeah, I just noticed that the second call to print_uptime() failed and fixed that -- not thinking about why the uptime was printed at all. Good question. The init script that Debian's initramfs-tools put into the initrd do mount /proc and a number of other filesystems, so I think makes sense to do something similar in the init script that is installed by febootstrap -- at least on Debian systems. This is the initialization code from initramfs-tools version 0.98.8 from squeeze (stable): ,---- | [ -d /dev ] || mkdir -m 0755 /dev | [ -d /root ] || mkdir -m 0700 /root | [ -d /sys ] || mkdir /sys | [ -d /proc ] || mkdir /proc | [ -d /tmp ] || mkdir /tmp | mkdir -p /var/lock | mount -t sysfs -o nodev,noexec,nosuid none /sys | mount -t proc -o nodev,noexec,nosuid none /proc | | # Note that this only becomes /dev on the real filesystem if udev's scripts | # are used; which they will be, but it's worth pointing out | tmpfs_size="10M" | if [ -e /etc/udev/udev.conf ]; then | . /etc/udev/udev.conf | fi | if ! mount -t devtmpfs -o mode=0755 none /dev; then | echo "W: devtmpfs not available, falling back to tmpfs for /dev" | mount -t tmpfs -o size=$tmpfs_size,mode=0755 udev /dev | [ -e /dev/console ] || mknod -m 0600 /dev/console c 5 1 | [ -e /dev/null ] || mknod /dev/null c 1 3 | fi | mkdir /dev/pts | mount -t devpts -o noexec,nosuid,gid=5,mode=0620 none /dev/pts || true | > /dev/.initramfs-tools | mkdir /dev/.initramfs `---- After that, the command line parameters are parsed, some package-provided scripts are sourced, and finally the root filesystem is mounted. Just before the init script on the root fs is called, existing mounts are moved: ,---- | mount -n -o move /sys ${rootmnt}/sys | mount -n -o move /proc ${rootmnt}/proc `---- (I wonder why /dev isn't moved, though.) The most notable change introduced in initramfs-tools 0.99 (current unstable) is that init also puts a tmpfs under /run which is later moved into the root filesystem: ,---- | mount -t tmpfs -o "nosuid,size=20%,mode=0755" tmpfs /run `---- I haven't looked at how RedHat and Fedora systems behave before mounting the root fs but having all the mounts set up by the init that lives in the initrd does make sense to me. This is the init script that is execl()'d by febootstrap's init, correct? -Hilko