MidgardOS Developer Documentation

A website documenting creating the build root for MidgardOS

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Section 4 - Entering the Chroot and More Temporary Tools

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Preparing the Virtual Kernel Filesystems

One of the ways applications use to communicate with the Linux kernel is through various Virtual File Systems exposed into user-space. These filesystems expose device access, process information, and system data, among many more. To ensure that they are able to do so from within the chroot environment is to mount them inside the environment.

First, as the root user, ensure that the mountpoints required exist:

BRFS=/MidgardOS
for DIR in "dev" "proc" "sys" "run"; do
    install -d -v -m 755 -o root -g root $BRFS/$DIR
done

Mounting the Virtual Kernel Filesystems

Now that the mountpoints have been created, run the following commands to mount the Virtual Kernel Filesystems into the build root tree paths:

BRFS=/MidgardOS
mount -v -t devtmpfs devtmpfs $BRFS/dev/
mount -v -t devpts devpts -o gid=5,mode=620 $BRFS/dev/pts/
mount -v -t proc proc $BRFS/proc/
mount -v -t sysfs sysfs $BRFS/sys/
mount -v -t tmpfs tmpfs $BRFS/run/
if [ -h $BRFS/dev/shm ]; then
  install -v -d -m 1777 ${BRFS}$(realpath /dev/shm)
else
  mount -v -t tmpfs -o mode=1777,nosuid,nodev,inode64 tmpfs $BRFS/dev/shm/
fi

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