nixpkgs/nixos/modules/installer/tools/nixos-enter.sh
Eelco Dolstra 60cb23001a
Add a "nixos-enter" command
This factors out the functionality in nixos-install for running a
command inside a NixOS installation (nixos-install --chroot).
2018-02-05 19:41:54 +01:00

59 lines
1.5 KiB
Bash

#! @shell@
set -e
# Re-exec ourselves in a private mount namespace so that our bind
# mounts get cleaned up automatically.
if [ "$(id -u)" = 0 ]; then
if [ -z "$NIXOS_ENTER_REEXEC" ]; then
export NIXOS_ENTER_REEXEC=1
exec unshare --mount --uts -- "$0" "$@"
else
mount --make-rprivate /
fi
fi
mountPoint=/mnt
command=("bash" "--login")
system=/nix/var/nix/profiles/system
while [ "$#" -gt 0 ]; do
i="$1"; shift 1
case "$i" in
--root)
mountPoint="$1"; shift 1
;;
--system)
system="$1"; shift 1
;;
--help)
exec man nixos-enter
exit 1
;;
--command|-c)
command=("bash" "-c" "$1")
shift 1
;;
--)
command=("$@")
break
;;
*)
echo "$0: unknown option \`$i'"
exit 1
;;
esac
done
# Set up some bind mounts we'll want regardless of chroot or not
mkdir -m 0755 -p "$mountPoint/dev" "$mountPoint/proc" "$mountPoint/sys" "$mountPoint/run"
mount --rbind /dev "$mountPoint/dev"
mount -t proc none "$mountPoint/proc"
mount -t sysfs none "$mountPoint/sys"
mount -t tmpfs none "$mountPoint/run"
# Run the activation script. Set $LOCALE_ARCHIVE to supress some Perl locale warnings.
LOCALE_ARCHIVE=$system/sw/lib/locale/locale-archive chroot "$mountPoint" "$system/activate" >&2
exec chroot "$mountPoint" "${command[@]}"