109 lines
3 KiB
Bash
109 lines
3 KiB
Bash
#! @runtimeShell@
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# shellcheck shell=bash
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set -e
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# Re-exec ourselves in a private mount namespace so that our bind
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# mounts get cleaned up automatically.
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if [ -z "$NIXOS_ENTER_REEXEC" ]; then
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export NIXOS_ENTER_REEXEC=1
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if [ "$(id -u)" != 0 ]; then
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extraFlags="-r"
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fi
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exec unshare --fork --mount --uts --mount-proc --pid $extraFlags -- "$0" "$@"
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else
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mount --make-rprivate /
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fi
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mountPoint=/mnt
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system=/nix/var/nix/profiles/system
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command=("$system/sw/bin/bash" "--login")
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silent=0
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while [ "$#" -gt 0 ]; do
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i="$1"; shift 1
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case "$i" in
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--root)
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mountPoint="$1"; shift 1
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;;
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--system)
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system="$1"; shift 1
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;;
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--help)
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exec man nixos-enter
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exit 1
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;;
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--command|-c)
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command=("$system/sw/bin/bash" "-c" "$1")
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shift 1
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;;
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--silent)
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silent=1
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;;
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--)
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command=("$@")
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break
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;;
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*)
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echo "$0: unknown option \`$i'"
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exit 1
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;;
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esac
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done
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if [[ ! -e $mountPoint/etc/NIXOS ]]; then
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echo "$0: '$mountPoint' is not a NixOS installation" >&2
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exit 126
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fi
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mkdir -p "$mountPoint/dev" "$mountPoint/sys"
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chmod 0755 "$mountPoint/dev" "$mountPoint/sys"
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mount --rbind /dev "$mountPoint/dev"
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mount --rbind /sys "$mountPoint/sys"
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# modified from https://github.com/archlinux/arch-install-scripts/blob/bb04ab435a5a89cd5e5ee821783477bc80db797f/arch-chroot.in#L26-L52
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chroot_add_resolv_conf() {
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local chrootDir="$1" resolvConf="$1/etc/resolv.conf"
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[[ -e /etc/resolv.conf ]] || return 0
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# Handle resolv.conf as a symlink to somewhere else.
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if [[ -L "$resolvConf" ]]; then
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# readlink(1) should always give us *something* since we know at this point
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# it's a symlink. For simplicity, ignore the case of nested symlinks.
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# We also ignore the possibility of `../`s escaping the root.
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resolvConf="$(readlink "$resolvConf")"
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if [[ "$resolvConf" = /* ]]; then
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resolvConf="$chrootDir$resolvConf"
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else
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resolvConf="$chrootDir/etc/$resolvConf"
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fi
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fi
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# ensure file exists to bind mount over
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if [[ ! -f "$resolvConf" ]]; then
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install -Dm644 /dev/null "$resolvConf" || return 1
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fi
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mount --bind /etc/resolv.conf "$resolvConf"
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}
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chroot_add_resolv_conf "$mountPoint" || echo "$0: failed to set up resolv.conf" >&2
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(
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# If silent, write both stdout and stderr of activation script to /dev/null
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# otherwise, write both streams to stderr of this process
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if [ "$silent" -eq 1 ]; then
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exec 2>/dev/null
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fi
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# Run the activation script. Set $LOCALE_ARCHIVE to supress some Perl locale warnings.
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LOCALE_ARCHIVE="$system/sw/lib/locale/locale-archive" IN_NIXOS_ENTER=1 chroot "$mountPoint" "$system/activate" 1>&2 || true
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# Create /tmp
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chroot "$mountPoint" systemd-tmpfiles --create --remove --exclude-prefix=/dev 1>&2 || true
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)
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unset TMPDIR
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exec chroot "$mountPoint" "${command[@]}"
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