97 lines
2.8 KiB
Bash
97 lines
2.8 KiB
Bash
#!/usr/bin/env bash
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set -euo pipefail
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usage() {
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cat <<EOF
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Usage: lab-mount <container|user> <host-path> [container-path]
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Bind-mounts a host directory into an LXC container, persisting across reboots.
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If container-path is omitted, it mirrors host-path inside the container.
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Examples:
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lab-mount alice /mnt/nas/shared # -> /mnt/nas/shared inside lxc-alice
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lab-mount alice /mnt/nas/shared /data/shared # -> /data/shared inside lxc-alice
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lab-mount lxc-alice /mnt/nas/shared # container name directly also works
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To mount for ALL containers:
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lab-mount --all /mnt/nas/shared /data/shared
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EOF
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exit 1
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}
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mount_into() {
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local CONTAINER="$1"
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local HOST_PATH="$2"
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local CONT_PATH="$3"
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local ROOTFS="/var/lib/lxc/${CONTAINER}/rootfs"
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local CONFIG="/var/lib/lxc/${CONTAINER}/config"
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if [[ ! -d "$ROOTFS" ]]; then
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echo "ERROR: container '$CONTAINER' not found" >&2
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return 1
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fi
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if [[ ! -e "$HOST_PATH" ]]; then
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echo "ERROR: host path '$HOST_PATH' does not exist" >&2
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return 1
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fi
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# create mountpoint inside rootfs
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mkdir -p "${ROOTFS}${CONT_PATH}"
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# check if this bind mount is already in config
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local ENTRY="lxc.mount.entry = ${HOST_PATH} ${CONT_PATH#/} none bind,create=dir 0 0"
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if grep -qF "$ENTRY" "$CONFIG" 2>/dev/null; then
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echo "Already configured: ${CONTAINER} ${HOST_PATH} -> ${CONT_PATH}"
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return 0
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fi
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# add persistent bind mount to container config
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echo "$ENTRY" >> "$CONFIG"
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echo "Added to config: ${CONTAINER} ${HOST_PATH} -> ${CONT_PATH}"
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# if the container is running, also mount it live
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local STATE
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STATE=$(lxc-info -n "$CONTAINER" -sH 2>/dev/null || true)
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if [[ "$STATE" == "RUNNING" ]]; then
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# lxc-attach to mount from inside
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lxc-attach --clear-env -n "$CONTAINER" -- /bin/bash -c "
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export PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
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mkdir -p '${CONT_PATH}'
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"
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# note: live bind mounts into running unprivileged containers via config
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# may require a container restart to take effect
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echo "NOTE: restart the container for the mount to take effect:"
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echo " lxc-stop -n ${CONTAINER} && lxc-start -n ${CONTAINER}"
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fi
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}
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resolve_container() {
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local NAME="$1"
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# if it already starts with lxc-, use as-is
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if [[ "$NAME" == lxc-* ]]; then
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echo "$NAME"
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elif [[ -f "/home/${NAME}/.lxc-container" ]]; then
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cat "/home/${NAME}/.lxc-container"
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else
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echo "lxc-${NAME}"
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fi
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}
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# --- parse args ---
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[[ $# -lt 2 ]] && usage
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if [[ "$1" == "--all" ]]; then
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HOST_PATH="$2"
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CONT_PATH="${3:-$HOST_PATH}"
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for dir in /var/lib/lxc/lxc-*/; do
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CONTAINER=$(basename "$dir")
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mount_into "$CONTAINER" "$HOST_PATH" "$CONT_PATH"
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done
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else
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CONTAINER=$(resolve_container "$1")
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HOST_PATH="$2"
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CONT_PATH="${3:-$HOST_PATH}"
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mount_into "$CONTAINER" "$HOST_PATH" "$CONT_PATH"
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fi
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