Add a script to automatically mount datasets.
This commit is contained in:
Tom Alexander
parent
d7a8dd4d67
commit
683c264650
GPG Key ID:
D3A179C9A53C0EDE
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@ -9,7 +9,7 @@
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# - zsh
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# - network
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# - sshd
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# - base
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- base
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# - firewall
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# - cpu
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# - ntp
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@ -27,4 +27,4 @@
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# - fuse
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# - autofs
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# - exfat
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- bhyve
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# - bhyve
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@ -0,0 +1,126 @@
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#!/usr/local/bin/bash
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#
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# Mount non-boot-environment datasets.
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#
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# We can't leave datasets outside the boot environment (for example,
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# jails or bhyve VMs) as canmount=on because then every boot
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# environment's external datasets would all attempt to mount every
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# time. To work around this, we mark those datasets as canmount=noauto
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# and run this script to mount datasets under the root of our boot
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# environment. This script depends heavily on my zfs dataset structure
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# so it needs to be improved to be robust enough for different
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# layouts. An example of my layout is:
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#
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## NAME MOUNTPOINT CANMOUNT TA:BEMOUNT
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## zroot none off -
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## zroot/global /global on -
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## zroot/freebsd none on -
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## zroot/freebsd/13.1-RELEASE none on -
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## zroot/freebsd/13.1-RELEASE/be none on -
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## zroot/freebsd/13.1-RELEASE/be/main / noauto -
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## zroot/freebsd/13.1-RELEASE/jails none on -
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## zroot/freebsd/13.1-RELEASE/jails/foo /jail/foo noauto on
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## zroot/freebsd/13.1-RELEASE/jails/bar /jail/bar noauto on
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## zroot/freebsd/13.1-RELEASE/jails/baz /jail/baz noauto on
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## zroot/freebsd/13.1-RELEASE/vm-bhyve /vm noauto on
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## zroot/linux none on -
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## zroot/linux/arch none on -
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## zroot/linux/arch/be none on -
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## zroot/linux/arch/be/main / noauto -
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set -euo pipefail
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IFS=$'\n\t'
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DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
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function main {
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local all_zfs_datasets=$(zfs list -Hp -o 'name,mountpoint,canmount,ta:bemount,mounted')
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local root_dataset=$(find_root_dataset "$all_zfs_datasets")
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local datasets_to_mount=$(find_datasets_to_mount_for_boot_environment "$all_zfs_datasets" "$root_dataset")
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if [ -n "$datasets_to_mount" ]; then
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mount_datasets "$datasets_to_mount"
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fi
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}
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function reverse_lines {
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sed '1!x;H;1h;$!d;g'
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}
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function find_dataset {
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local all_zfs_datasets="$1"
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local dataset_name="$2"
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while read dataset; do
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local ds_name=$(awk '{print $1}'<<<"$dataset")
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if [ "$ds_name" = "$dataset_name" ]; then
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echo "$dataset"
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return
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fi
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done<<<"$all_zfs_datasets"
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}
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function find_root_dataset {
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local all_zfs_datasets="$1"
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while read dataset; do
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local ds_name=$(awk '{print $1}'<<<"$dataset")
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local ds_mountpoint=$(awk '{print $2}'<<<"$dataset")
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# local ds_canmount=$(awk '{print $3}'<<<"$dataset")
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# local ds_bemount=$(awk '{print $4}'<<<"$dataset")
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local ds_mounted=$(awk '{print $5}'<<<"$dataset")
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if [ "$ds_mounted" = "yes" ] && [ "$ds_mountpoint" = "/" ]; then
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echo "$ds_name"
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return
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fi
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done<<<"$all_zfs_datasets"
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}
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function find_datasets_to_mount_for_boot_environment {
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local all_zfs_datasets="$1"
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local root_dataset="$2"
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# This is a consequence of my layout for zfs datasets. I should
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# make this more robust. Perhaps a zfs property like search up
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# from dataset mounted at / until you find a dataset with property
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# ta:bemountroot="on"?
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local be_root_name="${root_dataset%/*/*}"
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local be_root_dataset=$(find_dataset "$all_zfs_datasets" "$be_root_name")
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while read dataset; do
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local ds_name=$(awk '{print $1}'<<<"$dataset")
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# local ds_mountpoint=$(awk '{print $2}'<<<"$dataset")
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local ds_canmount=$(awk '{print $3}'<<<"$dataset")
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local ds_bemount=$(awk '{print $4}'<<<"$dataset")
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local ds_mounted=$(awk '{print $5}'<<<"$dataset")
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case "$ds_name" in
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"${be_root_name}/"*) ;;
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*) continue ;;
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esac
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if [ "$ds_bemount" != "on" ]; then
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continue
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fi
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if [ "$ds_mounted" != "no" ]; then
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continue
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fi
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if [ "$ds_canmount" != "noauto" ]; then
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continue
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fi
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echo "$dataset"
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done<<<"$all_zfs_datasets"
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}
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function mount_datasets {
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local datasets_to_mount=$(reverse_lines<<<"$1")
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while read dataset; do
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local ds_name=$(awk '{print $1}'<<<"$dataset")
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local ds_mountpoint=$(awk '{print $2}'<<<"$dataset")
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local ds_canmount=$(awk '{print $3}'<<<"$dataset")
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local ds_bemount=$(awk '{print $4}'<<<"$dataset")
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local ds_mounted=$(awk '{print $5}'<<<"$dataset")
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mount -v -t zfs "$ds_name" "$ds_mountpoint"
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done<<<"$datasets_to_mount"
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}
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main
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@ -0,0 +1,20 @@
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#!/bin/sh
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#
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# REQUIRE: FILESYSTEM kld
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# PROVIDE: bemount
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. /etc/rc.subr
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name=bemount
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rcvar=${name}_enable
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start_cmd="${name}_start"
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stop_cmd="${name}_stop"
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load_rc_config $name
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bemount_start() {
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/usr/local/bin/bemount
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}
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bemount_stop() {
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}
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run_rc_command "$1"
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@ -94,3 +94,31 @@
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src: tmpfs
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fstype: tmpfs
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opts: rw,mode=777
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- name: Install scripts
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copy:
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src: "files/{{ item.src }}"
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dest: "{{ item.dest }}"
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mode: 0755
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owner: root
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group: wheel
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loop:
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- src: bemount.bash
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dest: /usr/local/bin/bemount
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- name: Install rc script
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copy:
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src: "files/{{ item.src }}"
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dest: "/usr/local/etc/rc.d/{{ item.dest|default(item.src) }}"
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owner: root
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group: wheel
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mode: 0755
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loop:
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- src: bemount_rc.sh
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dest: bemount
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- name: Enable bemount
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community.general.sysrc:
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name: bemount_enable
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value: "YES"
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path: /etc/rc.conf.d/bemount
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