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#!/usr/bin/env python3 |
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#exec tail -n +3 $0 |
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# Be careful not to change |
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# the 'exec tail' line above. |
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# This script lives in /etc/grub.d/ |
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# 2015,2022 Ralph Versteegen |
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# The menuentry template was orginally generated by /etc/grub.d/10_linux |
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import os |
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import glob |
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import re |
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import sys |
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import subprocess |
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def tell(*args): |
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print(*args, file = sys.stderr) |
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def run(cmd): |
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tell(cmd) |
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ret = subprocess.check_output(cmd.split()).decode('utf-8').rstrip() |
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tell(" ->", ret) |
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return ret |
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# Don't use initrd; the kernel image has it builtin and this breaks it |
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# I blame the patch applied in the SlackBuild to GRUB2 which makes it look for /boot/initrd.gz... |
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#################### bootflags |
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# Useful kernel params: |
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# rootdelay= [KNL] Delay (in seconds) to pause before attempting to |
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# mount the root filesystem |
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# S [KNL] Run init in single mode |
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# libata.force=1.00:1.5,norst,udma4 or udma3 pio4 etc |
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bootflags = "rootflags=subvol=root rootfstype=btrfs ro" |
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#################### disks |
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# Find HDD and SSD devices which have mounted partitions |
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disks = {} |
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for part in ("/mnt/btrfs_ssd", "/mnt/btrfs_pool", "/mnt/btrfs_hdd"): |
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if not os.path.isdir(part): |
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continue |
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part_dev = run("findmnt -vfn -o SOURCE " + part) |
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if part not in disks: |
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# Trim the partition number, to get disk's device |
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disks[part] = re.match("[^0-9]*", part_dev).group(0) |
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tell("Found disks:", disks) |
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#################### Entry for each disk |
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for disk_path,disk_dev in disks.items(): |
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# PARTUUID of the root's btrfs partition |
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# PARTUUID shown by "lsblk -f -o +PARTUUID,SIZE", and by gdisk 'i' (information) as "Partition unique GUID" |
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# It is stored in MBR or GPT |
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root_partuuid = run("findmnt -vfn -o PARTUUID " + disk_path) |
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# Check fstab for a /mnt/boot entry |
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# It's also possible to search HDD for LABEL=boot using blkid |
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#boot_dev = run("findmnt -vfn -o UUID /mnt/boot") |
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# Check for a partition labelled "boot" |
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try: |
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boot_dev = run("blkid -t LABEL=boot -o device " + " ".join(glob.glob(disk_dev + "*"))) |
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#if boot_dev: |
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tell("Found boot partition " + boot_dev) |
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boot_uuid = run("lsblk -n -o UUID " + boot_dev) |
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#else: |
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except subprocess.CalledProcessError: |
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# No boot partition, using /boot |
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# UUID aka FS UUID is stored in the FS itself |
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boot_uuid = run("findmnt -vfn -o UUID " + disk_path) |
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template = """ |
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menuentry 'Slackware GNU/Linux {NAME}' --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-simple-new' {{ |
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load_video |
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insmod gzio |
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insmod part_msdos |
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insmod part_gpt |
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insmod btrfs |
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insmod ext2 |
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echo 'Searching for boot partition...' |
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search.fs_uuid {BOOTUUID} root |
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echo 'Loading Linux from' $root |
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linux /root/boot/{IMAGE} {BOOTFLAGS} root=PARTUUID={ROOTPARTUUID} |
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}} |
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""" |
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for image_name in ("vmlinuz", "vmlinuz-backup"): |
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image_path = disk_path + "/root/boot/" + image_name |
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if os.path.isfile(image_path): |
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name = os.readlink(image_path) + " on " + disk_path |
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print(template.format(ROOTPARTUUID = root_partuuid, |
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BOOTUUID = boot_uuid, |
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BOOTFLAGS = bootflags, |
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IMAGE = image_name, |
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NAME = name)) |
rversteegen created this gist