Params generated is at wrong position

[Indusy]

menuentry '|         Date        |        Snapshot       |  Type  |Description|' { echo }
submenu '| 2023-10-05 17:00:11 | @snapshots/2/snapshot | single | timeline  |' {
    submenu '| 2023-10-05 17:00:11 | @snapshots/2/snapshot | single | timeline |' { echo }

    menuentry '  vmlinuz-linux & initramfs-linux-fallback.img & amd-ucode.img' --class snapshots --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-snapshots-9539aebd-43bb-453c-a6cd-4547399adcef' {
        if [ x$feature_all_video_module = xy ]; then
        insmod all_video
        fi
        set gfxpayload=keep
        insmod btrfs
        if [ x$feature_platform_search_hint = xy ]; then
            search --no-floppy --fs-uuid  --set=root  9539aebd-43bb-453c-a6cd-4547399adcef
        else
            search --no-floppy --fs-uuid  --set=root 9539aebd-43bb-453c-a6cd-4547399adcef
        fi
        echo 'Loading Snapshot: 2023-10-05 17:00:11 @snapshots/2/snapshot'
        echo 'Loading Kernel: vmlinuz-linux ...'
        linux "/@snapshots/2/snapshot/boot/vmlinuz-linux" root=UUID=9539aebd-43bb-453c-a6cd-4547399adcef  loglevel=3 quiet splash radeon.si_support=0 amdgpu.si_support=1  rootflags=rw,relatime,compress=lzo,ssd,discard=async,space_cache=v2
rw,noatime,nodiratime,compress=lzo,ssd,discard=async,space_cache=v2,subvol="@snapshots/2/snapshot"
        echo 'Loading Microcode & Initramfs: amd-ucode.img initramfs-linux-fallback.img ...'
        initrd "/@snapshots/2/snapshot/boot/amd-ucode.img" "/@snapshots/2/snapshot/boot/initramfs-linux-fallback.img"
    }

    menuentry '  vmlinuz-linux & initramfs-linux.img & amd-ucode.img' --class snapshots --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-snapshots-9539aebd-43bb-453c-a6cd-4547399adcef' {
        if [ x$feature_all_video_module = xy ]; then
        insmod all_video
        fi
        set gfxpayload=keep
        insmod btrfs
        if [ x$feature_platform_search_hint = xy ]; then
            search --no-floppy --fs-uuid  --set=root  9539aebd-43bb-453c-a6cd-4547399adcef
        else
            search --no-floppy --fs-uuid  --set=root 9539aebd-43bb-453c-a6cd-4547399adcef
        fi
        echo 'Loading Snapshot: 2023-10-05 17:00:11 @snapshots/2/snapshot'
        echo 'Loading Kernel: vmlinuz-linux ...'
        linux "/@snapshots/2/snapshot/boot/vmlinuz-linux" root=UUID=9539aebd-43bb-453c-a6cd-4547399adcef  loglevel=3 quiet splash radeon.si_support=0 amdgpu.si_support=1  rootflags=rw,relatime,compress=lzo,ssd,discard=async,space_cache=v2
rw,noatime,nodiratime,compress=lzo,ssd,discard=async,space_cache=v2,subvol="@snapshots/2/snapshot"
        echo 'Loading Microcode & Initramfs: amd-ucode.img initramfs-linux.img ...'
        initrd "/@snapshots/2/snapshot/boot/amd-ucode.img" "/@snapshots/2/snapshot/boot/initramfs-linux.img"
    }
}

When I boot a snapshot of snapper, it ran into "Root device mounted successfully, but /sbin/init does not exist.", I checked the new_root dir, it list @ @snapshots @log ..., I find the kernel params of /boot/grub/grub-btrfs.cfg:

...
rootflags=rw,relatime,compress=lzo,ssd,discard=async,space_cache=v2
rw,noatime,nodiratime,compress=lzo,ssd,discard=async,space_cache=v2,subvol="@snapshots/2/snapshot"
...

has parts of duplicate, i change it to

rootflags=rw,noatime,nodiratime,compress=lzo,ssd,discard=async,space_cache=v2,subvol="@snapshots/2/snapshot"

then it boot correctly.

My English is not so good, but how to make it automatically?

[Schievel1]

Can you also paste your grub-btrfs config? The file is /etc/default/grub-btrfs/config

[Indusy]

Here is my config @Schievel1

#!/usr/bin/env bash


GRUB_BTRFS_VERSION=4.12-master-2023-04-28T16:26:00+00:00

# Disable grub-btrfs.
# Default: "false"
#GRUB_BTRFS_DISABLE="true"

# Name appearing in the Grub menu.
# Default: "Use distribution information from /etc/os-release."
#GRUB_BTRFS_SUBMENUNAME="Arch Linux snapshots"

# Custom title.
# Shows/Hides "date" "snapshot" "type" "description" in the Grub menu, custom order available.
# Default: ("date" "snapshot" "type" "description")
#GRUB_BTRFS_TITLE_FORMAT=("date" "snapshot" "type" "description")

# Limit the number of snapshots populated in the GRUB menu.
# Default: "50"
#GRUB_BTRFS_LIMIT="50"

# Sort the found subvolumes by "ogeneration" or "generation" or "path" or "rootid".
# # See Sorting section to https://btrfs.wiki.kernel.org/index.php/Manpage/btrfs-subvolume#SUBCOMMAND
# "-rootid" means list snapshot by new ones first.
# Default: "-rootid"
#GRUB_BTRFS_SUBVOLUME_SORT="+ogen,-gen,path,rootid"

# Show snapshots found during run "grub-mkconfig"
# Default: "true"
#GRUB_BTRFS_SHOW_SNAPSHOTS_FOUND="false"

# Show Total of snapshots found during run "grub-mkconfig"
# Default: "true"
#GRUB_BTRFS_SHOW_TOTAL_SNAPSHOTS_FOUND="true"

# By default, "grub-btrfs" automatically detects most existing kernels.
# If you have one or more custom kernels, you can add them here.
# Default: ("")
#GRUB_BTRFS_NKERNEL=("kernel-custom" "vmlinux-custom")

# By default, "grub-btrfs" automatically detects most existing initramfs.
# If you have one or more custom initramfs, you can add them here.
# Default: ("")
#GRUB_BTRFS_NINIT=("initramfs-custom.img" "initrd-custom.img" "otherinit-custom.gz")

# By default, "grub-btrfs" automatically detects most existing microcodes.
# If you have one or more custom microcodes, you can add them here.
# Default: ("")
#GRUB_BTRFS_CUSTOM_MICROCODE=("custom-ucode.img" "custom-uc.img "custom_ucode.cpio")

# Additonal kernel command line parameters that should be passed to the kernel
# when booting a snapshot.
# For dracut based distros this could be useful to pass "rd.live.overlay.overlayfs=1"
# or "rd.live.overlay.readonly=1" to the Kernel for booting snapshots read only.
# Default: ""
#GRUB_BTRFS_SNAPSHOT_KERNEL_PARAMETERS="rd.live.overlay.overlayfs=1"

# Comma seperated mount options to be used when booting a snapshot.
# They can be defined here as well as in the "/" line inside the respective snapshots'
# "/etc/fstab" files.  Mount options found in both places are combined, and this variable
# takes priority over `fstab` entries.
# NB: Do NOT include "subvol=..." or "subvolid=..." here.
# Default: ""
#GRUB_BTRFS_ROOTFLAGS="space_cache,commit=10,norecovery"

# Ignore specific path during run "grub-mkconfig".
# Only exact paths are ignored.
# e.g : if `specific path` = @, only `@` snapshot will be ignored.
# Default: ("@")
GRUB_BTRFS_IGNORE_SPECIFIC_PATH=("@")

# Ignore prefix path during run "grub-mkconfig".
# Any path starting with the specified string will be ignored.
# e.g : if `prefix path` = @, all snapshots beginning with "@/..." will be ignored.
# Default: ("var/lib/docker" "@var/lib/docker" "@/var/lib/docker")
GRUB_BTRFS_IGNORE_PREFIX_PATH=("var/lib/docker" "@var/lib/docker" "@/var/lib/docker")

# Ignore specific type/tag of snapshot during run "grub-mkconfig".
# For snapper:
# Type = single, pre, post.
# For Timeshift:
# Tag = boot, ondemand, hourly, daily, weekly, monthly.
# Default: ("")
#GRUB_BTRFS_IGNORE_SNAPSHOT_TYPE=("")

# Ignore specific description of snapshot during run "grub-mkconfig".
# e.g: timeline
# Default: ("")
#GRUB_BTRFS_IGNORE_SNAPSHOT_DESCRIPTION=("")

# By default "grub-btrfs" automatically detects your boot partition,
# either located at the system root or on a separate partition or in a subvolume,
# Change to "true" if your boot partition isn't detected as separate.
# Default: "false"
#GRUB_BTRFS_OVERRIDE_BOOT_PARTITION_DETECTION="true"

# Location of the folder containing the "grub.cfg" file.
# Might be grub2 on some systems.
# Default: "/boot/grub"
#GRUB_BTRFS_GRUB_DIRNAME="/boot/grub2"

# Location of kernels/initramfs/microcode.
# Use by "grub-btrfs" to detect the boot partition and the location of kernels/initrafms/microcodes.
# Default: "/boot"
#GRUB_BTRFS_BOOT_DIRNAME="/boot"

# Location where grub-btrfs.cfg should be saved.
# Some distributions (like OpenSuSE) store those files at the snapshot directory
# instead of boot. Be aware that this direcory must be available for grub during
# startup of the system.
# Default: $GRUB_BTRFS_GRUB_DIRNAME
#GRUB_BTRFS_GBTRFS_DIRNAME="/boot/grub"

# Location of the directory where Grub searches for the grub-btrfs.cfg file.
# Some distributions (like OpenSuSE) store those file at the snapshot directory
# instead of boot. Be aware that this direcory must be available for grub during
# startup of the system.
# Default: "\${prefix}" # This is a grub variable that resolves to where grub is
# installed. (like /boot/grub, /boot/efi/grub)
# NOTE: If variables of grub are used here (like ${prefix}) they need to be escaped
# with `\` before the `$`
#GRUB_BTRFS_GBTRFS_SEARCH_DIRNAME="\${prefix}"


# Name/path of grub-mkconfig command, use by "grub-btrfs.service"
# Might be 'grub2-mkconfig' on some systems (Fedora ...)
# Default paths are /sbin:/bin:/usr/sbin:/usr/bin,
# if your path is missing, report it on the upstream project.
# For example, on Fedora : "/sbin/grub2-mkconfig"
# You can use only name or full path.
# Default: grub-mkconfig
#GRUB_BTRFS_MKCONFIG=/usr/bin/grub2-mkconfig

# Name of grub-script-check command, use by "grub-btrfs"
# Might be 'grub2-script-check' on some systems (Fedora ...)
# For example, on Fedora : "grub2-script-check"
# Default: grub-script-check
#GRUB_BTRFS_SCRIPT_CHECK=grub2-script-check

# Path of grub-mkconfig_lib file, use by "grub-btrfs"
# Might be '/usr/share/grub2/grub-mkconfig_lib' on some systems (Opensuse ...)
# Default: /usr/share/grub/grub-mkconfig_lib
#GRUB_BTRFS_MKCONFIG_LIB=/usr/share/grub2/grub-mkconfig_lib

# Password protection management for submenu,snapshots
# Refer to the Grub documentation https://www.gnu.org/software/grub/manual/grub/grub.html#Authentication-and-authorisation
# and this comment https://github.com/Antynea/grub-btrfs/issues/95#issuecomment-682295660
#
# Add authorized usernames separate by comma (foo,bar)
# When Grub's password protection is enabled, the superuser is authorized by default, it isn't necessary to add it
# Default: ""
#GRUB_BTRFS_PROTECTION_AUTHORIZED_USERS="foo,bar"
#
# Disable authentication support for submenu of Grub-btrfs only (--unrestricted)
# doesn't work if GRUB_BTRFS_PROTECTION_AUTHORIZED_USERS isn't empty
# Default: "false"
#GRUB_BTRFS_DISABLE_PROTECTION_SUBMENU="true"

[Schievel1]

huh honestly I have no idea why grub creates that two times for you.