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The following is what I get in journal -u grub-brtrfs -b once I create a new snapshot:
Dec 29 14:30:53 localhost.localdomain bash[92458]: /usr/sbin/grub2-mkconfig: line 274: /boot/grub/grub.cfg.new: No such file or directory
Dec 29 14:30:53 localhost.localdomain systemd[1]: grub-btrfs.service: Main process exited, code=exited, status=1/FAILURE
Dec 29 14:30:53 localhost.localdomain systemd[1]: grub-btrfs.service: Failed with result 'exit-code'.
Dec 29 14:30:53 localhost.localdomain systemd[1]: Failed to start Regenerate grub-btrfs.cfg.
Dec 29 14:30:53 localhost.localdomain systemd[1]: grub-btrfs.service: Consumed 1.967s CPU time.
I'm on Fedora 33 kernel 5.9.16-200.fc33.x86_64 and built grub-btrfs manually. Here is my config:
#!/usr/bin/env bash
# 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"
# Add a name ahead your snapshots entries in the Grub menu.
# Default: "Snapshot:"
#GRUB_BTRFS_PREFIXENTRY="Snapshot:"
# Show full path snapshot or only name in the Grub menu, weird reaction with snapper.
# Default: "true"
#GRUB_BTRFS_DISPLAY_PATH_SNAPSHOT="false"
# Custom title.
# shows/hides p"prefix" d"date" n"name" in the Grub menu, separator "/", custom order available.
# Default: "p/d/n"
#GRUB_BTRFS_TITLE_FORMAT="p/d/n"
# 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")
# 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")
# By default "grub-btrfs" automatically detects your boot partition,
# either located at the system root or on a separate partition,
# but cannot detect if it is in a subvolume.
# Change to "true" if you have a boot partition in a different subvolume.
# Default: "false"
#GRUB_BTRFS_OVERRIDE_BOOT_PARTITION_DETECTION="true"
# Location of the folder containing the "grub.cfg" file.
# Use by grub-btrfs to save the file "grub-btrfs.cfg".
# Might be grub2 on some systems.
# For example, on Fedora with EFI : "/boot/efi/EFI/fedora"
# Default: "/boot/grub"
GRUB_BTRFS_GRUB_DIRNAME="/boot/efi/EFI/fedora"
# 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"
# Name/path of grub-mkconfig, use by "grub-btrfs.service"
# Might be 'grub2-mkconfig' on some systems
# For example, on Fedora : "/sbin/grub2-mkconfig"
# Default: /usr/bin/grub-mkconfig
GRUB_BTRFS_MKCONFIG="/usr/sbin/grub2-mkconfig"
# Snapper
# Snapper's config name to use
# Default: "root"
GRUB_BTRFS_SNAPPER_CONFIG="@root"
# 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"
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