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Add systemd.mount for Btrfs
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btrfs.org
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btrfs.org
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#+title: Btrfs
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#+setupfile: ../org-templates/page.org
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** Create systemd.mount unit for Btrfs on external HDD
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#+BEGIN_QUOTE
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internet_archive is used here as an example.
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#+END_QUOTE
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Get the UUID of the Btrfs partition.
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#+BEGIN_SRC shell
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sudo blkid -s UUID -o value /dev/sda1
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d3b5b724-a57a-49a5-ad1d-13ccf3acc52f
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#+END_SRC
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Edit ~/etc/systemd/system/mnt-internet_archive.mount.
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#+BEGIN_SRC systemd
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[Unit]
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Description=internet_archive Btrfs subvolume
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DefaultDependencies=yes
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[Mount]
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What=/dev/disk/by-uuid/d3b5b724-a57a-49a5-ad1d-13ccf3acc52f
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Where=/mnt/internet_archive
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Type=btrfs
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Options=subvol=@internet_archive,compress=zstd:1
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[Install]
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WantedBy=multi-user.target
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#+END_SRC
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- ~DefaultDependencies=yes~ : The mount unit automatically acquires ~Before=umount.target~ and ~Conflicts=umount.target~. Local filesystems automatically gain ~After=local-fs-pre.target~ and ~Before=local-fs.target~. Network mounts, such as NFS, automatically acquire ~After=remote-fs-pre.target network.target network-online.target~ and ~Before=remote-fs.target~.
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- ~Options=subvol=@internet_archive,compress=zstd:1~ : Use the subvolume ~@internet_archive~ and use zstd compression level 1.
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#+BEGIN_QUOTE
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Note that the name of the unit file, e.g. ~mnt-internet_archive.mount~, must correspond to the ~Where=/mnt/internet_archive~ directive, such that the filesystem path separator / in the ~Where~ directive is replaced by an en dash in the unit file name.
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#+END_QUOTE
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Reload the daemons and enable the mount unit.
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#+BEGIN_SRC shell
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sudo systemctl daemon-reload
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sudo systemctl enable --now mnt-internet_archive.mount
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#+END_SRC
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** Setup encrypted external drive for backups
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*** Prepare the external drive
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#+begin_src shell
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