1 files changed, 49 insertions, 0 deletions
diff --git a/raveos-calamares-theme/etc/calamares/modules/calamares-create-snapshots-subvol.sh b/raveos-calamares-theme/etc/calamares/modules/calamares-create-snapshots-subvol.sh
new file mode 100644
index 0000000..092b7b9
--- /dev/null
+++ b/raveos-calamares-theme/etc/calamares/modules/calamares-create-snapshots-subvol.sh
@@ -0,0 +1,49 @@
+#!/bin/bash
+set -e
+
+echo ">>> [snapshots-subvol] Running INSIDE target system"
+
+# Calamares' partition module ignores our btrfsSubvolumes config here and
+# always creates its own hardcoded set (/home /root /srv /var/cache
+# /var/log /var/tmp as separate subvolumes) -- there's no ".snapshots"
+# subvolume among them, which grub-btrfs/Snapper need. Create it by hand
+# as a proper top-level (subvolid=5) sibling of the other subvolumes,
+# so snapshots of "/" don't recursively include the snapshot store itself.
+
+ROOT_DEV="$(findmnt -no SOURCE / | sed 's/\[.*\]//')"
+ROOT_FS="$(findmnt -no FSTYPE /)"
+
+if [ "$ROOT_FS" != "btrfs" ]; then
+  echo ">>> [snapshots-subvol] Root is not btrfs (${ROOT_FS}), skipping."
+  exit 0
+fi
+
+if [ -d /.snapshots ] && findmnt -no SOURCE /.snapshots >/dev/null 2>&1; then
+  echo ">>> [snapshots-subvol] /.snapshots already mounted, skipping."
+  exit 0
+fi
+
+mkdir -p /mnt/topvol
+mount -o subvolid=5 "${ROOT_DEV}" /mnt/topvol
+
+if [ ! -d /mnt/topvol/@snapshots ]; then
+  btrfs subvolume create /mnt/topvol/@snapshots
+  echo ">>> [snapshots-subvol] Created @snapshots subvolume"
+else
+  echo ">>> [snapshots-subvol] @snapshots subvolume already exists"
+fi
+
+umount /mnt/topvol
+rmdir /mnt/topvol
+
+mkdir -p /.snapshots
+
+ROOT_UUID="$(blkid -s UUID -o value "${ROOT_DEV}")"
+if ! grep -q '/.snapshots' /etc/fstab; then
+  echo "UUID=${ROOT_UUID} /.snapshots btrfs rw,noatime,compress=zstd:3,discard=async,space_cache=v2,subvol=/@snapshots 0 0" >> /etc/fstab
+  echo ">>> [snapshots-subvol] Added /.snapshots to fstab"
+fi
+
+mount /.snapshots
+
+echo ">>> [snapshots-subvol] Done."