feat: add auto-detection for Fedora distribution

Fedora uses non-standard paths and command names for GRUB (e.g., /boot/grub2 instead of /boot/grub, and grub2-mkconfig).
This change adds a conditional block to detect Fedora via /etc/fedora-release and automatically sets the appropriate variables, improving the out-of-the-box experience for Fedora users.

Author: reynegton

config

@@ -3,6 +3,14 @@
 
 GRUB_BTRFS_VERSION=4.13-yabsnap_info_support-2024-03-06T13:43:57+00:00
 
+# Distribution specific auto-detection (e.g. Fedora)
+if [ -f /etc/fedora-release ]; then
+    GRUB_BTRFS_GRUB_DIRNAME="/boot/grub2"
+    GRUB_BTRFS_GBTRFS_DIRNAME="/boot/grub2"
+    GRUB_BTRFS_MKCONFIG="grub2-mkconfig"
+    GRUB_BTRFS_SCRIPT_CHECK="grub2-script-check"
+fi
+
 # Disable grub-btrfs.
 # Default: "false"
 #GRUB_BTRFS_DISABLE="true"

temp/grub-btrfs.8

@@ -102,6 +102,14 @@ Default: “false”
 .IP \(em 4
 Example: \fCGRUB_BTRFS_OVERRIDE_BOOT_PARTITION_DETECTION="true"\fP
 
+.SS "\GRUB_BTRFS_ENABLE_CRYPTODISK\fP"
+.PP
+Enable booting from snapshots stored on LUKS encrypted devices
+.IP \(em 4
+Default: “false”
+.IP \(em 4
+Example: \GRUB_BTRFS_ENABLE_CRYPTODISK="true"\fP
+
 .SS "CUSTOM KERNELS"
 .SS "\fCGRUB_BTRFS_NKERNEL\fP / \fCGRUB_BTRFS_NINIT\fP / \fCGRUB_BTRFS_CUSTOM_MICROCODE\fP"
 .PP