grub-btrfs: print version of the script with --version

Close #225

Signed-off-by: Pascal Jäger <pascal.jaeger@leimstift.de>

41_snapshots-btrfs

@@ -51,6 +51,27 @@ print_error()
     exit 0
 }
 
+# parse arguments
+while getopts :V-: opt; do
+    case "$opt" in
+        -)
+            case "${OPTARG}" in
+                version)
+                    printf "Version %s\n" "${GRUB_BTRFS_VERSION}" >&2 ;
+                    exit 0
+                    ;;
+            esac;;
+        V)
+            printf "Version %s\n" "${GRUB_BTRFS_VERSION}" >&2 ;
+            exit 0
+            ;;
+        *)
+            printf "Unknown flag, exiting...\n"
+            exit 0
+            ;;
+    esac
+done
+
 ## Exit the script, if:
 [[ "${GRUB_BTRFS_DISABLE,,}" == "true" ]] && print_error "GRUB_BTRFS_DISABLE is set to true (default=false)"
 if ! type btrfs >/dev/null 2>&1; then print_error "btrfs-progs isn't installed"; fi

config

@@ -1,5 +1,7 @@
 #!/usr/bin/env bash
 
+GRUB_BTRFS_VERSION=4.11-20221121
+
 # Disable grub-btrfs.
 # Default: "false"
 #GRUB_BTRFS_DISABLE="true"

grub-btrfsd

@@ -18,6 +18,12 @@ RED=$'\033[0;31m'
 CYAN=$'\033[;36m'
 RESET=$'\033[0m'
 
+sysconfdir="/etc"
+grub_btrfs_config="${sysconfdir}/default/grub-btrfs/config"
+# source config file
+[[ -f "$grub_btrfs_config" ]] && . "$grub_btrfs_config"
+[[ -f "${sysconfdir}/default/grub" ]] && . "${sysconfdir}/default/grub"
+
 print_help() {
             echo "${CYAN}[?] Usage:"
             echo "${0##*/} [-h, --help] [-t, --timeshift-auto] [-l, --log-file LOG_FILE] [-v, --verbose] [-s, --syslog] SNAPSHOTS_DIR"
@@ -29,7 +35,9 @@ print_help() {
             echo "-l, --log-file        Specify a logfile to write to"
             echo "-v, --verbose         Let the log of the daemon be more verbose"
             echo "-s, --syslog          Write to syslog"
-            echo "-h, --help            Display this message${RESET}"
+            echo "-h, --help            Display this message"
+            echo
+            echo "Version ${GRUB_BTRFS_VERSION}${RESET}"
 }
 
 log() {
@@ -81,6 +89,10 @@ while getopts :l:tvsh-: opt; do
                 syslog)
                     syslog=true
                     ;;
+                help)
+                    print_help
+                    exit 0
+                    ;;
                 *)
                     if [ "$OPTERR" = 1 ] && [ "${optspec:0:1}" != ":" ]; then
                         err "[!] Unknown option --${OPTARG}" "${RED}" >&2