From 32d0a60024f0549f85250f565f126a6ffa39c11b Mon Sep 17 00:00:00 2001
From: Andrew Cady <d@jerkface.net>
Date: Sun, 21 May 2023 20:24:22 -0400
Subject: move config file to /etc

---
 go.sh | 23 +++++++++++++++++++----
 1 file changed, 19 insertions(+), 4 deletions(-)

diff --git a/go.sh b/go.sh
index 23d06d0..65aa592 100755
--- a/go.sh
+++ b/go.sh
@@ -1,5 +1,12 @@
 #!/bin/bash
 MAX_AGE_SECONDS=60
+CONFIG_DIR=/etc/btrfs-backup/remotes
+
+die()
+{
+        printf 'Error: %s\n' "$*" >&2
+        exit 1
+}
 
 read_config()
 {
@@ -45,13 +52,20 @@ check_user_is_root
 
 if [ $# = 1 ]
 then
-        config_file=$1
+        case "$1" in
+                '' ) die 'config file name is blank' ;;
+                */*) die 'config file name must not contain "/"' ;;
+                *.json) ;;
+                *) die "config file name must end in '.json'" ;;
+        esac
+        config_file=$CONFIG_DIR/$1
+        config_file_temp=$CONFIG_DIR/.$1~tmp
 else
         echo "Usage: $0 <config.json>" >&2
         exit 1
 fi
 
-[ -r "$config_file" ]
+[ -r "$config_file" ] || die "config file does not exist: $config_file"
 exec 3<>"$config_file"
 flock -n 3
 declare -A config
@@ -86,8 +100,9 @@ then
 fi
 
 btrfs send ${remote_head:+ -p "$remote_head"} -- "$local_head" | pv | btrfs receive -- "$dst"
-jq --arg h "$local_head" '. | .head=$h' <"$config_file" >."$config_file"~tmp
-mv -T -- ."$config_file"~tmp "$config_file"
+jq --arg h "$local_head" '. | .head=$h' <"$config_file" >"$config_file_temp"
+# TODO: btrfs subvolume delete "$remote_head" but first check for other config files!
+mv -T -- "$config_file_temp" "$config_file"
 
 ### OK, basic idea:
 #
-- 
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