use snapper configuration file

README.md

@@ -20,15 +20,23 @@ the scripts are located at `/usr/share/libalpm/hooks.bin/snap-pac`.
 
 ## Configuration
 
-The configuration file is located at `/etc/snap-pac.conf`. There you can choose
-which snapper configurations, descriptions, and cleanup algorithm to use.
-Changing the file should be self-explanatory.  The defaults should be sufficient
-for most users.
+Configuration is done via the snapper configuration files, with extra variables
+specific to these pacman hooks. The defaults should be suitable for most users.
+The following are possible settings you can place in each snapper configuration
+file:
 
-By default, the snapshots are set up to use snapper's `number` algorithm.
-Additionally, by default, snapshots are only taken of the subvolume
-corresponding with the `root` snapper configuration. Descriptions are of the
-pacman command that initiated the snapshots.
+* `PACMAN_PRE_POST` - perform pacman pre/post snapshots for this configuration.
+  Default is `"no"` for all configurations, except for the `root` configuration
+which is "`yes"`.
+* `PACMAN_CLEANUP_ALGORITHM` - snapper algorithm used in cleaning up the pacman pre/post
+  snapshots. Default is `"number"`.
+* `PACMAN_PRE_DESCRIPTION` - snapper description used for the pacman pre snapshot.
+  Default is the pacman command that called the snapshot.
+* `PACMAN_POST_DESCRIPTION` - snapper description used for the pacman post snapshot.
+  Default is the pacman command that called the snapshot.
+
+These settings only need to be added to the snapper configuration files if you
+want to change the default.
 
 ## Usage
 

snap-pac

@@ -21,33 +21,46 @@
 # Main script. Is sourced in hooks and functions are called.
 # e.g.: bash -c ". snap-pac; pre"
 
-if [ -f /etc/snap-pac.conf ]; then
-    source /etc/snap-pac.conf
-else
-    echo "WARNING: /etc/snap-pac.conf is missing. Using default settings."
-fi
-
-declare -r cleanupalgo=${CLEANUP_ALGORITHM:-"number"}
-declare -r description=${POST_DESCRIPTION:-"$(echo $(ps -C pacman -o args=) | sed 'sX/usr/bin/pacmanXpacmanXg')"}
-declare -r configurations=${CONFIGS:-"root"}
 declare -r prefile_prefix="/usr/share/libalpm/hooks.bin/snap-pac/.pre"
 
+declare -i i=0
+for x in $(ls /etc/snapper/configs); do
+    source /etc/snapper/configs/$x
+    if [[ $x == "root" ]]; then
+        take_snapshot[i]=${PACMAN_PRE_POST:-"yes"}
+    else
+        take_snapshot[i]=${PACMAN_PRE_POST:-"no"}
+    fi
+    cleanupalgo[i]=${PACMAN_CLEANUP_ALGORITHM:-"number"}
+    pre_description[i]=${PACMAN_PRE_DESCRIPTION:-"$(echo $(ps -C pacman -o args=) | sed 'sX/usr/bin/pacmanXpacmanXg')"}
+    post_description[i]=${PACMAN_POST_DESCRIPTION:-"$(echo $(ps -C pacman -o args=) | sed 'sX/usr/bin/pacmanXpacmanXg')"}
+    i=$(($i+1))
+done
+
 function pre
 {
-    for x in $configurations; do
-        snapper --config $x create --type pre --cleanup-algorithm $cleanupalgo --print-number --description "$description" > $prefile_prefix"_"$x
+    declare -i i=0
+    for x in $(ls /etc/snapper/configs); do
+        if [[ ${take_snapshot[i]} == "yes" ]];then
+            snapper --config $x create --type pre --cleanup-algorithm ${cleanupalgo[i]} --print-number --description "${pre_description[i]}" > $prefile_prefix"_"$x
+        fi
+        i=$(($i+1))
     done
 }
 
 function post 
 {
-    for x in $configurations; do
+    declare -i i=0
+    for x in $(ls /etc/snapper/configs); do
+        if [[ ${take_snapshot[i]} == "yes" ]];then
             if [ -f $prefile_prefix"_"$x ]; then
-            snapper --config $x create --cleanup-algorithm $cleanupalgo --type post --pre-number $(cat $prefile_prefix"_"$x) --description "$description"
+                snapper --config $x create --cleanup-algorithm ${cleanupalgo[i]} --type post --pre-number $(cat $prefile_prefix"_"$x) --description "${post_description[i]}"
                 rm $prefile_prefix"_"$x
             else
-            echo "WARNING: $prefile_prefix"_"$x does not exist, so no post snapshot will be taken. If you are initially installing snap-pac, this is normal."
+                echo "WARNING: $prefile_prefix"_"$x does not exist, so no post snapshot for $x configuration will be taken. If you are initially installing snap-pac, this is normal."
             fi
+        fi
+        i=$(($i+1))
     done
 }
 

snap-pac.conf

@@ -1,15 +0,0 @@
-# snap-pac configuration file
-
-# Snapper configurations of which you want to take pre/post snapshot set.
-# Default is just the root configuration. Uses spaces between each configuration
-# name.
-#CONFIGS="root"
-#CONFIGS="root home"
-
-# The description of the pre/post snapshots. Default is the pacman command that
-# called the hook
-#PRE_DESCRIPTION="$(echo $(ps -C pacman -o args=) | sed 'sX/usr/bin/pacmanXpacmanXg')"
-#POST_DESCRIPTION="$(echo $(ps -C pacman -o args=) | sed 'sX/usr/bin/pacmanXpacmanXg')"
-
-# Snapper cleanup algorithm to use.
-#CLEANUP_ALGORITHM="number"