add option to link kernel modules

hooks/00_snapper-pre.hook

@@ -28,4 +28,5 @@ Description = Performing snapper pre snapshots for the following configurations.
 Depends = snap-pac
 When = PreTransaction
 Exec = /usr/share/libalpm/scripts/snap-pac pre
+NeedsTargets
 AbortOnFail

hooks/zy_snapper-post.hook

@@ -28,3 +28,4 @@ Description = Performing snapper post snapshots for the following configurations
 Depends = snap-pac
 When = PostTransaction
 Exec = /usr/share/libalpm/scripts/snap-pac post
+NeedsTargets

man8/snap-pac.8

@@ -54,7 +54,22 @@ Number of characters to limit length of descriptions used for snapper.
 Default is "48".
 .RE
 
+<<<<<<< HEAD
 The following are settings used on each specific snapper
+=======
+\fBLINK_MODULES=\fR\fB\fIyes\fR\fR\fB or \fR\fB\fIno\fR\fR
+.RS 4
+When set to "yes" this, if the \fIlinux\fR package is updated, then a
+symlink will be created in the kernel modules directory for the
+currently running kernel to same directory in the pre snapshot. This
+is so that the kernel modules will still be available for use before a
+reboot is required. 
+
+Default is "no".
+.RE
+
+The following are possible settings used on each specific snapper
+>>>>>>> modules
 configuration you have. To use them, first create the folder
 \fI/etc/snap-pac\fR if it does not already exist. Then create a file
 for the snapper configuration file you want these settings to apply

scripts/snap-pac

@@ -73,6 +73,18 @@ truncate_description() {
     fi
 }
 
+package_updated() {
+    check="$1"
+    for x in ${packages[@]}; do
+        echo $x
+        if [[ "$x" == "$check" ]]; then
+            echo "yes"
+            return
+        fi
+    done
+    echo "no"
+}
+
 trap 'traperror ${LINENO} $? "$BASH_COMMAND" $BASH_LINENO "${FUNCNAME[@]}"' ERR
 trap trapkill SIGTERM SIGINT
 
@@ -84,6 +96,11 @@ read_config "$SNAPPAC_CONFIG_FILE"
 
 readonly DESC_LIMIT=${DESC_LIMIT:-48}
 readonly ABORT_ON_FAIL=${ABORT_ON_FAIL:-"no"}
+readonly LINK_MODULES=${LINK_MODULES:-"no"}
+readonly KERNEL_PACKAGE=${KERNEL_PACKAGE=-"linux"}
+
+mapfile -t packages
+kernel_updated=$(package_updated "$KERNEL_PACKAGE")
 
 for CONFIG in $SNAPPER_CONFIGS; do
 
@@ -112,6 +129,11 @@ for CONFIG in $SNAPPER_CONFIGS; do
         x=$($snapper_cmd "$(truncate_description $PRE_DESCRIPTION)")
         printf "==> %s: $(echo $x | tee "$prefile")\n" "$CONFIG"
     elif [[ -f $prefile && "$pre_or_post" == "post" ]]; then
+        if [[ "$LINK_MODULES" == "yes" && "$kernel_updated" == "yes" && "$CONFIG" == "root" ]]; then
+            printf "==> Symlinking old kernel modules...\n"
+            find /usr/lib/modules -xtype l -delete -print
+            ln -sv /.snapshots/$(<$prefile)/snapshot/usr/lib/modules/$(uname -r) /usr/lib/modules/
+        fi
         x=$($snapper_cmd "$(truncate_description $POST_DESCRIPTION)" --pre-number "$(< "$prefile")")
         printf "==> %s: %s\n" "$CONFIG" "$x"
         rm -f "$prefile"