added exclude packages script

.setup/config/exclude_from_update.sh

@@ -0,0 +1,40 @@
+# read list of packages to exclude from update
+exclude_list_file=~/.setup/packages/exclude_from_updating.list
+exclude_list=$(cat $exclude_list_file)
+
+pacman_config_file=/etc/pacman.conf
+
+# get current IngorePkg line from pacman.conf
+# line may have # at the beginning
+old_ignore_line=$(grep -P "^#?IgnorePkg" $pacman_config_file)
+echo old_ignore_line: $old_ignore_line
+
+# split line at = and take second part
+old_packages_line=$(echo $old_ignore_line | cut -d= -f2)
+echo old_packages_line: $old_packages_line
+
+# extract list of packages from line, separated by spaces
+old_ignore_packages=$(echo $old_packages_line| tr -s ' ' '\n')
+echo old_packages: $old_packages
+
+# add packages to ignore line, if not already there
+new_ignore_packages=$old_ignore_packages
+for package in $exclude_list; do
+    if [[ ! $old_ignore_packages =~ $package ]]; then
+	new_ignore_packages="$new_ignore_packages $package"
+    fi
+done
+
+# join packages with spaces
+new_ignore_packages_line=$(echo $new_ignore_packages | tr '\n' ' ')
+echo new_ignore_packages_line: $new_ignore_packages_line
+
+# add IgnorePkg= to beginning of line
+new_ignore_line="IgnorePkg	= $new_ignore_packages_line"
+echo new_ignore_line: $new_ignore_line
+
+# replace old IgnorePkg line with new one
+echo "updating pacman.conf"
+sudo sed -i "s/$old_ignore_line/$new_ignore_line/" $pacman_config_file
+
+echo "done"