Merge pull request #8 from OranJuiceJohnes/master

New Pull Request

README.md

@@ -6,8 +6,21 @@ nsbackup is a bash script that uses curl and the inwx API to update nameserver e
 
 Place your config files in the _nsupdate.d_ folder.
 
+## Requirements
+
+In order to run you need to have _curl_ and _awk_ installed, as well as _drill_ or _nslookup_.
+
+At least one config file needs to exist ending with _.config_. A "sample.config.dist" is provided.
+
 ## Changelog
 
+**2015-01-12**
+
+- Added checking for needed commands
+- Added checking for existing config file
+- Added requirements to README.md
+
+
 **2014-02-21**
 
 - Added support for IPv6

nsupdate.d/sample.config.dist

@@ -1,7 +1,7 @@
 # nsupdate.config
 
 # from which site should we get your wan ip?
-IP_CHECK_SITE="http://ip.dblx.io"
+IP_CHECK_SITE="https://ip.dblx.io"
 
 # use drill instead of nslookup for hostname lookup
 USE_DRILL="YES"

nsupdate.sh

@@ -24,6 +24,20 @@
 # OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
+##################
+# check required #
+##################
+command -v curl >/dev/null 2>&1 || { echo >&2 "I require curl but it's not installed. Note: all needed items are listed in the README.md file."; exit 1; }
+command -v awk >/dev/null 2>&1 || { echo >&2 "I require awk but it's not installed. Note: all needed items are listed in the README.md file."; exit 1; }
+command -v drill >/dev/null 2>&1 || command -v nslookup >/dev/null 2>&1 || { echo >&2 "I need drill or nslookup installed. Note: all needed items are listed in the README.md file."; exit 1; }
+##################
+# check config   #
+##################
+if [ ! -f nsupdate.d/*.config ]; then
+    echo "There does not seem to be ready to be used config file available." ; exit 1;
+fi
+##################
+
 LOG=$0.log
 
 # Loop through configs