[#169] Improved support for automated builds.

For environments where there is no TTY device, build_jar.sh can be
passed --non-interactive. This instructs the script to launch a docker
container without the -i and -t options.

Author: korydraughn

README.md

@@ -21,7 +21,7 @@ The following instructions assume you're running Ubuntu 18.04 and Bash.
 ### Building (from source)
 ```bash
 $ cd /path/to/irods_client_nfsrods
-$ bash build_jar.sh
+$ bash build_jar.sh # Consider passing --non-interactive if building in an environment without TTY support.
 $ docker build -t local/nfsrods .
 ```
 

build_jar.sh

@@ -1,11 +1,34 @@
 #! /bin/bash
 
+usage() {
+cat <<_EOF_
+USAGE: bash build_jar.sh [OPTIONS]
+
+Builds a runnable NFSRODS JAR file based on the currently checked out source.
+
+Options:
+  --non-interactive   Launches docker container without -i and -t.
+  -h, --help          Shows this message.
+_EOF_
+    exit
+}
+
+docker_run_iteractive_options="-it"
+
+while [ -n "$1" ]; do
+    case "$1" in
+        --non-interactive)  shift; unset docker_run_iteractive_options;;
+        -h|--help)          usage;;
+    esac
+    shift
+done
+
 # Compiles an executable JAR file from the local repository and
 # stores all build artifacts in local_maven_repo.
 #
 # The local_maven_repo directory keeps your personal maven repository
 # (i.e. $HOME/.m2) clean and safe from the "root" user.
-docker run -it --rm --name nfsrods_builder \
+docker run ${docker_run_iteractive_options} --rm --name nfsrods_builder \
     -v $PWD/local_maven_repo:/root/.m2 \
     -v $PWD:/irods_client_nfsrods \
     -w /irods_client_nfsrods \