#79 add maven shell in docker

test/src/main/docker/mvn-entrypoint.sh

@@ -0,0 +1,50 @@
+#! /bin/sh -eu
+
+# Copy files from /usr/share/maven/ref into ${MAVEN_CONFIG}
+# So the initial ~/.m2 is set with expected content.
+# Don't override, as this is just a reference setup
+
+copy_reference_files() {
+  local log="$MAVEN_CONFIG/copy_reference_file.log"
+  local ref="/usr/share/maven/ref"
+
+  if mkdir -p "${MAVEN_CONFIG}/repository" && touch "${log}" > /dev/null 2>&1 ; then
+      cd "${ref}"
+      local reflink=""
+      if cp --help 2>&1 | grep -q reflink ; then
+          reflink="--reflink=auto"
+      fi
+      if [ -n "$(find "${MAVEN_CONFIG}/repository" -maxdepth 0 -type d -empty 2>/dev/null)" ] ; then
+          # destination is empty...
+          echo "--- Copying all files to ${MAVEN_CONFIG} at $(date)" >> "${log}"
+          cp -rv ${reflink} . "${MAVEN_CONFIG}" >> "${log}"
+      else
+          # destination is non-empty, copy file-by-file
+          echo "--- Copying individual files to ${MAVEN_CONFIG} at $(date)" >> "${log}"
+          find . -type f -exec sh -eu -c '
+              log="${1}"
+              shift
+              reflink="${1}"
+              shift
+              for f in "$@" ; do
+                  if [ ! -e "${MAVEN_CONFIG}/${f}" ] || [ -e "${f}.override" ] ; then
+                      mkdir -p "${MAVEN_CONFIG}/$(dirname "${f}")"
+                      cp -rv ${reflink} "${f}" "${MAVEN_CONFIG}/${f}" >> "${log}"
+                  fi
+              done
+          ' _ "${log}" "${reflink}" {} +
+      fi
+      echo >> "${log}"
+  else
+    echo "Can not write to ${log}. Wrong volume permissions? Carrying on ..."
+  fi
+}
+
+owd="$(pwd)"
+copy_reference_files
+unset MAVEN_CONFIG
+
+cd "${owd}"
+unset owd
+
+exec "$@"