jenkins.sh

#! /bin/bash

set -e

# Copy files from /usr/share/jenkins/ref into /var/jenkins_home
# So the initial JENKINS-HOME is set with expected content. 
# Don't override, as this is just a reference setup, and use from UI 
# can then change this, upgrade plugins, etc.
copy_reference_file() {
	f="${1%/}"
	echo "$f" >> "$COPY_REFERENCE_FILE_LOG"
    rel="${f:23}"
    dir="$(dirname ${f})"
    echo " $f -> $rel" >> "$COPY_REFERENCE_FILE_LOG"
	if [[ ! -e /var/jenkins_home/${rel} ]] 
	then
		echo "copy $rel to JENKINS_HOME" >> "$COPY_REFERENCE_FILE_LOG"
		mkdir -p "/var/jenkins_home/${dir:23}"
		cp -r "/usr/share/jenkins/ref/${rel}" "/var/jenkins_home/${rel}";
		# pin plugins on initial copy
		[[ ${rel} == plugins/*.jpi ]] && touch "/var/jenkins_home/${rel}.pinned"
	fi; 
}
export -f copy_reference_file
touch "${COPY_REFERENCE_FILE_LOG}" || echo "Can not write to ${COPY_REFERENCE_FILE_LOG}. Wrong volume permissions?"
echo "--- Copying files at $(date)" >> "$COPY_REFERENCE_FILE_LOG"
find /usr/share/jenkins/ref/ -type f -exec bash -c "copy_reference_file '{}'" \;

# if `docker run` first argument start with `--` the user is passing jenkins launcher arguments
if [[ $# -lt 1 ]] || [[ "$1" == "--"* ]]; then
   exec java $JAVA_OPTS -jar /usr/share/jenkins/jenkins.war $JENKINS_OPTS "$@"
fi

# As argument is not jenkins, assume user want to run his own process, for sample a `bash` shell to explore this image
exec "$@"