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scitas-motd-update
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Sun, May 11, 07:59

scitas-motd-update
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#!/bin/bash
# Location of the configuration file
SMOTD_CONFIG="../etc/scitas-motd/scitas-motd.conf"
# Read configuration values
if [ -r ${SMOTD_CONFIG} ]
then
. ${SMOTD_CONFIG}
fi
# Check that all the required values are set
REQUIRED_OPTIONS="SMOTD_GITREPO"
MISSING_OPTION=false
for option in ${REQUIRED_OPTIONS}
do
if [ ! -v ${option} ]
then
echo "[ERROR] Missing configuration value: '${option}'" > /dev/stderr
MISSING_OPTION=true
fi
done
if ${MISSING_OPTION}
then
echo "[ERROR] Missing configuration options, update ${SMOTD_CONFIG}" > /dev/stderr
exit 1
fi
# Check if git is available
SMOTD_GIT=${SMOTD_GIT:-git}
${SMOTD_GIT} --version 1&>2 /dev/null
if [ ! $? ]
then
echo "[ERROR] git (${SMOTD_GIT}) not available!" > /dev/stderr
exit 1
fi
#
# Checkout the repository and/or update it
#
SMOTD_GITDIR=${SMOTD_GITDIR:-/var/lib/scitas-motd}
if [ -v ${SMOTD_GITBRANCH} ]
then
GIT_BRANCH_OPT="--branch ${SMOTD_GITBRANCH}"
else
GIT_BRANCH_OPT=""
fi
if [ -d ${SMOTD_GITDIR} && ! -d ${SMOTD_GITDIR}/.git ] || [ ! -a ${SMOTD_GITDIR} ]
then
# Assuming it's either an empty directory, or it does not exist
${SMOTD_GIT} clone ${GIT_BRANCH_OPT} ${SMOTD_GITREPO} ${SMOTD_GITDIR}
RC=$?
if ! ${RC}
then
echo "[ERROR] Error while cloning repository. Maybe ${SMOTD_GITDIR} is not empty?" > /dev/stderr
exit 1
fi
elif [ -d ${SMOTD_GITDIR} && -d ${SMOTD_GITDIR}/.git ]
then
# Assuming it already exists and is a git repo
GIT_OPTIONS="--git-dir=${SMOTD_GITDIR}/.git --work-tree=${SMOTD_GITDIR}"
# For safety let's reset the origin URL
# TODO: check return codes
${SMOTD_GIT} ${GIT_OPTIONS} remote origin set-url ${SMOTD_GITREPO}
${SMOTD_GIT} ${GIT_OPTIONS} fetch origin
# TODO: test corner cases (different states of the repo)
GIT_REF=${SMOTD_GIT} ${GIT_OPTIONS} show-ref --hash refs/remotes/origin/${SMOTD_GITBRANCH:-HEAD}
${SMOTD_GIT} ${GIT_OPTIONS} reset --quiet --hard ${GIT_REF}
else
# It must already exist and not be a directory
echo "[ERROR] ${SMOTD_GITDIR} exists and is not a directory!" > /dev/sdterr
exit 1
fi
exit 0

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