Script to launch a migration of an XROOTD namespace conforming to the ALICE VO conventions

alice-migration.sh

NAMESPACE=${NAMESPACE:-"/export/xrootd/"}
RSYNC_ADDR=${RSYNC_ADDR:-"rsync://f01-120-179/alice-xrootd/"}
NS_START=${NS_START:-"00"}
NS_STOP=${NS_STOP:-"15"}
#!/bin/bash
if [[ "$*" =~ " -h" ]] || [[ "$*" =~ ^-h ]] || [[ "$*" =~ "--help" ]]
then
    echo "usage:" >&2
    echo " <script> [NAMESPACE [RSYNC_ADDR [NS_START NS_STOP]]]" >&2
    echo "" >&2
    echo "Migrate an ALICE namespace rooted at NAMESPACE to an rsync daemon at RSYNC_ADDR" >&2
    echo "If NS_START and NS_STOP are defined, move the respective subdirectories only"
    echo "" >&2
    echo "This launches a sequence of rsync processes to transfer" >&2
    echo "the namespace to the remote daemon. Note that the target" >&2
    echo "environment must have been set up properly for writing." >&2
    echo "" >&2
    echo "The rsync processes are launched in a screen session." >&2
    echo "" >&2
    echo "Defaults:" >&2
    echo "  NAMESPACE   ${NAMESPACE}" >&2
    echo "  RSYNC_ADDR  ${RSYNC_ADDR}" >&2
    echo "  NS_START    ${NS_START}" >&2
    echo "  NS_STOP     ${NS_STOP}" >&2
    exit
fi

SCREEN_NAME='alice-migration'
if screen -S "${SCREEN_NAME}" -X select . 2>/dev/null 1>&2
then
    echo "Screen '${SCREEN_NAME}' already exists" >&2
    exit 1
fi

NAMESPACE=${1:-${NAMESPACE}}
RSYNC_ADDR=${2:-${RSYNC_ADDR}}
NS_START=${3:-${NS_START}}
NS_STOP=${4:-${NS_STOP}}
# make sure this is an ALICE namespace
for SEGMENT in $(seq -f '%02.0f' 0 15)
do
    if [[ ! -d "${NAMESPACE}/${SEGMENT}" ]]
    then
        echo '$1 must point to the namespace root, but there' >&2
        echo "is no segment ${SEGMENT} in \$1=${NAMESPACE}" >&2
        exit
    fi
done

echo "Migrating namespace ${NAMESPACE} to ${RSYNC_ADDR}" >&2

# create screen session, set all windows to remain
screen -dmS "${SCREEN_NAME}" bash -c "echo 'Migrating from ${NAMESPACE} to ${RSYNC_ADDR}'; sleep 30"
screen -XS "${SCREEN_NAME}" zombie kr
# start a separate transfer for each segment of the SE
for SEGMENT in $(seq -f '%02.0f' ${NS_START} ${NS_STOP})
do
    LOG_FILE="${NAMESPACE}/${SCREEN_NAME}-${SEGMENT}.log"
    screen -XS "${SCREEN_NAME}" screen -t "rsync ${SEGMENT}" bash -c "until rsync --recursive --copy-links --times --omit-dir-times --whole-file --relative --itemize-changes --log-file='${LOG_FILE}' '${NAMESPACE}/./${SEGMENT}' '${RSYNC_ADDR}';do echo 'rsync quit unexpectedly, retrying in 10 seconds...' >&2; sleep 10; done"
    echo "Migrating ${SEGMENT} log-file=${LOG_FILE}"
done
echo "Launched migration of all segments" >&2
echo "Run" >&2
echo "  screen -rdS '${SCREEN_NAME}'" >&2
echo "to monitor progress" >&2