Script to automate render_list from mod_tile/renderd. It will generate tiles for all or some renderd styles, rendering one zoom level at a time.

prerender.sh

#!/bin/bash
set -e

RENDER_BIN="/usr/local/bin/render_list"

# Default Options
ALL_STYLES=1
CATCH_SIGPIPE=1
CONFIG="/etc/renderd.conf"
RENDER_OPTS=()
SOCKET="/var/run/renderd/renderd.sock"
STYLES=""
TILE_DIR="/work/tiles"
VERBOSE=0

# print local output in a different colour to differentiate
# output from render_list's output
function cecho {
        echo -e "\e[32m$1\e[39m"
}

# Parse the options. Supports cases where user sets an option
# multiple times on the command line: only last invocation is
# used.
for opt in "$@"
do
case $opt in
        --all-styles)
        ALL_STYLES=1
        shift
        ;;
        --catch-sigpipe)
        CATCH_SIGPIPE=1
        shift
        ;;
        -c=*|--config=*)
        CONFIG="${opt#*=}"
        shift
        ;;
        -Z=*|--max-zoom=*)
        MAXZOOM="${opt#*=}"
        shift
        ;;
        -z=*|--min-zoom=*)
        MINZOOM="${opt#*=}"
        shift
        ;;
        --no-catch-sigpipe)
        CATCH_SIGPIPE=0
        shift
        ;;
        -s=*|--socket=*)
        SOCKET="${opt#*=}"
        shift
        ;;
        --styles=*)
        ALL_STYLES=0
        STYLES="${opt#*=}"
        shift
        ;;
        -t=*|--tile-dir=*)
        TILE_DIR="${opt#*=}"
        shift
        ;;
        -v|--verbose)
        VERBOSE=1
        shift
        ;;
        *)
        # All unknown options will be passed to render_list
        RENDER_OPTS+=($opt)
        ;;
esac
done

# Do some basic checks before even invoking render_list
if [[ ! $MINZOOM =~ ^([0-9]|[1-9][0-9])$ ]]; then
        cecho "MINZOOM must be greater than or equal to 0"
        exit 1
fi

if [[ ! $MAXZOOM =~ ^([0-9]|[1-9][0-9])$ ]]; then
        cecho "MAXZOOM must be greater than or equal to 0"
        exit 1
fi

if [[ $MINZOOM -gt $MAXZOOM ]]; then
        cecho "MINZOOM ($MINZOOM) cannot be greater than MAXZOOM ($MAXZOOM)"
        exit 1
fi

# Get all styles from config file
if [[ $ALL_STYLES -eq 1 ]]; then
        directives=$(awk 'match($0, /\[(.+)\]/) { print substr($0, RSTART + 1, RLENGTH - 2) }' $CONFIG)
        for directive in $directives; do
        if [[ ! ($directive == "renderd" || $directive == "mapnik") ]]; then
                cecho "found style '$directive'"
                STYLES+="$directive,"
        fi
        done

        if [ "${STYLES: -1}" == "," ]; then
                STYLES="${STYLES:0:-1}"
        fi
else
        if [[ $STYLES == "" ]]; then
                cecho "No styles have been specified. Specify a comma-separated list of styles, or"
                cecho "specify all styles with --all-styles."
                exit 1
        fi
fi

# Split styles to iterable string
STYLES=$(echo $STYLES | sed 's/,/ /g')

# Re-add options for render_list
RENDER_OPTS+=("--tile-dir=$TILE_DIR --socket=$SOCKET")

if [[ $VERBOSE -eq 1 ]]; then
        RENDER_OPTS+=("-v")
        cecho "Verbose output? ${VERBOSE}"
        cecho "Render all styles? ${ALL_STYLES}"
        cecho "Styles to render: ${STYLES}"
        cecho "Config file: ${CONFIG}"
        cecho "Catch SIGPIPE errors? ${CATCH_SIGPIPE}"
        cecho "Tile directory: ${TILE_DIR}"
        cecho "Min zoom: ${MINZOOM}"
        cecho "Max zoom: ${MAXZOOM}"
        cecho "Opts for render_list: ${RENDER_OPTS[@]}"
fi

function render {
        if [[ $VERBOSE -eq 1 ]]; then
                cecho "Running: $RENDER_BIN --all --map=$1 --min-zoom=$2 --max-zoom=$2 ${RENDER_OPTS[@]}"
        fi

        "$RENDER_BIN" --all --map=$1 --min-zoom=$2 --max-zoom=$2 ${RENDER_OPTS[@]}
        trap "{ if [[ $CATCH_SIGPIPE -eq 1 ]]; then render $1 $2; fi; }" SIGPIPE
}

for z in $(seq $MINZOOM $MAXZOOM); do
        if [[ $VERBOSE -eq 1 ]]; then
                cecho "=========="
                cecho "ZOOM LEVEL $z"
                cecho "=========="
        fi

        for style in $STYLES; do
                render $style $z
        done
done