mackerel のホスト一覧をファイルに書いて、ssh 補完できるようにする (required jq)

bash_complesin.config.ssh.bash

# ~/.ssh/config
_known_hosts_real()
{
    export NSS_SDB_USE_CACHE=yes
    local config_file=~/.ssh/config
    local ctime=0
    [ -f $config_file ] && ctime=$(stat -c %Y $config_file)
    local t=$(($(date +%s) - $ctime))
    local interval=60
    local search_word="# mackerel"
    if [ $t -ge $interval ]; then
        local apikey=$(cat /etc/mackerel-agent/mackerel-agent.conf | grep ^apikey | awk '{ $key = substr($3, 2); sub(/.$/,"",$key); print $key }')
        local hosts=$(curl -s https://mackerel.io/api/v0/hosts.json -H "X-Api-Key: ${apikey}" | jq -r '.hosts[] | select(.status != "poweroff") | "\(.name) \(.meta.cloud.metadata["local-ipv4"])"' | xargs -I{} echo {} "${search_word}")
        if [ $? -eq 0 ]; then
            [ -f $config_file ] && sed -i "/${search_word}/,+2d" $config_file
            echo "${hosts}" | awk -v comment="${search_word}" '{printf("Host %s %s\nHostname %s\n", $1, comment, $2)}' >> $config_file
        fi
    fi

    local comp_hosts=$(grep "${search_word}" $config_file |  awk '{printf("%s ", $2)}')
    COMPREPLY=( $( \
       compgen -W "${comp_hosts}" \
               ${COMP_WORDS[COMP_CWORD]} \
    ) )
    return 0
}

bash_complesin.hosts.ssh.bash

# /etc/hosts
_known_hosts_real()
{
    export NSS_SDB_USE_CACHE=yes
    local config_file=/etc/hosts
    local ctime=0
    [ -f $config_file ] && ctime=$(stat -c %Y $config_file)
    local t=$(($(date +%s) - $ctime))
    local interval=60
    local search_word="# mackerel"
    if [ $t -ge $interval ]; then
        local apikey=$(cat /etc/mackerel-agent/mackerel-agent.conf | grep ^apikey | awk '{ $key = substr($3, 2); sub(/.$/,"",$key); print $key }')
        local hosts=$(curl -s https://mackerel.io/api/v0/hosts.json -H "X-Api-Key: ${apikey}" | jq -r '.hosts[] | select(.status != "poweroff") | "\(.meta.cloud.metadata["local-ipv4"]) \(.name)"' | xargs -I{} echo {} "${search_word}")
        if [ $? -eq 0 ]; then
            [ -f $config_file ] && sed -i '/# mackerel/d' $config_file
            echo "${hosts}" >> $config_file
        fi
    fi

    local comp_hosts=$(grep "${search_word}" $config_file |  awk '{printf("%s ", $2)}')
    COMPREPLY=( $( \
       compgen -W "${comp_hosts}" \
               ${COMP_WORDS[COMP_CWORD]} \
    ) )
    return 0
}

hosts.cron

#!/bin/bash

set -e
export NSS_SDB_USE_CACHE=yes
config_file=/etc/hosts
search_word="# mackerel"
apikey=$(cat /etc/mackerel-agent/mackerel-agent.conf | grep ^apikey | awk '{ $key = substr($3, 2); sub(/.$/,"",$key); print $key }')
hosts=$(curl -s https://mackerel.io/api/v0/hosts.json -H "X-Api-Key: ${apikey}" | jq -r '.hosts[] | select(.status != "poweroff") | "\(.meta.cloud.metadata["local-ipv4"]) \(.name)"' | xargs -I{} echo {} "${search_word}")
[ -f $config_file ] && sed -i '/# mackerel/d' $config_file
echo "${hosts}" >> $config_file