waitfor-pod

#!/bin/bash

declare -i timeout=30
declare -i retry=30
declare namespace=
declare pod=
declare -i match_regexp=0

function help() {
    if [[ -n "$1" && $1 != '?' ]] ; then
	echo "Unknown option $*"
    fi
    cat <<EOF
Usage: $0 [options...] pod
  Options:
    -m            Match regexp
    -n namespace  Use this namespace to find the pod
    -r retry      Retry this many times
    -t timeout    Wait this long between retries
EOF
    exit 1
}

while getopts "mn:r:t:" opt ; do
      case "$opt" in
	  m) match_regexp=1      ;;
	  n) namespace="$OPTARG" ;;
	  t) timeout="$OPTARG"   ;;
	  r) retry="$OPTARG"     ;;
	  *) help "$opt"         ;;
      esac
done

shift $((OPTIND - 1))
pod=$1

[[ -z $pod ]] && help

if [[ -n $namespace ]] ; then
    namespace="-n $namespace"
else
    namespace="--all-namespaces"
fi

declare -i try=0

# shellcheck disable=SC2016
declare -r cmd='foreach .items[] as $item ([[],[]];0; if $item.kind == "Pod" then (foreach $item.status.containerStatuses[]? as $status ([[],[]];0;$item.metadata.namespace + " " + $item.metadata.name + " " + $status.name + " " + ($status.state | keys)[0] + (if $status.ready == false then "	" + ([(if $status.state[(($status.state | keys)[0])]|has("reason") then $status.state[(($status.state | keys)[0])]|.reason else "Unhealthy" end)] | join("")) else "" end ))) else null end) | select(. != null)'

function find_pods_named() {
    local pod="$1"
    local run_status=1
    # shellcheck disable=SC2034
    while read -r namespace podname container running status ; do
	# See staging/src/k8s.io/apimachinery/pkg/util/rand/rand.go
	# Shelling out to normalize-podname is remarkably expensive.
	[[ $podname =~ (.*)(-ip(-([0-9]){1,3}){4}\.[-.a-z0-9]+)$ ]] && podname=${BASH_REMATCH[1]}
	[[ $podname =~ (.*)(-([bcdfghjklmnpqrstvwxz2456789]){5})$ ]] && podname=${BASH_REMATCH[1]}
	[[ $podname =~ (.*)(-[bcdfghjklmnpqrstvwxz2456789]{6,}) ]] && podname=${BASH_REMATCH[1]}
	[[ -n $OPENSHIFT_INSTALL_CLUSTER_NAME ]] && podname=${podname%-${OPENSHIFT_INSTALL_CLUSTER_NAME}*}
	[[ ($podname == "$pod" || ($match_regexp == 1 && $podname =~ $pod)) && $run_status -ge 0 ]] && {
	    if [[ $running == "running" ]] ; then
		run_status=0
	    else
		return 2
	    fi
	}
    done
    return $run_status
}

function get_pod() {
    # shellcheck disable=SC2086
    oc get pod $namespace -o json | jq -r "$cmd" | find_pods_named "$pod"
}

echo "Waiting for pod $pod"
while ((try++ < retry)) ; do
    echo -n "Try $try/$retry..."
    # shellcheck disable=SC2086
    get_pod $namespace "$pod" && {
	echo "success!"
	exit 0
    }
    echo "no"
    (( try < retry )) && sleep "$timeout"
done
echo "failed, exiting"
exit 1