Pasttle

#!/bin/bash

VALID_CHANNELS="stable candidate fast"

from="$1"
if [ -z "$from" ]; then
  echo "Provide an openshift version to check upgrade path"
  exit 1
fi

shift

to="$1"

if [ -z "$to" ]; then
  to="$( echo "$from" | cut -d. -f1-2 | paste -sd. )"
fi

shift

channel="${1:-stable}"

if ! echo "$VALID_CHANNELS" | grep -q -w "$channel"; then
  echo "Channel must be one of: $VALID_CHANNELS"
  exit 1
fi

url="https://api.openshift.com/api/upgrades_info/v1/graph?channel=${channel}-${to}&arch=amd64"

echo "Checking upgrade path from ${from} to ${to} at ${url}"

curl \
  --silent \
  --header 'Accept:application/json' \
  "$url" \
  | jq -r ". as \$graph
    | \$graph.nodes
    | map(.version == \"${from}\")
    | index(true) as \$orig
    | \$graph.edges
    | map(select(.[0] == \$orig)[1])
    | map(\$graph.nodes[.])[].version" \
  | sort --version-sort