71 lines
2.0 KiB
Bash
71 lines
2.0 KiB
Bash
#! /usr/bin/env sh
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set -e
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cleanup() {
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if [ "${CLEAN_EXIT}" = false ]; then
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echo "something went wrong"
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echo "continue with the pipeline"
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exit 0
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fi
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}
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trap cleanup EXIT
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CLEAN_EXIT=false
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if [ -z "${BASE}" ]; then
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echo "the environment variable BASE is not set"
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exit 1
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fi
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if [ -z "${TARGET}" ]; then
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echo "the environment variable TARGET is not set"
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exit 1
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fi
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# add "library/" if its a "official" docker image (it has no username)
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echo "${BASE}" | grep -q "/" || BASE="library/${BASE}"
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echo "${TARGET}" | grep -q "/" || TARGET="library/${TARGET}"
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# if no tag is give default to latest
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echo "${BASE}" | grep -q ":" || BASE="${BASE}:latest"
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echo "${TARGET}" | grep -q ":" || TARGET="${TARGET}:latest"
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# move the tag to its own var and remove it from the repo name
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BASE_TAG=$(echo "${BASE}" | sed 's/[^:]*://')
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TARGET_TAG=$(echo "${TARGET}" | sed 's/[^:]*://')
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BASE_REPO=$(echo "${BASE}" | sed 's/:.*//')
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TARGET_REPO=$(echo "${TARGET}" | sed 's/:.*//')
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# build the url to the repo
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BASE_URL="https://hub.docker.com/v2/repositories/${BASE_REPO}/tags/${BASE_TAG}"
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TARGET_URL="https://hub.docker.com/v2/repositories/${TARGET_REPO}/tags/${TARGET_TAG}"
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# login if credentias are passed
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HEADER=""
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if [ -n "${DOCKER_USERNAME}" ] && [ -n "${DOCKER_PASSWORD}" ]; then
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TOKEN=$(curl -s -H "Content-Type: application/json" -X POST -d '{"username": "'"${DOCKER_USERNAME}"'", "password": "'"${DOCKER_PASSWORD}"'"}' https://hub.docker.com/v2/users/login/ | jq -r .token)
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HEADER="Authorization: JWT ${TOKEN}"
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fi
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# compare the update time of the BASE and TARGET images
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BASE_DATE=$(curl -s -H "${HEADER}" "${BASE_URL}" | jq -r .last_updated | sed 's/T/ /' | sed 's/\..*//' )
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TARGET_DATE=$(curl -s -H "${HEADER}" "${TARGET_URL}" | jq -r .last_updated | sed 's/T/ /' | sed 's/\..*//' )
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BASE_TIMESTAMP=$(date -d "${BASE_DATE}" +%s)
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TARGET_TIMESTAMP=$(date -d "${TARGET_DATE}" +%s)
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CLEAN_EXIT=true
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if [ "$BASE_TIMESTAMP" -le "$TARGET_TIMESTAMP" ]; then
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echo "no update needed"
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exit 1
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fi
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echo "$TARGET needs updating"
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exit 0 |