name: "#️⃣ Get image tag (action)"

description: This action gets the image tag from the commit ref or input (if provided)

outputs:

tag:

description: The image tag

value: ${{ steps.get_tag.outputs.tag }}

is_semver:

description: Whether the tag is a semantic version

value: ${{ steps.check_semver.outputs.is_semver }}

inputs:

tag:

description: The image tag. If this is set it will return the tag as is.

required: false

default: ""

runs:

using: "composite"

steps:

- name: "#️⃣ Get image tag (step)"

id: get_tag

shell: bash

run: |

if [[ -n "${{ inputs.tag }}" ]]; then

tag="${{ inputs.tag }}"

elif [[ "${{ github.ref_type }}" == "tag" ]]; then

if [[ "${{ github.ref_name }}" == infra-*-* ]]; then

env=$(echo ${{ github.ref_name }} | cut -d- -f2)

sha=$(echo ${{ github.sha }} | head -c7)

ts=$(date +%s)

tag=${env}-${sha}-${ts}

elif [[ "${{ github.ref_name }}" == re2-*-* ]]; then

env=$(echo ${{ github.ref_name }} | cut -d- -f2)

sha=$(echo ${{ github.sha }} | head -c7)

ts=$(date +%s)

tag=${env}-${sha}-${ts}

elif [[ "${{ github.ref_name }}" == v.docker.* ]]; then

version="${GITHUB_REF_NAME#v.docker.}"

tag="v${version}"

elif [[ "${{ github.ref_name }}" == build-* ]]; then

tag="${GITHUB_REF_NAME#build-}"

else

echo "Invalid git tag: ${{ github.ref_name }}"

exit 1

fi

elif [[ "${{ github.ref_name }}" == "main" ]]; then

tag="main"

else

echo "Invalid git ref: ${{ github.ref }}"

exit 1

fi

echo "tag=${tag}" >> "$GITHUB_OUTPUT"

- name: 🔍 Check for validity

id: check_validity

shell: bash

env:

tag: ${{ steps.get_tag.outputs.tag }}

run: |

if [[ "${tag}" =~ ^[a-z0-9]+([._-][a-z0-9]+)*$ ]]; then

echo "Tag is valid: ${tag}"

else

echo "Tag is not valid: ${tag}"

exit 1

fi

- name: 🆚 Check for semver

id: check_semver

shell: bash

env:

tag: ${{ steps.get_tag.outputs.tag }}

# Will match most semver formats except build metadata, i.e. v1.2.3+build.1

# Valid matches:

# v1.2.3

# v1.2.3-alpha

# v1.2.3-alpha.1

# v1.2.3-rc.1

# v1.2.3-beta-1

run: |

if [[ "${tag}" =~ ^v[0-9]+\.[0-9]+\.[0-9]+(-[0-9A-Za-z-]+(\.[0-9A-Za-z-]+)*)?$ ]]; then

echo "Tag is a semantic version: ${tag}"

is_semver=true

else

echo "Tag is not a semantic version: ${tag}"

is_semver=false

fi

echo "is_semver=${is_semver}" >> "$GITHUB_OUTPUT"