Add semver support when using git tags (#69)

* Add semver tag support

* Allow tag_names to be a fallback for tag_semver

README.md

@@ -187,3 +187,16 @@ with:
   password: ${{ secrets.DOCKER_PASSWORD }}
   tag_names: true
 ```
+
+### tag_semver
+Use `tag_semver` when you want to push tags using the semver syntax by their git name (e.g. `refs/tags/v1.2.3`). This will push four
+docker tags: `1.2.3`, `1.2` and `1`. A prefix 'v' will automatically be removed.
+> CAUTION: Images produced by this feature can be override by branches with the same name - without a way to restore.
+
+```yaml
+with:
+  name: myDocker/repository
+  username: ${{ secrets.DOCKER_USERNAME }}
+  password: ${{ secrets.DOCKER_PASSWORD }}
+  tag_semver: true
+```

action.yml

@@ -35,6 +35,9 @@ inputs:
   tag_names:
     description: 'Use tag_names when you want to push tags/release by their git name'
     required: false
+  tag_semver:
+    description: 'Push semver docker tags. e.g. image:1.2.3, image:1.2, image:1'
+    required: false
 outputs:
   tag:
     description: 'Is the tag, which was pushed'

entrypoint.sh

@@ -73,6 +73,8 @@ function translateDockerTag() {
     INPUT_NAME=$(echo ${INPUT_NAME} | cut -d':' -f1)
   elif isOnMaster; then
     TAGS="latest"
+  elif isGitTag && usesBoolean "${INPUT_TAG_SEMVER}" && isSemver "${GITHUB_REF}"; then
+    TAGS=$(echo ${GITHUB_REF} | sed -e "s/refs\/tags\///g" | sed -E "s/v?([0-9]+)\.([0-9+])\.([0-9]+)/\1.\2.\3 \1.\2 \1/g")
   elif isGitTag && usesBoolean "${INPUT_TAG_NAMES}"; then
     TAGS=$(echo ${GITHUB_REF} | sed -e "s/refs\/tags\///g")
   elif isGitTag; then
@@ -129,6 +131,10 @@ function usesBoolean() {
   [ ! -z "${1}" ] && [ "${1}" = "true" ]
 }
 
+function isSemver() {
+  echo "${1}" | grep -Eq '^refs/tags/v?([0-9]+)\.([0-9+])\.([0-9]+)$'
+}
+
 function useSnapshot() {
   local TIMESTAMP=`date +%Y%m%d%H%M%S`
   local SHORT_SHA=$(echo "${GITHUB_SHA}" | cut -c1-6)

test.bats

@@ -98,6 +98,64 @@ teardown() {
 /usr/local/bin/docker push my/repository:latest"
 }
 
+@test "with tag semver it pushes tags using the major and minor versions" {
+  export GITHUB_REF='refs/tags/v1.2.34'
+  export INPUT_TAG_SEMVER="true"
+
+  run /entrypoint.sh
+
+  expectStdOutContains "::set-output name=tag::1.2.34"
+
+  expectMockCalled "/usr/local/bin/docker login -u USERNAME --password-stdin
+/usr/local/bin/docker build -t my/repository:1.2.34 -t my/repository:1.2 -t my/repository:1 .
+/usr/local/bin/docker push my/repository:1.2.34
+/usr/local/bin/docker push my/repository:1.2
+/usr/local/bin/docker push my/repository:1
+/usr/local/bin/docker inspect --format={{index .RepoDigests 0}} my/repository:1.2.34
+/usr/local/bin/docker logout"
+}
+
+@test "with tag semver it pushes tags without 'v' prefix" {
+  export GITHUB_REF='refs/tags/1.2.34'
+  export INPUT_TAG_SEMVER="true"
+
+  run /entrypoint.sh
+
+  expectStdOutContains "::set-output name=tag::1.2.34"
+
+  expectMockCalled "/usr/local/bin/docker login -u USERNAME --password-stdin
+/usr/local/bin/docker build -t my/repository:1.2.34 -t my/repository:1.2 -t my/repository:1 .
+/usr/local/bin/docker push my/repository:1.2.34
+/usr/local/bin/docker push my/repository:1.2
+/usr/local/bin/docker push my/repository:1
+/usr/local/bin/docker inspect --format={{index .RepoDigests 0}} my/repository:1.2.34
+/usr/local/bin/docker logout"
+}
+
+@test "with tag semver it pushes latest when tag has invalid semver version" {
+  export GITHUB_REF='refs/tags/vAA.BB.CC'
+  export INPUT_TAG_SEMVER="true"
+
+  run /entrypoint.sh
+
+  expectStdOutContains "::set-output name=tag::latest"
+
+  expectMockCalled "/usr/local/bin/docker build -t my/repository:latest .
+/usr/local/bin/docker push my/repository:latest"
+}
+
+@test "with tag semver set to false it doesn't push tags using semver" {
+  export GITHUB_REF='refs/tags/v1.2.34'
+  export INPUT_TAG_NAMES="false"
+
+  run /entrypoint.sh
+
+  expectStdOutContains "::set-output name=tag::latest"
+
+  expectMockCalled "/usr/local/bin/docker build -t my/repository:latest .
+/usr/local/bin/docker push my/repository:latest"
+}
+
 @test "it pushes specific Dockerfile to latest" {
   export INPUT_DOCKERFILE='MyDockerFileName'