fix

.semaphore/semaphore.yml

@@ -5,6 +5,22 @@ agent:
     type: e1-standard-2
     os_image: ubuntu2004
 blocks:
+  - name: Linting
+    task:
+      jobs:
+          - name: Golangci-lint
+            commands:
+              - golangci-lint run -c ./golangci.yaml
+      prologue:
+        commands:
+          - sem-version go 1.17
+          - checkout
+          - 'cache restore vendor-$SEMAPHORE_GIT_BRANCH-$(checksum go.mod),vendor-$SEMAPHORE_GIT_BRANCH,vendor-master'
+          - 'curl -sSfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s -- -b $(go env GOPATH)/bin v1.17.3'
+      epilogue:
+        always:
+          commands:
+            - cache save
   - name: Build
     task:
       jobs:

README.md

@@ -1,10 +1,37 @@
-# Gitlab container registry cleaner
+[![License](https://img.shields.io/badge/license-MIT-blue.svg)](https://github.com/traefik/traefik/blob/master/LICENSE.md)
 
-## About deploy
+Gitlab container registry cleaner
+---
 
-https://semaphoreci.com/community/tutorials/how-to-deploy-a-go-web-application-with-docker
+## Features
+Periodic removes old images from GitLab container registry in all projects.
 
-## Run linter
+## Environment variables
+- PRODUCTION=false ( configure log format )
+- THRESHOLD=3 ( images over threshold will be deleted automatically )
+- BASE_API_URL=https://gitlab.com/api/v4 ( gitlab api endpoint )
+- ACCESS_TOKEN=XXX ( gitlab access token, see https://docs.gitlab.com/ee/user/profile/personal_access_tokens.html#create-a-personal-access-token )
+- CRON_TIME=01:11 ( time of day to run clean )
+
+## Configuration file
+```
+cp ./.env.example ./.env
+```
+
+## Run clean command in docker
+```
+docker run \
+--name gitlab-registry-cleaner \
+--env-file=./.env \
+--env COMMAND_NAME=clean \
+ataklychev/gitlab-registry-cleaner
+```
+
+## Run cron command in docker
 ```
-make lint
+docker run \
+--name gitlab-registry-cleaner \
+--env-file=./.env \
+--env COMMAND_NAME=cron \
+ataklychev/gitlab-registry-cleaner
 ```

service/garbage_collection_service.go

@@ -17,6 +17,10 @@ func NewGarbageCollectionService(
 	gitlabRepo repository.GitlabRepositoryInterface,
 	logger logger.Logger,
 ) GarbageCollectionServiceInterface {
+	// minimal number of saved images
+	if threshold < 1 {
+		threshold = 1
+	}
 	return &GarbageCollectionService{
 		threshold:  threshold,
 		gitlabRepo: gitlabRepo,