{"id":919,"date":"2021-09-15T16:30:14","date_gmt":"2021-09-15T03:30:14","guid":{"rendered":"https:\/\/blog.wiseowls.co.nz\/?p=919"},"modified":"2021-09-15T16:36:24","modified_gmt":"2021-09-15T03:36:24","slug":"tagging-containers-in-azure-devops","status":"publish","type":"post","link":"https:\/\/blog.wiseowls.co.nz\/index.php\/2021\/09\/15\/tagging-containers-in-azure-devops\/","title":{"rendered":"Things they don’t tell you – Tagging containers in Azure DevOps"},"content":{"rendered":"\n

Here’s an interesting gotcha that has kept us occupied for a little while. Our client wanted us to build an Azure DevOps pipeline that would build a container, tag it, and launch the image to do more work. As the result was not really worth pushing up to image registries, we decided to go fully local.<\/p>\n\n\n\n

Setting up agent pool<\/h2>\n\n\n\n

Our client had further constraint that prevented them from using managed agents so first thing we had to do was to define a local pool<\/a>. The process was uneventful, so we thought we’re off to a good start. <\/p>\n\n\n\n

Creating Azure DevOps pipeline<\/h2>\n\n\n\n

Our first stab yielded a pipeline definition along the following lines:<\/p>\n\n\n\n

trigger:\n  - none\n\njobs:\n  - job: test\n    pool:\n      name: local-linux-pool\n    displayName: Build Cool software\n    steps:\n      - task: Bash@3\n        displayName: Prune leftover containers\n        inputs:\n          targetType: inline\n          script: |\n            docker system prune -f -a\n\n      - task: Docker@2\n        displayName: Build worker container\n        inputs:          \n          command: build\n          Dockerfile: 'container\/Dockerfile'\n          tags: |\n            supercool\/test-app # tagging container would simplify our next step and avoid us headaches of trying to figure out correct ID\n\n      - bash: |\n          docker run --name builderContainer -it --rm supercool\/test-app:latest # we assume latest is the correct tag here<\/code><\/pre>\n\n\n\n
Nothing fancy here. We clean the environment before each run (this would be optional but helped troubleshooting). Then we build a container from a Dockerfile we found in source control. To make sure we run the right thing on next step we want to tag it. <\/p>\n\n\n\n
But then it went sideways…<\/h2>\n\n\n\n
Unable to find image 'supercool\/test-app:latest' locally\ndocker: Error response from daemon: pull access denied for test-app, repository does not exist or may require 'docker login': denied: requested access to the resource is denied.<\/code><\/pre>\n\n\n\n
This of course means docker could not detect a local image and went off to pull it from the default registry. And we don’t want that!<\/p>\n\n\n\n
Upon further inspection we found command line that builds container DOES NOT tag it!<\/p>\n\n\n\n
\/usr\/bin\/docker build \\\n\t\t-f \/myagent\/_work\/1\/s\/container\/Dockerfile \\\n\t\t--label com.azure.dev.image.system.teamfoundationcollectionuri=https:\/\/dev.azure.com\/thisorgdoesnotexist\/ \\\n\t\t--label com.azure.dev.image.system.teamproject=test \\\n\t\t--label com.azure.dev.image.build.repository.name=test \\\n\t\t--label com.azure.dev.image.build.sourceversion=3d7a6ed84b0e9538b1b29206fd1651b44c0f74d8 \\\n\t\t--label com.azure.dev.image.build.repository.uri=https:\/\/thisorgdoesnotexist@dev.azure.com\/thisorgdoesnotexist\/test\/_git\/test \\\n\t\t--label com.azure.dev.image.build.sourcebranchname=main \\\n\t\t--label com.azure.dev.image.build.definitionname=test \\\n\t\t--label com.azure.dev.image.build.buildnumber=20262388.5 \\\n\t\t--label com.azure.dev.image.build.builduri=vstfs:\/\/\/Build\/Build\/11 \\\n\t\t--label image.base.ref.name=alpine:3.12 \\\n\t\t--label image.base.digest=sha256:a296b4c6f6ee2b88f095b61e95c7dde451ba25598835b4978c9256d8c8ace48a \\\n\t\t\/myagent\/_work\/1\/s\/container\n<\/code><\/pre>\n\n\n\n
How does this happen?<\/h2>\n\n\n\n
Luckily,  DockerV2<\/a> is Open Source and freely available on GitHub. Looking at the code, we notice an interesting error message<\/a>: \"NotAddingAnyTagsToBuild\": \"Not adding any tags to the built image as no repository is specified.\"<\/code> Is that our clue? Seems like it may be. Let’s keep digging. <\/p>\n\n\n\n
Further inspection reveals<\/a> for tags to get applied, task must be able to infer image name:<\/p>\n\n\n\n
 if (imageNames && imageNames.length > 0) {\n        ....\n        tagArguments.push(imageName);\n        ....\n    }\n    else {\n        tl.debug(tl.loc('NotAddingAnyTagsToBuild'));\n    }<\/code><\/pre>\n\n\n\n
And that information must come from a repository<\/code> input parameter. <\/p>\n\n\n\n
Repository – (Optional) Name of repository within the container registry corresponding to the Docker registry service connection specified as input for containerRegistry<\/code><\/p>Looking at the documentation<\/a>, this makes no sense<\/cite><\/blockquote>\n\n\n\n
A further peek into the source code, however, reveals that developers have kindly thought about<\/a> local tagging:<\/p>\n\n\n\n
public getQualifiedImageNamesFromConfig(repository: string, enforceDockerNamingConvention?: boolean) {\n        let imageNames: string[] = [];\n        if (repository) {\n            let regUrls = this.getRegistryUrlsFromDockerConfig();\n            if (regUrls && regUrls.length > 0) {\n\n                \/\/ not our case, skipping for brevity\n            }\n            else {\n                \/\/ in case there is no login information found and a repository is specified, the intention\n                \/\/ might be to tag the image to refer locally.\n                let imageName = repository;\n                if (enforceDockerNamingConvention) {\n                    imageName = imageUtils.generateValidImageName(imageName);\n                }\n                \n                imageNames.push(imageName);\n            }\n        }\n\n        return imageNames;\n    }<\/code><\/pre>\n\n\n\n
Now we can solve it<\/h2>\n\n\n\n
Adding repository<\/code> input to our task without specifying containerRegistry<\/code> should get us the desired result:<\/p>\n\n\n\n
...\n      - task: Docker@2\n        displayName: Build worker container\n        inputs:          \n          command: build\n          Dockerfile: 'container\/Dockerfile'\n          repository: supercool\/test-app # moving this from tag input to repository does magic!\n...<\/code><\/pre>\n\n\n\n
Looking at the logs we seem to have won:<\/p>\n\n\n\n
\/usr\/bin\/docker build \\\n\t\t-f \/myagent\/_work\/1\/s\/container\/Dockerfile \\\n\t\t#... ADO labels go here, irrelevant\n\t\t-t supercool\/test-app \\\n\t\t\/myagent\/_work\/1\/s\/container<\/code><\/pre>\n\n\n\n
Conclusion<\/h2>\n\n\n\n
This scenario, however far-fetched it may appear, seems to be fully supported. At least on the code level. Documentation is lacking a little bit, but I understand how this nuance may be hard to convey in 1-2 paragraphs when there’s so much else to cover.<\/p>\n","protected":false},"excerpt":{"rendered":"
Here’s an interesting gotcha that has kept us occupied for a little while. Our client wanted us to build an Azure DevOps pipeline that would build a container, tag it, and launch the image to do more work. As the result was not really worth pushing up to image registries, we decided to go fully … Continue reading “Things they don’t tell you – Tagging containers in Azure DevOps”<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":925,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"footnotes":""},"categories":[50],"tags":[48],"class_list":["post-919","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cloud","tag-azure"],"yoast_head":"\nThings they don't tell you - Tagging containers in Azure DevOps - Timur and associates<\/title>\n<meta name=\"description\" content=\"We have set out on a journey to build containers with Azure DevOps. 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