* Add flag to remap registries for any registry mirror
The purpose of this PR is to add an option to remap registries, a kind of generalized `--registry-mirror`.
This is helpful for air-gapped environments and/or when local registry mirrors are available (not limited to docker.io).
This allows user to reference any images without having to change their location.
It also permit to separate infra related configuration (the mirrors) from CI/CD pipeline definition by using an environment variable for example (the reason behind the early return if flag provided but empty).
Therefore you can have a pipeline calling kaniko with `--registry-map=$REGISTRY_MAP` and have the `REGISTRY_MAP` populated via the runner's env by another team, and the absence of env wouldn't trigger a failure, it makes the pipeline env independent.
I've also considered the option of environment variables directly but it doesn't seems to be in kaniko's philosophy.
This makes quite some duplicated code :/ One option to keep the mirror flag and behavior would be to use only one codebase and convert `--registry-mirror=VALUE` to `--registry-map=index.docker.io=VALUE` internally. Suggestions welcome!
* Configure logging config sooner to be able to use it in flag parsing
* Replace registry mirrors by maps logic and use env var
* Add env vars to README.md
* Fix test
* fix: Correct flatten function in layers
- Added a test.
- Cache current image, track deletes in `whiteouts` as well as normal adds in `layers`.
- Fix ugly delete behavior of `layerHashCache`.
Delete it when crerating a new snapshot.
- Slight cleanup in `snapshot.go`.
- Format ugly `WalkFS` function.
* fix: Add symbolic link changes to Hasher and CacheHasher
* fix: Better log messages
* fix(ci): Integration tests
* fix(ci): Add `--no-cache` to docker builds
* fix(ci): Pass credentials for error integration test
* np: Missing .gitignore in `hack`
* np: Capitalize every log message
- Correct some linting.
* fix: Key function
- Merge only last layer onto `currentImage`.
* fix: Remove old obsolete `cacheHasher`
I changed RunE to Run so that usage wouldn't show upon error. Usage will
still show if PersistentPreRunE fails, which makes sense since those
functions check to make sure arguments passed in are valid.
Also changed logging of multi arg flags to Debugf so that output would
be cleaner.
I added a KanikoStage to hold each stage of the Dockerfile along with
information about each stage that would be useful later on.
The new KanikoStage type holds the stage itself, along with some
additional information:
1. FinalStage -- whether the current stage is the final stage
2. BaseImageStoredLocally/BaseImageIndex -- whether the base image for
this stage is stored locally, and if so what the index of the base image
is
3. SaveStage -- whether this stage needs to be saved for use in a future
stage
This is the first part of a larger refactor for building stages, which
will later make it easier to add layer caching.
Damien Degois
Gabriel Nützi
Ben Einaudi
Daisuke Taniwaki
Priya Wadhwa