53 lines
1.5 KiB
Markdown
53 lines
1.5 KiB
Markdown
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# Determinate Nix Installer Action: Docker Shim
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The image in this repository is a product of the contained Dockerfile.
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It is an otherwise empty image with a configuration layer.
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This image is to be used in GitHub Actions runners which don't have systemd available, like self-hosted ARC runners.
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The image would have no layers / content at all, however Docker has a bug and refuses to export those images.
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This isn't a technical limitation preventing us from creating and distributing that image, but an ease-of-use limitation.
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Since some of Docker's inspection tools break on an empty image, the image contains a single layer containing a README.
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To build:
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```shell
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docker build . --tag determinate-nix-shim:latest
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docker image save determinate-nix-shim:latest | gzip --best > amd64.tar
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```
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Then, extract the tarball:
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```
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mkdir extract
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cd extract
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tar -xf ../amd64.tar
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```
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It'll look like this, though the hashes will be different.
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```
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.
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├── 771204abb853cdde06bbbc680001a02642050a1db1a7b0a48cf5f20efa8bdc5d.json
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├── c4088111818e553e834adfc81bda8fe6da281afa9a40012eaa82796fb5476e98
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│ ├── VERSION
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│ ├── json
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│ └── layer.tar
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├── manifest.json
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└── repositories
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```
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Ignore `manifest.json`, and edit the other two JSON documents to replace `amd64` with `arm64`, both in a key named "architecture:
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```
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"architecture":"amd64"
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```
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Then re-create the tar, from within the `extract` directory:
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```
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tar --options gzip:compression-level=9 -zcf ../arm64.tar.gz .
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```
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Then `git add` the two .tar.gz's and you're done.
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