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Graham Christensen 2752c77f8c Load a pre-built image, don't build		2023-12-04 11:49:00 -05:00
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amd64.tar.gz	Load a pre-built image, don't build	2023-12-04 11:49:00 -05:00
arm64.tar.gz	Load a pre-built image, don't build	2023-12-04 11:49:00 -05:00
Dockerfile	Load a pre-built image, don't build	2023-12-04 11:49:00 -05:00
README.md	Load a pre-built image, don't build	2023-12-04 11:49:00 -05:00

README.md

Determinate Nix Installer Action: Docker Shim

The image in this repository is a product of the contained Dockerfile. It is an otherwise empty image with a configuration layer.

This image is to be used in GitHub Actions runners which don't have systemd available, like self-hosted ARC runners.

The image would have no layers / content at all, however Docker has a bug and refuses to export those images. This isn't a technical limitation preventing us from creating and distributing that image, but an ease-of-use limitation. Since some of Docker's inspection tools break on an empty image, the image contains a single layer containing a README.

To build:

docker build . --tag determinate-nix-shim:latest
docker image save determinate-nix-shim:latest | gzip --best > amd64.tar

Then, extract the tarball:

mkdir extract
cd extract
tar -xf ../amd64.tar

It'll look like this, though the hashes will be different.

.
├── 771204abb853cdde06bbbc680001a02642050a1db1a7b0a48cf5f20efa8bdc5d.json
├── c4088111818e553e834adfc81bda8fe6da281afa9a40012eaa82796fb5476e98
│   ├── VERSION
│   ├── json
│   └── layer.tar
├── manifest.json
└── repositories

Ignore manifest.json, and edit the other two JSON documents to replace amd64 with arm64, both in a key named "architecture:

"architecture":"amd64"

Then re-create the tar, from within the extract directory:

tar --options gzip:compression-level=9 -zcf ../arm64.tar.gz .

Then git add the two .tar.gz's and you're done.