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fix(ci): make room on the runner before building #63

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Merged
yash-garg merged 1 commit into from
Aug 5, 2026
Merged

fix(ci): make room on the runner before building #63

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5 changes: 5 additions & 0 deletions .github/workflows/check-pre-commit-hooks.yml
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32 changes: 29 additions & 3 deletions nix/general/workflows/ci-steps.nix
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Original file line number Diff line number Diff line change
Expand Up @@ -46,10 +46,25 @@ in
readOnly = true;
};

freeDiskSpace = lib.mkOption {
description = ''
Delete the language toolchains GitHub preinstalls on its runners.

A runner has around 20 GB free, and a devshell that brings a Flutter
SDK and two Rust toolchains does not fit beside all of that. Builds
fail with "No space left on device" halfway through.

Nothing of ours uses any of it: our toolchain comes from the
devshell, which is the reason we can throw it away wholesale.
'';
type = lib.types.listOf lib.types.attrs;
readOnly = true;
};

setup = lib.mkOption {
description = ''
The steps every workflow of ours starts with: check out the
repository and install nix.
The steps every workflow of ours starts with: make room on the
runner, check out the repository and install nix.

Since the toolchain comes from the devshell, there is deliberately
no language-specific setup action here.
Expand Down Expand Up @@ -112,7 +127,18 @@ in
checkout = [ { uses = allowed-actions."actions/checkout".uses; } ];
installNix = [ { uses = allowed-actions."cachix/install-nix-action".uses; } ];

setup = steps.checkout ++ steps.installNix;
freeDiskSpace = [
{
name = "Free up disk space";
run = ''
sudo rm -rf /usr/share/dotnet /usr/share/swift /usr/local/lib/android \
/opt/ghc /opt/hostedtoolcache
df -h /
'';
}
];

setup = steps.freeDiskSpace ++ steps.checkout ++ steps.installNix;

privateDependencies = [
{
Expand Down