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nixos/k3s: support fetching helm charts from OCI registries

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This enables fetching Helm charts from OCI-based registries. OCI charts
will be detected by checking that the repo has a `oci://` prefix, the
behaviour for regular chart registries remains the same. The `name`
field can be omitted for OCI charts.
This commit is contained in:
Robert Rose 2025-05-05 11:58:39 +02:00
parent eadb306fc6
commit f5efa59ad1
1 changed files with 19 additions and 7 deletions
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26
nixos/modules/services/cluster/k3s/default.nix
View file

@ -46,8 +46,12 @@ let
)
);
# Replace characters that are problematic in file names
# Replace prefixes and characters that are problematic in file names
cleanHelmChartName =
name:
let
woPrefix = lib.removePrefix "https://" (lib.removePrefix "oci://" name);
in
lib.replaceStrings
[
"/"
@ -56,7 +60,8 @@ let
[
"-"
"-"
];
]
woPrefix;
# Fetch a Helm chart from a public registry. This only supports a basic Helm pull.
fetchHelm =
@ -66,7 +71,12 @@ let
version,
hash ? lib.fakeHash,
}:
pkgs.runCommand (cleanHelmChartName "${lib.removePrefix "https://" repo}-${name}-${version}.tgz")
let
isOci = lib.hasPrefix "oci://" repo;
pullCmd = if isOci then repo else "--repo ${repo} ${name}";
name' = if isOci then "${repo}-${version}" else "${repo}-${name}-${version}";
in
pkgs.runCommand (cleanHelmChartName "${name'}.tgz")
{
inherit (lib.fetchers.normalizeHash { } { inherit hash; }) outputHash outputHashAlgo;
impureEnvVars = lib.fetchers.proxyImpureEnvVars;
@ -76,9 +86,7 @@ let
];
}
''
export HOME="$PWD"
helm repo add repository ${repo}
helm pull repository/${name} --version ${version}
helm pull ${pullCmd} --version ${version}
mv ./*.tgz $out
'';
@ -724,7 +732,11 @@ in
};
};
};
nginx = {
repo = "oci://registry-1.docker.io/bitnamicharts/nginx";
version = "20.0.0";
hash = "sha256-sy+tzB+i9jIl/tqOMzzuhVhTU4EZVsoSBtPznxF/36c=";
};
custom-chart = {
package = ../charts/my-chart.tgz;
values = ../values/my-values.yaml;