attic/ci-installer.nix

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# Generates a script to bootstrap the Attic client with a substituter for
# CI usage. Will be simplier when Attic is in cache.nixos.org.
{ self
, writeText
, writeScript
, substituter ? "https://staging.attic.rs/attic-ci"
, trustedPublicKey ? "attic-ci:U5Sey4mUxwBXM3iFapmP0/ogODXywKLRNgRPQpEXxbo="
}:
let
cacheNixosOrg = "https://cache.nixos.org";
cacheNixosOrgKey = "cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY=";
bootstrapHeader = ''
let
maybeStorePath = if builtins ? langVersion && builtins.lessThan 1 builtins.langVersion
then builtins.storePath
else x: x;
mkFakeDerivation = attrs: outputs:
let
outputNames = builtins.attrNames outputs;
common = attrs // outputsSet //
{ type = "derivation";
outputs = outputNames;
all = outputsList;
};
outputToAttrListElement = outputName:
{ name = outputName;
value = common // {
inherit outputName;
outPath = maybeStorePath (builtins.getAttr outputName outputs);
drvPath = maybeStorePath (builtins.getAttr outputName outputs);
};
};
outputsList = map outputToAttrListElement outputNames;
outputsSet = builtins.listToAttrs outputsList;
in outputsSet;
in
'';
makeBootstrap = system: let
package = self.packages.${system}.attic;
in ''
"${system}" = (mkFakeDerivation {
name = "${package.name}";
system = "${system}";
} {
out = "${package.out}";
}).out;
'';
bootstrapExpr = ''
{ system ? builtins.currentSystem }:
${bootstrapHeader}
{
${makeBootstrap "x86_64-linux"}
${makeBootstrap "aarch64-linux"}
${makeBootstrap "x86_64-darwin"}
${makeBootstrap "aarch64-darwin"}
}.''${system}
'';
bootstrapScript = writeScript "install-attic-ci.sh" ''
#!/usr/bin/env bash
set -euo pipefail
expr=$(mktemp)
cleanup() {
rm -f "$expr"
}
cat >"$expr" <<'EOF'
${bootstrapExpr}
EOF
nix-env --substituters "${substituter} ${cacheNixosOrg}" --trusted-public-keys "${trustedPublicKey} ${cacheNixosOrgKey}" -if "$expr"
'';
in bootstrapScript