nixpkgs/pkgs/build-support/fetchs3/default.nix

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{ stdenvNoCC, runCommand, awscli }:
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{ s3url
, sha256
, region ? "us-east-1"
, credentials ? null # Default to looking at local EC2 metadata service
, executable ? false
, recursiveHash ? false
, postFetch ? null
}:
let
credentialAttrs = stdenvNoCC.lib.optionalAttrs (credentials != null) {
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AWS_ACCESS_KEY_ID = credentials.access_key_id;
AWS_SECRET_ACCESS_KEY = credentials.secret_access_key;
AWS_SESSION_TOKEN = credentials.session_token ? null;
};
in runCommand "foo" ({
nativeBuildInputs = [ awscli ];
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outputHashAlgo = "sha256";
outputHash = sha256;
outputHashMode = if recursiveHash then "recursive" else "flat";
} // credentialAttrs) (if postFetch != null then ''
downloadedFile="$(mktemp)"
aws s3 cp ${s3url} $downloadedFile
${postFetch}
'' else ''
aws s3 cp ${s3url} $out
'')