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|
{ stdenv
, lib
, google-cloud-sdk
, system
, snapshotPath
, autoPatchelfHook
, python3
, ...
}:
let
# Mapping from GCS component architecture names to Nix archictecture names
arches = {
x86 = "i686";
x86_64 = "x86_64";
arm = "aarch64";
};
# Mapping from GCS component operating systems to Nix operating systems
oses = {
LINUX = "linux";
MACOSX = "darwin";
WINDOWS = "windows";
CYGWIN = "cygwin";
};
# Convert an archicecture + OS to a Nix platform
toNixPlatform = arch: os:
let
arch' = arches.${arch} or (throw "unsupported architecture '${arch}'");
os' = oses.${os} or (throw "unsupported OS '${os}'");
in
"${arch'}-${os'}";
# All architectures that are supported by GCS
allArches = builtins.attrNames arches;
# A description of all available google-cloud-sdk components.
# It's a JSON file with a list of components, along with some metadata
snapshot = builtins.fromJSON (builtins.readFile snapshotPath);
# Generate a snapshot file for a single component. It has the same format as
# `snapshot`, but only contains a single component. These files are
# installed with google-cloud-sdk to let it know which components are
# available.
snapshotFromComponent =
{ component
, revision
, schema_version
, version
}:
builtins.toJSON {
components = [ component ];
inherit revision schema_version version;
};
# Generate a set of components from a JSON file describing these components
componentsFromSnapshot =
{ components
, revision
, schema_version
, version
, ...
}:
lib.fix (
self:
builtins.listToAttrs (
builtins.map
(component: {
name = component.id;
value = componentFromSnapshot self { inherit component revision schema_version version; };
})
components
)
);
# Generate a single component from its snapshot, along with a set of
# available dependencies to choose from.
componentFromSnapshot =
# Component derivations that can be used as dependencies
components:
# This component's snapshot
{ component
, revision
, schema_version
, version
} @ attrs:
let
baseUrl = builtins.dirOf schema_version.url;
# Architectures supported by this component. Defaults to all available
# architectures.
architectures = builtins.filter
(arch: builtins.elem arch (builtins.attrNames arches))
(lib.attrByPath [ "platform" "architectures" ] allArches component);
# Operating systems supported by this component
operating_systems = builtins.filter
(os: builtins.elem os (builtins.attrNames oses))
component.platform.operating_systems;
in
mkComponent
{
pname = component.id;
version = component.version.version_string;
src =
lib.optionalString (lib.hasAttrByPath [ "data" "source" ] component) "${baseUrl}/${component.data.source}";
sha256 = lib.attrByPath [ "data" "checksum" ] "" component;
dependencies = builtins.map (dep: builtins.getAttr dep components) component.dependencies;
platforms =
if component.platform == { }
then lib.platforms.all
else
builtins.concatMap
(arch: builtins.map (os: toNixPlatform arch os) operating_systems)
architectures;
snapshot = snapshotFromComponent attrs;
};
# Filter out dependencies not supported by current system
filterForSystem = builtins.filter (drv: builtins.elem system drv.meta.platforms);
# Make a google-cloud-sdk component
mkComponent =
{ pname
, version
# Source tarball, if any
, src ? ""
# Checksum for the source tarball, if there is a source
, sha256 ? ""
# Other components this one depends on
, dependencies ? [ ]
# Short text describing the component
, description ? ""
# Platforms supported
, platforms ? lib.platforms.all
# The snapshot corresponding to this component
, snapshot
}: stdenv.mkDerivation {
inherit pname version snapshot;
src =
lib.optionalString (src != "")
(builtins.fetchurl
{
url = src;
inherit sha256;
}) ;
dontUnpack = true;
installPhase = ''
mkdir -p $out/google-cloud-sdk/.install
# If there is a source, unpack it
if [ ! -z "$src" ]; then
tar -xf $src -C $out/google-cloud-sdk/
# If the source has binaries, link them to `$out/bin`
if [ -d "$out/google-cloud-sdk/bin" ]; then
mkdir $out/bin
find $out/google-cloud-sdk/bin/ -type f -exec ln -s {} $out/bin/ \;
fi
fi
# Write the snapshot file to the `.install` folder
cp $snapshotPath $out/google-cloud-sdk/.install/${pname}.snapshot.json
'';
nativeBuildInputs = [
autoPatchelfHook
python3
stdenv.cc.cc
];
passthru = {
dependencies = filterForSystem dependencies;
};
passAsFile = [ "snapshot" ];
meta = {
inherit description platforms;
};
};
in
componentsFromSnapshot snapshot
|
