constellation/bazel/mkosi/BUILD.bazel

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"""toolchain to wrap an mkosi binary.
Type: @constellation//bazel/mkosi:toolchain_type
Toolchains:
- mkosi_missing_toolchain: provides a fallback toolchain for exec platforms
where mkosi might not be available.
"""
load(":toolchain.bzl", "is_mkosi_available", "mkosi_make_variables", "mkosi_toolchain")
# Expose the availability of an actual mkosi as a config_setting, so we can
# select() on it.
config_setting(
name = "have_mkosi",
flag_values = {
":is_mkosi_available": "1",
},
visibility = ["//visibility:public"],
)
# Expose the availability of an actual mkosi as a feature flag, so we can
# create a config_setting from it.
is_mkosi_available(
name = "is_mkosi_available",
visibility = ["//:__subpackages__"],
)
toolchain_type(
name = "toolchain_type",
visibility = ["//visibility:public"],
)
mkosi_make_variables(
name = "make_variables",
visibility = ["//visibility:public"],
)
# mkosi_missing_toolchain provides a fallback toolchain so that toolchain
# resolution can succeed even on platforms that do not have a working mkosi.
# If this toolchain is selected, the constraint ":have_mkosi" will not be
# satistifed.
mkosi_toolchain(
name = "no_mkosi",
)
toolchain(
name = "mkosi_missing_toolchain",
toolchain = ":no_mkosi",
toolchain_type = ":toolchain_type",
)
mkosi_toolchain(
name = "nix_mkosi",
label = "@mkosi//:bin/mkosi",
)
toolchain(
name = "mkosi_nix_toolchain",
exec_compatible_with = [
"@rules_nixpkgs_core//constraints:support_nix",
],
toolchain = ":nix_mkosi",
toolchain_type = "@constellation//bazel/mkosi:toolchain_type",
)
exports_files(["mkosi_wrapper.sh.in"])