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@jriddy
Last active October 9, 2020 20:59
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from dataclasses import dataclass
import logging
from pathlib import Path
from pants.core.goals.package import PackageFieldSet, BuiltPackage
from pants.core.util_rules.source_files import SourceFiles, SourceFilesRequest
from pants.core.util_rules.stripped_source_files import StrippedSourceFiles
from pants.engine.addresses import Address, AddressInput
from pants.engine.fs import EMPTY_DIGEST, MergeDigests, Snapshot
from pants.engine.process import (
BinaryPathRequest,
BinaryPathTest,
BinaryPaths,
Process,
ProcessResult,
)
from pants.engine.rules import collect_rules, Get, MultiGet, rule
from pants.engine.target import (
COMMON_TARGET_FIELDS,
Dependencies,
FieldSetsPerTarget,
FieldSetsPerTargetRequest,
Sources,
Target,
Targets,
StringField,
StringSequenceField,
TransitiveTargets,
WrappedTarget,
)
from pants.engine.unions import UnionRule
from pants.util.logging import LogLevel
logger = logging.getLogger(__name__)
class DockerfileSources(Sources):
default = ['Dockerfile']
expected_num_files = 1
class DockerImageRepoName(StringField):
alias = "image_repo"
required = True
class DockerImageTagName(StringField):
alias = "image_tag"
default = "latest"
class DockerPackages(StringSequenceField):
alias = "packages"
class DockerImage(Target):
alias = "docker_image"
core_fields = (
*COMMON_TARGET_FIELDS,
Dependencies,
DockerfileSources,
DockerImageRepoName,
DockerImageTagName,
DockerPackages,
)
@dataclass(frozen=True)
class DockerImageFieldSet(PackageFieldSet):
required_fields = (DockerfileSources, DockerImageRepoName)
sources: DockerfileSources
image_repo: DockerImageRepoName
packages: DockerPackages
@rule(level=LogLevel.DEBUG)
async def create_docker_image(field_set: DockerImageFieldSet) -> BuiltPackage:
docker_paths = await Get(
BinaryPaths,
BinaryPathRequest(
binary_name="docker",
# TODO: why not just $PATH variable?
search_path=["/usr/local/bin", "/usr/bin", "/bin"],
test=BinaryPathTest(args=["--version"]),
),
)
docker_bin = docker_paths.first_path
if docker_bin is None:
raise OSError("could not find 'docker'")
dockerfile_sources = await Get(SourceFiles, SourceFilesRequest([field_set.sources]))
# TODO: swap this in when UnparsedAddressInputs becomes available
# package_targets = await Get(
# Targets,
# UnparsedAddressInputs(field_set.packages.value or (), owning_address=field_set.address),
# )
wrapped_package_targets = await MultiGet(
Get(
WrappedTarget,
AddressInput,
AddressInput.parse(spec, relative_to=field_set.address.spec_path),
)
for spec in field_set.packages.value or ()
)
package_targets = (wt.target for wt in wrapped_package_targets)
package_field_sets_per_target = await Get(
FieldSetsPerTarget, FieldSetsPerTargetRequest(PackageFieldSet, package_targets)
)
packages = await MultiGet(
Get(BuiltPackage, PackageFieldSet, field_set)
for field_set in package_field_sets_per_target.field_sets
)
input_snapshot = await Get(
Snapshot,
MergeDigests((
dockerfile_sources.snapshot.digest,
*(p.digest for p in packages),
)),
)
options = [
'-f', dockerfile_sources.snapshot.files[0],
'-t', field_set.image_repo.value,
]
result = await Get(
ProcessResult,
Process(
argv=[docker_bin.path, 'build', *options, '.'],
input_digest=input_snapshot.digest,
description=f"build {field_set.address} into a docker image",
),
)
return BuiltPackage(EMPTY_DIGEST, relpath="")
def rules():
return [
*collect_rules(),
UnionRule(PackageFieldSet, DockerImageFieldSet),
]
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