# Pylint doesn't play well with fixtures and dependency injection from pytest
# pylint: disable=redefined-outer-name

import os
import tarfile
import hashlib
import re

import pytest

from buildstream.testing import cli  # pylint: disable=unused-import
from buildstream.testing import create_repo
from buildstream.testing._utils.site import CASD_SEPARATE_USER
from buildstream import _yaml
from buildstream.exceptions import ErrorDomain, LoadErrorReason
from buildstream import utils

from tests.testutils import generate_junction, create_artifact_share

from . import configure_project

# Project directory
DATA_DIR = os.path.join(os.path.dirname(os.path.realpath(__file__)), "project",)


def strict_args(args, strict):
    if strict != "strict":
        return ["--no-strict", *args]
    return args


@pytest.mark.datafiles(DATA_DIR)
@pytest.mark.parametrize(
    "strict,hardlinks",
    [("strict", "copies"), ("strict", "hardlinks"), ("non-strict", "copies"), ("non-strict", "hardlinks"),],
)
def test_build_checkout(datafiles, cli, strict, hardlinks):
    if CASD_SEPARATE_USER and hardlinks == "hardlinks":
        pytest.xfail("Cannot hardlink with buildbox-casd running as a separate user")

    project = str(datafiles)
    checkout = os.path.join(cli.directory, "checkout")

    # First build it
    result = cli.run(project=project, args=strict_args(["build", "target.bst"], strict))
    result.assert_success()

    # Assert that after a successful build, the builddir is empty
    builddir = os.path.join(cli.directory, "build")
    assert os.path.isdir(builddir)
    assert not os.listdir(builddir)

    # Prepare checkout args
    checkout_args = strict_args(["artifact", "checkout"], strict)
    if hardlinks == "hardlinks":
        checkout_args += ["--hardlinks"]
    checkout_args += ["target.bst", "--directory", checkout]

    # Now check it out
    result = cli.run(project=project, args=checkout_args)
    result.assert_success()

    # Check that the executable hello file is found in the checkout
    filename = os.path.join(checkout, "usr", "bin", "hello")
    assert os.path.exists(filename)

    filename = os.path.join(checkout, "usr", "include", "pony.h")
    assert os.path.exists(filename)


@pytest.mark.datafiles(DATA_DIR)
def test_include_dot_bst_in_checkout_dirname(datafiles, cli):
    # put '.bst' on the end of the checkout directory
    # this is a regression test for a bug. The bug would
    # remove '.bst' if it appeared at the end of of the
    # "--directory" argument.
    project = str(datafiles)
    checkout = os.path.join(cli.directory, "checkout.bst")

    # build the artifact
    result = cli.run(project=project, args=["--no-strict", "build", "target.bst"])
    result.assert_success()

    # checkout
    result = cli.run(project=project, args=["artifact", "checkout", "target.bst", "--directory", checkout])
    result.assert_success()

    # check that the executable hello file is found in the checkout (ie
    # confirm files were checked out to directory called "checkout.bst"
    # (as expected) and not to a directory calld "checkout")
    filename = os.path.join(checkout, "usr", "bin", "hello")
    assert os.path.exists(filename)


@pytest.mark.datafiles(DATA_DIR)
def test_non_strict_build_strict_checkout(datafiles, cli):
    project = str(datafiles)
    checkout = os.path.join(cli.directory, "checkout")

    # First build it in non-strict mode.
    # As this is a clean build from scratch, the result and also the cache keys
    # should be identical to a build in strict mode.
    result = cli.run(project=project, args=["--no-strict", "build", "target.bst"])
    result.assert_success()

    # Now check it out in strict mode.
    # This verifies that the clean build in non-strict mode produced an artifact
    # matching the strict cache key.
    result = cli.run(project=project, args=["artifact", "checkout", "target.bst", "--directory", checkout])
    result.assert_success()

    # Check that the executable hello file is found in the checkout
    filename = os.path.join(checkout, "usr", "bin", "hello")
    assert os.path.exists(filename)


@pytest.mark.datafiles(DATA_DIR)
def test_non_strict_pull_build_strict_checkout(datafiles, cli, tmpdir):
    project = str(datafiles)
    checkout = os.path.join(cli.directory, "checkout")

    # Target with at least one (indirect) build-only dependency
    element_name = "target.bst"

    with create_artifact_share(os.path.join(str(tmpdir), "artifactshare")) as share:

        cli.configure({"artifacts": {"servers": [{"url": share.repo}]}})

        # First build it in non-strict mode with an artifact server configured.
        # With this configuration BuildStream will attempt to pull the build-only
        # dependencies after attempting to pull the target element. This means
        # that the cache key calculation of the target element has to be deferred
        # until the pull attempt of the build-only dependencies, exercising a
        # different code path.
        # As this is a clean build from scratch, the result and also the cache keys
        # should be identical to a build in strict mode.
        result = cli.run(project=project, args=["--no-strict", "build", element_name])
        result.assert_success()

        # Now check it out in strict mode.
        # This verifies that the clean build in non-strict mode produced an artifact
        # matching the strict cache key.
        result = cli.run(project=project, args=["artifact", "checkout", element_name, "--directory", checkout])
        result.assert_success()

        # Check that the executable hello file is found in the checkout
        filename = os.path.join(checkout, "usr", "bin", "hello")
        assert os.path.exists(filename)


# Regression test for https://github.com/apache/buildstream/issues/1469
# Test that artifact checkout without pull doesn't trigger a BUG in non-strict mode.
@pytest.mark.datafiles(DATA_DIR)
def test_non_strict_checkout_uncached(datafiles, cli, tmpdir):
    project = str(datafiles)
    checkout = os.path.join(cli.directory, "checkout")

    element_name = "target.bst"

    with create_artifact_share(os.path.join(str(tmpdir), "artifactshare")) as share:

        cli.configure({"artifacts": {"servers": [{"url": share.repo}]}})

        # Attempt to checkout an uncached artifact with remote artifact server
        # configured but pull disabled.
        result = cli.run(
            project=project, args=["--no-strict", "artifact", "checkout", element_name, "--directory", checkout]
        )
        result.assert_main_error(ErrorDomain.STREAM, "uncached-checkout-attempt")


@pytest.mark.datafiles(DATA_DIR)
@pytest.mark.parametrize("deps", [("run"), ("none"), ("build"), ("all")])
def test_build_checkout_deps(datafiles, cli, deps):
    project = str(datafiles)
    checkout = os.path.join(cli.directory, "checkout")
    element_name = "checkout-deps.bst"

    # First build it
    result = cli.run(project=project, args=["build", element_name])
    result.assert_success()

    # Assert that after a successful build, the builddir is empty
    builddir = os.path.join(cli.directory, "build")
    assert os.path.isdir(builddir)
    assert not os.listdir(builddir)

    # Now check it out
    result = cli.run(
        project=project, args=["artifact", "checkout", element_name, "--deps", deps, "--directory", checkout]
    )
    result.assert_success()

    # Verify output of this element
    filename = os.path.join(checkout, "etc", "buildstream", "config")
    if deps == "build":
        assert not os.path.exists(filename)
    else:
        assert os.path.exists(filename)

    # Verify output of this element's build dependencies
    filename = os.path.join(checkout, "usr", "include", "pony.h")
    if deps in ["build", "all"]:
        assert os.path.exists(filename)
    else:
        assert not os.path.exists(filename)

    # Verify output of this element's runtime dependencies
    filename = os.path.join(checkout, "usr", "bin", "hello")
    if deps in ["run", "all"]:
        assert os.path.exists(filename)
    else:
        assert not os.path.exists(filename)


@pytest.mark.datafiles(DATA_DIR)
def test_build_deps_build(datafiles, cli):
    project = str(datafiles)
    target = "checkout-deps.bst"
    build_dep = "import-dev.bst"
    runtime_dep = "import-bin.bst"

    result = cli.run(project=project, args=["build", "--deps", "build", target])
    result.assert_success()

    states = cli.get_element_states(project, [target, build_dep, runtime_dep])
    assert states[build_dep] == "cached"
    assert states[target] == "buildable"
    assert states[runtime_dep] == "buildable"


@pytest.mark.datafiles(DATA_DIR)
def test_build_checkout_unbuilt(datafiles, cli):
    project = str(datafiles)
    checkout = os.path.join(cli.directory, "checkout")

    # Check that checking out an unbuilt element fails nicely
    result = cli.run(project=project, args=["artifact", "checkout", "target.bst", "--directory", checkout])
    result.assert_main_error(ErrorDomain.STREAM, "uncached-checkout-attempt")


@pytest.mark.datafiles(DATA_DIR)
def test_build_checkout_compression_no_tar(datafiles, cli):
    project = str(datafiles)
    checkout = os.path.join(cli.directory, "checkout.tar")

    result = cli.run(project=project, args=["build", "target.bst"])
    result.assert_success()

    checkout_args = ["artifact", "checkout", "--directory", checkout, "--compression", "gz", "target.bst"]

    result = cli.run(project=project, args=checkout_args)
    assert "ERROR: --compression can only be provided if --tar is provided" in result.stderr
    assert result.exit_code != 0


# If we don't support the extension, we default to an uncompressed tarball
@pytest.mark.datafiles(DATA_DIR)
def test_build_checkout_tar_with_unconventional_name(datafiles, cli):
    project = str(datafiles)
    checkout = os.path.join(cli.directory, "checkout.foo")

    result = cli.run(project=project, args=["build", "target.bst"])
    result.assert_success()

    checkout_args = ["artifact", "checkout", "--tar", checkout, "target.bst"]

    result = cli.run(project=project, args=checkout_args)
    result.assert_success()

    with tarfile.open(name=checkout, mode="r") as tar:
        assert os.path.join(".", "usr", "bin", "hello") in tar.getnames()
        assert os.path.join(".", "usr", "include", "pony.h") in tar.getnames()


@pytest.mark.datafiles(DATA_DIR)
def test_build_checkout_tar_with_unsupported_ext(datafiles, cli):
    project = str(datafiles)
    checkout = os.path.join(cli.directory, "checkout.tar.foo")

    result = cli.run(project=project, args=["build", "target.bst"])
    result.assert_success()

    checkout_args = ["artifact", "checkout", "--tar", checkout, "target.bst"]

    result = cli.run(project=project, args=checkout_args)
    assert (
        "Invalid file extension given with '--tar': Expected compression with unknown file extension ('.foo'), "
        "supported extensions are ('.tar'), ('.gz'), ('.xz'), ('.bz2')" in result.stderr
    )


@pytest.mark.datafiles(DATA_DIR)
def test_build_checkout_tar_no_compression(datafiles, cli):
    project = str(datafiles)
    checkout = os.path.join(cli.directory, "checkout.tar.gz")

    result = cli.run(project=project, args=["build", "target.bst"])
    result.assert_success()

    builddir = os.path.join(cli.directory, "build")
    assert os.path.isdir(builddir)
    assert not os.listdir(builddir)

    checkout_args = ["artifact", "checkout", "--tar", checkout, "target.bst"]

    result = cli.run(project=project, args=checkout_args)
    result.assert_success()

    with tarfile.open(name=checkout, mode="r:gz") as tar:
        assert os.path.join(".", "usr", "bin", "hello") in tar.getnames()
        assert os.path.join(".", "usr", "include", "pony.h") in tar.getnames()


@pytest.mark.datafiles(DATA_DIR)
def test_build_checkout_tarball(datafiles, cli):
    project = str(datafiles)
    checkout = os.path.join(cli.directory, "checkout.tar")

    # Work-around datafiles not preserving mode
    os.chmod(os.path.join(project, "files/bin-files/usr/bin/hello"), 0o0755)

    result = cli.run(project=project, args=["build", "target.bst"])
    result.assert_success()

    builddir = os.path.join(cli.directory, "build")
    assert os.path.isdir(builddir)
    assert not os.listdir(builddir)

    checkout_args = ["artifact", "checkout", "--tar", checkout, "target.bst"]

    result = cli.run(project=project, args=checkout_args)
    result.assert_success()

    with tarfile.TarFile(checkout) as tar:
        tarinfo = tar.getmember(os.path.join(".", "usr", "bin", "hello"))
        assert tarinfo.mode == 0o755
        assert tarinfo.uid == 0 and tarinfo.gid == 0
        assert tarinfo.uname == "" and tarinfo.gname == ""

        tarinfo = tar.getmember(os.path.join(".", "usr", "include", "pony.h"))
        assert tarinfo.mode == 0o644
        assert tarinfo.uid == 0 and tarinfo.gid == 0
        assert tarinfo.uname == "" and tarinfo.gname == ""


@pytest.mark.datafiles(DATA_DIR)
def test_build_checkout_using_ref(datafiles, cli):
    project = str(datafiles)
    checkout = os.path.join(cli.directory, "checkout")

    result = cli.run(project=project, args=["build", "checkout-deps.bst"])
    result.assert_success()

    key = cli.get_element_key(project, "checkout-deps.bst")
    checkout_args = ["artifact", "checkout", "--directory", checkout, "--deps", "none", "test/checkout-deps/" + key]

    result = cli.run(project=project, args=checkout_args)
    result.assert_success()

    filename = os.path.join(checkout, "etc", "buildstream", "config")
    assert os.path.exists(filename)


@pytest.mark.datafiles(DATA_DIR)
def test_build_checkout_tarball_using_ref(datafiles, cli):
    project = str(datafiles)
    checkout = os.path.join(cli.directory, "checkout.tar")

    result = cli.run(project=project, args=["build", "checkout-deps.bst"])
    result.assert_success()

    builddir = os.path.join(cli.directory, "build")
    assert os.path.isdir(builddir)
    assert not os.listdir(builddir)

    key = cli.get_element_key(project, "checkout-deps.bst")
    checkout_args = ["artifact", "checkout", "--deps", "none", "--tar", checkout, "test/checkout-deps/" + key]

    result = cli.run(project=project, args=checkout_args)
    result.assert_success()

    with tarfile.TarFile(checkout) as tar:
        assert os.path.join(".", "etc", "buildstream", "config") in tar.getnames()


@pytest.mark.datafiles(DATA_DIR)
def test_build_checkout_build_deps_using_ref(datafiles, cli):
    project = str(datafiles)
    checkout = os.path.join(cli.directory, "checkout")

    result = cli.run(project=project, args=["build", "checkout-deps.bst"])
    result.assert_success()

    key = cli.get_element_key(project, "checkout-deps.bst")
    checkout_args = ["artifact", "checkout", "--directory", checkout, "--deps", "build", "test/checkout-deps/" + key]

    result = cli.run(project=project, args=checkout_args)
    result.assert_success()

    build_dep_files = os.path.join(checkout, "usr", "include", "pony.h")
    runtime_dep_files = os.path.join(checkout, "usr", "bin", "hello")
    target_files = os.path.join(checkout, "etc", "buildstream", "config")
    assert os.path.exists(build_dep_files)
    assert not os.path.exists(runtime_dep_files)
    assert not os.path.exists(target_files)


@pytest.mark.datafiles(DATA_DIR)
def test_build_checkout_runtime_deps_using_ref_fails(datafiles, cli):
    project = str(datafiles)
    checkout = os.path.join(cli.directory, "checkout")

    result = cli.run(project=project, args=["build", "checkout-deps.bst"])
    result.assert_success()

    key = cli.get_element_key(project, "checkout-deps.bst")
    checkout_args = ["artifact", "checkout", "--directory", checkout, "--deps", "run", "test/checkout-deps/" + key]

    result = cli.run(project=project, args=checkout_args)
    result.assert_main_error(ErrorDomain.STREAM, "deps-not-supported")


@pytest.mark.datafiles(DATA_DIR)
def test_build_checkout_invalid_ref(datafiles, cli):
    project = str(datafiles)
    checkout = os.path.join(cli.directory, "checkout.tar")

    result = cli.run(project=project, args=["build", "checkout-deps.bst"])
    result.assert_success()

    builddir = os.path.join(cli.directory, "build")
    assert os.path.isdir(builddir)
    assert not os.listdir(builddir)

    non_existent_artifact = "test/checkout-deps/aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
    checkout_args = ["artifact", "checkout", "--deps", "none", "--tar", checkout, non_existent_artifact]
    result = cli.run(project=project, args=checkout_args)
    result.assert_main_error(ErrorDomain.STREAM, "missing-sandbox-config")


@pytest.mark.datafiles(DATA_DIR)
def test_build_checkout_no_tar_no_directory(datafiles, cli, tmpdir):
    project = str(datafiles)
    runtestdir = str(tmpdir)

    result = cli.run(project=project, args=["build", "target.bst"])
    result.assert_success()

    checkout_args = ["artifact", "checkout", "target.bst"]

    result = cli.run(cwd=runtestdir, project=project, args=checkout_args)
    result.assert_success()
    filename = os.path.join(runtestdir, "target", "usr", "bin", "hello")
    assert os.path.exists(filename)
    filename = os.path.join(runtestdir, "target", "usr", "include", "pony.h")
    assert os.path.exists(filename)


@pytest.mark.datafiles(DATA_DIR)
@pytest.mark.parametrize("compression", [("gz"), ("xz"), ("bz2")])
def test_build_checkout_tarball_compression(datafiles, cli, compression):
    project = str(datafiles)
    checkout = os.path.join(cli.directory, "checkout.tar")

    result = cli.run(project=project, args=["build", "target.bst"])
    result.assert_success()

    builddir = os.path.join(cli.directory, "build")
    assert os.path.isdir(builddir)
    assert not os.listdir(builddir)

    checkout_args = ["artifact", "checkout", "--tar", checkout, "--compression", compression, "target.bst"]

    result = cli.run(project=project, args=checkout_args)
    result.assert_success()

    with tarfile.open(name=checkout, mode="r:" + compression) as tar:
        assert os.path.join(".", "usr", "bin", "hello") in tar.getnames()
        assert os.path.join(".", "usr", "include", "pony.h") in tar.getnames()


@pytest.mark.datafiles(DATA_DIR)
def test_build_checkout_tarball_stdout(datafiles, cli):
    project = str(datafiles)
    tarball = os.path.join(cli.directory, "tarball.tar")

    result = cli.run(project=project, args=["build", "target.bst"])
    result.assert_success()

    builddir = os.path.join(cli.directory, "build")
    assert os.path.isdir(builddir)
    assert not os.listdir(builddir)

    checkout_args = ["artifact", "checkout", "--tar", "-", "target.bst"]

    result = cli.run(project=project, args=checkout_args, binary_capture=True)
    result.assert_success()

    with open(tarball, "wb") as f:
        f.write(result.output)

    with tarfile.TarFile(tarball) as tar:
        assert os.path.join(".", "usr", "bin", "hello") in tar.getnames()
        assert os.path.join(".", "usr", "include", "pony.h") in tar.getnames()


@pytest.mark.datafiles(DATA_DIR)
def test_build_checkout_tarball_mtime_nonzero(datafiles, cli):
    project = str(datafiles)
    tarpath = os.path.join(cli.directory, "mtime_tar.tar")

    result = cli.run(project=project, args=["build", "target.bst"])
    result.assert_success()

    checkout_args = ["artifact", "checkout", "--tar", tarpath, "target.bst"]
    result = cli.run(project=project, args=checkout_args)
    result.assert_success()

    with tarfile.TarFile(tarpath) as tar:
        for tarinfo in tar.getmembers():
            # An mtime of zero can be confusing to other software,
            # e.g. ninja build and template toolkit have both taken zero mtime to
            # mean 'file does not exist'.
            assert tarinfo.mtime > 0


@pytest.mark.datafiles(DATA_DIR)
def test_build_checkout_tarball_is_deterministic(datafiles, cli):
    project = str(datafiles)
    tarball1 = os.path.join(cli.directory, "tarball1.tar")
    tarball2 = os.path.join(cli.directory, "tarball2.tar")

    result = cli.run(project=project, args=["build", "target.bst"])
    result.assert_success()

    builddir = os.path.join(cli.directory, "build")
    assert os.path.isdir(builddir)
    assert not os.listdir(builddir)

    checkout_args = ["artifact", "checkout", "--force", "target.bst"]

    checkout_args1 = checkout_args + ["--tar", tarball1]
    result = cli.run(project=project, args=checkout_args1)
    result.assert_success()

    checkout_args2 = checkout_args + ["--tar", tarball2]
    result = cli.run(project=project, args=checkout_args2)
    result.assert_success()

    with open(tarball1, "rb") as f:
        contents = f.read()
    hash1 = hashlib.sha1(contents).hexdigest()

    with open(tarball2, "rb") as f:
        contents = f.read()
    hash2 = hashlib.sha1(contents).hexdigest()

    assert hash1 == hash2


@pytest.mark.datafiles(DATA_DIR)
def test_build_checkout_tarball_links(datafiles, cli):
    project = str(datafiles)
    checkout = os.path.join(cli.directory, "checkout.tar")
    extract = os.path.join(cli.directory, "extract")

    # Create the link before running the tests.
    # This is needed for users working on Windows, git checks out symlinks as files which content is the name
    # of the symlink and the test therefore doesn't have the correct content
    os.symlink(
        os.path.join("..", "basicfile"),
        os.path.join(project, "files", "files-and-links", "basicfolder", "basicsymlink"),
    )

    result = cli.run(project=project, args=["build", "import-links.bst"])
    result.assert_success()

    builddir = os.path.join(cli.directory, "build")
    assert os.path.isdir(builddir)
    assert not os.listdir(builddir)

    checkout_args = ["artifact", "checkout", "--tar", checkout, "import-links.bst"]

    result = cli.run(project=project, args=checkout_args)
    result.assert_success()

    with tarfile.open(name=checkout, mode="r:") as tar:
        tar.extractall(extract)

    with open(os.path.join(extract, "basicfolder", "basicsymlink"), encoding="utf-8") as fp:
        data = fp.read()
    assert data == "file contents\n"


@pytest.mark.datafiles(DATA_DIR)
def test_build_checkout_links(datafiles, cli):
    project = str(datafiles)
    checkout = os.path.join(cli.directory, "checkout")

    # Create the link before running the tests.
    # This is needed for users working on Windows, git checks out symlinks as files which content is the name
    # of the symlink and the test therefore doesn't have the correct content
    os.symlink(
        os.path.join("..", "basicfile"),
        os.path.join(project, "files", "files-and-links", "basicfolder", "basicsymlink"),
    )

    result = cli.run(project=project, args=["build", "import-links.bst"])
    result.assert_success()

    builddir = os.path.join(cli.directory, "build")
    assert os.path.isdir(builddir)
    assert not os.listdir(builddir)

    checkout_args = ["artifact", "checkout", "--directory", checkout, "import-links.bst"]

    result = cli.run(project=project, args=checkout_args)
    result.assert_success()

    with open(os.path.join(checkout, "basicfolder", "basicsymlink"), encoding="utf-8") as fp:
        data = fp.read()
    assert data == "file contents\n"


@pytest.mark.datafiles(DATA_DIR)
@pytest.mark.parametrize("hardlinks", [("copies"), ("hardlinks")])
def test_build_checkout_nonempty(datafiles, cli, hardlinks):
    project = str(datafiles)
    checkout = os.path.join(cli.directory, "checkout")
    filename = os.path.join(checkout, "file.txt")

    # First build it
    result = cli.run(project=project, args=["build", "target.bst"])
    result.assert_success()

    # Assert that after a successful build, the builddir is empty
    builddir = os.path.join(cli.directory, "build")
    assert os.path.isdir(builddir)
    assert not os.listdir(builddir)

    # Create the checkout dir and add a file to it, should cause checkout to fail
    os.makedirs(checkout, exist_ok=True)
    with open(filename, "w", encoding="utf-8") as f:
        f.write("Hello")

    # Prepare checkout args
    checkout_args = ["artifact", "checkout"]
    if hardlinks == "hardlinks":
        checkout_args += ["--hardlinks"]
    checkout_args += ["target.bst", "--directory", checkout]

    # Now check it out
    result = cli.run(project=project, args=checkout_args)
    result.assert_main_error(ErrorDomain.STREAM, None)


@pytest.mark.datafiles(DATA_DIR)
@pytest.mark.parametrize("hardlinks", [("copies"), ("hardlinks")])
def test_build_checkout_force(datafiles, cli, hardlinks):
    if CASD_SEPARATE_USER and hardlinks == "hardlinks":
        pytest.xfail("Cannot hardlink with buildbox-casd running as a separate user")

    project = str(datafiles)
    checkout = os.path.join(cli.directory, "checkout")
    filename = os.path.join(checkout, "file.txt")

    # First build it
    result = cli.run(project=project, args=["build", "target.bst"])
    result.assert_success()

    # Assert that after a successful build, the builddir is empty
    builddir = os.path.join(cli.directory, "build")
    assert os.path.isdir(builddir)
    assert not os.listdir(builddir)

    # Create the checkout dir and add a file to it, should cause checkout to fail
    os.makedirs(checkout, exist_ok=True)
    with open(filename, "w", encoding="utf-8") as f:
        f.write("Hello")

    # Prepare checkout args
    checkout_args = ["artifact", "checkout", "--force"]
    if hardlinks == "hardlinks":
        checkout_args += ["--hardlinks"]
    checkout_args += ["target.bst", "--directory", checkout]

    # Now check it out
    result = cli.run(project=project, args=checkout_args)
    result.assert_success()

    # Check that the file we added is still there
    filename = os.path.join(checkout, "file.txt")
    assert os.path.exists(filename)

    # Check that the executable hello file is found in the checkout
    filename = os.path.join(checkout, "usr", "bin", "hello")
    assert os.path.exists(filename)

    # Check that the executable hello file is found in the checkout
    filename = os.path.join(checkout, "usr", "include", "pony.h")
    assert os.path.exists(filename)


@pytest.mark.datafiles(DATA_DIR)
def test_build_checkout_force_tarball(datafiles, cli):
    project = str(datafiles)
    tarball = os.path.join(cli.directory, "tarball.tar")

    result = cli.run(project=project, args=["build", "target.bst"])
    result.assert_success()

    builddir = os.path.join(cli.directory, "build")
    assert os.path.isdir(builddir)
    assert not os.listdir(builddir)

    with open(tarball, "w", encoding="utf-8") as f:
        f.write("Hello")

    checkout_args = ["artifact", "checkout", "--force", "--tar", tarball, "target.bst"]

    result = cli.run(project=project, args=checkout_args)
    result.assert_success()

    with tarfile.TarFile(tarball) as tar:
        assert os.path.join(".", "usr", "bin", "hello") in tar.getnames()
        assert os.path.join(".", "usr", "include", "pony.h") in tar.getnames()


@pytest.mark.datafiles(DATA_DIR)
def test_install_to_build(cli, datafiles):
    project = str(datafiles)
    element = "installed-to-build.bst"

    # Attempt building the element
    # We expect this to throw an ElementError, since the element will
    # attempt to stage into /buildstream/build, which is not allowed.
    result = cli.run(project=project, args=strict_args(["build", element], True))

    result.assert_main_error(ErrorDomain.STREAM, None)
    result.assert_task_error(ErrorDomain.ELEMENT, None)


@pytest.mark.datafiles(DATA_DIR)
@pytest.mark.parametrize("ref_storage", [("inline"), ("project.refs")])
def test_inconsistent_junction(cli, tmpdir, datafiles, ref_storage):
    project = str(datafiles)
    subproject_path = os.path.join(project, "files", "sub-project")
    junction_path = os.path.join(project, "elements", "junction.bst")
    element_path = os.path.join(project, "elements", "junction-dep.bst")

    configure_project(project, {"ref-storage": ref_storage})

    # Create a repo to hold the subproject and generate a junction element for it
    generate_junction(tmpdir, subproject_path, junction_path, store_ref=False)

    # Create a stack element to depend on a cross junction element
    #
    element = {"kind": "stack", "depends": [{"junction": "junction.bst", "filename": "import-etc.bst"}]}
    _yaml.roundtrip_dump(element, element_path)

    # Now try to track it, this will bail with the appropriate error
    # informing the user to track the junction first
    result = cli.run(project=project, args=["build", "junction-dep.bst"])
    result.assert_main_error(ErrorDomain.LOAD, LoadErrorReason.SUBPROJECT_INCONSISTENT)

    # Assert that we have the expected provenance encoded into the error
    element_node = _yaml.load(element_path, shortname="junction-dep.bst")
    ref_node = element_node.get_sequence("depends").mapping_at(0)
    provenance = ref_node.get_provenance()
    assert str(provenance) in result.stderr


@pytest.mark.datafiles(DATA_DIR)
@pytest.mark.parametrize("ref_storage", [("inline"), ("project.refs")])
def test_unfetched_junction(cli, tmpdir, datafiles, ref_storage):
    project = str(datafiles)
    subproject_path = os.path.join(project, "files", "sub-project")
    junction_path = os.path.join(project, "elements", "junction.bst")
    element_path = os.path.join(project, "elements", "junction-dep.bst")

    configure_project(project, {"ref-storage": ref_storage})

    # Create a repo to hold the subproject and generate a junction element for it
    ref = generate_junction(tmpdir, subproject_path, junction_path, store_ref=(ref_storage == "inline"))

    # Create a stack element to depend on a cross junction element
    #
    element = {"kind": "stack", "depends": [{"junction": "junction.bst", "filename": "import-etc.bst"}]}
    _yaml.roundtrip_dump(element, element_path)

    # Dump a project.refs if we're using project.refs storage
    #
    if ref_storage == "project.refs":
        project_refs = {"projects": {"test": {"junction.bst": [{"ref": ref}]}}}
        _yaml.roundtrip_dump(project_refs, os.path.join(project, "junction.refs"))

    # Now try to build it, this should automatically result in fetching
    # the junction itself at load time.
    result = cli.run(project=project, args=["build", "junction-dep.bst"])
    result.assert_success()

    # Assert that it's cached now
    assert cli.get_element_state(project, "junction-dep.bst") == "cached"


@pytest.mark.datafiles(DATA_DIR)
def test_build_checkout_junction(cli, tmpdir, datafiles):
    project = str(datafiles)
    subproject_path = os.path.join(project, "files", "sub-project")
    junction_path = os.path.join(project, "elements", "junction.bst")
    element_path = os.path.join(project, "elements", "junction-dep.bst")
    checkout = os.path.join(cli.directory, "checkout")

    # Create a repo to hold the subproject and generate a junction element for it
    generate_junction(tmpdir, subproject_path, junction_path)

    # Create a stack element to depend on a cross junction element
    #
    element = {"kind": "stack", "depends": [{"junction": "junction.bst", "filename": "import-etc.bst"}]}
    _yaml.roundtrip_dump(element, element_path)

    # Now try to build it, this should automatically result in fetching
    # the junction itself at load time.
    result = cli.run(project=project, args=["build", "junction-dep.bst"])
    result.assert_success()

    # Assert that it's cached now
    assert cli.get_element_state(project, "junction-dep.bst") == "cached"

    # Now check it out
    result = cli.run(project=project, args=["artifact", "checkout", "junction-dep.bst", "--directory", checkout])
    result.assert_success()

    # Assert the content of /etc/animal.conf
    filename = os.path.join(checkout, "etc", "animal.conf")
    assert os.path.exists(filename)
    with open(filename, "r", encoding="utf-8") as f:
        contents = f.read()
    assert contents == "animal=Pony\n"


@pytest.mark.datafiles(DATA_DIR)
def test_build_checkout_workspaced_junction(cli, tmpdir, datafiles):
    project = str(datafiles)
    subproject_path = os.path.join(project, "files", "sub-project")
    junction_path = os.path.join(project, "elements", "junction.bst")
    element_path = os.path.join(project, "elements", "junction-dep.bst")
    workspace = os.path.join(cli.directory, "workspace")
    checkout = os.path.join(cli.directory, "checkout")

    # Create a repo to hold the subproject and generate a junction element for it
    generate_junction(tmpdir, subproject_path, junction_path)

    # Create a stack element to depend on a cross junction element
    #
    element = {"kind": "stack", "depends": [{"junction": "junction.bst", "filename": "import-etc.bst"}]}
    _yaml.roundtrip_dump(element, element_path)

    # Now open a workspace on the junction
    #
    result = cli.run(project=project, args=["workspace", "open", "--directory", workspace, "junction.bst"])
    result.assert_success()
    filename = os.path.join(workspace, "files", "etc-files", "etc", "animal.conf")

    # Assert the content of /etc/animal.conf in the workspace
    assert os.path.exists(filename)
    with open(filename, "r", encoding="utf-8") as f:
        contents = f.read()
    assert contents == "animal=Pony\n"

    # Modify the content of the animal.conf in the workspace
    with open(filename, "w", encoding="utf-8") as f:
        f.write("animal=Horsy\n")

    # Now try to build it, this should automatically result in fetching
    # the junction itself at load time.
    result = cli.run(project=project, args=["build", "junction-dep.bst"])
    result.assert_success()

    # Assert that it's cached now
    assert cli.get_element_state(project, "junction-dep.bst") == "cached"

    # Now check it out
    result = cli.run(project=project, args=["artifact", "checkout", "junction-dep.bst", "--directory", checkout])
    result.assert_success()

    # Assert the workspace modified content of /etc/animal.conf
    filename = os.path.join(checkout, "etc", "animal.conf")
    assert os.path.exists(filename)
    with open(filename, "r", encoding="utf-8") as f:
        contents = f.read()
    assert contents == "animal=Horsy\n"


@pytest.mark.datafiles(DATA_DIR)
def test_build_checkout_cross_junction(datafiles, cli, tmpdir):
    project = str(datafiles)
    subproject_path = os.path.join(project, "files", "sub-project")
    junction_path = os.path.join(project, "elements", "junction.bst")
    checkout = os.path.join(cli.directory, "checkout")

    generate_junction(tmpdir, subproject_path, junction_path)

    result = cli.run(project=project, args=["build", "junction.bst:import-etc.bst"])
    result.assert_success()

    result = cli.run(
        project=project, args=["artifact", "checkout", "junction.bst:import-etc.bst", "--directory", checkout]
    )
    result.assert_success()

    filename = os.path.join(checkout, "etc", "animal.conf")
    assert os.path.exists(filename)


@pytest.mark.datafiles(DATA_DIR)
def test_build_junction_short_notation(cli, tmpdir, datafiles):
    project = str(datafiles)
    subproject_path = os.path.join(project, "files", "sub-project")
    junction_path = os.path.join(project, "elements", "junction.bst")
    element_path = os.path.join(project, "elements", "junction-dep.bst")
    checkout = os.path.join(cli.directory, "checkout")

    # Create a repo to hold the subproject and generate a junction element for it
    generate_junction(tmpdir, subproject_path, junction_path)

    # Create a stack element to depend on a cross junction element, using
    # colon (:) as the separator
    element = {"kind": "stack", "depends": ["junction.bst:import-etc.bst"]}
    _yaml.roundtrip_dump(element, element_path)

    # Now try to build it, this should automatically result in fetching
    # the junction itself at load time.
    result = cli.run(project=project, args=["build", "junction-dep.bst"])
    result.assert_success()

    # Assert that it's cached now
    assert cli.get_element_state(project, "junction-dep.bst") == "cached"

    # Now check it out
    result = cli.run(project=project, args=["artifact", "checkout", "junction-dep.bst", "--directory", checkout])
    result.assert_success()

    # Assert the content of /etc/animal.conf
    filename = os.path.join(checkout, "etc", "animal.conf")
    assert os.path.exists(filename)
    with open(filename, "r", encoding="utf-8") as f:
        contents = f.read()
    assert contents == "animal=Pony\n"


@pytest.mark.datafiles(DATA_DIR)
def test_build_junction_short_notation_filename(cli, tmpdir, datafiles):
    project = str(datafiles)
    subproject_path = os.path.join(project, "files", "sub-project")
    junction_path = os.path.join(project, "elements", "junction.bst")
    element_path = os.path.join(project, "elements", "junction-dep.bst")
    checkout = os.path.join(cli.directory, "checkout")

    # Create a repo to hold the subproject and generate a junction element for it
    generate_junction(tmpdir, subproject_path, junction_path)

    # Create a stack element to depend on a cross junction element, using
    # colon (:) as the separator
    element = {"kind": "stack", "depends": [{"filename": "junction.bst:import-etc.bst"}]}
    _yaml.roundtrip_dump(element, element_path)

    # Now try to build it, this should automatically result in fetching
    # the junction itself at load time.
    result = cli.run(project=project, args=["build", "junction-dep.bst"])
    result.assert_success()

    # Assert that it's cached now
    assert cli.get_element_state(project, "junction-dep.bst") == "cached"

    # Now check it out
    result = cli.run(project=project, args=["artifact", "checkout", "junction-dep.bst", "--directory", checkout])
    result.assert_success()

    # Assert the content of /etc/animal.conf
    filename = os.path.join(checkout, "etc", "animal.conf")
    assert os.path.exists(filename)
    with open(filename, "r", encoding="utf-8") as f:
        contents = f.read()
    assert contents == "animal=Pony\n"


@pytest.mark.datafiles(DATA_DIR)
def test_build_junction_short_notation_with_junction(cli, tmpdir, datafiles):
    project = str(datafiles)
    subproject_path = os.path.join(project, "files", "sub-project")
    junction_path = os.path.join(project, "elements", "junction.bst")
    element_path = os.path.join(project, "elements", "junction-dep.bst")

    # Create a repo to hold the subproject and generate a junction element for it
    generate_junction(tmpdir, subproject_path, junction_path)

    # Create a stack element to depend on a cross junction element, using
    # colon (:) as the separator
    element = {"kind": "stack", "depends": [{"filename": "junction.bst:import-etc.bst", "junction": "junction.bst",}]}
    _yaml.roundtrip_dump(element, element_path)

    # Now try to build it, this should fail as filenames should not contain
    # `:` when junction is explicity specified
    result = cli.run(project=project, args=["build", "junction-dep.bst"])
    result.assert_main_error(ErrorDomain.LOAD, LoadErrorReason.INVALID_DATA)


@pytest.mark.datafiles(DATA_DIR)
def test_build_junction_transitive_short_notation_with_junction(cli, tmpdir, datafiles):
    project = str(datafiles)
    subproject_path = os.path.join(project, "files", "sub-project")
    junction_path = os.path.join(project, "elements", "junction.bst")
    element_path = os.path.join(project, "elements", "junction-dep.bst")

    # Create a repo to hold the subproject and generate a junction element for it
    generate_junction(tmpdir, subproject_path, junction_path)

    # Create a stack element to depend on a cross junction element, using
    # colon (:) as the separator
    element = {"kind": "stack", "depends": ["junction.bst:import-etc.bst:foo.bst"]}
    _yaml.roundtrip_dump(element, element_path)

    # Now try to build it, this should fail as recursive lookups for
    # cross-junction elements is not allowed.
    result = cli.run(project=project, args=["build", "junction-dep.bst"])
    result.assert_main_error(ErrorDomain.LOAD, LoadErrorReason.INVALID_DATA)


# Should check that after a build we have partial artifacts locally, but should
# then attempt to fetch them when doing a artifact checkout
@pytest.mark.datafiles(DATA_DIR)
def test_partial_artifact_checkout_fetch(cli, datafiles, tmpdir):
    project = str(datafiles)
    checkout_dir = os.path.join(str(tmpdir), "checkout")

    repo = create_repo("git", str(tmpdir))
    repo.create(os.path.join(str(datafiles), "files"))
    element_dir = os.path.join(str(tmpdir), "elements")
    project = str(tmpdir)
    project_config = {
        "name": "partial-artifact-checkout-fetch",
        "min-version": "2.0",
        "element-path": "elements",
    }
    project_file = os.path.join(str(tmpdir), "project.conf")
    _yaml.roundtrip_dump(project_config, project_file)
    input_config = {
        "kind": "import",
        "sources": [repo.source_config()],
    }
    input_name = "input.bst"
    input_file = os.path.join(element_dir, input_name)
    _yaml.roundtrip_dump(input_config, input_file)

    with create_artifact_share(os.path.join(str(tmpdir), "artifactshare")) as share:

        cli.configure({"artifacts": {"servers": [{"url": share.repo, "push": True}]}})

        result = cli.run(project=project, args=["source", "track", input_name])
        result.assert_success()
        result = cli.run(project=project, args=["build", input_name])
        result.assert_success()

        # A push artifact cache means we have to pull to push to them, so
        # delete some blobs from that CAS such that we have to fetch
        digest = utils.sha256sum(os.path.join(project, "files", "bin-files", "usr", "bin", "hello"))
        objpath = os.path.join(cli.directory, "cas", "objects", digest[:2], digest[2:])
        os.unlink(objpath)

        # Verify that the build-only dependency is not (complete) in the local cache
        cli.configure({"artifacts": {}})
        result = cli.run(project=project, args=["artifact", "checkout", input_name, "--directory", checkout_dir])
        result.assert_main_error(ErrorDomain.STREAM, "uncached-checkout-attempt")

        # Verify that the pull method fetches relevant artifacts in order to stage
        cli.configure({"artifacts": {"servers": [{"url": share.repo, "push": True}]}})
        result = cli.run(project=project, args=["artifact", "checkout", input_name, "--directory", checkout_dir])
        result.assert_success()

        # should have pulled whatever was deleted previous
        assert input_name in result.get_pulled_elements()


@pytest.mark.datafiles(DATA_DIR)
def test_partial_checkout_fail(tmpdir, datafiles, cli):
    project = str(datafiles)
    build_elt = "import-bin.bst"
    checkout_dir = os.path.join(str(tmpdir), "checkout")

    with create_artifact_share(os.path.join(str(tmpdir), "artifactshare")) as share:

        cli.configure({"artifacts": {"servers": [{"url": share.repo, "push": True}]}})

        res = cli.run(project=project, args=["artifact", "checkout", build_elt, "--directory", checkout_dir])
        res.assert_main_error(ErrorDomain.STREAM, "uncached-checkout-attempt")
        assert re.findall(r"Remote \((\S+)\) does not have artifact (\S+) cached", res.stderr)


# Regression test for https://gitlab.com/BuildStream/buildstream/-/issues/1367.
# Make sure that `artifact checkout` fails gracefully when no arguments are
# provided.
@pytest.mark.datafiles(DATA_DIR)
def test_fail_no_args(datafiles, cli):
    project = str(datafiles)

    result = cli.run(project=project, args=["artifact", "checkout"])
    result.assert_main_error(ErrorDomain.APP, None)
    assert "Missing argument" in result.stderr