dfec7aca9d
Convert the `f""` into a `""`, since no format identifier is used. This makes pylint happier!
127 lines
4.7 KiB
Python
127 lines
4.7 KiB
Python
|
|
import contextlib
|
|
import importlib
|
|
import importlib.util
|
|
import os
|
|
import platform
|
|
import shutil
|
|
import subprocess
|
|
import tempfile
|
|
|
|
|
|
__all__ = [
|
|
"BuildRoot",
|
|
]
|
|
|
|
|
|
class BuildRoot(contextlib.AbstractContextManager):
|
|
def __init__(self, root, runner, path="/run/osbuild", libdir=None, var="/var/tmp"):
|
|
self.root = tempfile.mkdtemp(prefix="osbuild-buildroot-", dir=path)
|
|
self.api = tempfile.mkdtemp(prefix="osbuild-api-", dir=path)
|
|
self.var = tempfile.mkdtemp(prefix="osbuild-var-", dir=var)
|
|
self.mounts = []
|
|
self.libdir = libdir
|
|
self.runner = runner
|
|
|
|
self.mount_root(root)
|
|
self.mount_var()
|
|
|
|
def mount_root(self, root):
|
|
for p in ["boot", "usr", "bin", "sbin", "lib", "lib64"]:
|
|
source = os.path.join(root, p)
|
|
target = os.path.join(self.root, p)
|
|
if not os.path.isdir(source) or os.path.islink(source):
|
|
continue # only bind-mount real dirs
|
|
os.mkdir(target)
|
|
try:
|
|
subprocess.run(["mount", "-o", "bind,ro", source, target], check=True)
|
|
except subprocess.CalledProcessError:
|
|
self.unmount()
|
|
raise
|
|
self.mounts.append(target)
|
|
|
|
if platform.machine() == "s390x" or platform.machine() == "ppc64le":
|
|
# work around a combination of systemd not creating the link from
|
|
# /lib64 -> /usr/lib64 (see systemd issue #14311) and the dynamic
|
|
# linker is being set to (/lib/ld64.so.1 -> /lib64/ld64.so.1)
|
|
# on s390x or /lib64/ld64.so.2 on ppc64le
|
|
# Therefore we manually create the link before calling nspawn
|
|
os.symlink("/usr/lib64", f"{self.root}/lib64")
|
|
|
|
def mount_var(self):
|
|
target = os.path.join(self.root, "var")
|
|
os.mkdir(target)
|
|
try:
|
|
subprocess.run(["mount", "-o", "bind", self.var, target], check=True)
|
|
except subprocess.CalledProcessError:
|
|
self.unmount()
|
|
raise
|
|
self.mounts.append(target)
|
|
|
|
def unmount(self):
|
|
for path in self.mounts:
|
|
subprocess.run(["umount", "--lazy", path], check=True)
|
|
os.rmdir(path)
|
|
self.mounts = []
|
|
if self.root:
|
|
shutil.rmtree(self.root)
|
|
self.root = None
|
|
if self.api:
|
|
shutil.rmtree(self.api)
|
|
self.api = None
|
|
if self.var:
|
|
shutil.rmtree(self.var)
|
|
self.var = None
|
|
|
|
def run(self, argv, binds=None, readonly_binds=None):
|
|
"""Runs a command in the buildroot.
|
|
|
|
Its arguments mean the same as those for subprocess.run().
|
|
"""
|
|
|
|
nspawn_ro_binds = []
|
|
|
|
# make osbuild API-calls accessible to the container
|
|
nspawn_ro_binds.append(f"{self.api}:/run/osbuild/api")
|
|
|
|
# We want to execute our stages and other scripts in the container. So
|
|
# far, we do not install osbuild as a package in the container, but
|
|
# provide it from the outside. Therefore, we need to provide `libdir`
|
|
# via bind-mount. Furthermore, a system-installed `libdir` has the
|
|
# python packages separate in `site-packages`, so we need to bind-mount
|
|
# them as well.
|
|
# In the future, we want to work towards mandating an osbuild package to
|
|
# be installed in the container, so the build is self-contained and does
|
|
# not take scripts from the host. However, this requires osbuild
|
|
# packaged for those containers. Furthermore, we want to keep supporting
|
|
# the current import-model for testing and development.
|
|
if self.libdir is not None:
|
|
# caller-specified `libdir` must be self-contained
|
|
nspawn_ro_binds.append(f"{self.libdir}:/run/osbuild/lib")
|
|
else:
|
|
# system `libdir` requires importing the python module
|
|
nspawn_ro_binds.append("/usr/lib/osbuild:/run/osbuild/lib")
|
|
modorigin = importlib.util.find_spec("osbuild").origin
|
|
modpath = os.path.dirname(modorigin)
|
|
nspawn_ro_binds.append(f"{modpath}:/run/osbuild/lib/osbuild")
|
|
|
|
return subprocess.run([
|
|
"systemd-nspawn",
|
|
"--quiet",
|
|
"--register=no",
|
|
"--keep-unit",
|
|
"--as-pid2",
|
|
"--link-journal=no",
|
|
f"--directory={self.root}",
|
|
"--setenv=PYTHONPATH=/run/osbuild/lib",
|
|
*[f"--bind-ro={b}" for b in nspawn_ro_binds],
|
|
*[f"--bind={b}" for b in (binds or [])],
|
|
*[f"--bind-ro={b}" for b in (readonly_binds or [])],
|
|
f"/run/osbuild/lib/runners/{self.runner}"
|
|
] + argv, check=False, stdin=subprocess.DEVNULL)
|
|
|
|
def __del__(self):
|
|
self.unmount()
|
|
|
|
def __exit__(self, exc_type, exc_value, exc_tb):
|
|
self.unmount()
|