cb265e8b58
Runner are invoked to prepare the execution of stages and assemblers inside the container. The setup tasks are specific to the distribution and maybe the version of it, therefore specific runners are used for each distribution+version combination. The build the first (most nested) build root, `/usr` is taken from the host to bootstrap the container. On RHEL, the python interpreter to be used for software that belongs to the platform is platform-python, as it provides a stable API. Therefore the RHEL runners should use that instead of relying on the presence of /usr/bin/python3.6, which might not be installed and is indeed not installed by default.
71 lines
2 KiB
Text
Executable file
71 lines
2 KiB
Text
Executable file
#!/usr/libexec/platform-python
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import os
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import subprocess
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import sys
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from osbuild.util import jsoncomm
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def ldconfig():
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# ld.so.conf must exist, or `ldconfig` throws a warning
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subprocess.run(["touch", "/etc/ld.so.conf"], check=True)
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subprocess.run(["ldconfig"], check=True)
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def sysusers():
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try:
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subprocess.run(["systemd-sysusers"], stdout=subprocess.PIPE, stderr=subprocess.STDOUT, check=True)
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except subprocess.CalledProcessError as error:
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sys.stderr.write(error.stdout)
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sys.exit(1)
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def tmpfiles():
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# Allow systemd-tmpfiles to return non-0. Some packages want to create
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# directories owned by users that are not set up with systemd-sysusers.
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subprocess.run(["systemd-tmpfiles", "--create"], check=False)
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def nsswitch():
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# the default behavior is fine, but using nss-resolve does not
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# necessarily work in a non-booted container, so make sure that
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# is not configured.
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try:
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os.remove("/etc/nsswitch.conf")
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except FileNotFoundError:
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pass
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def setup_stdio():
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with jsoncomm.Socket.new_client("/run/osbuild/api/osbuild") as client:
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req = {'method': 'setup-stdio'}
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client.send(req)
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msg, fds, _ = client.recv()
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for io in ['stdin', 'stdout', 'stderr']:
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target = getattr(sys, io)
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source = fds[msg[io]]
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os.dup2(source, target.fileno())
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fds.close()
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def python_alternatives():
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"""/usr/bin/python3 is a symlink to /etc/alternatives/python3, which points
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to /usr/bin/python3.6 by default. Recreate the link in /etc, so that
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shebang lines in stages and assemblers work.
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"""
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os.makedirs("/etc/alternatives", exist_ok=True)
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try:
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os.symlink("/usr/bin/python3.6", "/etc/alternatives/python3")
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except FileExistsError:
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pass
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if __name__ == "__main__":
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setup_stdio()
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ldconfig()
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sysusers()
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tmpfiles()
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nsswitch()
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python_alternatives()
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r = subprocess.run(sys.argv[1:], check=False)
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sys.exit(r.returncode)
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