69625505cf
Rename the context class to better describe what it's doing. It doesn't run anything in a chroot, but it prepares the tree for it.
41 lines
1.5 KiB
Python
41 lines
1.5 KiB
Python
import os
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import subprocess
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class ChrootProcDevSys:
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"""
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Sets up mounts for the virtual filesystems inside a root tree, preparing it for running commands using chroot. This
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should be used whenever a stage needs to run a command against the root tree but doesn't support a --root option or
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similar.
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Cleans up mounts when done.
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This mounts /proc, /dev, and /sys.
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"""
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def __init__(self, root: str):
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self.root = root
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def __enter__(self):
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for d in ["/proc", "/dev", "/sys"]:
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if not os.path.exists(self.root + d):
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print(f"Making missing chroot directory: {d}")
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os.makedirs(self.root + d)
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subprocess.check_call(["/usr/bin/mount",
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"-t", "proc",
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"-o", "nosuid,noexec,nodev",
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"proc", f"{self.root}/proc"])
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subprocess.check_call(["/usr/bin/mount",
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"-t", "devtmpfs",
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"-o", "mode=0755,noexec,nosuid,strictatime",
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"devtmpfs", f"{self.root}/dev"])
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subprocess.check_call(["/usr/bin/mount",
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"-t", "sysfs",
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"-o", "nosuid,noexec,nodev",
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"sysfs", f"{self.root}/sys"])
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return self
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def __exit__(self, exc_type, exc_value, tracebk):
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for d in ["/proc", "/dev", "/sys"]:
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subprocess.check_call(["/usr/bin/umount", self.root + d])
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