mirror of
https://gitlab.postmarketos.org/postmarketOS/pmbootstrap.git
synced 2025-07-23 12:35:12 +03:00
18d912d53d
Refactor the install code to stop using loop devices and instead create and manipulate a disk image directly. Both ext4 and vfat have mechanisms for formatting and populating partitions at an offset inside an image, other filesystems likely do as well but so far have not been implemented or tested. With this "pmbootstrap install" works for standard EFI disk images (e.g. QEMU, X64 or trailblazer) entirely rootless. Since the creation of the disk images happens in the same user namespace as everything else, the resulting disk images have correct ownership and permissions even though from the host perspective they are all subuids. This gets image building working properly *for the default case*. We can now build disk images! In particular, we can build disk images with a 4k sector size even on a host with a 512 byte sector size (or block size in the filesystem). This is surprisingly hard for some reason since not all libfdisk tools have the right flags. Thankfully sfdisk does. In addition, we now generate UUIDs ourselves, to break the loop between generating fstab and running mkfs (since we also populate the disk image /with/ mkfs, we need to already know the UUID when we run it...). Signed-off-by: Casey Connolly <kcxt@postmarketos.org>
96 lines
3.3 KiB
Python
96 lines
3.3 KiB
Python
# Copyright 2023 Oliver Smith
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# SPDX-License-Identifier: GPL-3.0-or-later
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from pmb.core.pkgrepo import pkgrepo_default_path
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from pmb.helpers import logging
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import os
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from pathlib import Path
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import pmb.chroot.binfmt
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import pmb.config
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import pmb.helpers.run
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import pmb.helpers.mount
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from pmb.core import Chroot
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from pmb.core.context import get_context
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from pmb.init import sandbox
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def mount_dev_tmpfs(chroot: Chroot = Chroot.native()) -> None:
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"""
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Mount tmpfs inside the chroot's dev folder to make sure we can create
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device nodes, even if the filesystem of the work folder does not support
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it.
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"""
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# Do nothing when it is already mounted
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# dev = chroot / "dev"
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# if pmb.helpers.mount.ismount(dev):
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# return
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logging.info(f"mount_dev_tmpfs({chroot})")
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# Use sandbox to set up /dev inside the chroot
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ttyname = os.ttyname(2) if os.isatty(2) else ""
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devop = sandbox.DevOperation(ttyname, "/dev")
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devop.execute("/", str(chroot.path))
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def mount(chroot: Chroot):
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# Mount tmpfs as the chroot's /dev
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chroot.path.mkdir(exist_ok=True)
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mount_dev_tmpfs(chroot)
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# Get all mountpoints
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arch = chroot.arch
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channel = pmb.config.pmaports.read_config(pkgrepo_default_path())["channel"]
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mountpoints: dict[Path, Path] = {}
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for src_template, target_template in pmb.config.chroot_mount_bind.items():
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src_template = src_template.replace("$WORK", os.fspath(get_context().config.work))
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src_template = src_template.replace("$ARCH", str(arch))
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src_template = src_template.replace("$CHANNEL", channel)
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mountpoints[Path(src_template).resolve()] = Path(target_template)
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# Mount if necessary
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for source, target in mountpoints.items():
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target_outer = chroot / target
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if not pmb.helpers.mount.ismount(target_outer):
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pmb.helpers.mount.bind(source, target_outer)
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# Set up binfmt
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if not arch.cpu_emulation_required():
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return
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arch_qemu = arch.qemu()
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# mount --bind the qemu-user binary
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pmb.chroot.binfmt.register(arch)
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pmb.helpers.mount.bind_file(
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Chroot.native() / f"usr/bin/qemu-{arch_qemu}",
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chroot / f"usr/bin/qemu-{arch_qemu}-static",
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create_folders=True,
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)
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def mount_native_into_foreign(chroot: Chroot) -> None:
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source = Chroot.native().path
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target = chroot / "native"
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pmb.helpers.mount.bind(source, target)
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musl = next(source.glob("lib/ld-musl-*.so.1")).name
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musl_link = chroot / "lib" / musl
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if not musl_link.is_symlink():
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pmb.helpers.run.root(["ln", "-s", "/native/lib/" + musl, musl_link])
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# pmb.helpers.run.root(["ln", "-sf", "/native/usr/bin/pigz", "/usr/local/bin/pigz"])
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def remove_mnt_pmbootstrap(chroot: Chroot) -> None:
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"""Safely remove /mnt/pmbootstrap directories from the chroot, without
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running rm -r as root and potentially removing data inside the
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mountpoint in case it was still mounted (bug in pmbootstrap, or user
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ran pmbootstrap 2x in parallel). This is similar to running 'rm -r -d',
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but we don't assume that the host's rm has the -d flag (busybox does
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not)."""
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mnt_dir = chroot / "mnt/pmbootstrap"
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if not mnt_dir.exists():
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return
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for path in [*mnt_dir.glob("*"), mnt_dir]:
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pmb.helpers.run.root(["rmdir", path])
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