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WIP: install: rootless disk image

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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>
This commit is contained in:
Casey Connolly 2025-05-08 17:23:32 +02:00
parent 393f7e3616
commit 18d912d53d
19 changed files with 543 additions and 480 deletions
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12
pmb/helpers/args.py
View file

@ -93,6 +93,18 @@ def init(args: PmbArgs) -> PmbArgs:
pmb.helpers.logging.init(context.log, args.verbose, context.details_to_stdout)
pmb.helpers.logging.debug(f"Pmbootstrap v{pmb.__version__} (Python {sys.version})")
# Now we go round-about to set context based on deviceinfo hahaha
if args.action != "config":
context.sector_size = context.sector_size or pmb.parse.deviceinfo().rootfs_image_sector_size
if context.sector_size is None:
context.sector_size = 512
valid_sector_size = [512, 2048, 4096]
if context.sector_size not in valid_sector_size:
raise ValueError(
f"Invalid sector size from cmdline or deviceinfo file! Must be one of {valid_sector_size} but got {context.sector_size}"
)
# Initialization code which may raise errors
if args.action not in [
"init",