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Create disk images without root

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`mke2fs` has a `-d` option that allows to populate the newly created filesystem without needing to temporarily mount it. That allows to use `parted` and `mkfs.ext3` on regular files without needing root access.
This commit is contained in:
Eduardo Sánchez Muñoz 2023-12-28 14:04:41 +01:00
parent e6185414db
commit 5dbaeaf19b
3 changed files with 26 additions and 63 deletions
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13
lib/utils.py
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@ -37,16 +37,13 @@ def create_disk(image, disk_type, fs_type, size, bootable=False, mkfs_args=None)
if mkfs_args is None:
mkfs_args = []
run('truncate', '-s', size, image)
# First find the device we will use, then actually use it
loop_dev = run_as_root('losetup', '-f', capture_output=True).stdout.decode().strip()
run_as_root('losetup', '-P', loop_dev, image)
# Create the partition
if disk_type != "none":
run_as_root('parted', '--script', image, 'mklabel', disk_type, 'mkpart',
'primary', fs_type, '1GiB' if bootable else '1MiB', '100%')
run_as_root('partprobe', loop_dev)
run_as_root('mkfs.' + fs_type, loop_dev + "p1", *mkfs_args)
return loop_dev
# 1 GiB if bootable, 1 MiB otherwise
offset = str(1024 * 1024 * (1024 if bootable else 1))
run('parted', '--script', image, 'mklabel', disk_type, 'mkpart',
'primary', fs_type, offset + 'B', '100%')
run('mkfs.' + fs_type, image, '-E', 'offset=' + offset, *mkfs_args)
def mount(source, target, fs_type, options='', **kwargs):
"""Mount filesystem"""