particle-os/debian-forge
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

assemblers/loop_dev: take the size and optionally the offset as arguments

Browse source 
By default the whole image file is attechd to the loopback device, but
we want to only attach a slice, namely individual partitions.

This is a noop, just adds the parameters to the helpers.

Signed-off-by: Tom Gundersen <teg@jklm.no>
This commit is contained in:
Tom Gundersen 2019-06-27 19:28:30 +02:00
parent d8ff04cde6
commit 0252f42305
1 changed files with 3 additions and 3 deletions
Download patch file Download diff file Expand all files Collapse all files

6
assemblers/io.weldr.qcow2
View file

@ -35,8 +35,8 @@ def mount_api(dest):
yield
@contextlib.contextmanager
def loop_device(image):
r = subprocess.run(["losetup", "--partscan", "--show", "--find", image], stdout=subprocess.PIPE, encoding="utf-8", check=True)
def loop_device(image, size, offset=0):
r = subprocess.run(["losetup", "--partscan", "--show", "--find", "--sizelimit", str(size), "--offset", str(offset), image], stdout=subprocess.PIPE, encoding="utf-8", check=True)
loop = r.stdout.strip()
try:
yield loop
@ -63,7 +63,7 @@ def main(tree, input_dir, output_dir, options):
subprocess.run(["sfdisk", "-q", image], input=partition_table, encoding='utf-8', check=True)
# Mount the created image as a loopback device
with loop_device(image) as loop:
with loop_device(image, size) as loop:
# Populate the first partition of the image with an ext4 fs and fill it with the contents of the
# tree we are operating on.
subprocess.run(["mkfs.ext4", "-d", tree, "-U", root_fs_uuid, f"{loop}p1"], check=True)