f470c3f3a3
Otherwise, sfdik would pick one at random. We want our images to be reproducible to the extent possible, so we must move all randomness out of the assemblers when we can. Signed-off-by: Tom Gundersen <teg@jklm.no>
92 lines
3.6 KiB
Python
Executable file
92 lines
3.6 KiB
Python
Executable file
#!/usr/bin/python3
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import contextlib
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import json
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import os
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import socket
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import subprocess
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import sys
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import osbuild.remoteloop as remoteloop
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@contextlib.contextmanager
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def mount(source, dest, *options):
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os.makedirs(dest, 0o755, True)
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subprocess.run(["mount", *options, source, dest], check=True)
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try:
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yield
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finally:
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subprocess.run(["umount", "-R", dest], check=True)
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@contextlib.contextmanager
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def mount_api(dest):
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with mount("/dev", f"{dest}/dev", "-o", "rbind"), \
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mount("/proc", f"{dest}/proc", "-o", "rbind"), \
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mount("/sys", f"{dest}/sys", "-o", "rbind"), \
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mount("none", f"{dest}/run", "-t", "tmpfs"):
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yield
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@contextlib.contextmanager
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def loop_device(loop_client, image, size, offset=0):
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fd = os.open(image, os.O_RDWR)
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devname = loop_client.create_device(fd, offset=offset, sizelimit=size)
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os.close(fd)
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path = f"/dev/{devname}"
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try:
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yield path
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finally:
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os.unlink(path)
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def main(tree, output_dir, options, loop_client):
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fmt = options["format"]
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filename = options["filename"]
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ptuuid = options["ptuuid"]
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root_fs_uuid = options["root_fs_uuid"]
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size = options["size"]
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# sfdisk works on sectors of 512 bytes and ignores excess space - be explicit about this
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if size % 512 != 0:
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raise ValueError("`size` must be a multiple of sector size (512)")
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if fmt not in ["raw", "qcow2", "vdi", "vmdk"]:
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raise ValueError("`format` must be one of raw, qcow, vdi, vmdk")
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image = f"/var/tmp/osbuild-image.raw"
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mountpoint = f"/tmp/osbuild-mnt"
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# Create an empty image file
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subprocess.run(["truncate", "--size", str(size), image], check=True)
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# Set up the partition table of the image
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partition_table = f"label: mbr\nlabel-id: {ptuuid}\nbootable, type=83"
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subprocess.run(["sfdisk", "-q", image], input=partition_table, encoding='utf-8', check=True)
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r = subprocess.run(["sfdisk", "--json", image], stdout=subprocess.PIPE, encoding='utf-8', check=True)
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partition_table = json.loads(r.stdout)
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partition = partition_table["partitiontable"]["partitions"][0]
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partition_offset = partition["start"] * 512
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partition_size = partition["size"] * 512
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# Populate the first partition of the image with an ext4 fs and fill it with the contents of the
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# tree we are operating on.
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subprocess.run(["mkfs.ext4", "-U", root_fs_uuid, "-E", f"offset={partition_offset}", image,
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f"{int(partition_size / 1024)}k"], input="y", encoding='utf-8', check=True)
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# Mount the created image as a loopback device
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with loop_device(loop_client, image, partition_offset) as loop_block, \
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loop_device(loop_client, image, partition_size, partition_offset) as loop_part, \
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mount(loop_part, mountpoint):
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# Copy the tree into the target image
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subprocess.run(["cp", "-a", f"{tree}/.", mountpoint], check=True)
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# Install grub2 into the boot sector of the image, and copy the grub2 imagise into /boot/grub2
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with mount_api(mountpoint):
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subprocess.run(["chroot", mountpoint, "grub2-install", "--no-floppy",
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"--modules=part_msdos", "--target=i386-pc", loop_block], check=True)
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subprocess.run(["qemu-img", "convert", "-O", fmt, "-c", image, f"{output_dir}/{filename}"], check=True)
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if __name__ == '__main__':
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args = json.load(sys.stdin)
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sock = socket.socket(socket.AF_UNIX, socket.SOCK_DGRAM)
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sock.setsockopt(socket.SOL_SOCKET, socket.SO_PASSCRED, 1)
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sock.connect("/run/osbuild/api/remoteloop")
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ret = main(args["tree"], args["output_dir"], args["options"], remoteloop.LoopClient(sock))
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sys.exit(ret)
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