Hgfs is a file system that VMware fusion uses to mount a host file system
from OS X onto the guest...

On Friday, October 28, 2016, Steve Langasek <email address hidden>
wrote:

> Hi David,
>
> Thanks for the bug report.  So, 'cp -p' should only fail if the target
> filesystem is not a POSIX filesystem.  Is that the case for you?  I see
> /home/cro/home_root/mnt/hgfs/cro/Documents/TanagerProjects/
> Signage/flock_installer
> /ics-ubuntu-image.img as a destination, I'm not sure if 'hgfs' refers to
> a particular filesystem with non-POSIX semantics?
>
> This is certainly a legitimate bug.  We may be able to drop the '-p'
> with the reasoning that a file copy will create the new file with the
> same umask and owner as the original file creation, but we need to check
> this assumption.
>
> ** Changed in: ubuntu-image
>        Status: New => Triaged
>
> ** Changed in: ubuntu-image
>    Importance: Undecided => Medium
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1637554
>
> Title:
>   "Invalid cross-device link" and failed to preserve ownership error on
>   image-output...
>
> Status in Ubuntu Image:
>   Triaged
>
> Bug description:
>   Here is your wall of traceback:
>
>   cro@ubuntu:~$ sudo /snap/bin/ubuntu-image \
>   >      --extra-snaps=/home/cro/home_root/mnt/2/snapcraft_kernel_
> build_test/linuxium-kernel_4.4.0-45.66_amd64.snap \
>   >      -c beta -o ${DIR2_}/ics-ubuntu-image.img \
>   >      ${DIR4_}/ics.model
>   Fetching core
>   Copying "/home/cro/home_root/mnt/2/snapcraft_kernel_build_test/
> linuxium-kernel_4.4.0-45.66_amd64.snap" (linuxium-kernel)
>   Fetching pc
>   linuxium-kernel already prepared, skipping
>   COMMAND FAILED: ['cp', '-p', '--sparse=always',
> '/tmp/tmpsjo_rg8t/.images/disk.img', '/home/cro/home_root/mnt/hgfs/
> cro/Documents/TanagerProjects/Signage/flock_installer/ics-
> ubuntu-image.img']
>   cp: failed to preserve ownership for '/home/cro/home_root/mnt/hgfs/
> cro/Documents/TanagerProjects/Signage/flock_installer/ics-ubuntu-image.img':
> Operation not permitted
>   uncaught exception in state machine step: [11] finish
>   Traceback (most recent call last):
>     File "/snap/ubuntu-image/25/usr/lib/python3.5/shutil.py", line 538,
> in move
>       os.rename(src, real_dst)
>   OSError: [Errno 18] Invalid cross-device link: '/tmp/tmpsjo_rg8t/.images/disk.img'
> -> '/home/cro/home_root/mnt/hgfs/cro/Documents/TanagerProjects/
> Signage/flock_installer/ics-ubuntu-image.img'
>
>   During handling of the above exception, another exception occurred:
>
>   Traceback (most recent call last):
>     File "/snap/ubuntu-image/25/lib/python3.5/site-packages/ubuntu_image/state.py",
> line 68, in __next__
>       step()
>     File "/snap/ubuntu-image/25/lib/python3.5/site-packages/ubuntu_image/builder.py",
> line 430, in finish
>       shutil.move(self.disk_img, self.output, copy_function=sparse_copy)
>     File "/snap/ubuntu-image/25/usr/lib/python3.5/shutil.py", line 552,
> in move
>       copy_function(src, real_dst)
>     File "/snap/ubuntu-image/25/lib/python3.5/site-packages/ubuntu_image/helpers.py",
> line 142, in sparse_copy
>       run(args)
>     File "/snap/ubuntu-image/25/lib/python3.5/site-packages/ubuntu_image/helpers.py",
> line 120, in run
>       proc.check_returncode()
>     File "/snap/ubuntu-image/25/usr/lib/python3.5/subprocess.py", line
> 659, in check_returncode
>       self.stderr)
>   subprocess.CalledProcessError: Command '['cp', '-p', '--sparse=always',
> '/tmp/tmpsjo_rg8t/.images/disk.img', '/home/cro/home_root/mnt/hgfs/
> cro/Documents/TanagerProjects/Signage/flock_installer/ics-ubuntu-image.img']'
> returned non-zero exit status 1
>   Crash in state machine
>   Traceback (most recent call last):
>     File "/snap/ubuntu-image/25/usr/lib/python3.5/shutil.py", line 538,
> in move
>       os.rename(src, real_dst)
>   OSError: [Errno 18] Invalid cross-device link: '/tmp/tmpsjo_rg8t/.images/disk.img'
> -> '/home/cro/home_root/mnt/hgfs/cro/Documents/TanagerProjects/
> Signage/flock_installer/ics-ubuntu-image.img'
>
>   During handling of the above exception, another exception occurred:
>
>   Traceback (most recent call last):
>     File "/snap/ubuntu-image/25/lib/python3.5/site-packages/ubuntu_image/__main__.py",
> line 171, in main
>       list(state_machine)
>     File "/snap/ubuntu-image/25/lib/python3.5/site-packages/ubuntu_image/state.py",
> line 68, in __next__
>       step()
>     File "/snap/ubuntu-image/25/lib/python3.5/site-packages/ubuntu_image/builder.py",
> line 430, in finish
>       shutil.move(self.disk_img, self.output, copy_function=sparse_copy)
>     File "/snap/ubuntu-image/25/usr/lib/python3.5/shutil.py", line 552,
> in move
>       copy_function(src, real_dst)
>     File "/snap/ubuntu-image/25/lib/python3.5/site-packages/ubuntu_image/helpers.py",
> line 142, in sparse_copy
>       run(args)
>     File "/snap/ubuntu-image/25/lib/python3.5/site-packages/ubuntu_image/helpers.py",
> line 120, in run
>       proc.check_returncode()
>     File "/snap/ubuntu-image/25/usr/lib/python3.5/subprocess.py", line
> 659, in check_returncode
>       self.stderr)
>   subprocess.CalledProcessError: Command '['cp', '-p', '--sparse=always',
> '/tmp/tmpsjo_rg8t/.images/disk.img', '/home/cro/home_root/mnt/hgfs/
> cro/Documents/TanagerProjects/Signage/flock_installer/ics-ubuntu-image.img']'
> returned non-zero exit status 1
>
>
>   This fix worked for me:
>
>   cro@ubuntu:~$ diff /tmp/helpers.py /snap/ubuntu-image/25/lib/
> python3.5/site-packages/ubuntu_image/helpers.py
>   139c139
>   <     args = ['cp', '--sparse=always', src, dst]
>   ---
>   >     args = ['cp', '-p', '--sparse=always', src, dst]
>
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>