[Bug 1218599] New: docker can no longer copy from inside the container

[Red Hat Bugzilla]

https://bugzilla.redhat.com/show_bug.cgi?id=1218599

Bug ID: 1218599
           Summary: docker can no longer copy from inside the container
           Product: Fedora
           Version: 21
         Component: docker-io
          Assignee: [e-mail]
          Reporter: [e-mail]
        QA Contact: [e-mail]
                CC: [e-mail], [e-mail],
                    [e-mail], [e-mail],
                    [e-mail], [e-mail],
                    [e-mail], [e-mail],
                    [e-mail], [e-mail],
                    [e-mail], [e-mail], [e-mail],
                    [e-mail]

Created attachment 1022155
  --> https://bugzilla.redhat.com/attachment.cgi?id=1022155&action=edit
dockerfile reproducer

Description of problem:
After upgrading docker I can no longer cp from inside a container. I upgraded
to docker-io-1.6.0-4.git350a636.fc21.x86_64 and tried
docker-io-1.6.0-4.git350a636.fc21.x86_64 as well. Both fail.

This is a regression in F21. That worked fine with 1.3.2

How reproducible:
Outside the container use:
docker cp my_container:/tmp/file-created-in-the-container ./tmp/
FATA[0000] Error response from daemon: Could not find the file ...

Using ssh I can verify that the files exist

Steps to Reproduce:
0. Copy the attached dockerfile into docker-dir
1. sudo docker build -t test-image docker-dir
2. sudo docker run -P --privileged=true --name xxx-name test-image
3. sudo docker cp xxx-name:/tmp/xxx /tmp/

Actual results:
With 1.3.2: nothing. The file is copied.

With 1.6.0:
FATA[0000] Error response from daemon: Could not find the file /tmp/xxx in
container xxx-name

Expected results:
The file should have been copied.

[Bug 1218599] docker can no longer copy from inside the container

[Red Hat Bugzilla]

https://bugzilla.redhat.com/show_bug.cgi?id=1218599

--- Comment #1 from Nikos Mavrogiannopoulos  ---
This is quite important to me as I base my test suite on F21 and docker, and
updating docker completely breaks my test suite.

[Bug 1218599] docker can no longer copy from inside the container

[Red Hat Bugzilla]

https://bugzilla.redhat.com/show_bug.cgi?id=1218599

Daniel Walsh  changed:

What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
                 CC|                            |[e-mail]
           Assignee|[e-mail]         |[e-mail]

--- Comment #2 from Daniel Walsh  ---
Should be fixed in docker-1.6.2.

We had made a change to mount the /tmp directory by default as a tmpfs, which
we are changing back to the default, which should allow this behavior to work
again.

We are working on a new command atomic mount which will expose the entire image
to the host, and would allow you do do much more with host commands like cp,
rsync ...

[Bug 1218599] docker can no longer copy from inside the container

[Red Hat Bugzilla]

https://bugzilla.redhat.com/show_bug.cgi?id=1218599

Daniel Walsh  changed:

What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |CLOSED
         Resolution|---                         |CURRENTRELEASE
        Last Closed|                            |2015-08-20 23:25:53