Cannot change ownership of read-only file in mounted volume

[sameersbn]

Expected behavior

Ownership of file should change.

Actual behavior

Permission denied error displayed by chown command

Information

Diagnostic ID: C6AC4F0F-8770-4592-8AB1-E34D52436EEF
Docker for Mac: 1.12.0-a (Build 11213)
macOS: Version 10.11.6 (Build 15G1004)
[OK] docker-cli
[OK] app
[OK] moby-syslog
[OK] disk
[OK] virtualization
[OK] system
[OK] menubar
[OK] osxfs
[OK] db
[OK] slirp
[OK] moby-console
[OK] logs
[OK] vmnetd
[OK] env
[OK] moby
[OK] driver.amd64-linux

Steps to reproduce

$ mkdir -p sandbox && cd sandbox
$ docker run -it --rm -v $PWD:/data --workdir /data ubuntu:14.04 bash
$ touch sample && chmod 444 sample && ls -la
total 5
drwxr-xr-x  3 root root  102 Sep 15 12:28 .
drwxr-xr-x 35 root root 4096 Sep 15 12:27 ..
-r--r--r--  1 root root    0 Sep 15 12:28 sample
$ chown daemon:daemon sample
chown: changing ownership of 'sample': Permission denied

The ownership of the file can however be changed by first changing the mode to readwrite mode:

$ chmod 755 sample
$ chown daemon:daemon sample
$ ls -la sample
total 5
drwxr-xr-x  3 root   root    102 Sep 15 12:51 .
drwxr-xr-x 35 root   root   4096 Sep 15 12:51 ..
-rwxr-xr-x  1 daemon daemon    0 Sep 15 12:51 sample

[dsheets]

This is a (clearer) duplicate of #117 and #263. Thanks for the report. We hope to have a fix out soon.

[jakajancar]

@dsheets Can you explain what the fix will be? Will you just start saving permissions in OS X extended attributes, or is it going to also remove (uid/gid = current uid/gid)?

[jakajancar]

Anything new here?

[dsheets]

This should be fixed in the just-released Beta 29. Sorry for the delay in resolving the issue -- we had a couple of false starts on the design but now we use an ACL entry to make xattrs (containing ownership metadata) behave like inode metadata in most circumstances. Please give it a try and let us know how it works (or doesn't) for you. I'm going to close this issue but if you find related problems, please feel free to re-open. If you find un-related problems, please open a new issue. :-)

Thanks for using Docker for Mac!

[docker-robott]

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