Github user haosdent commented on the issue:
https://github.com/apache/mesos/pull/153
OK, I think I find the root cause.
```
$ stat test/gmock-port_test.cc
File: 'test/gmock-port_test.cc'
Size: 2020 Blocks: 4 IO Block: 512 regular file
Device: 28h/40d Inode: 37331162 Links: 1
Access: (0444/-r--r--r--) Uid: ( 0/ root) Gid: ( 0/ root)
Access: 1970-01-01 00:00:00.000000000 +0000
Modify: 2013-09-18 17:50:15.000000000 +0000
Change: 2016-08-14 04:06:55.000000000 +0000
Birth: -
```
```
$ stat ./.git/objects/pack/pack-4ad0e5887c21e2edcca6e6b0af3851568bbee729.idx
File:
'./.git/objects/pack/pack-4ad0e5887c21e2edcca6e6b0af3851568bbee729.idx'
Size: 144180 Blocks: 282 IO Block: 512 regular file
Device: 28h/40d Inode: 37330833 Links: 1
Access: (0444/-r--r--r--) Uid: ( 0/ root) Gid: ( 0/ root)
Access: 2016-08-14 04:08:46.000000000 +0000
Modify: 2016-04-19 21:45:36.000000000 +0000
Change: 2016-08-14 04:06:51.000000000 +0000
Birth: -
```
Those files are `-r--r--r--`, which don't allow to write. ð Docker is
correct.
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