1.17 version breaks centos based images

[bear0330]

1.17 moves all s6 binaries to /bin but in CentOS based images, the directory structure is

lrwxrwxrwx.   1 root root     7 Mar 23 17:23 bin -> usr/bin
dr-xr-xr-x.   4 root root  4096 Apr 12 09:52 boot
drwxr-xr-x.  17 root root  3080 Apr 15 11:15 dev
drwxr-xr-x.  98 root root 12288 Apr 12 16:46 etc
drwxr-xr-x.   4 root root  4096 Aug 12  2015 home
lrwxrwxrwx.   1 root root     7 Mar 23 17:23 lib -> usr/lib
lrwxrwxrwx.   1 root root     9 Mar 23 17:23 lib64 -> usr/lib64
drwx------.   2 root root 16384 Jul 22  2014 lost+found
drwxr-xr-x.   2 root root  4096 Aug 12  2015 media
drwxr-xr-x.   4 root root  4096 Aug 12  2015 mnt
drwxr-xr-x.   3 root root  4096 Apr 12 09:57 opt
dr-xr-xr-x. 318 root root     0 Apr 30  2016 proc
dr-xr-x---.  10 root root  4096 Apr 12 18:54 root
drwxr-xr-x.  29 root root   920 Apr 13 03:35 run
lrwxrwxrwx.   1 root root     8 Mar 23 17:23 sbin -> usr/sbin
drwxr-xr-x.   2 root root  4096 Aug 12  2015 srv
dr-xr-xr-x.  13 root root     0 Apr 30  2016 sys
drwxrwxrwt.  22 root root  4096 Apr 15 13:04 tmp
drwxr-xr-x.  13 root root  4096 Mar 23 17:23 usr
drwxr-xr-x.  22 root root  4096 Apr 12 09:58 var

After RUN tar xzf /tmp/s6-overlay-amd64.tar.gz -C /
bin folder will not be a symbolic anymore, and /bin/sh, /bin/bash are all disappeared.

[jprjr]

One workaround: you could split extracting the tarball into two commands:

RUN tar xzf /tmp/s6-overlay-amd64.tar.gz -C / --exclude="./bin" --exclude="./sbin" && \
    tar xzf /tmp/s6-overlay-amd64.tar.gz -C /usr ./bin ./sbin

This will keep tar from overwriting symlinks.

I'll get the README updated with this workaround.

[glerchundi]

closing due to inactivity, maybe it's related to #158. lets discuss there.