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Ichimonji10 
Make reset_squid() work with Squid version 4

Function `pulp_smash.utils.reset_squid` stops squid, deletes and
recreates its cache, and starts squid. As part of the cache recreation
process, it executes the following command: [1]

    squid -z

This works in most cases. However, if all of the following are true...

* The command is executed over SSH.
* The remote system has SELinux enabled.
* Squid version 4 is installed.

...then the command will leave stray files in `/dev/shm/`. These files
will have SELinux contexts set in such a way that Squid is unable to
touch them, and as a result, Squid will be unable to successfully start.

For whatever reason, a solution is to use the `--foreground` flag:

    squid -z --foreground

This flag was introduced in Squid 4: [2]

> The squid binary now has a new --foreground command line option which
> prevents the process from exiting early while background workers
> continue their processing. When run with this option Squid will now
> wait for the worker(s) to finish before exiting. Unlike the old -N
> option --foreground supports SMP workers and multi-process features.
> --foreground is particularly useful for use with -z (disk cache
> structures creation), as it allows the caller to wait until Squid has
> finished.

Thus, if Squid 4 or newer is installed, the `--foreground` command is
appended to the cache-recreation command.

[1] `sudo` is prepended if appropriate.
[2] http://www.squid-cache.org/Versions/v4/RELEASENOTES.html

379 of 601 relevant lines covered (63.06%)

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Jobs
ID Job ID Ran Files Coverage
1 1314.1 0
63.06
 Travis Job 1314.1
2 1314.2 0
63.06
 Travis Job 1314.2
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