Arch Linux

Description:
When attaching a JPG image to an issue or a merge request, Gitlab throws an HTTP 500 (internal server error). Uploading a GIF or PNG doesn't throw this error.

The cause of this is that Gitlab relies on calling a Perl binary called `exiftool`, which is a binary from the package `extra/perl-image-exiftool`. This package is not currently set as a dependency for Gitlab.

Please note that this issue also happens in Gitlab EE (enterprise edition) as well as CE (community edition).

This issue can be fixed by doing the following:

```
# pacman -S perl-image-exiftool
# ln -s /usr/bin/vendor_perl/exiftool /usr/bin/exiftool
```

I.e. putting `exiftool` in either a global path or the gitlab user's path will fix the issue. A Gitlab restart is not necessary.

Additional info:
* Occurs even in the latest version: `11.10.4-1`
* No Gitlab configuration changes required by end users, apart from the fix above
* I've also reported this issue upstream: https://gitlab.com/gitlab-org/gitlab-ce/issues/60853

Steps to reproduce:
- Create an issue or merge request
- In the message box, click the **Attach a file** link, then choose a JPG
- Observe the **Internal server error** message to the left of the link you just clicked.
- Check the Gitlab workhorse logs to view the exact error message that the exiftool binary wasn't found.