Agent has trouble handling some formats of .tar.gz files

[soenkeliebau]

One of our customers provided an internal mirror of our packages repository and they used a tool for mirroring this which extracts, scans and then rezips all mirrored files.

With the resulting files the agent couldn't unpack the contents and just ran into "invalid gzip header" issues that cause installation of the package to fail.

I'll try to obtain a file that causes this behavior from the customer and attach to this issue.