Question

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ERROR: While executing gem … (Zlib::GzipFile::Error) not in gzip format

When installing a gem on my system, I get the following error:

gem install blackbook --version ">= 1.0.7" --source http://github.com/tamoyal/blackbook/tree/master
ERROR:  While executing gem ... (Zlib::GzipFile::Error)
    not in gzip format

Any ideas as to why this is happening? I built the gem so maybe it is something wrong with my gem build?

Thanks

Answer 1

Something isn’t set up properly to fetch the gem from GitHub.

try gem fetch -V

steve@macpro:~$ gem fetch blackbook --version ">= 1.0.7" --source http://github.com/tamoyal/blackbook/tree/master -V
GET 301 Moved Permanently: http://github.com/tamoyal/blackbook/tree/master/specs.4.8.gz
GET 200 OK: http://github.com/tamoyal/blackbook/tree/master/
ERROR:  While executing gem ... (Zlib::GzipFile::Error)
    not in gzip format

You’re getting the “not in gzip format” error because gem can’t fetch specs.4.8.gz. GitHub returns a 301 redirect back to your project home page, which of course isn’t what it wants and isn’t gzipped.

Sorry I can’t help you further, but I haven’t build a gem, much less on GitHub.