<p>I was using rpmbuild to create Python RPMs based on a local tarball. I would receive this somewhat cryptic error:</p>
<p><code>error: File /home/makerpm/rpmbuild/SOURCES: Is a directory</code></p>
<p>After digging through the rpmbuild code for hints, it turned out that where py2pack (which I used for generating spec files) produced a spec file header of:</p>
<p><code>Source: https://files.pythonhosted.org/packages/source/m/mixbox/</code></p>
<p>I needed:</p>
<p><code>Source: https://files.pythonhosted.org/packages/source/m/mixbox/mixbox-%{version}.tar.gz</code></p>
<p>It was not obvious to me that the name of the tarball in fact needed to be in the external URL when I was building everything locally. I'd like to suggest a more explicit error if the version / tarball name cannot be extracted from the Source field.</p>

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