alt Hacker NewsGoogle are absolutely within the letter of the GPL, pedantically so. But maybe not the sprit.
We didn't have git tags when GPL was written in 1989, and while we did have sccs and rcs, (and early versions of cvs) they just weren't that widely used, and generally not used for distribution.
Even when GPL 3.0 was written in 2005-2007, source tarballs were still the primary form of distribution, even though it was starting to become standard to additionally provide anonymous cvs, svn, or one of the brand new distributed systems like git.
But these days git is the primary form of distribution, and source tarballs are noting more an afterthought. Hell, even tags are a bit of an afterthought on many projects. It's basically become the norm to expect an healthy revision history for any open source code.
Based on it's stated goals of "freedom to modify the software you use", IMO if the GPL was written (or updated) today, it would most likely require the distribution of revision history and restrict how much that history can be squashed/rewritten.
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GPL says we need to be provided with the preferred form for modification. Those are the Git repositories for Android source code.
For Pixel kernel drivers, Google is converting the source code from the preferred form of dozens of Git repositories to a massive monolithic tarball. The build system used for this code expects it to be a bunch of Git repositories and spews out errors without it. It does build the code but it isn't the build process they used to do it themselves which is non-compliance. We need to be provided with what is needed to build it in the same way they built it.
> We didn't have git tags when GPL was written in 1989
The GPLv2 requires "a medium customarily used for software interchange", not "a medium customarily used in 1989 for software interchange". Customs are the customs of the time someone is releasing the work.