bug#48137: 27.2; `package-install-file' fails when loading a package file with DOS line endings

[Eli Zaretskii]

> From: Ioannis Kappas <ioannis.kappas@gmail.com>
> Date: Wed, 5 May 2021 08:03:17 +0100
> Cc: Stefan Monnier <monnier@iro.umontreal.ca>, 48137@debbugs.gnu.org
> 
> Currently, `package-install-file' reads the package contents into a
> buffer and calls `package-install-from-buffer' to parse the headers,
> download & install its dependencies, and finally install the package
> itself from the buffer.
> 
> Just to confirm, what we are discussing as a solution (at a high
> level) is to parse the package headers from a decoded buffer, download
> & install its dependencies, and copy/extract the package file to the
> elpa user dir?

My idea was to read the file literally, without decoding, then parse
the package headers from that.  Stefan seems to think it's
non-trivial, which makes me suspect that I'm missing something.