bug#74400: 31.0.50; tramp-loaddefs.elc suddenly owned by root

[Eli Zaretskii <eliz@gnu.org>]

> From: Stefan Kangas <stefankangas@gmail.com>
> Date: Thu, 2 Jan 2025 15:20:11 -0600
> Cc: michael.albinus@gmx.de, michael_heerdegen@web.de, 74400@debbugs.gnu.org
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> >> From: Stefan Kangas <stefankangas@gmail.com>
> >> Date: Thu, 2 Jan 2025 14:13:31 -0600
> >> Cc: michael_heerdegen@web.de, 74400@debbugs.gnu.org
> >>
> >> Eli Zaretskii <eliz@gnu.org> writes:
> >>
> >> >> From: Michael Albinus <michael.albinus@gmx.de>
> >> >> Cc: michael_heerdegen@web.de,  74400-done@debbugs.gnu.org
> >> >> Date: Tue, 19 Nov 2024 10:09:20 +0100
> >> >>
> >> >> My example doesn't claim to be the recipe which happened to Michael. But
> >> >> it shows, that 'sudo make install' could create root-owned files in the
> >> >> build dir, and that's what this bug report is about.
> >> >>
> >> >> I don't know whether it is important enough to change something. But we
> >> >> should know (and document), that it could happen.
> >> >
> >> > If it's important enough, maybe.
> >> >
> >> > I think "make install" uses chmod to give everyone access to the file
> >> > because some files could be owned by root.  If that works, why is the
> >> > ownership important?
> >>
> >> Does everyone get write rights, though?  If not, how can you run
> >> commands like "git clean -fxd" as a regular root after "make install"?
> >
> > Sorry, I don't follow: "make install" writes to the installation
> > directory, and invokes chmod on the files installed there, whereas
> > "git clean -fxd" is run on the Git repository, which is a different
> > directory entirely.  What am I missing?
> 
> AFAIU, the issue here is that "sudo make install" can create root-owned
> files in the build directory.

That can only happen if one runs "sudo make install" before running
"make", i.e. if "make install" finds that some files in the build
directory are outdated.