bug#53644: 29.0.50; xref-search-program breaks if programm not installed on a remote host

[Michael Albinus]

Philip Kaludercic <philipk@posteo.net> writes:

Hi Philip,

> But the question here remains precisely what to use instead of the
> literal "/bin/sh"?

Well, if there isn't a better value, "/bin/sh" should serve as
fallback. In my experience with Tramp, it works on most of the remote
systems. It doesn't work on remote Android devices, for example. But the
number of Emacs < 27 users, running xref-* on a remote Android device,
is rather limited I believe.

POSIX declines this assumptions. It recommends to call "command -v sh"
in order to determine the shell path, see
<https://pubs.opengroup.org/onlinepubs/9699919799/utilities/sh.html>.

Best regards, Michael.