[Bug 15481] /bin/sh does not work when invoked with argv[0] different from "sh"

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=15481

--- Comment #1 from Eric Blake <eblake at redhat.com> ---
In parallel, I've opened https://www.austingroupbugs.net/view.php?id=1645;
maybe POSIX will be relaxed to allow libc implementations to fall back to
execl("/bin/sh", "sh", "-c", ". quoted_file", argv[0], argv[1], ..., NULL) or
execl("/bin/sh", "sh", "-c", "exec -a \"$0\" quoted_file \"$@\"", argv[0],
argv[1], ..., NULL), at which point busybox can still depend on argv[0] ending
in "sh" while passing the correct $0 to the shell script.  Let's see what the
libc and POSIX folks say...

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