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Use add_canonical_host() to implement the -h option.
Only let root specify the login host.
child_lookup() now takes an additional PATH arg, and calls
hurd_file_name_path_lookup() instead.
Pass a path when looking up the shell executable.
Do all file-name lookups using the target authentication, so that login
isn't a security hole.
Rework how password-checking is done somewhat (only ask when necessary).
Use exec_reauth() instead of our own.
If setting the real [ug]id, also add it as the `saved id'.
Use BACKUP_SHELL instead of FAILURE_SHELL define.
Get rid of various string vars only used once.
(add_canonical_host): New function.
(add_utmp_entry):
Use VIA_ADDR instead of VIA in the utmp entry if it fits better.
(add_entry): Function moved out of main.
(cat): Take an io_t port instead of a file descriptor.
(options, main):
Add -k/--keep & -S/--shell-arg options.
Remove -m/--umask option; use UMASK param instead.
(FAILURE_SHELL): Macro deleted.
(default_args): Add BACKUP_SHELL param.
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