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* opts-std-startup.c (startup_options): Move -C above "Boot options:",
give it a docstring. Docstrings for --bootflags, --boot-command.
(_diskfs_boot_command): New variable.
(startup_options, parse_startup_opt): New option --boot-command,
consumes remaining args to set _diskfs_boot_command.
* priv.h: Declare _diskfs_boot_command.
* boot-start.c (diskfs_start_bootstrap): If diskfs_exec_server_task is
null, assume we are running as the boot command and have a root with
/servers/exec.
If _diskfs_boot_command is set, start that command in place of init.
If can't lookup initname, print error msg and loop to prompt.
Put a newline before "Init name" prompt.
After starting exec server, try to set active trans on /servers/exec.
(diskfs_boot_getpriv): New function: if _hurd_host_priv
is null, use fsys_getpriv on our bootstrap port.
(parent_task): New static variable, set there with fsys_getpriv call.
(diskfs_S_fsys_init): If diskfs_exec_server_task is null, don't do
anything with it; instead register parent_task as our child
and send an fsys_init to our parent on our bootstrap port.
* console.c (diskfs_console_stdio): Call diskfs_boot_privports before
get_privileged_ports if diskfs_boot_flags is set.
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