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This patch adds a minimalist init program. It is somewhat lacking in
features, but is able to bring up a Hurd system with the runsystem and
rc scripts. In fact, it roughly does what the former /hurd/init did,
modulo all the very early bootstrapping stuff and the startup
protocol. It is started when all the essential servers are up and
running, so it can make use of most of the POSIX goodies, making its
implementation much simpler.
* Makefile (prog-subdirs): Add init.
* daemons/runsystem.sh: Generalize runsystem so that it can start any
init as specified on the kernel command line. By default, it starts
/hurd/init.
* daemons/runsystem.hurd: This is a verbatim copy of runsystem.sh. It
is started by /hurd/init.
* daemons/rc.sh: Do not start /hurd/mach-defpager as it is already
started in runsystem.sh.
* daemons/Makefile (SRCS): Add runsystem.hurd.
* init/Makefile: New file.
* init/init.c: Likewise.
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runsystem.sh checks whether /servers/socket/1 exists and creates it
using settrans -c if it does not. But at this point in the boot the
root filesystem is normally not writable. This patch fixes this.
* daemons/runsystem.sh: Make sure / is writable before attempting to
set up pflocal.
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Needed early for shell pipelines.
* daemons/runsystem.sh: See whether pflocal is setup already, and do so if
not (install case)
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* daemons/runsystem.sh: Call umask 022.
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* runsystem.sh: For now, this requires bash.
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* runsystem.sh: Don't check for MULTIBOOT_CMDLINE environment variable.
Instead, expect it as normal arguments from init.
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* runsystem.sh: New file.
* Makefile (targets, special-targets): Add runsystem.
(runsystem): New target.
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