1 files changed, 155 insertions, 0 deletions
diff --git a/daemons/runsystem.hurd.sh b/daemons/runsystem.hurd.sh
new file mode 100644
index 00000000..f4f27711
--- /dev/null
+++ b/daemons/runsystem.hurd.sh
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+#!/bin/bash
+#
+# This program is run by /hurd/init at boot time after the essential
+# servers are up, and is responsible for running the "userland" parts of a
+# normal system.  This includes running the single-user shell as well as a
+# multi-user system.  This program is expected never to exit.
+#
+
+
+###
+### Where to find programs, etc.
+###
+
+PATH=/bin:/sbin
+export PATH
+
+umask 022
+
+# If we lose badly, try to exec each of these in turn.
+fallback_shells='/bin/sh /bin/bash /bin/csh /bin/ash /bin/shd'
+
+# Shell used for normal single-user startup.
+SHELL=/bin/sh
+
+# Programs that do multi-user startup.
+RUNCOM=/libexec/rc
+RUNTTYS=/libexec/runttys
+# Signals that we should pass down to runttys.
+runttys_sigs='TERM INT HUP TSTP'
+
+###
+
+
+# If we get a SIGLOST, attempt to reopen the console in case
+# our console ports were revoked.  This lets us print messages.
+function reopen_console ()
+{
+  exec 1>/dev/console 2>&1 || exit 3
+}
+trap 'reopen_console' SIGLOST
+
+
+# Call this when we are losing badly enough that we want to punt normal
+# startup entirely.  We exec a single-user shell, so we will not come back
+# here.  The only way to get to multi-user from that shell will be
+# explicitly exec this script or something like that.
+function singleuser ()
+{
+  test $# -eq 0 || echo "$0: $*"
+  for try in ${fallback_shells}; do
+    SHELL=${try}
+    exec ${SHELL}
+  done
+  exit 127
+}
+
+
+# See whether pflocal is set up already, and do so if not (install case)
+#
+# Normally this should be the case, but we better make sure since
+# without the pflocal server, pipe(2) does not work.
+if ! test -e /servers/socket/1 ; then
+  # The root filesystem should be read-only at this point.
+  if fsysopts / --update --writable ; then
+    settrans -c /servers/socket/1 /hurd/pflocal
+  else
+    singleuser "Failed to create /servers/socket/1."
+  fi
+fi
+
+# We expect to be started by console-run, which gives us no arguments and
+# puts FALLBACK_CONSOLE=file-name in the environment if our console is
+# other than a normal /dev/console.
+
+if [ "${FALLBACK_CONSOLE+set}" = set ]; then
+  singleuser "Running on fallback console ${FALLBACK_CONSOLE}"
+fi
+
+
+###
+### Normal startup procedures
+###
+
+# Parse the multiboot command line.  We only pay attention to -s and -f.
+# The first argument is the kernel file name; skip that.
+shift
+flags=
+while [ $# -gt 0 ]; do
+  arg="$1"
+  shift
+  case "$arg" in
+  --*) ;;
+  *=*) ;;
+  -*)
+    flags="${flags}${arg#-}"
+    ;;
+  'single'|'emergency') # Linux compat
+    flags="${flags}s"
+    ;;
+  'fastboot')
+    flags="${flags}f"
+    ;;
+  esac
+done
+
+# Check boot flags.
+case "$flags" in
+*s*)
+  rc=false			# force single-user
+  ;;
+*f*)
+  rc="${RUNCOM}"		# fastboot
+  ;;
+*)
+  rc="${RUNCOM} autoboot"	# multi-user default
+  ;;
+esac
+
+# Large infinite loop.  If this script ever exits, init considers that
+# a serious bogosity and punts to a fallback single-user shell.
+# We handle here the normal transitions between single-user and multi-user.
+while : ; do
+
+  # Run the rc script.  As long as it exits nonzero, punt to single-user.
+  # After the single-user shell exits, we will start over attempting to
+  # run rc; but later invocations strip the `autoboot' argument.
+  until $rc; do
+    rc=${RUNCOM}
+
+    # Run single-user shell and repeat as long as it dies with a signal.
+    until ${SHELL} || test $? -lt 128; do
+      :
+    done
+  done
+
+  # Now we are officially ready for normal multi-user operation.
+
+  # Trap certain signals and send them on to runttys.  For this to work, we
+  # must run it asynchronously and wait for it with the `wait' built-in.
+  runttys_pid=0
+  for sig in $runttys_sigs; do
+    trap "kill -$sig \${runttys_pid}" $sig
+  done
+
+  # This program reads /etc/ttys and starts the programs it says to.
+  ${RUNTTYS} &
+  runttys_pid=$!
+
+  # Wait for runttys to die, meanwhile handling trapped signals.
+  wait
+
+  # Go back to the top of the infinite loop, as if booting single-user.
+  rc=false
+
+done