units: add systemd-debug-shell.service

If enabled, the service provides a root shell from an early boot. It also
remains active late into shutdown. It is useful for debugging startup and
shutdown problems.

This is the unit referenced in
http://freedesktop.org/wiki/Software/systemd/Debugging#early_debug_shell

diff --git a/Makefile.am b/Makefile.am
index 9ffd8c7b44e2768e9be73ba5e6324ec3093d13d1..6cc352ab91a9dd64bc5ba0e7a4b6e36b3cc69f99 100644 (file)
--- a/Makefile.am
+++ b/Makefile.am
@@ -340,7 +340,8 @@ nodist_systemunit_DATA = \
        units/user@.service \
        units/systemd-udev.service \
        units/systemd-udev-trigger.service \
-       units/systemd-udev-settle.service
+       units/systemd-udev-settle.service \
+       units/systemd-debug-shell.service
 
 dist_userunit_DATA = \
        units/user/default.target \
@@ -378,6 +379,7 @@ EXTRA_DIST += \
        units/systemd-udev.service \
        units/systemd-udev-trigger.service \
        units/systemd-udev-settle.service \
+       units/systemd-debug-shell.service.in \
        units/hibernate.service.in \
        units/suspend.service.in \
        introspect.awk \
@@ -3019,6 +3021,7 @@ SED_PROCESS = \
                -e 's,@VERSION\@,$(VERSION),g' \
                -e 's,@rootprefix\@,$(rootprefix),g' \
                -e 's,@udevlibexecdir\@,$(libexecdir)/udev,g' \
+               -e 's,@sushell\@,$(sushell),g' \
                < $< > $@ || rm $@
 
 units/%: units/%.in Makefile

diff --git a/configure.ac b/configure.ac
index c499d222fab23232c066d415fe24d00f3faa9b63..59892cb3d205dd277ed1aca9a308db7665f0183c 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -172,6 +172,12 @@ if test "x$enable_selinux" != "xno"; then
         fi
 fi
 AM_CONDITIONAL(HAVE_SELINUX, [test "$have_selinux" = "yes"])
+if test "x${have_selinux}" != xno ; then
+        sushell=/sbin/sushell
+else
+        sushell=/bin/bash
+fi
+AC_SUBST(sushell)
 
 # ------------------------------------------------------------------------------
 have_xz=no

diff --git a/units/systemd-debug-shell.service.in b/units/systemd-debug-shell.service.in
new file mode 100644 (file)
index 0000000..70c01c2
--- /dev/null
+++ b/units/systemd-debug-shell.service.in
@@ -0,0 +1,25 @@
+[Unit]
+Description=Early root shell on tty9 FOR DEBUGGING ONLY
+DefaultDependencies=no
+IgnoreOnIsolate=yes
+
+[Service]
+Environment=TERM=linux
+ExecStart=@sushell@
+Restart=always
+RestartSec=0
+StandardInput=tty
+TTYPath=/dev/tty9
+TTYReset=yes
+TTYVHangup=yes
+KillMode=process
+IgnoreSIGPIPE=no
+# bash ignores SIGTERM
+KillSignal=SIGHUP
+
+# Unset locale for the console getty since the console has problems
+# displaying some internationalized messages.
+Environment=LANG= LANGUAGE= LC_CTYPE= LC_NUMERIC= LC_TIME= LC_COLLATE= LC_MONETARY= LC_MESSAGES= LC_PAPER= LC_NAME= LC_ADDRESS= LC_TELEPHONE= LC_MEASUREMENT= LC_IDENTIFICATION=
+
+[Install]
+WantedBy=sysinit.target