Introduce kdump capture service

This patch introduce a new kdump-capture.service which is used to run
kdump.sh.

kdump-capture.service has OnFailure=emergency.target and
OnFailureIsolate=yes set. When kdump.sh fails, the kdump emergency
service will be triggered and enter the error handling path.

In 2nd kernel, the default target for systemd is initrd.target, so we
put kdump-capture.service in initrd.target.wants/ and by that, system
will start kdump-capture as part of the boot process.

kdump.sh used to run in dracut-pre-pivot hook. Now kdump-capture.service
is placed after dracut-pre-pivot.service and other dependencies are all
copied from dracut-pre-pivot.service. So the start point of
kdump.sh will be almost the same as it used to be.

Signed-off-by: WANG Chao <chaowang@redhat.com>
Acked-by: Vivek Goyal <vgoyal@redhat.com>
Acked-by: Dave Young <dyoung@redhat.com>

dracut-kdump-capture.service

@@ -0,0 +1,30 @@
+#  This file is part of systemd.
+#
+#  systemd is free software; you can redistribute it and/or modify it
+#  under the terms of the GNU Lesser General Public License as published by
+#  the Free Software Foundation; either version 2.1 of the License, or
+#  (at your option) any later version.
+
+[Unit]
+Description=Kdump Vmcore Save Service
+After=initrd.target initrd-parse-etc.service sysroot.mount
+After=dracut-initqueue.service dracut-pre-mount.service dracut-mount.service dracut-pre-pivot.service
+Before=initrd-cleanup.service
+ConditionPathExists=/etc/initrd-release
+OnFailure=emergency.target
+OnFailureIsolate=yes
+
+[Service]
+Environment=DRACUT_SYSTEMD=1
+Environment=NEWROOT=/sysroot
+Type=oneshot
+ExecStart=/bin/kdump.sh
+StandardInput=null
+StandardOutput=syslog
+StandardError=syslog+console
+KillMode=process
+RemainAfterExit=yes
+
+# Bash ignores SIGTERM, so we send SIGHUP instead, to ensure that bash
+# terminates cleanly.
+KillSignal=SIGHUP

dracut-kdump.sh

@@ -179,8 +179,7 @@ fi
 get_host_ip
 if [ $? -ne 0 ]; then
     echo "kdump: get_host_ip exited with non-zero status!"
-    do_default_action
-    do_final_action
+    exit 1
 fi
 
 if [ -z "$DUMP_INSTRUCTION" ]; then
@@ -202,7 +201,7 @@ if [ $? -ne 0 ]; then
 fi
 
 if [ $DUMP_RETVAL -ne 0 ]; then
-    do_default_action
+    exit 1
 fi
 
 do_final_action

dracut-module-setup.sh

@@ -577,9 +577,11 @@ install() {
     inst "/bin/cut" "/bin/cut"
     inst "/sbin/makedumpfile" "/sbin/makedumpfile"
     inst "/sbin/vmcore-dmesg" "/sbin/vmcore-dmesg"
-    inst_hook pre-pivot 9999 "$moddir/kdump.sh"
     inst "/lib/kdump/kdump-lib.sh" "/lib/kdump-lib.sh"
     inst "/lib/kdump/kdump-lib-initramfs.sh" "/lib/kdump-lib-initramfs.sh"
+    inst "$moddir/kdump.sh" "/usr/bin/kdump.sh"
+    inst "$moddir/kdump-capture.service" "$systemdsystemunitdir/kdump-capture.service"
+    ln_r "$systemdsystemunitdir/kdump-capture.service" "$systemdsystemunitdir/initrd.target.wants/kdump-capture.service"
     inst "$moddir/kdump-error-handler.sh" "/usr/bin/kdump-error-handler.sh"
     inst "$moddir/kdump-error-handler.service" "$systemdsystemunitdir/kdump-error-handler.service"
     # Replace existing emergency service

kexec-tools.spec

@@ -39,6 +39,7 @@ Source102: dracut-monitor_dd_progress
 Source103: dracut-kdump-error-handler.sh
 Source104: dracut-kdump-emergency.service
 Source105: dracut-kdump-error-handler.service
+Source106: dracut-kdump-capture.service
 
 Requires(post): systemd-units
 Requires(preun): systemd-units
@@ -216,6 +217,7 @@ cp %{SOURCE102} $RPM_BUILD_ROOT/etc/kdump-adv-conf/kdump_dracut_modules/99kdumpb
 cp %{SOURCE103} $RPM_BUILD_ROOT/etc/kdump-adv-conf/kdump_dracut_modules/99kdumpbase/%{remove_dracut_prefix %{SOURCE103}}
 cp %{SOURCE104} $RPM_BUILD_ROOT/etc/kdump-adv-conf/kdump_dracut_modules/99kdumpbase/%{remove_dracut_prefix %{SOURCE104}}
 cp %{SOURCE105} $RPM_BUILD_ROOT/etc/kdump-adv-conf/kdump_dracut_modules/99kdumpbase/%{remove_dracut_prefix %{SOURCE105}}
+cp %{SOURCE106} $RPM_BUILD_ROOT/etc/kdump-adv-conf/kdump_dracut_modules/99kdumpbase/%{remove_dracut_prefix %{SOURCE106}}
 chmod 755 $RPM_BUILD_ROOT/etc/kdump-adv-conf/kdump_dracut_modules/99kdumpbase/%{remove_dracut_prefix %{SOURCE100}}
 chmod 755 $RPM_BUILD_ROOT/etc/kdump-adv-conf/kdump_dracut_modules/99kdumpbase/%{remove_dracut_prefix %{SOURCE101}}