Add flight recoder service

Flight recorder service, trace-cmd.service, provides a feature to
automatically start trace-cmd command at every system start-up and to
automatically reload trace-cmd command at every kernel module loading
to enable tracepoints provided by kernel modules.

Thanks to this feature, once system panic occurs, users retrieve
ftrace ring buffer from crash dump that is created by some crash dump
mechanism such as kdump and virsh dump using crash trace command [1]
and can perform failure analysis based on ftrace event logs.

Historically, this feature has been provided only in the RHEL7 and
RHEL8 versions of trace-cmd packages so far. However, with the
introduction of CentOS Stream, RHEL's development process changed and
now CentOS Stream is an upstream of RHEL and Fedora Linux is the
upstream of CentOS Stream [2], due to which, Red Hat now follows
upstream-first policy strictly and requires this feature be provided
in its upstream.

[1] https://src.fedoraproject.org/rpms/crash-trace-command
[2] https://www.redhat.com/en/topics/linux/what-is-centos-stream

Signed-off-by: KUDOH Takashi <t-kudoh@fujitsu.com>
Signed-off-by: HATAYAMA Daisuke <d.hatayama@fujitsu.com>

98-trace-cmd.rules

@@ -0,0 +1 @@
+SUBSYSTEM=="module", ACTION=="add", PROGRAM="/usr/bin/systemctl is-active trace-cmd.service", PROGRAM="/usr/bin/systemctl reload trace-cmd.service"

trace-cmd.conf

@@ -0,0 +1,4 @@
+# ftrace based flightrecorder configuration file.
+
+# trace-cmd options
+OPTS="-b 2048 -i -e block -e irq -e mce -e module -e power -e sched -e signal -e timer -e workqueue -e kvm -e net"

trace-cmd.service

@@ -0,0 +1,15 @@
+[Unit]
+Description=trace-cmd Flightrecorder
+DefaultDependencies=no
+Before=sysinit.target
+
+[Service]
+Type=oneshot
+RemainAfterExit=yes
+EnvironmentFile=/etc/sysconfig/trace-cmd.conf
+ExecStart=/usr/bin/trace-cmd start $OPTS
+ExecStop=/usr/bin/trace-cmd reset
+ExecReload=/usr/bin/trace-cmd start $OPTS
+
+[Install]
+WantedBy=multi-user.target

trace-cmd.spec

@@ -6,7 +6,7 @@
 
 Name: trace-cmd
 Version: %{srcversion}
-Release: 1%{?dist}
+Release: 2%{?dist}
 License: GPLv2 and LGPLv2
 Summary: A user interface to Ftrace
 Requires: libtracecmd
@@ -21,6 +21,9 @@ URL: http://git.kernel.org/?p=linux/kernel/git/rostedt/trace-cmd.git;a=summary
 # cd trace-cmd
 # git archive --prefix=trace-cmd-%%{version}/ -o trace-cmd-v%%{version}.tar.gz %%{git_commit}
 Source0: https://git.kernel.org/pub/scm/utils/trace-cmd/trace-cmd.git/snapshot/trace-cmd-v%{srcversion}.tar.gz
+Source1: trace-cmd.conf
+Source2: trace-cmd.service
+Source3: 98-trace-cmd.rules
 BuildRequires: make
 BuildRequires: gcc
 BuildRequires: xmlto
@@ -39,6 +42,7 @@ BuildRequires: libtracefs-devel
 BuildRequires: audit-libs-devel
 BuildRequires: chrpath
 BuildRequires: swig
+BuildRequires: systemd-rpm-macros
 
 %description
 trace-cmd is a user interface to Ftrace. Instead of needing to use the
@@ -70,6 +74,9 @@ Development files of the libtracecmd library
 
 %prep
 %autosetup -n %{name}-v%{srcversion}
+cp %{SOURCE1} .
+cp %{SOURCE2} .
+cp %{SOURCE3} .
 
 %build
 # MANPAGE_DOCBOOK_XSL define is hack to avoid using locate
@@ -90,7 +97,15 @@ make libdir=%{_libdir} prefix=%{_prefix} V=1 DESTDIR=%{buildroot}/ CFLAGS="%{opt
 find %{buildroot}%{_mandir} -type f | xargs chmod u-x,g-x,o-x
 find %{buildroot}%{_datadir} -type f | xargs chmod u-x,g-x,o-x
 find %{buildroot}%{_libdir} -type f -iname "*.so" | xargs chmod 0755
-mkdir -p %{buildroot}/%{_sysconfdir}
+mkdir -p -m755 %{buildroot}/%{_sysconfdir}/sysconfig/
+mkdir -p -m755 %{buildroot}/%{_unitdir}/
+mkdir -p -m755 %{buildroot}/%{_udevrulesdir}/
+install -p -m 644 trace-cmd.conf %{buildroot}/%{_sysconfdir}/sysconfig/
+install -p -m 644 trace-cmd.service %{buildroot}/%{_unitdir}/
+install -p -m 644 98-trace-cmd.rules %{buildroot}/%{_udevrulesdir}/
+
+%preun
+%systemd_preun %{name}.service
 
 %files
 %doc COPYING COPYING.LIB README
@@ -98,6 +113,9 @@ mkdir -p %{buildroot}/%{_sysconfdir}
 %{_mandir}/man1/%{name}*
 %{_mandir}/man5/%{name}*
 %{_sysconfdir}/bash_completion.d/trace-cmd.bash
+%{_sysconfdir}/sysconfig/trace-cmd.conf
+%{_unitdir}/trace-cmd.service
+%{_udevrulesdir}/98-trace-cmd.rules
 
 %files python3
 %doc Documentation/README.PythonPlugin
@@ -117,6 +135,9 @@ mkdir -p %{buildroot}/%{_sysconfdir}
 %{_includedir}/trace-cmd
 
 %changelog
+* Fri Mar 18 2022 KUDOH Takashi <t-kudoh@fujitsu.com> - 2.9.7-2
+- Add flight recoder service
+
 * Wed Feb 16 2022 Zamir SUN <sztsian@gmail.com> - 2.9.7-1
 - Update to 2.9.7