Remove hidden-files in coredump(dir) during boot

It is observed that systemd-coredump has the capability to remove
the older dumps which are having the naming style mentioned in
/proc/sys/kernel/core_pattern, But will not remove any other files
present in the coredump directory.

It can happen that, while processing a dump the BMC Crashes and there
by leaving the partial dumps in the coredump directory and these will
be hidden and will not be removed by systemd-coredump service.These
files can get piled up and the BMC can run into OOM condition.So idea
of this commit is to make sure that , we remove all the temporary
hidden files in the coredump directory during the next BMC boot.

- Made a rule and placed it in /usr/lib/tmpfiles.d/*.conf which will
  be used by systemd-tmpfiles to remove the hidden files in coredump
  directory during boot.

Partially Resolves openbmc/openbmc#2826

(From meta-phosphor rev: 9fe03c666476de51ab75904f008f45f8485ac9b2)

Change-Id: Iff96b3880ebdeccb842e6aa7ff9807fcd451fb5a
Signed-off-by: manojeda <manojeda@in.ibm.com>
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/meta-phosphor/recipes-phosphor/dump/phosphor-debug-collector.bb b/meta-phosphor/recipes-phosphor/dump/phosphor-debug-collector.bb
index b480064..da3151b 100644
--- a/meta-phosphor/recipes-phosphor/dump/phosphor-debug-collector.bb
+++ b/meta-phosphor/recipes-phosphor/dump/phosphor-debug-collector.bb
@@ -61,7 +61,7 @@
 
 SYSTEMD_SUBSTITUTIONS += "BMC_DUMP_PATH:${bmc_dump_path}:${MGR_SVC}"
 
-FILES_${PN}-manager += "${sbindir}/phosphor-dump-manager"
+FILES_${PN}-manager += "${sbindir}/phosphor-dump-manager ${exec_prefix}/lib/tmpfiles.d/coretemp.conf"
 FILES_${PN}-monitor += "${sbindir}/phosphor-dump-monitor"
 FILES_${PN}-dreport += "${bindir}/dreport"
 FILES_${PN}-scripts += "${dreport_dir}"
@@ -72,6 +72,12 @@
 EXTRA_OECONF = "BMC_DUMP_PATH=${bmc_dump_path}"
 
 S = "${WORKDIR}/git"
+SRC_URI += "file://coretemp.conf"
+
+do_install_append() {
+    install -d ${D}${exec_prefix}/lib/tmpfiles.d
+    install -m 644 ${WORKDIR}/coretemp.conf ${D}${exec_prefix}/lib/tmpfiles.d/
+}
 
 # Install dreport script
 # From tools/dreport.d/dreport to /usr/bin/dreport
diff --git a/meta-phosphor/recipes-phosphor/dump/phosphor-debug-collector/coretemp.conf b/meta-phosphor/recipes-phosphor/dump/phosphor-debug-collector/coretemp.conf
new file mode 100644
index 0000000..b9a36e6
--- /dev/null
+++ b/meta-phosphor/recipes-phosphor/dump/phosphor-debug-collector/coretemp.conf
@@ -0,0 +1,8 @@
+# This configuration file will help in
+# removing all the hidden files in the
+# coredump folder at boot time.
+#
+# See tmpfiles.d for more details
+
+R! /var/lib/systemd/coredump/.[^.] - - - -
+R! /var/lib/systemd/coredump/.??* - - - -