[core] New o2-aliecs-shmcleaner script + Makefile for it

Author: teo

Makefile

@@ -87,12 +87,26 @@ $(WHAT):
 #	@echo ${PWD}
 	@$(WHAT_$@_BUILD_FLAGS) go build -mod=vendor $(VERBOSE_$(V)) -o bin/$@ $(LDFLAGS) ./cmd/$@
 
+# special case: if the current WHAT is o2-aliecs-executor, also copy over the shmcleaner script
+	@if [ $@ == "o2-aliecs-executor" ]; then \
+		echo -e "\033[1;33mcopy\033[0m ./cmd/o2-aliecs-shmcleaner  \033[1;33m==>\033[0m  \033[1;34m./bin/o2-aliecs-shmcleaner\033[0m"; \
+		cp cmd/o2-aliecs-shmcleaner bin/o2-aliecs-shmcleaner; \
+		chmod +x bin/o2-aliecs-shmcleaner; \
+	fi; \
+
 $(INSTALL_WHAT):
 #	@echo -e "WHAT_$(@:install_%=%)_BUILD_FLAGS $(WHAT_$(@:install_%=%)_BUILD_FLAGS)"
 	@echo -e "\033[1;33mgo install -mod=vendor\033[0m ./cmd/$(@:install_%=%)  \033[1;33m==>\033[0m  \033[1;34m$$GOPATH/bin/$(@:install_%=%)\033[0m"
 #	@echo ${PWD}
 	@$(WHAT_$(@:install_%=%)_BUILD_FLAGS) go install -mod=vendor $(VERBOSE_$(V)) $(LDFLAGS) ./cmd/$(@:install_%=%)
 
+# special case: if the current WHAT is o2-aliecs-executor, also copy over the shmcleaner script
+	@if [ $@ == "install_o2-aliecs-executor" ]; then \
+		echo -e "\033[1;33minstall\033[0m ./cmd/o2-aliecs-shmcleaner  \033[1;33m==>\033[0m  \033[1;34m$$GOPATH/bin/o2-aliecs-shmcleaner\033[0m"; \
+		cp cmd/o2-aliecs-shmcleaner $${GOPATH}/bin/o2-aliecs-shmcleaner; \
+		chmod +x $${GOPATH}/bin/o2-aliecs-shmcleaner; \
+	fi; \
+
 generate:
 ifndef HAS_PROTOC
 	$(MAKE) tools/protoc

cmd/o2-aliecs-shmcleaner

@@ -0,0 +1,50 @@
+#!/bin/bash
+
+# === This file is part of ALICE O² ===
+#
+#  Copyright 2021 CERN and copyright holders of ALICE O².
+#  Author: Teo Mrnjavac <teo.mrnjavac@cern.ch>
+#
+#  Partially derived from Torus Makefile <https://github.com/coreos/torus>
+#
+#  This program is free software: you can redistribute it and/or modify
+#  it under the terms of the GNU General Public License as published by
+#  the Free Software Foundation, either version 3 of the License, or
+#  (at your option) any later version.
+#
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License
+#  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+#  In applying this license CERN does not waive the privileges and
+#  immunities granted to it by virtue of its status as an
+#  Intergovernmental Organization or submit itself to any jurisdiction.
+
+O2_INFOLOGGER_PATH=/opt/o2-InfoLogger
+export O2_SYSTEM=ECS
+export O2_FACILITY=core/shmcleaner
+export O2_PARTITION=${O2_PARTITION:-}
+export O2_ROLE=${O2_ROLE:-}
+
+ANY_FILES_CLEANED=false
+
+for SHM_FILE in /dev/shm/*; do
+  if [ -f $SHM_FILE ] ; then
+    SIZE=$(ls -lah $SHM_FILE | awk -F " " {'print $5'})
+    if ! fuser -s $SHM_FILE ; then
+      rm -f $SHM_FILE
+      echo "freed unused shared memory $SHM_FILE ($SIZE)" | $O2_INFOLOGGER_PATH/bin/o2-infologger-log -x -s Debug -o Facility=$O2_FACILITY
+      ANY_FILES_CLEANED=true
+    else
+      echo "could not free shared memory in use $SHM_FILE ($SIZE)" | $O2_INFOLOGGER_PATH/bin/o2-infologger-log -x -s Warning -o Facility=$O2_FACILITY
+    fi
+  fi
+done
+
+if [ "$ANY_FILES_CLEANED" = false ] ; then
+  echo "no shared memory freed" | $O2_INFOLOGGER_PATH/bin/o2-infologger-log -x -s Debug -o Facility=$O2_FACILITY
+fi