use systemd dropin configs

archmate.sh

@@ -470,13 +470,30 @@ EOF
 COMMIT
 EOF
 
-  # systemd tweaks
-  sed -i.bak 's/^#SystemMaxUse=.*/SystemMaxUse=50M/g' /etc/systemd/journald.conf
-  sed -i.bak 's/^#KillUserProcesses=.*/KillUserProcesses=yes/g' /etc/systemd/logind.conf
-  sed -i.bak 's/^#Storage=.*/Storage=none/g' /etc/systemd/coredump.conf
+  # keep the journal small
+  mkdir -p /etc/systemd/journald.conf.d
+  cat << 'EOF' > /etc/systemd/journald.conf.d/logtime.conf
+[Journal]
+MaxRetentionSec=1week
+SystemMaxUse=50M
+EOF
+
+  # kill user processes on logout
+  mkdir -p /etc/systemd/logind.conf.d
+  cat << 'EOF' > /etc/systemd/logind.conf.d/killprocs.conf
+[Login]
+KillUserProcesses=yes
+EOF
+
+  # don't save coredumps
+  mkdir -p /etc/systemd/coredump.conf.d
+  cat << 'EOF' > /etc/systemd/coredump.conf.d/storage.conf
+[Coredump]
+Storage=none
+EOF
   echo 'kernel.core_pattern=' > /etc/sysctl.d/50-coredump.conf
 
-  # desktop system, not being able to strace other PIDs is a PITA
+  # allow strace of own processes
   echo 'kernel.yama.ptrace_scope=0' > /etc/sysctl.d/10-ptrace.conf
 
   logact systemctl enable lightdm.service