code improvements for snap to work in strict confinement

scripts/cpufreqctl.sh

@@ -1,7 +1,7 @@
 #!/usr/bin/env bash
 
 VERSION='20'
-cpucount=`nproc`
+cpucount=`cat /proc/cpuinfo|grep processor|wc -l`
 FLROOT=/sys/devices/system/cpu
 DRIVER=auto
 VERBOSE=0

snap/snapcraft.yaml

@@ -26,17 +26,23 @@ parts:
 apps:
   auto-cpufreq:
     command: bin/auto-cpufreq
-    environment:
-      LC_ALL: C.UTF-8
-      LANG: C.UTF-8
-      PKG_MARKER: SNAP
     plugs:
       - cpu-control
       - system-observe
       - hardware-observe
       - system-files
+    environment:
+      LC_ALL: C.UTF-8
+      LANG: C.UTF-8
+      PKG_MARKER: SNAP
+      
   service:
     command: bin/auto-cpufreq --daemon 2>&1 | tee -a /var/log/auto-cpufreq.log
+    plugs:
+      - cpu-control
+      - system-observe
+      - hardware-observe
+      - system-files
     environment:
       LC_ALL: C.UTF-8
       LANG: C.UTF-8

source/core.py

@@ -321,7 +321,7 @@ def sysinfo():
 
     # get distro information in snap env.
     if os.getenv("PKG_MARKER") == "SNAP":
-        searchfile = open("/usr/lib/os-release", "r")
+        searchfile = open("/var/lib/snapd/hostfs/etc/os-release", "r")
         for line in searchfile:
             if line.startswith('NAME='):
                 distro = line[5:line.find('$')].strip("\"")