utils: use internal which implementation

* removes runtime dependency on which
* fixes aa-unconfined when ss is installed outside {/usr,}/bin

Signed-off-by: Michal Vasilek <michal.vasilek@nic.cz>

utils/aa-unconfined

@@ -118,7 +118,7 @@ def read_proc_current(filename):
 pids = set()
 if paranoid:
     pids = get_all_pids()
-elif args.with_ss or (not args.with_netstat and (os.path.exists('/bin/ss') or os.path.exists('/usr/bin/ss'))):
+elif args.with_ss or (not args.with_netstat and (aa.which("ss") is not None)):
     pids = get_pids_ss()
 else:
     pids = get_pids_netstat()

utils/apparmor/easyprof.py

@@ -22,6 +22,8 @@ import subprocess
 import sys
 import tempfile
 
+from apparmor.aa import which
+
 #
 # TODO: move this out to the common library
 #
@@ -294,13 +296,9 @@ class AppArmorEasyProfile:
         if os.path.isfile(self.conffile):
             self._get_defaults()
 
-        self.parser_path = '/sbin/apparmor_parser'
+        self.parser_path = which('apparmor_parser')
         if opt.parser_path:
             self.parser_path = opt.parser_path
-        elif not os.path.exists(self.parser_path):
-            rc, self.parser_path = cmd(['which', 'apparmor_parser'])
-            if rc != 0:
-                self.parser_path = None
 
         self.parser_base = "/etc/apparmor.d"
         if opt.parser_base:

utils/apparmor/sandbox.py

@@ -9,6 +9,7 @@
 # ------------------------------------------------------------------
 
 from apparmor.common import AppArmorException, debug, error, msg, cmd
+from apparmor.aa import which
 import apparmor.easyprof
 import optparse
 import os
@@ -31,8 +32,7 @@ def check_requirements(binary):
 
     for e in exes:
         debug("Searching for '%s'" % e)
-        rc, report = cmd(['which', e])
-        if rc != 0:
+        if which(e) is None:
             error("Could not find '%s'" % e, do_exit=False)
             return False
 
@@ -306,8 +306,7 @@ class SandboxXephyr(SandboxXserver):
     def start(self):
         for e in ['Xephyr', 'matchbox-window-manager']:
             debug("Searching for '%s'" % e)
-            rc, report = cmd(['which', e])
-            if rc != 0:
+            if which(e) is None:
                 raise AppArmorException("Could not find '%s'" % e)
 
         '''Run any setup code'''
@@ -567,8 +566,7 @@ EndSection
 
     def start(self):
         debug("Searching for '%s'" % 'xpra')
-        rc, report = cmd(['which', 'xpra'])
-        if rc != 0:
+        if which('xpra') is None:
             raise AppArmorException("Could not find '%s'" % 'xpra')
 
         if self.driver == "xdummy":