PR 4286: try to kill pacman first

recipes/msys2/all/conanfile.py

@@ -1,7 +1,8 @@
 from conans import ConanFile, tools
-from conans.errors import ConanInvalidConfiguration
+from conans.errors import ConanInvalidConfiguration, ConanException
 import os
 import shutil
+import subprocess
 
 
 class MSYS2Conan(ConanFile):
@@ -33,8 +34,6 @@ def validate(self):
         if tools.Version(self.version) <= "20161025":
             raise ConanInvalidConfiguration("msys2 v.20161025 is no longer supported")    
 
-
-
     def _download(self, url, sha256):
         from six.moves.urllib.parse import urlparse
         filename = os.path.basename(urlparse(url[0]).path)
@@ -78,6 +77,27 @@ def _update_pacman(self):
             self.run('bash -l -c "pacman -Rc dash --noconfirm"')
             self.run('bash -l -c "pacman -Syu --noconfirm"')
 
+    def _kill_pacman(self):
+        taskkill_exe = os.path.join(os.environ['WINDIR'], 'system32', 'taskkill.exe')
+
+        log_out = True
+        if log_out:
+            out = subprocess.PIPE
+            err = subprocess.STDOUT
+        else:
+            out = file(os.devnull, 'w')
+            err = subprocess.PIPE
+
+        if os.path.exists(taskkill_exe):
+            taskkill_cmd = taskkill_exe + ' /f /fi "MODULES eq msys-2.0.dll"'
+            try:
+                proc = subprocess.Popen(taskkill_cmd, stdout=out, stderr=err, bufsize=1)
+            except OSError as e:
+                if e.errno == errno.ENOENT:
+                    raise ConanException("Cannot kill pacman")
+
+    def configure(self):
+        self._kill_pacman()
 
     @property
     def _msys_dir(self):