pactest : Use tarfile module.

Previously, tar was called manually with os.system. This caused one fork per
package/db creation, which is costly, especially on cygwin. Besides, it also
caused some problems with directory with whitespaces (that could also be
fixed with quotes, but well..)
Using tarfile module is cleaner and more efficient, and still easy enough.

Benchmark (time make check) :
- windows / cygwin
prepatch:
real    6m36.360s
user    2m28.914s
sys     2m35.866s
postpatch:
real    5m25.428s
user    1m26.029s
sys     2m0.006s

- linux
prepatch:
real    1m22.629s
user    0m31.498s
sys     0m18.899s
postpatch:
real    1m11.465s
user    0m26.382s
sys     0m12.986s

Signed-off-by: Chantry Xavier <shiningxc@gmail.com>

pactest/pmdb.py

@@ -19,6 +19,7 @@
 import os
 import tempfile
 import shutil
+import tarfile
 
 import pmpkg
 from util import *
@@ -343,7 +344,13 @@ class pmdb:
         # Generate database archive
         mkdir(path)
         archive = os.path.join(path, "%s%s" % (self.treename, PM_EXT_DB))
-        os.system("tar zcf %s *" % archive)
+        tar = tarfile.open(archive, "w:gz")
+        for root, dirs, files in os.walk('.'):
+            for d in dirs:
+                tar.add(os.path.join(root, d), recursive=False)
+            for f in files:
+                tar.add(os.path.join(root, f))
+        tar.close()
 
         os.chdir(curdir)
         shutil.rmtree(tmpdir)

pactest/pmpkg.py

@@ -20,6 +20,7 @@ import os
 import tempfile
 import stat
 import shutil
+import tarfile
 
 from util import *
 
@@ -153,25 +154,25 @@ class pmpkg:
         for i in self.backup:
             data.append("backup = %s" % i)
         mkfile(".PKGINFO", "\n".join(data))
-        targets = ".PKGINFO"
 
         # .INSTALL
-        empty = 1
         if len(self.install.values()) > 0:
-            empty = 0
-        if not empty:
             mkinstallfile(".INSTALL", self.install)
-            targets += " .INSTALL"
 
-        # package files
+        # safely create the dir
-        if self.files:
-            targets += " *"
-
-        #safely create the dir
         mkdir(os.path.dirname(self.path))
 
         # Generate package archive
-        os.system("tar zcf %s %s" % (self.path, targets))
+        tar = tarfile.open(self.path, "w:gz")
+
+        # package files
+        for root, dirs, files in os.walk('.'):
+            for d in dirs:
+                tar.add(os.path.join(root, d), recursive=False)
+            for f in files:
+                tar.add(os.path.join(root, f))
+
+        tar.close()
 
         os.chdir(curdir)
         shutil.rmtree(tmpdir)