X-Git-Url: https://git.decadent.org.uk/gitweb/?a=blobdiff_plain;f=daklib%2Fcontents.py;h=a158e8fcd4bb7d2ed27e8547b79b03d1cbd84b8a;hb=b8690d6b1256a4a95198b874d9eb1aab62a825fb;hp=b56a9c6ce322a5913c7d767b3b13ced8aae820ad;hpb=8ba1b12293e55da930cc0be48c1616723ec59088;p=dak.git

diff --git a/daklib/contents.py b/daklib/contents.py
index b56a9c6c..a158e8fc 100755
--- a/daklib/contents.py
+++ b/daklib/contents.py
@@ -29,7 +29,9 @@ from daklib.dbconn import *
 from daklib.config import Config
 
 from multiprocessing import Pool
-from subprocess import Popen, PIPE
+from shutil import rmtree
+from subprocess import Popen, PIPE, check_call
+from tempfile import mkdtemp
 
 import os.path
 
@@ -241,7 +243,6 @@ def generate_helper(suite_id, arch_id, overridetype_id, component_id = None):
     '''
     This function is called in a new subprocess.
     '''
-    DBConn().reset()
     session = DBConn().session()
     suite = Suite.get(suite_id, session)
     architecture = Architecture.get(arch_id, session)
@@ -308,15 +309,70 @@ class ContentsScanner(object):
         session.close()
         return { 'processed': processed, 'remaining': remaining }
 
-reset = False
-
 def scan_helper(binary_id):
     '''
     This function runs in a subprocess.
     '''
-    global reset
-    if not reset:
-        DBConn().reset()
-        reset = True
     scanner = ContentsScanner(binary_id)
     scanner.scan()
+
+
+class UnpackedSource(object):
+    '''
+    UnpackedSource extracts a source package into a temporary location and
+    gives you some convinient function for accessing it.
+    '''
+    def __init__(self, dscfilename):
+        '''
+        The dscfilename is a name of a DSC file that will be extracted.
+        '''
+        self.root_directory = os.path.join(mkdtemp(), 'root')
+        command = ('dpkg-source', '--no-copy', '--no-check', '-x', dscfilename,
+            self.root_directory)
+        # dpkg-source does not have a --quiet option
+        devnull = open(os.devnull, 'w')
+        check_call(command, stdout = devnull, stderr = devnull)
+        devnull.close()
+
+    def get_root_directory(self):
+        '''
+        Returns the name of the package's root directory which is the directory
+        where the debian subdirectory is located.
+        '''
+        return self.root_directory
+
+    def get_changelog_file(self):
+        '''
+        Returns a file object for debian/changelog or None if no such file exists.
+        '''
+        changelog_name = os.path.join(self.root_directory, 'debian', 'changelog')
+        try:
+            return open(changelog_name)
+        except IOError:
+            return None
+
+    def get_all_filenames(self):
+        '''
+        Returns an iterator over all filenames. The filenames will be relative
+        to the root directory.
+        '''
+        skip = len(self.root_directory) + 1
+        for root, _, files in os.walk(self.root_directory):
+            for name in files:
+                yield os.path.join(root[skip:], name)
+
+    def cleanup(self):
+        '''
+        Removes all temporary files.
+        '''
+        if self.root_directory is None:
+            return
+        parent_directory = os.path.dirname(self.root_directory)
+        rmtree(parent_directory)
+        self.root_directory = None
+
+    def __del__(self):
+        '''
+        Enforce cleanup.
+        '''
+        self.cleanup()