From d429d92186b039e720ecca0723fa56f44e8e65e8 Mon Sep 17 00:00:00 2001
From: Julien Cristau <jcristau@debian.org>
Date: Thu, 10 Oct 2019 21:50:29 +0200
Subject: [PATCH] ud-generate: use subprocess.Popen instead of os.popen in
 GenCDB.

---
 debian/changelog |  1 +
 ud-generate      | 26 +++++++++++---------------
 2 files changed, 12 insertions(+), 15 deletions(-)

diff --git a/debian/changelog b/debian/changelog
index e6df2bb..410485d 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -13,6 +13,7 @@ userdir-ldap (0.3.97) UNRELEASED; urgency=medium
 
   [ Julien Cristau ]
   * ud-mailgate: don't let punycode through.
+  * ud-generate: use subprocess.Popen instead of os.popen in GenCDB.
 
  -- Peter Palfrader <weasel@debian.org>  Sat, 06 Apr 2019 22:04:34 +0200
 
diff --git a/ud-generate b/ud-generate
index 97d003e..adc1436 100755
--- a/ud-generate
+++ b/ud-generate
@@ -645,28 +645,24 @@ def GenForward(accounts, File):
    Done(File, F, None)
 
 def GenCDB(accounts, File, key):
-   Fdb = None
+   prefix = ["/usr/bin/eatmydata"] if os.path.exists('/usr/bin/eatmydata') else []
+   # nothing else does the fsync stuff, so why do it here?
+   Fdb = subprocess.Popen(prefix + ["cdbmake", File, "%s.tmp" % File],
+                          preexec_fn=lambda: os.umask(0022),
+                          stdin=subprocess.PIPE)
    try:
-      OldMask = os.umask(0022)
-      # nothing else does the fsync stuff, so why do it here?
-      prefix = "/usr/bin/eatmydata " if os.path.exists('/usr/bin/eatmydata') else ''
-      Fdb = os.popen("%scdbmake %s %s.tmp"%(prefix, File, File), "w")
-      os.umask(OldMask)
-
       # Write out the email address for each user
       for a in accounts:
          if not key in a: continue
          value = a[key]
          user = a['uid']
-         Fdb.write("+%d,%d:%s->%s\n" % (len(user), len(value), user, value))
+         Fdb.stdin.write("+%d,%d:%s->%s\n" % (len(user), len(value), user, value))
 
-      Fdb.write("\n")
-   # Oops, something unspeakable happened.
-   except:
-      Fdb.close()
-      raise
-   if Fdb.close() != None:
-      raise "cdbmake gave an error"
+      Fdb.stdin.write("\n")
+   finally:
+      Fdb.stdin.close()
+      if Fdb.wait() != 0:
+         raise Exception("cdbmake gave an error")
 
 def GenDBM(accounts, File, key):
    Fdb = None
-- 
2.20.1