From ebd853c83ce0f03fa59d1672b86190406659d901 Mon Sep 17 00:00:00 2001
From: Christian Grothoff <christian@grothoff.org>
Date: Thu, 31 Dec 2020 09:12:43 +0100
Subject: do not use atomic write for configuration file, we may not have
 permissions to do this, also should not be necessary

---
 debian/gnunet.postrm     | 14 +++++++++-----
 src/util/configuration.c | 48 ++++++++++++++++++++++++++++++++----------------
 2 files changed, 41 insertions(+), 21 deletions(-)

diff --git a/debian/gnunet.postrm b/debian/gnunet.postrm
index 0aba484db..2c3887202 100644
--- a/debian/gnunet.postrm
+++ b/debian/gnunet.postrm
@@ -33,10 +33,6 @@ remove_gns() {
 		}
 		s/^(hosts:)(.*)/$1.remove($2)/e;
 	' /etc/nsswitch.conf
-        # remove the gns nsswitch plugins as well
-        rm -rf /usr/lib/x86_64-linux-gnu/usr/libnss_gns.so.2
-        rm -rf /usr/lib/x86_64-linux-gnu/usr/libnss_gns4.so.2
-        rm -rf /usr/lib/x86_64-linux-gnu/usr/libnss_gns6.so.2
 }
 
 
@@ -81,11 +77,19 @@ case "${1}" in
 			delgroup --quiet --system --only-if-empty ${GNUNETDNS_GROUP} || true
 		fi
 
-		rm -rf /var/log/gnunetd /var/lib/gnunet /etc/default/gnunet
+		rm -rf /var/log/gnunet.log /var/lib/gnunet /etc/default/gnunet
 		;;
 
 	remove|upgrade|failed-upgrade|abort-install|abort-upgrade|disappear)
 
+		if $_LIBNSSWITCH
+		then
+			rm -rf /usr/lib/x86_64-linux-gnu/usr/libnss_gns.so.2
+			rm -rf /usr/lib/x86_64-linux-gnu/usr/libnss_gns4.so.2
+			rm -rf /usr/lib/x86_64-linux-gnu/usr/libnss_gns6.so.2
+			remove_gns
+		fi
+
 		;;
 
 	*)
diff --git a/src/util/configuration.c b/src/util/configuration.c
index ecdcb3d53..23e6ced98 100644
--- a/src/util/configuration.c
+++ b/src/util/configuration.c
@@ -543,23 +543,39 @@ GNUNET_CONFIGURATION_write (struct GNUNET_CONFIGURATION_Handle *cfg,
   }
   cfg_buf = GNUNET_CONFIGURATION_serialize (cfg,
                                             &size);
-  (void) GNUNET_DISK_directory_remove (fn);
-  if (GNUNET_OK !=
-      GNUNET_DISK_fn_write (fn,
-                            cfg_buf,
-                            size,
-                            GNUNET_DISK_PERM_USER_READ
-                            | GNUNET_DISK_PERM_USER_WRITE
-                            | GNUNET_DISK_PERM_GROUP_READ
-                            | GNUNET_DISK_PERM_GROUP_WRITE))
   {
-    GNUNET_free (fn);
-    GNUNET_free (cfg_buf);
-    LOG (GNUNET_ERROR_TYPE_WARNING,
-         "Writing configuration to file `%s' failed\n",
-         filename);
-    cfg->dirty = GNUNET_SYSERR;   /* last write failed */
-    return GNUNET_SYSERR;
+    struct GNUNET_DISK_FileHandle *h;
+
+    h = GNUNET_DISK_file_open (fn,
+                               GNUNET_DISK_OPEN_WRITE
+                               | GNUNET_DISK_OPEN_TRUNCATE
+                               | GNUNET_DISK_OPEN_CREATE,
+                               GNUNET_DISK_PERM_USER_READ
+                               | GNUNET_DISK_PERM_USER_WRITE
+                               | GNUNET_DISK_PERM_GROUP_READ
+                               | GNUNET_DISK_PERM_GROUP_WRITE);
+    if (NULL == h)
+    {
+      GNUNET_free (fn);
+      return GNUNET_SYSERR;
+    }
+    if (((ssize_t) size) !=
+        GNUNET_DISK_file_write (h,
+                                cfg_buf,
+                                size))
+    {
+      GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING,
+                                "write",
+                                fn);
+      GNUNET_DISK_file_close (h);
+      (void) GNUNET_DISK_directory_remove (fn);
+      GNUNET_free (fn);
+      GNUNET_free (cfg_buf);
+      cfg->dirty = GNUNET_SYSERR;   /* last write failed */
+      return GNUNET_SYSERR;
+    }
+    GNUNET_assert (GNUNET_OK ==
+                   GNUNET_DISK_file_close (h));
   }
   GNUNET_free (fn);
   GNUNET_free (cfg_buf);
-- 
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