Index: b/lib/routines.c
===================================================================
--- a/lib/routines.c
+++ b/lib/routines.c
@@ -242,3 +242,50 @@
   /* Don't complain if you can't unlink.  Who cares of a tmp file? */
   unlink (filename);
 }
+
+/*
+ * Securely generate a temp file, and make sure it gets
+ * deleted upon exit.
+ */
+static char **	tempfiles;
+static unsigned	ntempfiles;
+
+static void
+cleanup_tempfiles()
+{
+	while (ntempfiles--)
+		unlink(tempfiles[ntempfiles]);
+}
+
+char *
+safe_tempnam(const char *pfx)
+{
+	char	*dirname, *filename;
+	int	fd;
+
+	if (!(dirname = getenv("TMPDIR")))
+		dirname = "/tmp";
+
+	tempfiles = (char **) realloc(tempfiles,
+			(ntempfiles+1) * sizeof(char *));
+	if (tempfiles == NULL)
+		return NULL;
+
+	filename = malloc(strlen(dirname) + strlen(pfx) + sizeof("/XXXXXX"));
+	if (!filename)
+		return NULL;
+
+	sprintf(filename, "%s/%sXXXXXX", dirname, pfx);
+
+	if ((fd = mkstemp(filename)) < 0) {
+		free(filename);
+		return NULL;
+	}
+	close(fd);
+
+	if (ntempfiles == 0)
+		atexit(cleanup_tempfiles);
+	tempfiles[ntempfiles++] = filename;
+
+	return filename;
+}
Index: b/lib/routines.h
===================================================================
--- a/lib/routines.h
+++ b/lib/routines.h
@@ -255,7 +255,8 @@
 /* If _STR_ is not defined, give it a tempname in _TMPDIR_ */
 #define tempname_ensure(Str)				\
 do {							\
-  (Str) = (Str) ? (Str) : tempnam (NULL, "a2_");	\
+  (Str) = (Str) ? (Str) : safe_tempnam("a2_");	\
 } while (0)
+char * safe_tempnam(const char *);
 
 #endif
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<div class='path'>path: <a href='/guix/log/?id=2b613a1a5d4d41b0b5d1f6ea7254585be0c209fa'>root</a>/<a href='/guix/log/gnu?id=2b613a1a5d4d41b0b5d1f6ea7254585be0c209fa'>gnu</a>/<a href='/guix/log/gnu/tests?id=2b613a1a5d4d41b0b5d1f6ea7254585be0c209fa'>tests</a>/<a href='/guix/log/gnu/tests/databases.scm?id=2b613a1a5d4d41b0b5d1f6ea7254585be0c209fa'>databases.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/gnu/tests/databases.scm?id=2b613a1a5d4d41b0b5d1f6ea7254585be0c209fa&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2018-10-18 01:12:22 +0200'>2018-10-18</span></td><td><a href='/guix/commit/gnu/tests/databases.scm?id=39d7fdce453b0ca23ecbed72048647debbaa58a6'>services: dhcp-client: Deprecate 'dhcp-client-service' procedure.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/services/networking.scm (dhcp-client-service-type): Add default
value.
* gnu/system/examples/bare-bones.tmpl: Use (service
dhcp-client-service-type) instead of (dhcp-client-service).
* gnu/system/examples/beaglebone-black.tmpl: Likewise.
* gnu/tests/base.scm (%avahi-os): Likewise.
* gnu/tests/databases.scm (%memcached-os): Likewise.
(%mongodb-os): Likewise.
* gnu/tests/dict.scm (%dicod-os): Likewise.
* gnu/tests/mail.scm (%opensmtpd-os): Likewise.
(%exim-os): Likewise.
(%dovecot-os): Likewise.
* gnu/tests/messaging.scm (run-xmpp-test): Likewise.
(run-bitlbee-test): Likewise.
* gnu/tests/monitoring.scm (%prometheus-node-exporter-os): Likewise.
* gnu/tests/networking.scm (%inetd-os): Likewise.
(run-iptables-test): Likewise.
* gnu/tests/nfs.scm (%base-os): Likewise.
* gnu/tests/rsync.scm (%rsync-os): Likewise.
* gnu/tests/ssh.scm (run-ssh-test): Likewise.
* gnu/tests/version-control.scm (%cgit-os): Likewise.
(%git-http-os): Likewise.
(%gitolite-os): Likewise.
* gnu/tests/virtualization.scm (%libvirt-os): Likewise.
* gnu/tests/web.scm (%httpd-os): Likewise.
(%nginx-os): Likewise.
(%varnish-os): Likewise.
(%php-fpm-os): Likewise.
(%hpcguix-web-os): Likewise.
(%tailon-os): Likewise.
* tests/guix-system.sh: Likewise.
* doc/guix.texi (Networking Services): Document
'dhcp-client-service-type' and remove 'dhcp-client-service'.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-03-10 16:20:55 +0000'>2018-03-10</span></td><td><a href='/guix/commit/gnu/tests/databases.scm?id=69f7cf2bf4ca3ab792438a9e7fb46f78ef0f227a'>tests: databases: Add a system test for PostgreSQL.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/tests/databases.scm (%postgresql-os, %test-postgresql): New variables.
(run-postgresql-test): New procedure.
</span></span></td><td>Christopher Baines</td></tr>
<tr><td><span title='2017-10-08 17:31:49 +0100'>2017-10-08</span></td><td><a href='/guix/commit/gnu/tests/databases.scm?id=02bc41c4cedd15c6a76ecd5218f9b5848de8baea'>tests: databases: Add a simple test for MySQL.</a><span class='msg-avail'>...<span class='msg-tooltip'>Previously, the activation phase for this service caused some systems using it
to not boot. This test checks that it's possible to boot a system using it,
and at least start the service.

* gnu/tests/databases.scm (%mysql-os, %test-mysql): New variables.
  (run-mysql-test): New procedure.
</span></span></td><td>Christopher Baines</td></tr>
<tr><td><span title='2017-10-06 21:24:30 +0100'>2017-10-06</span></td><td><a href='/guix/commit/gnu/tests/databases.scm?id=5266ff719e274056cb3e2b9740183f0063177255'>services: Add MongoDB.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/services/databases.scm (%default-mongodb-configuration-file,
  %mongodb-accounts, mongodb-service-type): New variables.
  (&lt;mongodb-configuration&gt;): New record type.
  (mongodb-activation, mongodb-shepherd-service): New procedures.
* gnu/tests/databases.scm (%test-mongodb): New variable.
* doc/guix.texi (Database Services): Add MongoDB documentation.
</span></span></td><td>Christopher Baines</td></tr>