systemd: use unit name in PrivateTmp directories

Unit name is used whole in the directory name, so that the unit name
can be easily extracted from it, e.g. "/tmp/systemd-abcd.service-DEDBIF1".

https://bugzilla.redhat.com/show_bug.cgi?id=957439

Makefile.am

@@ -1105,6 +1105,7 @@ tests += \
 	test-utf8 \
 	test-ellipsize \
 	test-util \
+	test-namespace \
 	test-date \
 	test-sleep \
 	test-replace-var \
@@ -1225,6 +1226,12 @@ test_util_SOURCES = \
 test_util_LDADD = \
 	libsystemd-core.la
 
+test_namespace_SOURCES = \
+	src/test/test-namespace.c
+
+test_namespace_LDADD = \
+	libsystemd-core.la
+
 test_hashmap_SOURCES = \
 	src/test/test-hashmap.c
 

src/core/execute.c

@@ -1089,7 +1089,7 @@ int exec_spawn(ExecCommand *command,
         free(line);
 
         if (context->private_tmp && !context->tmp_dir && !context->var_tmp_dir) {
-                r = setup_tmpdirs(&context->tmp_dir, &context->var_tmp_dir);
+                r = setup_tmpdirs(unit_id, &context->tmp_dir, &context->var_tmp_dir);
                 if (r < 0)
                         return r;
         }

src/core/namespace.c

@@ -184,26 +184,29 @@ static int make_read_only(BindMount *m) {
         return 0;
 }
 
-int setup_tmpdirs(char **tmp_dir,
+int setup_tmpdirs(const char *unit_id,
+                  char **tmp_dir,
                   char **var_tmp_dir) {
         int r = 0;
-        char tmp_dir_template[] = "/tmp/systemd-private-XXXXXX",
-             var_tmp_dir_template[] = "/var/tmp/systemd-private-XXXXXX";
+        _cleanup_free_ char *tmp = NULL, *var = NULL;
 
         assert(tmp_dir);
         assert(var_tmp_dir);
 
-        r = create_tmp_dir(tmp_dir_template, tmp_dir);
+        tmp = strjoin("/tmp/systemd-", unit_id, "-XXXXXXX", NULL);
+        var = strjoin("/var/tmp/systemd-", unit_id, "-XXXXXXX", NULL);
+
+        r = create_tmp_dir(tmp, tmp_dir);
         if (r < 0)
                 return r;
 
-        r = create_tmp_dir(var_tmp_dir_template, var_tmp_dir);
+        r = create_tmp_dir(var, var_tmp_dir);
         if (r == 0)
                 return 0;
 
         /* failure */
         rmdir(*tmp_dir);
-        rmdir(tmp_dir_template);
+        rmdir(tmp);
         free(*tmp_dir);
         *tmp_dir = NULL;
 

src/core/namespace.h

@@ -23,7 +23,10 @@
 
 #include <stdbool.h>
 
-int setup_tmpdirs(char **tmp_dir, char **var_tmp_dir);
+int setup_tmpdirs(const char *unit_id,
+                  char **tmp_dir,
+                  char **var_tmp_dir);
+
 int setup_namespace(char **read_write_dirs,
                     char **read_only_dirs,
                     char **inaccessible_dirs,

src/test/test-namespace.c

@@ -0,0 +1,56 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+  This file is part of systemd.
+
+  Copyright 2013 Zbigniew Jędrzejewski-Szmek
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU Lesser General Public License as published by
+  the Free Software Foundation; either version 2.1 of the License, or
+  (at your option) any later version.
+
+  systemd is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <libgen.h>
+
+#include "namespace.h"
+#include "util.h"
+
+static void test_tmpdir(const char *id, const char *A, const char *B) {
+        _cleanup_free_ char *a, *b;
+
+        assert_se(setup_tmpdirs(id, &a, &b) == 0);
+        assert(startswith(a, A));
+        assert(startswith(b, B));
+        assert(access(a, F_OK) == 0);
+        assert(access(b, F_OK) == 0);
+
+        assert_se(rmdir(a) == 0);
+        assert_se(rmdir(b) == 0);
+
+        assert(endswith(a, "/tmp"));
+        assert(endswith(b, "/tmp"));
+
+        assert_se(rmdir(dirname(a)) == 0);
+        assert_se(rmdir(dirname(b)) == 0);
+}
+
+int main(int argc, char *argv[]) {
+        test_tmpdir("abcd.service",
+                    "/tmp/systemd-abcd.service-",
+                    "/var/tmp/systemd-abcd.service-");
+
+        test_tmpdir("sys-devices-pci0000:00-0000:00:1a.0-usb3-3\\x2d1-3\\x2d1:1.0-bluetooth-hci0.device",
+                    "/tmp/systemd-sys-devices-pci0000:00-0000:00:1a.0-usb3-3\\x2d1-3\\x2d1:1.0-bluetooth-hci0.device-",
+                    "/var/tmp/systemd-sys-devices-pci0000:00-0000:00:1a.0-usb3-3\\x2d1-3\\x2d1:1.0-bluetooth-hci0.device-");
+
+        return 0;
+}