conf-parser: accept trailing backslash at the end of the file (#8941)

This makes it behave the same whether there is a blank line or not at
the end of the file.  This is also consistent with the behavior of the
shell on a shell script that ends on a trailing backslash at the last
line.

Added tests to test_config_parse(), which only pass if the corresponding
change to config_parse() is included.

(cherry picked from commit 4f29e0db127dce9e1a28af4d7bf88c124ba257b7)

diff --git a/src/shared/conf-parser.c b/src/shared/conf-parser.c
index 252a2a0423c81e2cac2df2be0d6ea6581db07e6a..0bb8ed610da31ac5e41f29ac4bf99f31a1369112 100644 (file)
--- a/src/shared/conf-parser.c
+++ b/src/shared/conf-parser.c
@@ -413,6 +413,27 @@ int config_parse(const char *unit,
                 continuation = mfree(continuation);
         }
 
+        if (continuation) {
+                r = parse_line(unit,
+                               filename,
+                               ++line,
+                               sections,
+                               lookup,
+                               table,
+                               flags,
+                               &section,
+                               &section_line,
+                               &section_ignored,
+                               continuation,
+                               userdata);
+                if (r < 0) {
+                        if (flags & CONFIG_PARSE_WARN)
+                                log_warning_errno(r, "%s:%u: Failed to parse file: %m", filename, line);
+                        return r;
+
+                }
+        }
+
         return 0;
 }
 

diff --git a/src/test/test-conf-parser.c b/src/test/test-conf-parser.c
index c7f18b33f54d41dd8dd76a963c0a8692e517b9a3..c362041972500ddbc2c9850365d717eeba52fab2 100644 (file)
--- a/src/test/test-conf-parser.c
+++ b/src/test/test-conf-parser.c
@@ -306,6 +306,11 @@ static const char* const config_file[] = {
         "2\\\n"
         "3\n",
 
+        "[Section]\n"
+        "setting1=1\\\n"     /* continuation with extra trailing backslash at the end */
+        "2\\\n"
+        "3\\\n",
+
         "[Section]\n"
         "setting1=1\\\\\\\n" /* continuation with trailing escape symbols */
         "\\\\2\n",           /* note that C requires one level of escaping, so the
@@ -322,6 +327,11 @@ static const char* const config_file[] = {
         x1000("ABCD") "\\\n"
         "foobar",
 
+        "[Section]\n"
+        "setting1="          /* a line above LINE_MAX length, with continuation */
+        x1000("ABCD") "\\\n" /* and an extra trailing backslash */
+        "foobar\\\n",
+
         "[Section]\n"
         "setting1="          /* a line above the allowed limit: 9 + 1050000 + 1 */
         x1000(x1000("x") x10("abcde")) "\n",
@@ -375,27 +385,27 @@ static void test_config_parse(unsigned i, const char *s) {
                 assert_se(streq(setting1, "1"));
                 break;
 
-        case 4:
+        case 4 ... 5:
                 assert_se(r == 0);
                 assert_se(streq(setting1, "1 2 3"));
                 break;
 
-        case 5:
+        case 6:
                 assert_se(r == 0);
                 assert_se(streq(setting1, "1\\\\ \\\\2"));
                 break;
 
-        case 6:
+        case 7:
                 assert_se(r == 0);
                 assert_se(streq(setting1, x1000("ABCD")));
                 break;
 
-        case 7:
+        case 8 ... 9:
                 assert_se(r == 0);
                 assert_se(streq(setting1, x1000("ABCD") " foobar"));
                 break;
 
-        case 8 ... 9:
+        case 10 ... 11:
                 assert_se(r == -ENOBUFS);
                 assert_se(setting1 == NULL);
                 break;