Improve error diagnostics.

When parsing the command line options we must not error out if a
required option was not given because that option might be specified
in the config file. Therefore we have to call cmdline_parser_ext()
with params->check_required = 0.

However, if --config-file is not given and the default config file
(~/.dssrc) does not exist, we end up with no check for required
options at all.

In particular, if the required --dest-dir option is not given,
conf.dest_dir is NULL and we call chdir(NULL) which returns EBADADRESS
at least on Linux. This causes dss to print the error message

	Aug 28 11:35:07 main: Bad address

which is not really helpful. Fix this shortcoming by calling
cmdline_parser_ext() _again_ if no config file was read by
parse_config_file(). This second call uses params->check_required =
1, so that a proper error message is printed if any required options
are missing.

In the above example, the output changes to

	./dss: '--source-dir' option required
	./dss: '--dest-dir' option required

which is much better.

diff --git a/dss.c b/dss.c
index 04fe30c4bb7798ae8a049b9eb46638b278ea3927..a233c11f7060c0321502c35e555df78ef0b3931b 100644 (file)
--- a/dss.c
+++ b/dss.c
@@ -818,9 +818,13 @@ static int check_config(void)
        return 1;
 }
 
+/*
+ * Returns < 0 on errors, 0 if no config file is given and > 0 if the config
+ * file was read successfully.
+ */
 static int parse_config_file(int override)
 {
-       int ret;
+       int ret, config_file_exists;
        char *config_file;
        struct stat statbuf;
        char *old_logfile_arg = NULL;
@@ -839,13 +843,13 @@ static int parse_config_file(int override)
                old_daemon_given = conf.daemon_given;
        }
 
-       ret = stat(config_file, &statbuf);
-       if (ret && conf.config_file_given) {
+       config_file_exists = !stat(config_file, &statbuf);
+       if (!config_file_exists && conf.config_file_given) {
                ret = -ERRNO_TO_DSS_ERROR(errno);
                DSS_ERROR_LOG("failed to stat config file %s\n", config_file);
                goto out;
        }
-       if (!ret) {
+       if (config_file_exists) {
                struct cmdline_parser_params params = {
                        .override = override,
                        .initialize = 0,
@@ -885,6 +889,7 @@ static int parse_config_file(int override)
        }
        DSS_DEBUG_LOG("loglevel: %d\n", conf.loglevel_arg);
 //     cmdline_parser_dump(logfile? logfile : stdout, &conf);
+       ret = config_file_exists;
 out:
        free(config_file);
        if (ret < 0)
@@ -1294,6 +1299,20 @@ int main(int argc, char **argv)
        ret = parse_config_file(0);
        if (ret < 0)
                goto out;
+       if (ret == 0) { /* no config file given */
+               /*
+                * Parse the command line options again, but this time check
+                * that all required options are given.
+                */
+               params = (struct cmdline_parser_params) {
+                       .override = 1,
+                       .initialize = 1,
+                       .check_required = 1,
+                       .check_ambiguity = 1,
+                       .print_errors = 1
+               };
+               cmdline_parser_ext(argc, argv, &conf, &params); /* aborts on errors */
+       }
        if (conf.daemon_given)
                daemon_init();
        ret = change_to_dest_dir();