Sorry for the late reply.  I didn't see there was a reply to the report
(I'm not subscribed to this list... I check the archives from time to
time though.)

> This shouldn't be the case, as GNUnet picks up the (default) service
> contact information from a the share/gnunet/config.d/ directory.
>
> Also, when I change the value, everything still works for me. What is
> the error message you are seeing (if any)?

The problem is in 3rd-party applications.  GNUnet itself correctly reads
its config files from the correct directories.  However, if the
GNUNET_OS_ProjectData structure holds different values, the application
doesn't work.

The main problem is that it can't connect to GNUnet services, so the
error is that `GNUNET_CLIENT_connect' returns NULL when making a
connection.

For a concrete error message, using `GNUNET_IDENTITY_ego_lookup' (which
makes an implicit connection to the IDENTITY service) when .config_file
and .user_config_file are different from "gnunet.conf" and
"~/.config/gnunet.conf" respectively, it fails with the following
message:

ERROR Assertion failed at identity_api_lookup.c:202.

The line in question is a `GNUNET_break' called when
`GNUNET_CLIENT_connect' returns NULL.

The error does not happen if the configuration file (either one, as long
as it exists) is the same as GNUnet itself.

I attached a minimal program for testing this issue.  It simply calls
`GNUNET_IDENTITY_ego_lookup'.  If it successfully connects, it will
print wether or not the ego "test-ego" exists; otherwise, it will fail
with the above message.

Thanks,
A.V.

#include <netinet/in.h>
#define SOCKTYPE int
#define FDTYPE int

#include <gnunet/gnunet_util_lib.h>
#include <gnunet/gnunet_identity_service.h>

static struct GNUNET_OS_ProjectData test_pd = {
     .libname = "test",
     .project_dirname = "test",
     .binary_name = "test-config",
     .env_varname = "TEST_PREFIX",
     .base_config_varname = "TEST_CONFIG",
     .bug_email = "",
     .homepage = "",
     .config_file = "test.conf",
     .user_config_file = "/tmp/test.conf",
     .version = "1.0",
     .is_gnu = 0,
     .gettext_domain = "test",
     .gettext_path = NULL,
};

static const struct GNUNET_CONFIGURATION_Handle *cfg = NULL;

static void
ego_lookup(void *cls, const struct GNUNET_IDENTITY_Ego *ego) {
     if (ego == NULL) {
	  GNUNET_log(GNUNET_ERROR_TYPE_INFO, "test-ego does not exist\n");
     } else {
	  GNUNET_log(GNUNET_ERROR_TYPE_INFO, "test-ego exists\n");
     }
     GNUNET_SCHEDULER_shutdown();
}

static void
run(void *cls, char *const *args, const char *cfgname,
    const struct GNUNET_CONFIGURATION_Handle *c) {
     GNUNET_log_setup("test-config", "INFO", NULL);
     
     cfg = c;

     if (GNUNET_IDENTITY_ego_lookup(cfg, "test-ego", &ego_lookup, NULL) == NULL) {
	  GNUNET_log(GNUNET_ERROR_TYPE_ERROR, "Error with ego lookup\n");
	  GNUNET_SCHEDULER_shutdown();
     }
}

int
main(int argc, char *argv[]) {
     const struct GNUNET_GETOPT_CommandLineOption opts[] = {
	  GNUNET_GETOPT_OPTION_END,
     };
     
     GNUNET_OS_init(&test_pd);

     return (GNUNET_PROGRAM_run(argc, argv, "test-config",
				"test", opts, &run, NULL)
	     != GNUNET_OK);
}
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