output: add some trivia data to json output

These are software version, dhcpd conf and leases paths and mtime epoch
timestamps.

Signed-off-by: Sami Kerola <kerolasa@iki.fi>

src/output.c

@@ -596,7 +596,19 @@ static int output_json(struct conf_t *state, const int print_mac_addreses)
 			fprintf(outfile, "         \"backup_percent\":%g,\n", oh.bup);
 		}
 		fprintf(outfile, "         \"status\":%d\n", oh.status);
-		fprintf(outfile, "   }");	/* end of summary */
+		fprintf(outfile, "   },\n");	/* end of summary */
+		fprintf(outfile, "   \"trivia\": {\n");
+		fprintf(outfile, "         \"version\":\"%s\",\n", PACKAGE_VERSION);
+		fprintf(outfile, "         \"conf_file_path\":\"%s\",\n", state->dhcpdconf_file);
+		fprintf(outfile, "         \"conf_file_epoch_mtime\":");
+		dp_time_tool(outfile, state->dhcpdconf_file, 1);
+		fprintf(outfile, ",\n");
+		fprintf(outfile, "         \"lease_file_path\":\"%s\",\n", state->dhcpdlease_file);
+		fprintf(outfile, "         \"lease_file_epoch_mtime\":");
+		dp_time_tool(outfile, state->dhcpdlease_file, 1);
+		fprintf(outfile, "\n");
+
+		fprintf(outfile, "   }");	/* end of trivia */
 	}
 	fprintf(outfile, "\n}\n");
 	close_outfile(outfile);

tests/expected/same-twice-json

@@ -17,5 +17,7 @@
          "touch_count":1,
          "touch_percent":10,
          "status":0
+   },
+   "trivia": {
    }
 }

tests/full-json

@@ -7,7 +7,8 @@ if [ ! -d tests/outputs ]; then
 fi
 
 dhcpd-pools -f J -c $top_srcdir/tests/confs/same-twice \
-		 -l $top_srcdir/tests/leases/same-twice \
-		 -o tests/outputs/same-twice-json
+		 -l $top_srcdir/tests/leases/same-twice |
+		sed '/"version":"/d; /"conf_file_.*":/d; /"lease_file_.*":/d' \
+		>| tests/outputs/same-twice-json
 diff -u $top_srcdir/tests/expected/same-twice-json tests/outputs/same-twice-json
 exit $?