summaryrefslogtreecommitdiffstats
path: root/src/analyze/analyze-dot.c
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--src/analyze/analyze-dot.c182
1 files changed, 182 insertions, 0 deletions
diff --git a/src/analyze/analyze-dot.c b/src/analyze/analyze-dot.c
new file mode 100644
index 0000000..bf8aa81
--- /dev/null
+++ b/src/analyze/analyze-dot.c
@@ -0,0 +1,182 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include "analyze.h"
+#include "analyze-dot.h"
+#include "bus-error.h"
+#include "bus-locator.h"
+#include "bus-unit-util.h"
+#include "glob-util.h"
+#include "terminal-util.h"
+
+static int graph_one_property(
+ sd_bus *bus,
+ const UnitInfo *u,
+ const char *prop,
+ const char *color,
+ char *patterns[],
+ char *from_patterns[],
+ char *to_patterns[]) {
+
+ _cleanup_strv_free_ char **units = NULL;
+ bool match_patterns;
+ int r;
+
+ assert(u);
+ assert(prop);
+ assert(color);
+
+ match_patterns = strv_fnmatch(patterns, u->id);
+
+ if (!strv_isempty(from_patterns) && !match_patterns && !strv_fnmatch(from_patterns, u->id))
+ return 0;
+
+ r = bus_get_unit_property_strv(bus, u->unit_path, prop, &units);
+ if (r < 0)
+ return r;
+
+ STRV_FOREACH(unit, units) {
+ bool match_patterns2;
+
+ match_patterns2 = strv_fnmatch(patterns, *unit);
+
+ if (!strv_isempty(to_patterns) && !match_patterns2 && !strv_fnmatch(to_patterns, *unit))
+ continue;
+
+ if (!strv_isempty(patterns) && !match_patterns && !match_patterns2)
+ continue;
+
+ printf("\t\"%s\"->\"%s\" [color=\"%s\"];\n", u->id, *unit, color);
+ }
+
+ return 0;
+}
+
+static int graph_one(sd_bus *bus, const UnitInfo *u, char *patterns[], char *from_patterns[], char *to_patterns[]) {
+ int r;
+
+ assert(bus);
+ assert(u);
+
+ if (IN_SET(arg_dot, DEP_ORDER, DEP_ALL)) {
+ r = graph_one_property(bus, u, "After", "green", patterns, from_patterns, to_patterns);
+ if (r < 0)
+ return r;
+ }
+
+ if (IN_SET(arg_dot, DEP_REQUIRE, DEP_ALL)) {
+ r = graph_one_property(bus, u, "Requires", "black", patterns, from_patterns, to_patterns);
+ if (r < 0)
+ return r;
+ r = graph_one_property(bus, u, "Requisite", "darkblue", patterns, from_patterns, to_patterns);
+ if (r < 0)
+ return r;
+ r = graph_one_property(bus, u, "Wants", "grey66", patterns, from_patterns, to_patterns);
+ if (r < 0)
+ return r;
+ r = graph_one_property(bus, u, "Conflicts", "red", patterns, from_patterns, to_patterns);
+ if (r < 0)
+ return r;
+ }
+
+ return 0;
+}
+
+static int expand_patterns(sd_bus *bus, char **patterns, char ***ret) {
+ _cleanup_strv_free_ char **expanded_patterns = NULL;
+ int r;
+
+ STRV_FOREACH(pattern, patterns) {
+ _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
+ _cleanup_free_ char *unit = NULL, *unit_id = NULL;
+
+ if (strv_extend(&expanded_patterns, *pattern) < 0)
+ return log_oom();
+
+ if (string_is_glob(*pattern))
+ continue;
+
+ unit = unit_dbus_path_from_name(*pattern);
+ if (!unit)
+ return log_oom();
+
+ r = sd_bus_get_property_string(
+ bus,
+ "org.freedesktop.systemd1",
+ unit,
+ "org.freedesktop.systemd1.Unit",
+ "Id",
+ &error,
+ &unit_id);
+ if (r < 0)
+ return log_error_errno(r, "Failed to get ID: %s", bus_error_message(&error, r));
+
+ if (!streq(*pattern, unit_id)) {
+ if (strv_extend(&expanded_patterns, unit_id) < 0)
+ return log_oom();
+ }
+ }
+
+ *ret = TAKE_PTR(expanded_patterns); /* do not free */
+
+ return 0;
+}
+
+int verb_dot(int argc, char *argv[], void *userdata) {
+ _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
+ _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
+ _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
+ _cleanup_strv_free_ char **expanded_patterns = NULL;
+ _cleanup_strv_free_ char **expanded_from_patterns = NULL;
+ _cleanup_strv_free_ char **expanded_to_patterns = NULL;
+ int r;
+ UnitInfo u;
+
+ r = acquire_bus(&bus, NULL);
+ if (r < 0)
+ return bus_log_connect_error(r, arg_transport);
+
+ r = expand_patterns(bus, strv_skip(argv, 1), &expanded_patterns);
+ if (r < 0)
+ return r;
+
+ r = expand_patterns(bus, arg_dot_from_patterns, &expanded_from_patterns);
+ if (r < 0)
+ return r;
+
+ r = expand_patterns(bus, arg_dot_to_patterns, &expanded_to_patterns);
+ if (r < 0)
+ return r;
+
+ r = bus_call_method(bus, bus_systemd_mgr, "ListUnits", &error, &reply, NULL);
+ if (r < 0)
+ return log_error_errno(r, "Failed to list units: %s", bus_error_message(&error, r));
+
+ r = sd_bus_message_enter_container(reply, SD_BUS_TYPE_ARRAY, "(ssssssouso)");
+ if (r < 0)
+ return bus_log_parse_error(r);
+
+ printf("digraph systemd {\n");
+
+ while ((r = bus_parse_unit_info(reply, &u)) > 0) {
+
+ r = graph_one(bus, &u, expanded_patterns, expanded_from_patterns, expanded_to_patterns);
+ if (r < 0)
+ return r;
+ }
+ if (r < 0)
+ return bus_log_parse_error(r);
+
+ printf("}\n");
+
+ log_info(" Color legend: black = Requires\n"
+ " dark blue = Requisite\n"
+ " dark grey = Wants\n"
+ " red = Conflicts\n"
+ " green = After\n");
+
+ if (on_tty() && !arg_quiet)
+ log_notice("-- You probably want to process this output with graphviz' dot tool.\n"
+ "-- Try a shell pipeline like 'systemd-analyze dot | dot -Tsvg > systemd.svg'!\n");
+
+ return 0;
+}