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analyze: Do no require a full d-bus bus for the plot command (#8539)

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The plot command requires a full d-bus bus to fetch the host
information, which seems rather optional, and having a running dbus
daemon is not always desirable. So instead, we try to acquire a full
bus, and if that fails we acquire the systemd bus, in which case we
omit the host information from the output.

We refactor acquire_bus() into two new functions which in addition
makes the call sites clearer.
This commit is contained in:
Guillem Jover 2018-04-07 20:02:20 +02:00 committed by Zbigniew Jędrzejewski-Szmek
parent e438c57a64
commit 5c69b31c13
1 changed files with 42 additions and 27 deletions
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69
src/analyze/analyze.c
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@ -131,13 +131,24 @@ struct host_info {
char *architecture;
};
static int acquire_bus(bool need_full_bus, sd_bus **bus) {
static int acquire_systemd_bus(sd_bus **bus) {
bool user = arg_scope != UNIT_FILE_SYSTEM;
if (need_full_bus)
return bus_connect_transport(arg_transport, arg_host, user, bus);
else
return bus_connect_transport_systemd(arg_transport, arg_host, user, bus);
return bus_connect_transport_systemd(arg_transport, arg_host, user, bus);
}
static int acquire_full_bus(bool *use_full_bus, sd_bus **bus) {
bool user = arg_scope != UNIT_FILE_SYSTEM;
if (*use_full_bus) {
if (bus_connect_transport(arg_transport, arg_host, user, bus) == 0)
return 0;
*use_full_bus = false;
}
return acquire_systemd_bus(bus);
}
static int bus_get_uint64_property(sd_bus *bus, const char *path, const char *interface, const char *property, uint64_t *val) {
@ -601,11 +612,12 @@ static int analyze_plot(int argc, char *argv[], void *userdata) {
struct unit_times *times;
struct boot_times *boot;
int n, m = 1, y = 0, r;
bool use_full_bus = true;
double width;
_cleanup_free_ char *pretty_times = NULL;
struct unit_times *u;
r = acquire_bus(true, &bus);
r = acquire_full_bus(&use_full_bus, &bus);
if (r < 0)
return log_error_errno(r, "Failed to create bus connection: %m");
@ -617,9 +629,11 @@ static int analyze_plot(int argc, char *argv[], void *userdata) {
if (n < 0)
return n;
n = acquire_host_info(bus, &host);
if (n < 0)
return n;
if (use_full_bus) {
n = acquire_host_info(bus, &host);
if (n < 0)
return n;
}
n = acquire_time_data(bus, &times);
if (n <= 0)
@ -717,14 +731,15 @@ static int analyze_plot(int argc, char *argv[], void *userdata) {
svg("<rect class=\"background\" width=\"100%%\" height=\"100%%\" />\n");
svg("<text x=\"20\" y=\"50\">%s</text>", pretty_times);
svg("<text x=\"20\" y=\"30\">%s %s (%s %s %s) %s %s</text>",
isempty(host->os_pretty_name) ? "Linux" : host->os_pretty_name,
strempty(host->hostname),
strempty(host->kernel_name),
strempty(host->kernel_release),
strempty(host->kernel_version),
strempty(host->architecture),
strempty(host->virtualization));
if (use_full_bus)
svg("<text x=\"20\" y=\"30\">%s %s (%s %s %s) %s %s</text>",
isempty(host->os_pretty_name) ? "Linux" : host->os_pretty_name,
strempty(host->hostname),
strempty(host->kernel_name),
strempty(host->kernel_release),
strempty(host->kernel_version),
strempty(host->architecture),
strempty(host->virtualization));
svg("<g transform=\"translate(%.3f,100)\">\n", 20.0 + (SCALE_X * boot->firmware_time));
svg_graph_box(m, -(double) boot->firmware_time, boot->finish_time);
@ -1011,7 +1026,7 @@ static int analyze_critical_chain(int argc, char *argv[], void *userdata) {
Hashmap *h;
int n, r;
r = acquire_bus(false, &bus);
r = acquire_systemd_bus(&bus);
if (r < 0)
return log_error_errno(r, "Failed to create bus connection: %m");
@ -1053,7 +1068,7 @@ static int analyze_blame(int argc, char *argv[], void *userdata) {
unsigned i;
int n, r;
r = acquire_bus(false, &bus);
r = acquire_systemd_bus(&bus);
if (r < 0)
return log_error_errno(r, "Failed to create bus connection: %m");
@ -1081,7 +1096,7 @@ static int analyze_time(int argc, char *argv[], void *userdata) {
_cleanup_free_ char *buf = NULL;
int r;
r = acquire_bus(false, &bus);
r = acquire_systemd_bus(&bus);
if (r < 0)
return log_error_errno(r, "Failed to create bus connection: %m");
@ -1215,7 +1230,7 @@ static int dot(int argc, char *argv[], void *userdata) {
int r;
UnitInfo u;
r = acquire_bus(false, &bus);
r = acquire_systemd_bus(&bus);
if (r < 0)
return log_error_errno(r, "Failed to create bus connection: %m");
@ -1282,7 +1297,7 @@ static int dump(int argc, char *argv[], void *userdata) {
const char *text = NULL;
int r;
r = acquire_bus(false, &bus);
r = acquire_systemd_bus(&bus);
if (r < 0)
return log_error_errno(r, "Failed to create bus connection: %m");
@ -1316,7 +1331,7 @@ static int set_log_level(int argc, char *argv[], void *userdata) {
assert(argc == 2);
assert(argv);
r = acquire_bus(false, &bus);
r = acquire_systemd_bus(&bus);
if (r < 0)
return log_error_errno(r, "Failed to create bus connection: %m");
@ -1341,7 +1356,7 @@ static int get_log_level(int argc, char *argv[], void *userdata) {
_cleanup_free_ char *level = NULL;
int r;
r = acquire_bus(false, &bus);
r = acquire_systemd_bus(&bus);
if (r < 0)
return log_error_errno(r, "Failed to create bus connection: %m");
@ -1372,7 +1387,7 @@ static int set_log_target(int argc, char *argv[], void *userdata) {
assert(argc == 2);
assert(argv);
r = acquire_bus(false, &bus);
r = acquire_systemd_bus(&bus);
if (r < 0)
return log_error_errno(r, "Failed to create bus connection: %m");
@ -1397,7 +1412,7 @@ static int get_log_target(int argc, char *argv[], void *userdata) {
_cleanup_free_ char *target = NULL;
int r;
r = acquire_bus(false, &bus);
r = acquire_systemd_bus(&bus);
if (r < 0)
return log_error_errno(r, "Failed to create bus connection: %m");
@ -1559,7 +1574,7 @@ static int service_watchdogs(int argc, char *argv[], void *userdata) {
assert(IN_SET(argc, 1, 2));
assert(argv);
r = acquire_bus(false, &bus);
r = acquire_systemd_bus(&bus);
if (r < 0)
return log_error_errno(r, "Failed to create bus connection: %m");