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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include "bus-error.h"
#include "bus-locator.h"
#include "systemctl.h"
#include "systemctl-util.h"
#include "systemctl-whoami.h"
#include "parse-util.h"
static int lookup_pid(sd_bus *bus, pid_t pid) {
_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
_cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
_cleanup_free_ char *unit = NULL;
const char *path;
int r;
r = bus_call_method(bus, bus_systemd_mgr, "GetUnitByPID", &error, &reply, "u", (uint32_t) pid);
if (r < 0)
return log_error_errno(r, "Failed to get unit for ourselves: %s", bus_error_message(&error, r));
r = sd_bus_message_read(reply, "o", &path);
if (r < 0)
return bus_log_parse_error(r);
r = unit_name_from_dbus_path(path, &unit);
if (r < 0)
return log_error_errno(r, "Failed to extract unit name from D-Bus object path '%s': %m", path);
printf("%s\n", unit);
return 0;
}
int verb_whoami(int argc, char *argv[], void *userdata) {
sd_bus *bus;
int r;
r = acquire_bus(BUS_FULL, &bus);
if (r < 0)
return r;
char **pids = strv_skip(argv, 1);
if (strv_isempty(pids)) {
if (arg_transport != BUS_TRANSPORT_LOCAL)
return log_error_errno(SYNTHETIC_ERRNO(EREMOTE), "Refusing to look up local PID on remote host.");
return lookup_pid(bus, 0);
} else {
int ret = 0;
STRV_FOREACH(p, pids) {
pid_t pid;
r = parse_pid(*p, &pid);
if (r < 0) {
log_error_errno(r, "Failed to parse PID: %s", *p);
if (ret >= 0)
ret = r;
continue;
}
r = lookup_pid(bus, pid);
if (r < 0 && ret >= 0)
ret = r;
}
return ret;
}
}
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