mirror of
https://github.com/systemd/systemd.git
synced 2026-08-08 00:51:19 +00:00
systemctl: implement 'show' command
This commit is contained in:
Lennart Poettering
367
src/systemctl.c
367
src/systemctl.c
@@ -43,6 +43,7 @@
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#include "strv.h"
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static const char *arg_type = NULL;
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static const char *arg_property = NULL;
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static bool arg_all = false;
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static bool arg_replace = false;
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static bool arg_session = false;
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@@ -987,7 +988,332 @@ finish:
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dbus_error_free(&error);
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return r;
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}
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static int print_property(const char *name, DBusMessageIter *iter) {
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assert(name);
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assert(iter);
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if (arg_property && !streq(name, arg_property))
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return 0;
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switch (dbus_message_iter_get_arg_type(iter)) {
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case DBUS_TYPE_STRING: {
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const char *s;
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dbus_message_iter_get_basic(iter, &s);
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if (arg_all || s[0])
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printf("%s=%s\n", name, s);
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return 0;
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}
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case DBUS_TYPE_BOOLEAN: {
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dbus_bool_t b;
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dbus_message_iter_get_basic(iter, &b);
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printf("%s=%s\n", name, yes_no(b));
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return 0;
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}
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case DBUS_TYPE_UINT64: {
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uint64_t u;
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dbus_message_iter_get_basic(iter, &u);
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/* Yes, heuristics! But we can change this check
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* should it turn out to not be sufficient */
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if (strstr(name, "Timestamp")) {
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char timestamp[FORMAT_TIMESTAMP_MAX], *t;
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if ((t = format_timestamp(timestamp, sizeof(timestamp), u)) || arg_all)
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printf("%s=%s\n", name, strempty(t));
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} else
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printf("%s=%llu\n", name, (unsigned long long) u);
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return 0;
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}
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case DBUS_TYPE_UINT32: {
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uint32_t u;
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dbus_message_iter_get_basic(iter, &u);
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if (strstr(name, "UMask"))
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printf("%s=%04o\n", name, u);
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else
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printf("%s=%u\n", name, (unsigned) u);
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return 0;
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}
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case DBUS_TYPE_INT32: {
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int32_t i;
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dbus_message_iter_get_basic(iter, &i);
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printf("%s=%i\n", name, (int) i);
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return 0;
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}
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case DBUS_TYPE_STRUCT: {
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DBusMessageIter sub;
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dbus_message_iter_recurse(iter, &sub);
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if (dbus_message_iter_get_arg_type(&sub) == DBUS_TYPE_UINT32 && strstr(name, "Job")) {
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uint32_t u;
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dbus_message_iter_get_basic(&sub, &u);
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if (u)
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printf("%s=%u\n", name, (unsigned) u);
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else if (arg_all)
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printf("%s=\n", name);
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return 0;
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} else if (dbus_message_iter_get_arg_type(&sub) == DBUS_TYPE_STRING && strstr(name, "Unit")) {
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const char *s;
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dbus_message_iter_get_basic(&sub, &s);
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if (arg_all || s[0])
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printf("%s=%s\n", name, s);
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return 0;
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}
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break;
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}
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case DBUS_TYPE_ARRAY:
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if (dbus_message_iter_get_element_type(iter) == DBUS_TYPE_STRING) {
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DBusMessageIter sub;
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bool space = false;
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dbus_message_iter_recurse(iter, &sub);
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if (arg_all ||
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dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_INVALID) {
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printf("%s=", name);
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while (dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_INVALID) {
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const char *s;
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assert(dbus_message_iter_get_arg_type(&sub) == DBUS_TYPE_STRING);
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dbus_message_iter_get_basic(&sub, &s);
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printf("%s%s", space ? " " : "", s);
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space = true;
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dbus_message_iter_next(&sub);
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}
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puts("");
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}
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return 0;
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}
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break;
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}
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if (arg_all)
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printf("%s=[unprintable]\n", name);
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return 0;
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}
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static int show_one(DBusConnection *bus, const char *path) {
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DBusMessage *m = NULL, *reply = NULL;
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const char *interface = "";
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int r;
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DBusError error;
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DBusMessageIter iter, sub, sub2, sub3;
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assert(bus);
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assert(path);
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dbus_error_init(&error);
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if (!(m = dbus_message_new_method_call(
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"org.freedesktop.systemd1",
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path,
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"org.freedesktop.DBus.Properties",
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"GetAll"))) {
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log_error("Could not allocate message.");
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r = -ENOMEM;
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goto finish;
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}
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if (!dbus_message_append_args(m,
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DBUS_TYPE_STRING, &interface,
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DBUS_TYPE_INVALID)) {
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log_error("Could not append arguments to message.");
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r = -ENOMEM;
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goto finish;
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}
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if (!(reply = dbus_connection_send_with_reply_and_block(bus, m, -1, &error))) {
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log_error("Failed to issue method call: %s", error.message);
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r = -EIO;
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goto finish;
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}
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if (!dbus_message_iter_init(reply, &iter) ||
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dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_ARRAY ||
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dbus_message_iter_get_element_type(&iter) != DBUS_TYPE_DICT_ENTRY) {
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log_error("Failed to parse reply.");
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r = -EIO;
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goto finish;
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}
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dbus_message_iter_recurse(&iter, &sub);
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while (dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_INVALID) {
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const char *name;
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if (dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_DICT_ENTRY) {
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log_error("Failed to parse reply.");
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r = -EIO;
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goto finish;
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}
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dbus_message_iter_recurse(&sub, &sub2);
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if (bus_iter_get_basic_and_next(&sub2, DBUS_TYPE_STRING, &name, true) < 0) {
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log_error("Failed to parse reply.");
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r = -EIO;
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goto finish;
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}
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if (dbus_message_iter_get_arg_type(&sub2) != DBUS_TYPE_VARIANT) {
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log_error("Failed to parse reply.");
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r = -EIO;
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goto finish;
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}
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dbus_message_iter_recurse(&sub2, &sub3);
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if (print_property(name, &sub3) < 0) {
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log_error("Failed to parse reply.");
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r = -EIO;
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goto finish;
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}
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dbus_message_iter_next(&sub);
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}
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r = 0;
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finish:
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if (m)
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dbus_message_unref(m);
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if (reply)
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dbus_message_unref(reply);
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dbus_error_free(&error);
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return r;
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}
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static int show(DBusConnection *bus, char **args, unsigned n) {
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DBusMessage *m = NULL, *reply = NULL;
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int r;
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DBusError error;
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unsigned i;
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assert(bus);
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assert(args);
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dbus_error_init(&error);
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if (n <= 1) {
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/* If not argument is specified inspect the manager
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* itself */
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r = show_one(bus, "/org/freedesktop/systemd1");
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goto finish;
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}
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for (i = 1; i < n; i++) {
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const char *path = NULL;
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uint32_t id;
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if (safe_atou32(args[i], &id) < 0) {
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if (!(m = dbus_message_new_method_call(
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"org.freedesktop.systemd1",
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"/org/freedesktop/systemd1",
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"org.freedesktop.systemd1.Manager",
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"GetUnit"))) {
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log_error("Could not allocate message.");
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r = -ENOMEM;
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goto finish;
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}
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if (!dbus_message_append_args(m,
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DBUS_TYPE_STRING, &args[i],
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DBUS_TYPE_INVALID)) {
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log_error("Could not append arguments to message.");
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r = -ENOMEM;
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goto finish;
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}
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} else {
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if (!(m = dbus_message_new_method_call(
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"org.freedesktop.systemd1",
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"/org/freedesktop/systemd1",
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"org.freedesktop.systemd1.Manager",
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"GetJob"))) {
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log_error("Could not allocate message.");
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r = -ENOMEM;
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goto finish;
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}
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if (!dbus_message_append_args(m,
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DBUS_TYPE_UINT32, &id,
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DBUS_TYPE_INVALID)) {
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log_error("Could not append arguments to message.");
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r = -ENOMEM;
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goto finish;
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}
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}
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if (!(reply = dbus_connection_send_with_reply_and_block(bus, m, -1, &error))) {
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log_error("Failed to issue method call: %s", error.message);
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r = -EIO;
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goto finish;
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}
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if (!dbus_message_get_args(reply, &error,
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DBUS_TYPE_OBJECT_PATH, &path,
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DBUS_TYPE_INVALID)) {
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log_error("Failed to parse reply: %s", error.message);
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r = -EIO;
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goto finish;
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}
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if ((r = show_one(bus, path)) < 0)
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goto finish;
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dbus_message_unref(m);
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dbus_message_unref(reply);
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m = reply = NULL;
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}
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r = 0;
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finish:
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if (m)
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dbus_message_unref(m);
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if (reply)
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dbus_message_unref(reply);
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dbus_error_free(&error);
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return r;
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}
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static DBusHandlerResult monitor_filter(DBusConnection *connection, DBusMessage *message, void *data) {
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@@ -1656,27 +1982,29 @@ static int systemctl_help(void) {
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printf("%s [OPTIONS...] {COMMAND} ...\n\n"
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"Send control commands to the systemd manager.\n\n"
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" -h --help Show this help\n"
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" -t --type=TYPE List only units of a particular type\n"
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" -a --all Show all units, including dead ones\n"
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" --replace When installing a new job, replace existing conflicting ones\n"
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" --system Connect to system bus\n"
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" --session Connect to session bus\n"
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" -q --quiet Suppress output\n"
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" --no-block Do not wait until operation finished\n"
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" --no-wall Don't send wall message before halt/power-off/reboot\n\n"
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" -h --help Show this help\n"
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" -t --type=TYPE List only units of a particular type\n"
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" -p --property=NAME Show only property by this name\n"
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" -a --all Show all units/properties, including dead/empty ones\n"
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" --replace When installing a new job, replace existing conflicting ones\n"
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" --system Connect to system bus\n"
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" --session Connect to session bus\n"
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" -q --quiet Suppress output\n"
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" --no-block Do not wait until operation finished\n"
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" --no-wall Don't send wall message before halt/power-off/reboot\n\n"
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"Commands:\n"
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" list-units List units\n"
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" list-jobs List jobs\n"
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" clear-jobs Cancel all jobs\n"
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" load [NAME...] Load one or more units\n"
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" cancel [JOB...] Cancel one or more jobs\n"
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" start [NAME...] Start one or more units\n"
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" stop [NAME...] Stop one or more units\n"
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" restart [NAME...] Restart one or more units\n"
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" reload [NAME...] Reload one or more units\n"
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" isolate [NAME] Start one unit and stop all others\n"
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" check [NAME...] Check whether any of the passed units are active\n"
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" show [NAME...|JOB...] Show information about one or more units\n"
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" load [NAME...] Load one or more units\n"
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" list-jobs List jobs\n"
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" cancel [JOB...] Cancel one or more jobs\n"
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" clear-jobs Cancel all jobs\n"
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" monitor Monitor unit/job changes\n"
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" dump Dump server status\n"
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" snapshot [NAME] Create a snapshot\n"
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@@ -1776,6 +2104,7 @@ static int systemctl_parse_argv(int argc, char *argv[]) {
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static const struct option options[] = {
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{ "help", no_argument, NULL, 'h' },
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{ "type", required_argument, NULL, 't' },
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{ "property", required_argument, NULL, 'p' },
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{ "all", no_argument, NULL, 'a' },
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{ "replace", no_argument, NULL, ARG_REPLACE },
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{ "session", no_argument, NULL, ARG_SESSION },
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@@ -1791,7 +2120,7 @@ static int systemctl_parse_argv(int argc, char *argv[]) {
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assert(argc >= 0);
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assert(argv);
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while ((c = getopt_long(argc, argv, "htaq", options, NULL)) >= 0) {
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while ((c = getopt_long(argc, argv, "ht:p:aq", options, NULL)) >= 0) {
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switch (c) {
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@@ -1803,6 +2132,15 @@ static int systemctl_parse_argv(int argc, char *argv[]) {
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arg_type = optarg;
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break;
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case 'p':
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arg_property = optarg;
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/* If the user asked for a particular
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* property, show it to him, even if it is
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* empty. */
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arg_all = true;
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break;
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case 'a':
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arg_all = true;
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break;
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@@ -2343,6 +2681,7 @@ static int systemctl_main(DBusConnection *bus, int argc, char *argv[]) {
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{ "restart", MORE, 2, start_unit },
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{ "isolate", EQUAL, 2, start_unit },
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{ "check", MORE, 2, check_unit },
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{ "show", MORE, 1, show },
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{ "monitor", EQUAL, 1, monitor },
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{ "dump", EQUAL, 1, dump },
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{ "snapshot", LESS, 2, snapshot },
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