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cgls: add --unit to show units
$ systemd-cgls -u systemd-journald.service machine.slice I opted for a "global" switch, instead of modifying the behaviour of just one argument. It seem to be a more useful setting, since usually one will want to query one or more units, and not mix unit names with paths. Closes #5156.
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@ -54,6 +54,12 @@
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<arg choice="opt" rep="repeat">OPTIONS</arg>
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<arg choice="opt" rep="repeat">CGROUP</arg>
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</cmdsynopsis>
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<cmdsynopsis>
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<command>systemd-cgls</command>
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<arg choice="opt" rep="repeat">OPTIONS</arg>
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<arg choice="plain"><option>--unit</option></arg>
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<arg choice="opt" rep="repeat">UNIT</arg>
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</cmdsynopsis>
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</refsynopsisdiv>
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<refsect1>
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@ -95,6 +101,14 @@
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-u</option></term>
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<term><option>--unit</option></term>
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<listitem><para>Show cgroup subtrees for the specified units.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-k</option></term>
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@ -40,6 +40,7 @@
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static bool arg_no_pager = false;
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static bool arg_kernel_threads = false;
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static bool arg_all = false;
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static bool arg_unit = false;
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static int arg_full = -1;
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static char* arg_machine = NULL;
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@ -50,6 +51,7 @@ static void help(void) {
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" --version Show package version\n"
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" --no-pager Do not pipe output into a pager\n"
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" -a --all Show all groups, including empty\n"
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" -u --unit Show the subtrees of specifified units\n"
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" -l --full Do not ellipsize output\n"
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" -k Include kernel threads in output\n"
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" -M --machine= Show container\n"
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@ -70,6 +72,7 @@ static int parse_argv(int argc, char *argv[]) {
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{ "all", no_argument, NULL, 'a' },
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{ "full", no_argument, NULL, 'l' },
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{ "machine", required_argument, NULL, 'M' },
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{ "unit", no_argument, NULL, 'u' },
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{}
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};
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@ -78,7 +81,7 @@ static int parse_argv(int argc, char *argv[]) {
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assert(argc >= 1);
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assert(argv);
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while ((c = getopt_long(argc, argv, "hkalM:", options, NULL)) >= 0)
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while ((c = getopt_long(argc, argv, "hkalM:u", options, NULL)) >= 0)
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switch (c) {
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@ -97,6 +100,10 @@ static int parse_argv(int argc, char *argv[]) {
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arg_all = true;
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break;
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case 'u':
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arg_unit = true;
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break;
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case 'l':
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arg_full = true;
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break;
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@ -116,6 +123,11 @@ static int parse_argv(int argc, char *argv[]) {
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assert_not_reached("Unhandled option");
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}
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if (arg_machine && arg_unit) {
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log_error("Cannot combine --unit with --machine.");
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return -EINVAL;
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}
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return 1;
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}
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@ -150,17 +162,42 @@ int main(int argc, char *argv[]) {
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arg_kernel_threads * OUTPUT_KERNEL_THREADS;
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if (optind < argc) {
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_cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
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_cleanup_free_ char *root = NULL;
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int i;
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r = show_cgroup_get_path_and_warn(arg_machine, NULL, &root);
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if (r < 0)
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goto finish;
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for (i = optind; i < argc; i++) {
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int q;
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if (path_startswith(argv[i], "/sys/fs/cgroup")) {
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if (arg_unit) {
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/* Command line arguments are unit names */
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_cleanup_free_ char *cgroup = NULL;
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if (!bus) {
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/* Connect to the bus only if necessary */
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r = bus_connect_transport_systemd(BUS_TRANSPORT_LOCAL, NULL, false, &bus);
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if (r < 0) {
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log_error_errno(r, "Failed to create bus connection: %m");
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goto finish;
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}
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}
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q = show_cgroup_get_unit_path_and_warn(bus, argv[i], &cgroup);
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if (q < 0)
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goto failed;
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if (isempty(cgroup)) {
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log_warning("Unit %s not found.", argv[i]);
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q = -ENOENT;
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goto failed;
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}
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printf("Unit %s (%s):\n", argv[i], cgroup);
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fflush(stdout);
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q = show_cgroup_by_path(cgroup, NULL, 0, output_flags);
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} else if (path_startswith(argv[i], "/sys/fs/cgroup")) {
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printf("Directory %s:\n", argv[i]);
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fflush(stdout);
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@ -170,10 +207,17 @@ int main(int argc, char *argv[]) {
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_cleanup_free_ char *c = NULL, *p = NULL, *j = NULL;
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const char *controller, *path;
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if (!root) {
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/* Query root only if needed, treat error as fatal */
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r = show_cgroup_get_path_and_warn(arg_machine, NULL, &root);
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if (r < 0)
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goto finish;
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}
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r = cg_split_spec(argv[i], &c, &p);
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if (r < 0) {
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log_error_errno(r, "Failed to split argument %s: %m", argv[i]);
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goto finish;
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goto failed;
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}
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controller = c ?: SYSTEMD_CGROUP_CONTROLLER;
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@ -194,7 +238,8 @@ int main(int argc, char *argv[]) {
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q = show_cgroup(controller, path, NULL, 0, output_flags);
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}
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if (q < 0)
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failed:
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if (q < 0 && r >= 0)
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r = q;
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}
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