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-rw-r--r--src/shared/cgroup-show.c496
1 files changed, 496 insertions, 0 deletions
diff --git a/src/shared/cgroup-show.c b/src/shared/cgroup-show.c
new file mode 100644
index 0000000..e34a68e
--- /dev/null
+++ b/src/shared/cgroup-show.c
@@ -0,0 +1,496 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <dirent.h>
+#include <errno.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "alloc-util.h"
+#include "bus-error.h"
+#include "bus-util.h"
+#include "cgroup-show.h"
+#include "cgroup-util.h"
+#include "env-file.h"
+#include "escape.h"
+#include "fd-util.h"
+#include "format-util.h"
+#include "hostname-util.h"
+#include "locale-util.h"
+#include "macro.h"
+#include "nulstr-util.h"
+#include "output-mode.h"
+#include "parse-util.h"
+#include "path-util.h"
+#include "process-util.h"
+#include "sort-util.h"
+#include "string-util.h"
+#include "terminal-util.h"
+#include "unit-name.h"
+#include "xattr-util.h"
+
+static void show_pid_array(
+ pid_t pids[],
+ unsigned n_pids,
+ const char *prefix,
+ size_t n_columns,
+ bool extra,
+ bool more,
+ OutputFlags flags) {
+
+ unsigned i, j, pid_width;
+
+ if (n_pids == 0)
+ return;
+
+ typesafe_qsort(pids, n_pids, pid_compare_func);
+
+ /* Filter duplicates */
+ for (j = 0, i = 1; i < n_pids; i++) {
+ if (pids[i] == pids[j])
+ continue;
+ pids[++j] = pids[i];
+ }
+ n_pids = j + 1;
+ pid_width = DECIMAL_STR_WIDTH(pids[j]);
+
+ if (flags & OUTPUT_FULL_WIDTH)
+ n_columns = SIZE_MAX;
+ else {
+ if (n_columns > pid_width + 3) /* something like "├─1114784 " */
+ n_columns -= pid_width + 3;
+ else
+ n_columns = 20;
+ }
+ for (i = 0; i < n_pids; i++) {
+ _cleanup_free_ char *t = NULL;
+
+ (void) get_process_cmdline(pids[i], n_columns,
+ PROCESS_CMDLINE_COMM_FALLBACK | PROCESS_CMDLINE_USE_LOCALE,
+ &t);
+
+ if (extra)
+ printf("%s%s ", prefix, special_glyph(SPECIAL_GLYPH_TRIANGULAR_BULLET));
+ else
+ printf("%s%s", prefix, special_glyph(((more || i < n_pids-1) ? SPECIAL_GLYPH_TREE_BRANCH : SPECIAL_GLYPH_TREE_RIGHT)));
+
+ printf("%s%*"PID_PRI" %s%s\n", ansi_grey(), (int) pid_width, pids[i], strna(t), ansi_normal());
+ }
+}
+
+static int show_cgroup_one_by_path(
+ const char *path,
+ const char *prefix,
+ size_t n_columns,
+ bool more,
+ OutputFlags flags) {
+
+ _cleanup_free_ pid_t *pids = NULL;
+ _cleanup_fclose_ FILE *f = NULL;
+ _cleanup_free_ char *p = NULL;
+ size_t n = 0;
+ char *fn;
+ int r;
+
+ r = cg_mangle_path(path, &p);
+ if (r < 0)
+ return r;
+
+ fn = strjoina(p, "/cgroup.procs");
+ f = fopen(fn, "re");
+ if (!f)
+ return -errno;
+
+ for (;;) {
+ pid_t pid;
+
+ /* libvirt / qemu uses threaded mode and cgroup.procs cannot be read at the lower levels.
+ * From https://docs.kernel.org/admin-guide/cgroup-v2.html#threads,
+ * “cgroup.procs” in a threaded domain cgroup contains the PIDs of all processes in
+ * the subtree and is not readable in the subtree proper. */
+ r = cg_read_pid(f, &pid);
+ if (IN_SET(r, 0, -EOPNOTSUPP))
+ break;
+ if (r < 0)
+ return r;
+
+ if (!(flags & OUTPUT_KERNEL_THREADS) && is_kernel_thread(pid) > 0)
+ continue;
+
+ if (!GREEDY_REALLOC(pids, n + 1))
+ return -ENOMEM;
+
+ pids[n++] = pid;
+ }
+
+ show_pid_array(pids, n, prefix, n_columns, false, more, flags);
+
+ return 0;
+}
+
+static int is_delegated(int cgfd, const char *path) {
+ _cleanup_free_ char *b = NULL;
+ int r;
+
+ assert(cgfd >= 0 || path);
+
+ r = getxattr_malloc(cgfd < 0 ? path : FORMAT_PROC_FD_PATH(cgfd), "trusted.delegate", &b);
+ if (r < 0 && ERRNO_IS_XATTR_ABSENT(r)) {
+ /* If the trusted xattr isn't set (preferred), then check the untrusted one. Under the
+ * assumption that whoever is trusted enough to own the cgroup, is also trusted enough to
+ * decide if it is delegated or not this should be safe. */
+ r = getxattr_malloc(cgfd < 0 ? path : FORMAT_PROC_FD_PATH(cgfd), "user.delegate", &b);
+ if (r < 0 && ERRNO_IS_XATTR_ABSENT(r))
+ return false;
+ }
+ if (r < 0)
+ return log_debug_errno(r, "Failed to read delegate xattr, ignoring: %m");
+
+ r = parse_boolean(b);
+ if (r < 0)
+ return log_debug_errno(r, "Failed to parse delegate xattr boolean value, ignoring: %m");
+
+ return r;
+}
+
+static int show_cgroup_name(
+ const char *path,
+ const char *prefix,
+ SpecialGlyph glyph,
+ OutputFlags flags) {
+
+ uint64_t cgroupid = UINT64_MAX;
+ _cleanup_free_ char *b = NULL;
+ _cleanup_close_ int fd = -1;
+ bool delegate;
+ int r;
+
+ if (FLAGS_SET(flags, OUTPUT_CGROUP_XATTRS) || FLAGS_SET(flags, OUTPUT_CGROUP_ID)) {
+ fd = open(path, O_PATH|O_CLOEXEC|O_NOFOLLOW|O_DIRECTORY, 0);
+ if (fd < 0)
+ log_debug_errno(errno, "Failed to open cgroup '%s', ignoring: %m", path);
+ }
+
+ delegate = is_delegated(fd, path) > 0;
+
+ if (FLAGS_SET(flags, OUTPUT_CGROUP_ID)) {
+ cg_file_handle fh = CG_FILE_HANDLE_INIT;
+ int mnt_id = -1;
+
+ if (name_to_handle_at(
+ fd < 0 ? AT_FDCWD : fd,
+ fd < 0 ? path : "",
+ &fh.file_handle,
+ &mnt_id,
+ fd < 0 ? 0 : AT_EMPTY_PATH) < 0)
+ log_debug_errno(errno, "Failed to determine cgroup ID of %s, ignoring: %m", path);
+ else
+ cgroupid = CG_FILE_HANDLE_CGROUPID(fh);
+ }
+
+ r = path_extract_filename(path, &b);
+ if (r < 0)
+ return log_error_errno(r, "Failed to extract filename from cgroup path: %m");
+
+ printf("%s%s%s%s%s",
+ prefix, special_glyph(glyph),
+ delegate ? ansi_underline() : "",
+ cg_unescape(b),
+ delegate ? ansi_normal() : "");
+
+ if (delegate)
+ printf(" %s%s%s",
+ ansi_highlight(),
+ special_glyph(SPECIAL_GLYPH_ELLIPSIS),
+ ansi_normal());
+
+ if (cgroupid != UINT64_MAX)
+ printf(" %s(#%" PRIu64 ")%s", ansi_grey(), cgroupid, ansi_normal());
+
+ printf("\n");
+
+ if (FLAGS_SET(flags, OUTPUT_CGROUP_XATTRS) && fd >= 0) {
+ _cleanup_free_ char *nl = NULL;
+ char *xa;
+
+ r = flistxattr_malloc(fd, &nl);
+ if (r < 0)
+ log_debug_errno(r, "Failed to enumerate xattrs on '%s', ignoring: %m", path);
+
+ NULSTR_FOREACH(xa, nl) {
+ _cleanup_free_ char *x = NULL, *y = NULL, *buf = NULL;
+ int n;
+
+ if (!STARTSWITH_SET(xa, "user.", "trusted."))
+ continue;
+
+ n = fgetxattr_malloc(fd, xa, &buf);
+ if (n < 0) {
+ log_debug_errno(r, "Failed to read xattr '%s' off '%s', ignoring: %m", xa, path);
+ continue;
+ }
+
+ x = cescape(xa);
+ if (!x)
+ return -ENOMEM;
+
+ y = cescape_length(buf, n);
+ if (!y)
+ return -ENOMEM;
+
+ printf("%s%s%s %s%s%s: %s\n",
+ prefix,
+ glyph == SPECIAL_GLYPH_TREE_BRANCH ? special_glyph(SPECIAL_GLYPH_TREE_VERTICAL) : " ",
+ special_glyph(SPECIAL_GLYPH_ARROW_RIGHT),
+ ansi_blue(), x, ansi_normal(),
+ y);
+ }
+ }
+
+ return 0;
+}
+
+int show_cgroup_by_path(
+ const char *path,
+ const char *prefix,
+ size_t n_columns,
+ OutputFlags flags) {
+
+ _cleanup_free_ char *fn = NULL, *p1 = NULL, *last = NULL, *p2 = NULL;
+ _cleanup_closedir_ DIR *d = NULL;
+ bool shown_pids = false;
+ char *gn = NULL;
+ int r;
+
+ assert(path);
+
+ if (n_columns <= 0)
+ n_columns = columns();
+
+ prefix = strempty(prefix);
+
+ r = cg_mangle_path(path, &fn);
+ if (r < 0)
+ return r;
+
+ d = opendir(fn);
+ if (!d)
+ return -errno;
+
+ while ((r = cg_read_subgroup(d, &gn)) > 0) {
+ _cleanup_free_ char *k = NULL;
+
+ k = path_join(fn, gn);
+ free(gn);
+ if (!k)
+ return -ENOMEM;
+
+ if (!(flags & OUTPUT_SHOW_ALL) && cg_is_empty_recursive(NULL, k) > 0)
+ continue;
+
+ if (!shown_pids) {
+ show_cgroup_one_by_path(path, prefix, n_columns, true, flags);
+ shown_pids = true;
+ }
+
+ if (last) {
+ r = show_cgroup_name(last, prefix, SPECIAL_GLYPH_TREE_BRANCH, flags);
+ if (r < 0)
+ return r;
+
+ if (!p1) {
+ p1 = strjoin(prefix, special_glyph(SPECIAL_GLYPH_TREE_VERTICAL));
+ if (!p1)
+ return -ENOMEM;
+ }
+
+ show_cgroup_by_path(last, p1, n_columns-2, flags);
+ free(last);
+ }
+
+ last = TAKE_PTR(k);
+ }
+
+ if (r < 0)
+ return r;
+
+ if (!shown_pids)
+ show_cgroup_one_by_path(path, prefix, n_columns, !!last, flags);
+
+ if (last) {
+ r = show_cgroup_name(last, prefix, SPECIAL_GLYPH_TREE_RIGHT, flags);
+ if (r < 0)
+ return r;
+
+ if (!p2) {
+ p2 = strjoin(prefix, " ");
+ if (!p2)
+ return -ENOMEM;
+ }
+
+ show_cgroup_by_path(last, p2, n_columns-2, flags);
+ }
+
+ return 0;
+}
+
+int show_cgroup(const char *controller,
+ const char *path,
+ const char *prefix,
+ size_t n_columns,
+ OutputFlags flags) {
+ _cleanup_free_ char *p = NULL;
+ int r;
+
+ assert(path);
+
+ r = cg_get_path(controller, path, NULL, &p);
+ if (r < 0)
+ return r;
+
+ return show_cgroup_by_path(p, prefix, n_columns, flags);
+}
+
+static int show_extra_pids(
+ const char *controller,
+ const char *path,
+ const char *prefix,
+ size_t n_columns,
+ const pid_t pids[],
+ unsigned n_pids,
+ OutputFlags flags) {
+
+ _cleanup_free_ pid_t *copy = NULL;
+ unsigned i, j;
+ int r;
+
+ assert(path);
+
+ if (n_pids <= 0)
+ return 0;
+
+ if (n_columns <= 0)
+ n_columns = columns();
+
+ prefix = strempty(prefix);
+
+ copy = new(pid_t, n_pids);
+ if (!copy)
+ return -ENOMEM;
+
+ for (i = 0, j = 0; i < n_pids; i++) {
+ _cleanup_free_ char *k = NULL;
+
+ r = cg_pid_get_path(controller, pids[i], &k);
+ if (r < 0)
+ return r;
+
+ if (path_startswith(k, path))
+ continue;
+
+ copy[j++] = pids[i];
+ }
+
+ show_pid_array(copy, j, prefix, n_columns, true, false, flags);
+
+ return 0;
+}
+
+int show_cgroup_and_extra(
+ const char *controller,
+ const char *path,
+ const char *prefix,
+ size_t n_columns,
+ const pid_t extra_pids[],
+ unsigned n_extra_pids,
+ OutputFlags flags) {
+
+ int r;
+
+ assert(path);
+
+ r = show_cgroup(controller, path, prefix, n_columns, flags);
+ if (r < 0)
+ return r;
+
+ return show_extra_pids(controller, path, prefix, n_columns, extra_pids, n_extra_pids, flags);
+}
+
+int show_cgroup_get_unit_path_and_warn(
+ sd_bus *bus,
+ const char *unit,
+ char **ret) {
+
+ _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
+ _cleanup_free_ char *path = NULL;
+ int r;
+
+ path = unit_dbus_path_from_name(unit);
+ if (!path)
+ return log_oom();
+
+ r = sd_bus_get_property_string(
+ bus,
+ "org.freedesktop.systemd1",
+ path,
+ unit_dbus_interface_from_name(unit),
+ "ControlGroup",
+ &error,
+ ret);
+ if (r < 0)
+ return log_error_errno(r, "Failed to query unit control group path: %s",
+ bus_error_message(&error, r));
+
+ return 0;
+}
+
+int show_cgroup_get_path_and_warn(
+ const char *machine,
+ const char *prefix,
+ char **ret) {
+
+ _cleanup_free_ char *root = NULL;
+ int r;
+
+ if (machine) {
+ _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
+ _cleanup_free_ char *unit = NULL;
+ const char *m;
+
+ if (!hostname_is_valid(machine, 0))
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Machine name is not valid: %s", machine);
+
+ m = strjoina("/run/systemd/machines/", machine);
+ r = parse_env_file(NULL, m, "SCOPE", &unit);
+ if (r < 0)
+ return log_error_errno(r, "Failed to load machine data: %m");
+
+ r = bus_connect_transport_systemd(BUS_TRANSPORT_LOCAL, NULL, false, &bus);
+ if (r < 0)
+ return bus_log_connect_error(r, BUS_TRANSPORT_LOCAL);
+
+ r = show_cgroup_get_unit_path_and_warn(bus, unit, &root);
+ if (r < 0)
+ return r;
+ } else {
+ r = cg_get_root_path(&root);
+ if (r == -ENOMEDIUM)
+ return log_error_errno(r, "Failed to get root control group path.\n"
+ "No cgroup filesystem mounted on /sys/fs/cgroup");
+ if (r < 0)
+ return log_error_errno(r, "Failed to get root control group path: %m");
+ }
+
+ if (prefix) {
+ char *t;
+
+ t = path_join(root, prefix);
+ if (!t)
+ return log_oom();
+
+ *ret = t;
+ } else
+ *ret = TAKE_PTR(root);
+
+ return 0;
+}
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