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cgroups-show: optionally show cgroup xattrs + cgroup id in cgroup tree output
This commit is contained in:
Lennart Poettering
parent
aa13d38417
commit
5a5a5d2914
@ -12,11 +12,13 @@
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#include "cgroup-show.h"
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#include "cgroup-util.h"
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#include "env-file.h"
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#include "escape.h"
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#include "fd-util.h"
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#include "format-util.h"
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#include "hostname-util.h"
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#include "locale-util.h"
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#include "macro.h"
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#include "nulstr-util.h"
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#include "output-mode.h"
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#include "parse-util.h"
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#include "path-util.h"
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@ -122,38 +124,109 @@ static int show_cgroup_one_by_path(
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static int show_cgroup_name(
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const char *path,
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const char *prefix,
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const char *glyph) {
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SpecialGlyph glyph,
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OutputFlags flags) {
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uint64_t cgroupid = UINT64_MAX;
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_cleanup_free_ char *b = NULL;
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_cleanup_close_ int fd = -1;
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bool delegate = false;
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int r;
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r = lgetxattr_malloc(path, "trusted.delegate", &b);
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if (FLAGS_SET(flags, OUTPUT_CGROUP_XATTRS) || FLAGS_SET(flags, OUTPUT_CGROUP_ID)) {
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fd = open(path, O_PATH|O_CLOEXEC|O_NOFOLLOW|O_DIRECTORY, 0);
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if (fd < 0)
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log_debug_errno(errno, "Failed to open cgroup '%s', ignoring: %m", path);
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}
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r = getxattr_malloc(fd < 0 ? path : FORMAT_PROC_FD_PATH(fd), "trusted.delegate", &b);
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if (r < 0) {
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if (r != -ENODATA)
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log_debug_errno(r, "Failed to read trusted.delegate extended attribute: %m");
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log_debug_errno(r, "Failed to read trusted.delegate extended attribute, ignoring: %m");
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} else {
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r = parse_boolean(b);
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if (r < 0)
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log_debug_errno(r, "Failed to parse trusted.delegate extended attribute boolean value: %m");
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log_debug_errno(r, "Failed to parse trusted.delegate extended attribute boolean value, ignoring: %m");
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else
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delegate = r > 0;
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b = mfree(b);
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}
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b = strdup(basename(path));
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if (!b)
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return -ENOMEM;
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if (FLAGS_SET(flags, OUTPUT_CGROUP_ID)) {
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cg_file_handle fh = CG_FILE_HANDLE_INIT;
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int mnt_id = -1;
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printf("%s%s%s%s%s %s%s%s\n",
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prefix, glyph,
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if (name_to_handle_at(
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fd < 0 ? AT_FDCWD : fd,
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fd < 0 ? path : "",
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&fh.file_handle,
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&mnt_id,
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fd < 0 ? 0 : AT_EMPTY_PATH) < 0)
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log_debug_errno(errno, "Failed to determine cgroup ID of %s, ignoring: %m", path);
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else
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cgroupid = CG_FILE_HANDLE_CGROUPID(fh);
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}
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r = path_extract_filename(path, &b);
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if (r < 0)
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return log_error_errno(r, "Failed to extract filename from cgroup path: %m");
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printf("%s%s%s%s%s",
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prefix, special_glyph(glyph),
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delegate ? ansi_underline() : "",
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cg_unescape(b),
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delegate ? ansi_normal() : "",
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delegate ? ansi_highlight() : "",
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delegate ? special_glyph(SPECIAL_GLYPH_ELLIPSIS) : "",
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delegate ? ansi_normal() : "");
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if (delegate)
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printf(" %s%s%s",
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ansi_highlight(),
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special_glyph(SPECIAL_GLYPH_ELLIPSIS),
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ansi_normal());
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if (cgroupid != UINT64_MAX)
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printf(" %s(#%" PRIu64 ")%s", ansi_grey(), cgroupid, ansi_normal());
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printf("\n");
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if (FLAGS_SET(flags, OUTPUT_CGROUP_XATTRS) && fd >= 0) {
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_cleanup_free_ char *nl = NULL;
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char *xa;
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r = flistxattr_malloc(fd, &nl);
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if (r < 0)
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log_debug_errno(r, "Failed to enumerate xattrs on '%s', ignoring: %m", path);
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NULSTR_FOREACH(xa, nl) {
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_cleanup_free_ char *x = NULL, *y = NULL, *buf = NULL;
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int n;
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if (!STARTSWITH_SET(xa, "user.", "trusted."))
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continue;
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n = fgetxattr_malloc(fd, xa, &buf);
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if (n < 0) {
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log_debug_errno(r, "Failed to read xattr '%s' off '%s', ignoring: %m", xa, path);
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continue;
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}
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x = cescape(xa);
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if (!x)
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return -ENOMEM;
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y = cescape_length(buf, n);
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if (!y)
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return -ENOMEM;
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printf("%s%s%s %s%s%s: %s\n",
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prefix,
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glyph == SPECIAL_GLYPH_TREE_BRANCH ? special_glyph(SPECIAL_GLYPH_TREE_VERTICAL) : " ",
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special_glyph(SPECIAL_GLYPH_ARROW),
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ansi_blue(), x, ansi_normal(),
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y);
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}
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}
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return 0;
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}
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@ -201,7 +274,7 @@ int show_cgroup_by_path(
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}
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if (last) {
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r = show_cgroup_name(last, prefix, special_glyph(SPECIAL_GLYPH_TREE_BRANCH));
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r = show_cgroup_name(last, prefix, SPECIAL_GLYPH_TREE_BRANCH, flags);
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if (r < 0)
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return r;
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@ -225,7 +298,7 @@ int show_cgroup_by_path(
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show_cgroup_one_by_path(path, prefix, n_columns, !!last, flags);
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if (last) {
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r = show_cgroup_name(last, prefix, special_glyph(SPECIAL_GLYPH_TREE_RIGHT));
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r = show_cgroup_name(last, prefix, SPECIAL_GLYPH_TREE_RIGHT, flags);
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if (r < 0)
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return r;
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@ -33,14 +33,20 @@ static inline bool OUTPUT_MODE_IS_JSON(OutputMode m) {
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typedef enum OutputFlags {
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OUTPUT_SHOW_ALL = 1 << 0,
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OUTPUT_WARN_CUTOFF = 1 << 1,
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OUTPUT_FULL_WIDTH = 1 << 2,
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OUTPUT_COLOR = 1 << 3,
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OUTPUT_FULL_WIDTH = 1 << 1,
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OUTPUT_COLOR = 1 << 2,
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/* Specific to log output */
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OUTPUT_WARN_CUTOFF = 1 << 3,
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OUTPUT_CATALOG = 1 << 4,
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OUTPUT_BEGIN_NEWLINE = 1 << 5,
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OUTPUT_UTC = 1 << 6,
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OUTPUT_KERNEL_THREADS = 1 << 7,
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OUTPUT_NO_HOSTNAME = 1 << 8,
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OUTPUT_NO_HOSTNAME = 1 << 7,
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/* Specific to process tree output */
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OUTPUT_KERNEL_THREADS = 1 << 8,
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OUTPUT_CGROUP_XATTRS = 1 << 9,
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OUTPUT_CGROUP_ID = 1 << 10,
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} OutputFlags;
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JsonFormatFlags output_mode_to_json_format_flags(OutputMode m);
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