diff options
Diffstat (limited to 'src/udev/udevadm-info.c')
-rw-r--r-- | src/udev/udevadm-info.c | 871 |
1 files changed, 871 insertions, 0 deletions
diff --git a/src/udev/udevadm-info.c b/src/udev/udevadm-info.c new file mode 100644 index 0000000..fccc967 --- /dev/null +++ b/src/udev/udevadm-info.c @@ -0,0 +1,871 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ + +#include <ctype.h> +#include <errno.h> +#include <fcntl.h> +#include <getopt.h> +#include <stddef.h> +#include <stdio.h> +#include <sys/stat.h> +#include <unistd.h> + +#include "sd-device.h" + +#include "alloc-util.h" +#include "device-enumerator-private.h" +#include "device-private.h" +#include "device-util.h" +#include "dirent-util.h" +#include "errno-util.h" +#include "fd-util.h" +#include "fileio.h" +#include "glyph-util.h" +#include "pager.h" +#include "sort-util.h" +#include "static-destruct.h" +#include "string-table.h" +#include "string-util.h" +#include "terminal-util.h" +#include "udev-util.h" +#include "udevadm.h" +#include "udevadm-util.h" + +typedef enum ActionType { + ACTION_QUERY, + ACTION_ATTRIBUTE_WALK, + ACTION_DEVICE_ID_FILE, + ACTION_TREE, +} ActionType; + +typedef enum QueryType { + QUERY_NAME, + QUERY_PATH, + QUERY_SYMLINK, + QUERY_PROPERTY, + QUERY_ALL, +} QueryType; + +static char **arg_properties = NULL; +static bool arg_root = false; +static bool arg_export = false; +static bool arg_value = false; +static const char *arg_export_prefix = NULL; +static usec_t arg_wait_for_initialization_timeout = 0; +PagerFlags arg_pager_flags = 0; + +/* Put a limit on --tree descent level to not exhaust our stack */ +#define TREE_DEPTH_MAX 64 + +static bool skip_attribute(const char *name) { + assert(name); + + /* Those are either displayed separately or should not be shown at all. */ + return STR_IN_SET(name, + "uevent", + "dev", + "modalias", + "resource", + "driver", + "subsystem", + "module"); +} + +typedef struct SysAttr { + const char *name; + const char *value; +} SysAttr; + +STATIC_DESTRUCTOR_REGISTER(arg_properties, strv_freep); + +static int sysattr_compare(const SysAttr *a, const SysAttr *b) { + assert(a); + assert(b); + + return strcmp(a->name, b->name); +} + +static int print_all_attributes(sd_device *device, bool is_parent) { + _cleanup_free_ SysAttr *sysattrs = NULL; + const char *name, *value; + size_t n_items = 0; + int r; + + assert(device); + + value = NULL; + (void) sd_device_get_devpath(device, &value); + printf(" looking at %sdevice '%s':\n", is_parent ? "parent " : "", strempty(value)); + + value = NULL; + (void) sd_device_get_sysname(device, &value); + printf(" %s==\"%s\"\n", is_parent ? "KERNELS" : "KERNEL", strempty(value)); + + value = NULL; + (void) sd_device_get_subsystem(device, &value); + printf(" %s==\"%s\"\n", is_parent ? "SUBSYSTEMS" : "SUBSYSTEM", strempty(value)); + + value = NULL; + (void) sd_device_get_driver(device, &value); + printf(" %s==\"%s\"\n", is_parent ? "DRIVERS" : "DRIVER", strempty(value)); + + FOREACH_DEVICE_SYSATTR(device, name) { + size_t len; + + if (skip_attribute(name)) + continue; + + r = sd_device_get_sysattr_value(device, name, &value); + if (r >= 0) { + /* skip any values that look like a path */ + if (value[0] == '/') + continue; + + /* skip nonprintable attributes */ + len = strlen(value); + while (len > 0 && isprint((unsigned char) value[len-1])) + len--; + if (len > 0) + continue; + + } else if (ERRNO_IS_PRIVILEGE(r)) + value = "(not readable)"; + else + continue; + + if (!GREEDY_REALLOC(sysattrs, n_items + 1)) + return log_oom(); + + sysattrs[n_items] = (SysAttr) { + .name = name, + .value = value, + }; + n_items++; + } + + typesafe_qsort(sysattrs, n_items, sysattr_compare); + + for (size_t i = 0; i < n_items; i++) + printf(" %s{%s}==\"%s\"\n", is_parent ? "ATTRS" : "ATTR", sysattrs[i].name, sysattrs[i].value); + + puts(""); + + return 0; +} + +static int print_device_chain(sd_device *device) { + sd_device *child, *parent; + int r; + + assert(device); + + printf("\n" + "Udevadm info starts with the device specified by the devpath and then\n" + "walks up the chain of parent devices. It prints for every device\n" + "found, all possible attributes in the udev rules key format.\n" + "A rule to match, can be composed by the attributes of the device\n" + "and the attributes from one single parent device.\n" + "\n"); + + r = print_all_attributes(device, false); + if (r < 0) + return r; + + for (child = device; sd_device_get_parent(child, &parent) >= 0; child = parent) { + r = print_all_attributes(parent, true); + if (r < 0) + return r; + } + + return 0; +} + +static int print_record(sd_device *device, const char *prefix) { + const char *str, *val, *subsys; + dev_t devnum; + uint64_t q; + int i, ifi; + + assert(device); + + prefix = strempty(prefix); + + /* We don't show syspath here, because it's identical to devpath (modulo the "/sys" prefix). + * + * We don't show action/seqnum here because that only makes sense for records synthesized from + * uevents, not for those synthesized from database entries. + * + * We don't show sysattrs here, because they can be expensive and potentially issue expensive driver + * IO. + * + * Coloring: let's be conservative with coloring. Let's use it to group related fields. Right now: + * + * • white for fields that give the device a name + * • green for fields that categorize the device into subsystem/devtype and similar + * • cyan for fields about associated device nodes/symlinks/network interfaces and such + * • magenta for block device diskseq + * • yellow for driver info + * • no color for regular properties */ + + assert_se(sd_device_get_devpath(device, &str) >= 0); + printf("%sP: %s%s%s\n", prefix, ansi_highlight_white(), str, ansi_normal()); + + if (sd_device_get_sysname(device, &str) >= 0) + printf("%sM: %s%s%s\n", prefix, ansi_highlight_white(), str, ansi_normal()); + + if (sd_device_get_sysnum(device, &str) >= 0) + printf("%sR: %s%s%s\n", prefix, ansi_highlight_white(), str, ansi_normal()); + + if (sd_device_get_subsystem(device, &subsys) >= 0) + printf("%sU: %s%s%s\n", prefix, ansi_highlight_green(), subsys, ansi_normal()); + + if (sd_device_get_devtype(device, &str) >= 0) + printf("%sT: %s%s%s\n", prefix, ansi_highlight_green(), str, ansi_normal()); + + if (sd_device_get_devnum(device, &devnum) >= 0) + printf("%sD: %s%c %u:%u%s\n", + prefix, + ansi_highlight_cyan(), + streq_ptr(subsys, "block") ? 'b' : 'c', major(devnum), minor(devnum), + ansi_normal()); + + if (sd_device_get_ifindex(device, &ifi) >= 0) + printf("%sI: %s%i%s\n", prefix, ansi_highlight_cyan(), ifi, ansi_normal()); + + if (sd_device_get_devname(device, &str) >= 0) { + assert_se(val = path_startswith(str, "/dev/")); + printf("%sN: %s%s%s\n", prefix, ansi_highlight_cyan(), val, ansi_normal()); + + if (device_get_devlink_priority(device, &i) >= 0) + printf("%sL: %s%i%s\n", prefix, ansi_highlight_cyan(), i, ansi_normal()); + + FOREACH_DEVICE_DEVLINK(device, str) { + assert_se(val = path_startswith(str, "/dev/")); + printf("%sS: %s%s%s\n", prefix, ansi_highlight_cyan(), val, ansi_normal()); + } + } + + if (sd_device_get_diskseq(device, &q) >= 0) + printf("%sQ: %s%" PRIu64 "%s\n", prefix, ansi_highlight_magenta(), q, ansi_normal()); + + if (sd_device_get_driver(device, &str) >= 0) + printf("%sV: %s%s%s\n", prefix, ansi_highlight_yellow4(), str, ansi_normal()); + + FOREACH_DEVICE_PROPERTY(device, str, val) + printf("%sE: %s=%s\n", prefix, str, val); + + if (isempty(prefix)) + puts(""); + return 0; +} + +static int stat_device(const char *name, bool export, const char *prefix) { + struct stat statbuf; + + assert(name); + + if (stat(name, &statbuf) != 0) + return -errno; + + if (export) { + if (!prefix) + prefix = "INFO_"; + printf("%sMAJOR=%u\n" + "%sMINOR=%u\n", + prefix, major(statbuf.st_dev), + prefix, minor(statbuf.st_dev)); + } else + printf("%u:%u\n", major(statbuf.st_dev), minor(statbuf.st_dev)); + return 0; +} + +static int export_devices(void) { + _cleanup_(sd_device_enumerator_unrefp) sd_device_enumerator *e = NULL; + sd_device *d; + int r; + + r = sd_device_enumerator_new(&e); + if (r < 0) + return log_oom(); + + r = sd_device_enumerator_allow_uninitialized(e); + if (r < 0) + return log_error_errno(r, "Failed to set allowing uninitialized flag: %m"); + + r = device_enumerator_scan_devices(e); + if (r < 0) + return log_error_errno(r, "Failed to scan devices: %m"); + + pager_open(arg_pager_flags); + + FOREACH_DEVICE_AND_SUBSYSTEM(e, d) + (void) print_record(d, NULL); + + return 0; +} + +static void cleanup_dir(DIR *dir, mode_t mask, int depth) { + assert(dir); + + if (depth <= 0) + return; + + FOREACH_DIRENT_ALL(dent, dir, break) { + struct stat stats; + + if (dot_or_dot_dot(dent->d_name)) + continue; + if (fstatat(dirfd(dir), dent->d_name, &stats, AT_SYMLINK_NOFOLLOW) < 0) + continue; + if ((stats.st_mode & mask) != 0) + continue; + if (S_ISDIR(stats.st_mode)) { + _cleanup_closedir_ DIR *subdir = NULL; + + subdir = xopendirat(dirfd(dir), dent->d_name, O_NOFOLLOW); + if (!subdir) + log_debug_errno(errno, "Failed to open subdirectory '%s', ignoring: %m", dent->d_name); + else + cleanup_dir(subdir, mask, depth-1); + + (void) unlinkat(dirfd(dir), dent->d_name, AT_REMOVEDIR); + } else + (void) unlinkat(dirfd(dir), dent->d_name, 0); + } +} + +/* + * Assume that dir is a directory with file names matching udev data base + * entries for devices in /run/udev/data (such as "b8:16"), and removes + * all files except those that haven't been deleted in /run/udev/data + * (i.e. they were skipped during db cleanup because of the db_persist flag). + */ +static void cleanup_dir_after_db_cleanup(DIR *dir, DIR *datadir) { + assert(dir); + assert(datadir); + + FOREACH_DIRENT_ALL(dent, dir, break) { + if (dot_or_dot_dot(dent->d_name)) + continue; + + if (faccessat(dirfd(datadir), dent->d_name, F_OK, AT_SYMLINK_NOFOLLOW) >= 0) + /* The corresponding udev database file still exists. + * Assuming the parsistent flag is set for the database. */ + continue; + + (void) unlinkat(dirfd(dir), dent->d_name, 0); + } +} + +static void cleanup_dirs_after_db_cleanup(DIR *dir, DIR *datadir) { + assert(dir); + assert(datadir); + + FOREACH_DIRENT_ALL(dent, dir, break) { + struct stat stats; + + if (dot_or_dot_dot(dent->d_name)) + continue; + if (fstatat(dirfd(dir), dent->d_name, &stats, AT_SYMLINK_NOFOLLOW) < 0) + continue; + if (S_ISDIR(stats.st_mode)) { + _cleanup_closedir_ DIR *subdir = NULL; + + subdir = xopendirat(dirfd(dir), dent->d_name, O_NOFOLLOW); + if (!subdir) + log_debug_errno(errno, "Failed to open subdirectory '%s', ignoring: %m", dent->d_name); + else + cleanup_dir_after_db_cleanup(subdir, datadir); + + (void) unlinkat(dirfd(dir), dent->d_name, AT_REMOVEDIR); + } else + (void) unlinkat(dirfd(dir), dent->d_name, 0); + } +} + +static void cleanup_db(void) { + _cleanup_closedir_ DIR *dir1 = NULL, *dir2 = NULL, *dir3 = NULL, *dir4 = NULL; + + dir1 = opendir("/run/udev/data"); + if (dir1) + cleanup_dir(dir1, S_ISVTX, 1); + + dir2 = opendir("/run/udev/links"); + if (dir2) + cleanup_dirs_after_db_cleanup(dir2, dir1); + + dir3 = opendir("/run/udev/tags"); + if (dir3) + cleanup_dirs_after_db_cleanup(dir3, dir1); + + dir4 = opendir("/run/udev/static_node-tags"); + if (dir4) + cleanup_dir(dir4, 0, 2); + + /* Do not remove /run/udev/watch. It will be handled by udevd well on restart. + * And should not be removed by external program when udevd is running. */ +} + +static int query_device(QueryType query, sd_device* device) { + int r; + + assert(device); + + switch (query) { + case QUERY_NAME: { + const char *node; + + r = sd_device_get_devname(device, &node); + if (r < 0) + return log_error_errno(r, "No device node found: %m"); + + if (!arg_root) + assert_se(node = path_startswith(node, "/dev/")); + printf("%s\n", node); + return 0; + } + + case QUERY_SYMLINK: { + const char *devlink, *prefix = ""; + + FOREACH_DEVICE_DEVLINK(device, devlink) { + if (!arg_root) + assert_se(devlink = path_startswith(devlink, "/dev/")); + printf("%s%s", prefix, devlink); + prefix = " "; + } + puts(""); + return 0; + } + + case QUERY_PATH: { + const char *devpath; + + r = sd_device_get_devpath(device, &devpath); + if (r < 0) + return log_error_errno(r, "Failed to get device path: %m"); + + printf("%s\n", devpath); + return 0; + } + + case QUERY_PROPERTY: { + const char *key, *value; + + FOREACH_DEVICE_PROPERTY(device, key, value) { + if (arg_properties && !strv_contains(arg_properties, key)) + continue; + + if (arg_export) + printf("%s%s='%s'\n", strempty(arg_export_prefix), key, value); + else if (arg_value) + printf("%s\n", value); + else + printf("%s=%s\n", key, value); + } + + return 0; + } + + case QUERY_ALL: + return print_record(device, NULL); + + default: + assert_not_reached(); + } +} + +static int help(void) { + printf("%s info [OPTIONS] [DEVPATH|FILE]\n\n" + "Query sysfs or the udev database.\n\n" + " -h --help Print this message\n" + " -V --version Print version of the program\n" + " -q --query=TYPE Query device information:\n" + " name Name of device node\n" + " symlink Pointing to node\n" + " path sysfs device path\n" + " property The device properties\n" + " all All values\n" + " --property=NAME Show only properties by this name\n" + " --value When showing properties, print only their values\n" + " -p --path=SYSPATH sysfs device path used for query or attribute walk\n" + " -n --name=NAME Node or symlink name used for query or attribute walk\n" + " -r --root Prepend dev directory to path names\n" + " -a --attribute-walk Print all key matches walking along the chain\n" + " of parent devices\n" + " -t --tree Show tree of devices\n" + " -d --device-id-of-file=FILE Print major:minor of device containing this file\n" + " -x --export Export key/value pairs\n" + " -P --export-prefix Export the key name with a prefix\n" + " -e --export-db Export the content of the udev database\n" + " -c --cleanup-db Clean up the udev database\n" + " -w --wait-for-initialization[=SECONDS]\n" + " Wait for device to be initialized\n" + " --no-pager Do not pipe output into a pager\n", + program_invocation_short_name); + + return 0; +} + +static int draw_tree( + sd_device *parent, + sd_device *const array[], size_t n, + const char *prefix, + unsigned level); + +static int output_tree_device( + sd_device *device, + const char *str, + const char *prefix, + bool more, + sd_device *const array[], size_t n, + unsigned level) { + + _cleanup_free_ char *subprefix = NULL, *subsubprefix = NULL; + + assert(device); + assert(str); + + prefix = strempty(prefix); + + printf("%s%s%s\n", prefix, special_glyph(more ? SPECIAL_GLYPH_TREE_BRANCH : SPECIAL_GLYPH_TREE_RIGHT), str); + + subprefix = strjoin(prefix, special_glyph(more ? SPECIAL_GLYPH_TREE_VERTICAL : SPECIAL_GLYPH_TREE_SPACE)); + if (!subprefix) + return log_oom(); + + subsubprefix = strjoin(subprefix, special_glyph(SPECIAL_GLYPH_VERTICAL_DOTTED), " "); + if (!subsubprefix) + return log_oom(); + + (void) print_record(device, subsubprefix); + + return draw_tree(device, array, n, subprefix, level + 1); +} + +static int draw_tree( + sd_device *parent, + sd_device *const array[], size_t n, + const char *prefix, + unsigned level) { + + const char *parent_path; + size_t i = 0; + int r; + + if (n == 0) + return 0; + + assert(array); + + if (parent) { + r = sd_device_get_devpath(parent, &parent_path); + if (r < 0) + return log_error_errno(r, "Failed to get sysfs path of parent device: %m"); + } else + parent_path = NULL; + + if (level > TREE_DEPTH_MAX) { + log_warning("Eliding tree below '%s', too deep.", strna(parent_path)); + return 0; + } + + while (i < n) { + sd_device *device = array[i]; + const char *device_path, *str; + bool more = false; + size_t j; + + r = sd_device_get_devpath(device, &device_path); + if (r < 0) + return log_error_errno(r, "Failed to get sysfs path of enumerated device: %m"); + + /* Scan through the subsequent devices looking children of the device we are looking at. */ + for (j = i + 1; j < n; j++) { + sd_device *next = array[j]; + const char *next_path; + + r = sd_device_get_devpath(next, &next_path); + if (r < 0) + return log_error_errno(r, "Failed to get sysfs of child device: %m"); + + if (!path_startswith(next_path, device_path)) { + more = !parent_path || path_startswith(next_path, parent_path); + break; + } + } + + /* Determine the string to display for this node. If we are at the top of the tree, the full + * device path so far, otherwise just the part suffixing the parent's device path. */ + str = parent ? ASSERT_PTR(path_startswith(device_path, parent_path)) : device_path; + + r = output_tree_device(device, str, prefix, more, array + i + 1, j - i - 1, level); + if (r < 0) + return r; + + i = j; + } + + return 0; +} + +static int print_tree(sd_device* below) { + _cleanup_(sd_device_enumerator_unrefp) sd_device_enumerator *e = NULL; + const char *below_path; + sd_device **array; + size_t n = 0; + int r; + + if (below) { + r = sd_device_get_devpath(below, &below_path); + if (r < 0) + return log_error_errno(r, "Failed to get sysfs path of device: %m"); + + } else + below_path = NULL; + + r = sd_device_enumerator_new(&e); + if (r < 0) + return log_error_errno(r, "Failed to allocate device enumerator: %m"); + + if (below) { + r = sd_device_enumerator_add_match_parent(e, below); + if (r < 0) + return log_error_errno(r, "Failed to install parent enumerator match: %m"); + } + + r = sd_device_enumerator_allow_uninitialized(e); + if (r < 0) + return log_error_errno(r, "Failed to enable enumeration of uninitialized devices: %m"); + + r = device_enumerator_scan_devices_and_subsystems(e); + if (r < 0) + return log_error_errno(r, "Failed to scan for devices and subsystems: %m"); + + if (below) { + /* This must be called after device_enumerator_scan_devices_and_subsystems(). */ + r = device_enumerator_add_parent_devices(e, below); + if (r < 0) + return log_error_errno(r, "Failed to add parent devices: %m"); + } + + assert_se(array = device_enumerator_get_devices(e, &n)); + + if (n == 0) { + log_info("No items."); + return 0; + } + + r = draw_tree(NULL, array, n, NULL, 0); + if (r < 0) + return r; + + printf("\n%zu items shown.\n", n); + return 0; +} + +int info_main(int argc, char *argv[], void *userdata) { + _cleanup_strv_free_ char **devices = NULL; + _cleanup_free_ char *name = NULL; + int c, r, ret; + + enum { + ARG_PROPERTY = 0x100, + ARG_VALUE, + ARG_NO_PAGER, + }; + + static const struct option options[] = { + { "attribute-walk", no_argument, NULL, 'a' }, + { "tree", no_argument, NULL, 't' }, + { "cleanup-db", no_argument, NULL, 'c' }, + { "device-id-of-file", required_argument, NULL, 'd' }, + { "export", no_argument, NULL, 'x' }, + { "export-db", no_argument, NULL, 'e' }, + { "export-prefix", required_argument, NULL, 'P' }, + { "help", no_argument, NULL, 'h' }, + { "name", required_argument, NULL, 'n' }, + { "path", required_argument, NULL, 'p' }, + { "property", required_argument, NULL, ARG_PROPERTY }, + { "query", required_argument, NULL, 'q' }, + { "root", no_argument, NULL, 'r' }, + { "value", no_argument, NULL, ARG_VALUE }, + { "version", no_argument, NULL, 'V' }, + { "wait-for-initialization", optional_argument, NULL, 'w' }, + { "no-pager", no_argument, NULL, ARG_NO_PAGER }, + {} + }; + + ActionType action = ACTION_QUERY; + QueryType query = QUERY_ALL; + + while ((c = getopt_long(argc, argv, "atced:n:p:q:rxP:w::Vh", options, NULL)) >= 0) + switch (c) { + case ARG_PROPERTY: + /* Make sure that if the empty property list was specified, we won't show any + properties. */ + if (isempty(optarg) && !arg_properties) { + arg_properties = new0(char*, 1); + if (!arg_properties) + return log_oom(); + } else { + r = strv_split_and_extend(&arg_properties, optarg, ",", true); + if (r < 0) + return log_oom(); + } + break; + case ARG_VALUE: + arg_value = true; + break; + case 'n': + case 'p': { + const char *prefix = c == 'n' ? "/dev/" : "/sys/"; + char *path; + + path = path_join(path_startswith(optarg, prefix) ? NULL : prefix, optarg); + if (!path) + return log_oom(); + + r = strv_consume(&devices, path); + if (r < 0) + return log_oom(); + break; + } + + case 'q': + action = ACTION_QUERY; + if (streq(optarg, "property") || streq(optarg, "env")) + query = QUERY_PROPERTY; + else if (streq(optarg, "name")) + query = QUERY_NAME; + else if (streq(optarg, "symlink")) + query = QUERY_SYMLINK; + else if (streq(optarg, "path")) + query = QUERY_PATH; + else if (streq(optarg, "all")) + query = QUERY_ALL; + else + return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "unknown query type"); + break; + case 'r': + arg_root = true; + break; + case 'd': + action = ACTION_DEVICE_ID_FILE; + r = free_and_strdup(&name, optarg); + if (r < 0) + return log_oom(); + break; + case 'a': + action = ACTION_ATTRIBUTE_WALK; + break; + case 't': + action = ACTION_TREE; + break; + case 'e': + return export_devices(); + case 'c': + cleanup_db(); + return 0; + case 'x': + arg_export = true; + break; + case 'P': + arg_export = true; + arg_export_prefix = optarg; + break; + case 'w': + if (optarg) { + r = parse_sec(optarg, &arg_wait_for_initialization_timeout); + if (r < 0) + return log_error_errno(r, "Failed to parse timeout value: %m"); + } else + arg_wait_for_initialization_timeout = USEC_INFINITY; + break; + case 'V': + return print_version(); + case 'h': + return help(); + case ARG_NO_PAGER: + arg_pager_flags |= PAGER_DISABLE; + break; + case '?': + return -EINVAL; + default: + assert_not_reached(); + } + + if (action == ACTION_DEVICE_ID_FILE) { + if (argv[optind]) + return log_error_errno(SYNTHETIC_ERRNO(EINVAL), + "Positional arguments are not allowed with -d/--device-id-of-file."); + assert(name); + return stat_device(name, arg_export, arg_export_prefix); + } + + r = strv_extend_strv(&devices, argv + optind, false); + if (r < 0) + return log_error_errno(r, "Failed to build argument list: %m"); + + if (action != ACTION_TREE && strv_isempty(devices)) + return log_error_errno(SYNTHETIC_ERRNO(EINVAL), + "A device name or path is required"); + if (IN_SET(action, ACTION_ATTRIBUTE_WALK, ACTION_TREE) && strv_length(devices) > 1) + return log_error_errno(SYNTHETIC_ERRNO(EINVAL), + "Only one device may be specified with -a/--attribute-walk and -t/--tree"); + + if (arg_export && arg_value) + return log_error_errno(SYNTHETIC_ERRNO(EINVAL), + "-x/--export or -P/--export-prefix cannot be used with --value"); + + pager_open(arg_pager_flags); + + if (strv_isempty(devices)) { + assert(action == ACTION_TREE); + return print_tree(NULL); + } + + ret = 0; + STRV_FOREACH(p, devices) { + _cleanup_(sd_device_unrefp) sd_device *device = NULL; + + r = find_device(*p, NULL, &device); + if (r < 0) { + if (r == -EINVAL) + log_error_errno(r, "Bad argument \"%s\", expected an absolute path in /dev/ or /sys/ or a unit name: %m", *p); + else + log_error_errno(r, "Unknown device \"%s\": %m", *p); + + if (ret == 0) + ret = r; + continue; + } + + if (arg_wait_for_initialization_timeout > 0) { + sd_device *d; + + r = device_wait_for_initialization( + device, + NULL, + arg_wait_for_initialization_timeout, + &d); + if (r < 0) + return r; + + sd_device_unref(device); + device = d; + } + + if (action == ACTION_QUERY) + r = query_device(query, device); + else if (action == ACTION_ATTRIBUTE_WALK) + r = print_device_chain(device); + else if (action == ACTION_TREE) + r = print_tree(device); + else + assert_not_reached(); + if (r < 0) + return r; + } + + return ret; +} |