96 lines
3 KiB
C
96 lines
3 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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#include <errno.h>
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#include "alloc-util.h"
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#include "bus-error.h"
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#include "bus-util.h"
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#include "device-private.h"
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#include "path-util.h"
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#include "udevadm-util.h"
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#include "unit-name.h"
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static int find_device_from_path(const char *path, sd_device **ret) {
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if (path_startswith(path, "/sys/"))
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return sd_device_new_from_syspath(ret, path);
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if (path_startswith(path, "/dev/")) {
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struct stat st;
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if (stat(path, &st) < 0)
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return -errno;
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return device_new_from_stat_rdev(ret, &st);
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}
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return -EINVAL;
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}
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static int find_device_from_unit(const char *unit_name, sd_device **ret) {
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_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
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_cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
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_cleanup_free_ char *unit_path = NULL, *syspath = NULL;
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int r;
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if (!unit_name_is_valid(unit_name, UNIT_NAME_PLAIN))
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return -EINVAL;
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if (unit_name_to_type(unit_name) != UNIT_DEVICE)
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return -EINVAL;
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r = bus_connect_system_systemd(&bus);
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if (r < 0) {
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_cleanup_free_ char *path = NULL;
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log_debug_errno(r, "Failed to open connection to systemd, using unit name as syspath: %m");
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r = unit_name_to_path(unit_name, &path);
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if (r < 0)
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return log_debug_errno(r, "Failed to convert \"%s\" to a device path: %m", unit_name);
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return find_device_from_path(path, ret);
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}
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unit_path = unit_dbus_path_from_name(unit_name);
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if (!unit_path)
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return -ENOMEM;
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r = sd_bus_get_property_string(
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bus,
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"org.freedesktop.systemd1",
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unit_path,
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"org.freedesktop.systemd1.Device",
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"SysFSPath",
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&error,
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&syspath);
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if (r < 0)
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return log_debug_errno(r, "Failed to get SysFSPath= dbus property for %s: %s",
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unit_name, bus_error_message(&error, r));
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return sd_device_new_from_syspath(ret, syspath);
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}
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int find_device(const char *id, const char *prefix, sd_device **ret) {
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_cleanup_free_ char *path = NULL;
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int r;
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assert(id);
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assert(ret);
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if (prefix) {
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if (!path_startswith(id, prefix)) {
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id = path = path_join(prefix, id);
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if (!path)
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return -ENOMEM;
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}
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} else {
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/* In cases where the argument is generic (no prefix specified),
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* check if the argument looks like a device unit name. */
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r = find_device_from_unit(id, ret);
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if (r >= 0)
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return r;
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}
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return find_device_from_path(id, ret);
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}
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