50 lines
1.5 KiB
C
50 lines
1.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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#include <errno.h>
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#include "alloc-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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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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if (unit_name_is_valid(id, UNIT_NAME_PLAIN) &&
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unit_name_to_type(id) == UNIT_DEVICE) {
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r = unit_name_to_path(id, &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", id);
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id = path;
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}
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}
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if (path_startswith(id, "/sys/"))
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return sd_device_new_from_syspath(ret, id);
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if (path_startswith(id, "/dev/")) {
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struct stat st;
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if (stat(id, &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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