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Revert "sd-device: use sd_device_get_sysattr_value() to read special symlinks"

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Revert systemd commit 6ebbdcc0ddba ("sd-device: use
sd_device_get_sysattr_value() to read special symlinks"). In the NM
codebase sd_device_get_sysattr_value() is currently commented out
because it depends on file chase.c which is not imported. Importing
that file would require another long chain of imports. Therefore,
revert the commit.

This reverts commit 6ebbdcc0ddbacce732001823cf2be2a1d4381c60.

Fixes: 6a4e6fab40 ('merge: branch 'systemd' into jv/systemd-merge')
This commit is contained in:
Beniamino Galvani 2025-06-18 09:31:06 +02:00
parent fcc5352715
commit 77c99b61c0
1 changed files with 28 additions and 11 deletions
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39
src/libnm-systemd-core/src/libsystemd/sd-device/sd-device.c
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@ -1263,24 +1263,35 @@ _public_ int sd_device_get_subsystem(sd_device *device, const char **ret) {
return r;
if (!device->subsystem_set) {
const char *subsystem;
_cleanup_free_ char *subsystem = NULL;
const char *syspath;
char *path;
r = sd_device_get_sysattr_value(device, "subsystem", &subsystem);
r = sd_device_get_syspath(device, &syspath);
if (r < 0)
return r;
/* read 'subsystem' link */
path = strjoina(syspath, "/subsystem");
r = readlink_value(path, &subsystem);
if (r < 0 && r != -ENOENT)
return log_device_debug_errno(device, r,
"sd-device: Failed to read subsystem for %s: %m",
device->devpath);
if (r >= 0)
if (subsystem)
r = device_set_subsystem(device, subsystem);
/* use implicit names */
else if (!isempty(path_startswith(device->devpath, "/module/")))
r = device_set_subsystem(device, "module");
else if (strstr(device->devpath, "/drivers/") || endswith(device->devpath, "/drivers"))
else if (strstr(syspath, "/drivers/") || endswith(syspath, "/drivers"))
r = device_set_drivers_subsystem(device);
else if (!isempty(PATH_STARTSWITH_SET(device->devpath, "/class/", "/bus/")))
r = device_set_subsystem(device, "subsystem");
else
r = device_set_subsystem(device, NULL);
else {
device->subsystem_set = true;
r = 0;
}
if (r < 0)
return log_device_debug_errno(device, r,
"sd-device: Failed to set subsystem for %s: %m",
@ -1392,8 +1403,6 @@ int device_set_driver(sd_device *device, const char *driver) {
#if 0 /* NM_IGNORED */
_public_ int sd_device_get_driver(sd_device *device, const char **ret) {
int r;
assert_return(device, -EINVAL);
r = device_read_uevent_file(device);
@ -1401,12 +1410,20 @@ _public_ int sd_device_get_driver(sd_device *device, const char **ret) {
return r;
if (!device->driver_set) {
const char *driver = NULL;
_cleanup_free_ char *driver = NULL;
const char *syspath;
char *path;
int r;
r = sd_device_get_sysattr_value(device, "driver", &driver);
r = sd_device_get_syspath(device, &syspath);
if (r < 0)
return r;
path = strjoina(syspath, "/driver");
r = readlink_value(path, &driver);
if (r < 0 && r != -ENOENT)
return log_device_debug_errno(device, r,
"sd-device: Failed to read driver: %m");
"sd-device: readlink(\"%s\") failed: %m", path);
r = device_set_driver(device, driver);
if (r < 0)