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Add SENSORS_SYSFS_ROOT environment support

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With this the hardcoded /sys location for reading sensor data can be
changed. In particular it makes it possible to tar up the /sys directory
when a problem is encountered, and then reproduce it on another system.

Signed-off-by: Michal Suchanek <msuchanek@suse.de>
This commit is contained in:
Michal Suchanek
2024-01-07 21:20:39 +01:00
parent 25108fe4a4
commit 89548dab2a
2 changed files with 27 additions and 4 deletions
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lib/sysfs.c
+26 -3
View File
@@ -136,7 +136,7 @@ static int sysfs_foreach_busdev(const char *bus_type,
/****************************************************************************/
char sensors_sysfs_mount[NAME_MAX];
const char *sensors_sysfs_mount = "/sys";
static
int get_type_scaling(sensors_subfeature_type type)
@@ -730,12 +730,35 @@ exit_free:
int sensors_init_sysfs(void)
{
struct statfs statfsbuf;
struct stat statbuf;
const char *sysfs_root_env = getenv("SENSORS_SYSFS_ROOT");
const char *hwmon_subdir = "/class/hwmon";
char *hwmon_path;
size_t length;
int result;
if (sysfs_root_env)
sensors_sysfs_mount = sysfs_root_env;
snprintf(sensors_sysfs_mount, NAME_MAX, "%s", "/sys");
if (statfs(sensors_sysfs_mount, &statfsbuf) < 0
|| statfsbuf.f_type != SYSFS_MAGIC)
|| statfsbuf.f_type != SYSFS_MAGIC) {
if (sysfs_root_env)
fprintf(stderr, "%s: Not a sysfs mount.\n", sensors_sysfs_mount);
else
return 0;
}
length = strlen(sensors_sysfs_mount) + strlen(hwmon_subdir) + 1;
hwmon_path = malloc(length);
if (!hwmon_path)
return 0;
snprintf(hwmon_path, length, "%s%s", sensors_sysfs_mount, hwmon_subdir);
result = !stat(hwmon_path, &statbuf) && ((statbuf.st_mode & S_IFMT) == S_IFDIR);
if (!result)
fprintf(stderr, "%s: No sensors at %s.\n", sensors_sysfs_mount, hwmon_path);
free(hwmon_path);
return 1;
}
lib/sysfs.h
+1 -1
View File
@@ -22,7 +22,7 @@
#ifndef LIB_SENSORS_SYSFS_H
#define LIB_SENSORS_SYSFS_H
extern char sensors_sysfs_mount[];
extern const char *sensors_sysfs_mount;
int sensors_init_sysfs(void);