[libcamera-devel] [PATCH] libcamera: sysfs: Fix directory exists check
Niklas Söderlund
niklas.soderlund at ragnatech.se
Fri Jan 8 18:00:42 CET 2021
The scope of File::exists() was changed to only validate that a file
exists and is therefore not usable to check if a directory exists. This
breaks the persistent name generation for DT based systems as it uses
File::exists() to check for directories, fix this by using stat()
directly.
On Scarlet the persistent names of the cameras are impacted by this and
where incorrectly reported as:
$ cam -l
Available cameras:
1: Internal front camera (platform/ff160000.i2c/i2c-7/7-003c ov2685)
2: Internal front camera (platform/ff160000.i2c/i2c-7/7-0036 ov5695
While the expected ones are restored with this fix:
$ cam -l
Available cameras:
1: Internal front camera (/base/i2c at ff160000/camera at 3c)
2: Internal front camera (/base/i2c at ff160000/camera at 36)
Fixes: 8f4e16f014c820a0 ("test: file: Check that directories are not treated as files")
Signed-off-by: Niklas Söderlund <niklas.soderlund at ragnatech.se>
---
src/libcamera/sysfs.cpp | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/src/libcamera/sysfs.cpp b/src/libcamera/sysfs.cpp
index 3ebe66f8d69b61d4..e9004b2b59c8638d 100644
--- a/src/libcamera/sysfs.cpp
+++ b/src/libcamera/sysfs.cpp
@@ -70,10 +70,11 @@ std::string charDevPath(const std::string &deviceNode)
std::string firmwareNodePath(const std::string &device)
{
std::string fwPath, node;
+ struct stat st;
/* Lookup for DT-based systems */
node = device + "/of_node";
- if (File::exists(node)) {
+ if (!stat(node.c_str(), &st)) {
char *ofPath = realpath(node.c_str(), nullptr);
if (!ofPath)
return {};
--
2.30.0
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