set value for NSURLAttributeModificationDateKey fails

Originator:pzabelin
Number:rdar://23679944 Date Originated:2015-11-28
Status:Closed Resolved:2016-07-08
Product:iOS SDK Product Version:8.0
Classification:Documentation bug Reproducible:Always
 
fileUrl.setResourceValue(referenceDate, forKey: NSURLAttributeModificationDateKey) silently fails to set new date

Comments

Engineering has the following feedback for you: Documentation bug.

NSURLAttributeModificationDateKey, kCFURLAttributeModificationDateKey, and ATTR_CMN_CHGTIME are all read only. We’ve fixed the header file comments (this bug covers those changes). We’ve filed these new bug reports to fix the documentation: NSURLAttributeModificationDateKey and kCFURLAttributeModificationDateKey are read-only ATTR_CMN_CHGTIME is read-only -- getattrlist man page says it is read-write. Please provide your response or results by updating your bug report and compress any bundled files (e.g. nested folders) prior to uploading.

By pzabelin at April 11, 2019, 11:59 a.m. (reply...)

iOS 9.3 SDK headers are not updated

We just received Xcode7.3 with iOS 9.3 SDK

It contains NSURL.h, which states that NSURLAttributeModificationDateKey is Read-write:

FOUNDATION_EXPORT NSString * const NSURLAttributeModificationDateKey NS_AVAILABLE(10_6, 4_0); // The time the resource's attributes were last modified (Read-write, value type NSDate)

Also ATTR_CMN_CHGTIME documented as read/write in iOS man pages in Xcode Documentation: 

 ATTR_CMN_CHGTIME          (read/write) A timespec structure containing
                           the time that the file system object's
                           attributes were last modified.  Equivalent to
                           the st_ctimespec field of the stat structure
                           returned by stat(2).
By pzabelin at March 30, 2016, 5:29 a.m. (reply...)

Apple Engineering has provided the following feedback regarding this issue:

The NSURLAttributeModificationDateKey property is actually read-only and the comments in the header file have been changed to reflect this. NSURLAttributeModificationDateKey returns the value from getattrlist’s ATTR_CMN_CHGTIME attribute which is documented as “ATTR_CMN_CHGTIME cannot be set programmatically. Any attempt to set change time is ignored.”

By pzabelin at March 30, 2016, 5:28 a.m. (reply...)

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