I have file paths in one side and their new paths where I want to duplicate them.
How to test whether they can be simply hardlinked or they should be copied?
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I have file paths in one side and their new paths where I want to duplicate them.
How to test whether they can be simply hardlinked or they should be copied?
Step 1: Call link.
Step 2: If it returns -1 with
errnoset toEXDEV, then make a copy.[update]
In general, there is no portable (and reliable) way to answer this question. The closest you can get, I think, is to call statvfs for the source and destination and then compare the
f_fsidfields of the statvfs structures.Unfortunately, POSIX does not guarantee anything in particular about the
f_fsidfield. This test should work on Linux unless maybe you are asking about NFS-mounted filesystems…