tree 1a7bfc27be44c299ce58d108a7870113635b8a78
parent c4995df81472b5c11abcc736f23fba8ac3eef322
author Googler <noreply@google.com> 1570557407 +0000
committer Ivan Hernandez <ivanhernandez@google.com> 1570669913 +0000

Do not assume that CopyOnWrite arguments reside on the root filesystem.

We can only do a CoW if the source and destination paths are on the same
APFS volume. Checking that the root volume is APFS is not sufficient.

TESTED=Manual testing on a MacBook with an APFS root volume and a FUSE
mount; we cannot easily automate a test since we can't assume the types
and mount points of filesystems on our automated test machines.
PiperOrigin-RevId: 273558974