tests: failover to copying when symlinking fails #8992
Merged
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Symlinking busybox may fail when the test code and the test temporary
directory live on different volumes/partitions; so we should copy
instead. This situation arises in the Vagrant setup, where the code
repository live on special file sharing volume.
Somewhat unrelated, remove
f.Sync()
invocation from a test copyFilehelper function. Sync is useful only for crash recovery, and isn't
necessary in our test setup. The sync invocation is a significant
overhead as it requires the OS to flush any cached writes to disk.
Related to #8970