Added the module github.com/crc-org/crc/ as a dependency.
Updated `decompress.go` and `copy_test.go` in compression
so that `CopySparse` from crc-org/crc/v2/pkg/os is used instead
of the local version in `copy.go`.
Deleted `copy.go` that is not used anymore.
Signed-off-by: Mario Loriedo <mario.loriedo@gmail.com>
gz by definition is not able to preserve the sparse nature of files. using some code from the crc project and gluing it together with our decompression code, we can re-create the sparseness of a file. one downside is the operation is a little bit slower, but i think the gains from the sparse file are well worth it in IO alone.
there are a number of todo's in this PR that would be ripe for quick hitting fixes.
[NO NEW TESTS NEEDED]
Signed-off-by: Brent Baude <baude@redhat.com>