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0c74d2449d
The new version of tar enables the creation of sparse tar archives by default. The ability to read such sparse entries was added in tar 0.4.6, which has been in use starting from Cargo 0.13 and Rust 1.12. Additionally, `docker cp` doesn't support sparse tar entries in the GNU format. For compatibility with older versions of Rust and Cargo, as well as with `docker cp`, this commit disables sparse archive creation in the corresponding cases where the `tar::Builder` is used. See #14594.
WARNING: You might not want to use this outside of Cargo.
- This is designed for testing Cargo itself. Use at your own risk.
- No guarantee on any stability across versions.
- No feature request would be accepted unless proved useful for testing Cargo.