[Bug 2124697] Review Request: libblkio - Block device I/O library

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https://bugzilla.redhat.com/show_bug.cgi?id=2124697



--- Comment #63 from Fabio Valentini <decathorpe@xxxxxxxxx> ---
Why didn't you do the same for pre-1.0 versions? The same restrictions apply
there.

For example, the "nix" crate will likely be updated to version 0.25.0 soon, and
using the >= 0.24.2 requirement you have now, doing that would break this
package (as it would start to pull in rust-nix-0.25, making the build of this
package fail with missing dependency on nix v0.24).

Instead, use "(crate(nix/default) >= 0.24.2 with crate(nix/default) < 0.25~)"
so that this package will continue pulling in the nix v0.24 compat package once
the main nix package is updated to v0.25.

As I mentioned, cargo-semver provides stronger compatibility guarantees than
plain semver in this regard (for pre-1.0-versions), as patch releases in the
0.24.x series are supposed to be compatible with each other - but minor
releases of pre-1.0 versions are treated just like "major" version changes
(i.e. something like v0.24 -> v0.25).

The only range of versions where "exact" requirements are fine are for
pre-0.1-versions like "0.0.x", where a change from "0.0.x" to "0.0.x+1" conveys
a breaking change, as well (if you discount pre-releases).


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