It passes when run with only packages from testing.
This is not entirely correct, the version of rust-utf-8 in testing has no autopkgtests at all. So this is a case of a newly added (by a newer version of debcargo) test failing, not a case of an existing test regressing. Investigating, it seems the reason for the failure is that the crate is installed in the wrong place. It is installed in /usr/share/cargo/registry/utf-0.7.6/ when it should be installed in /usr/share/cargo/registry/utf-8-0.7.6/ The reason it's installed in the wrong place is that dh-cargo by default determines the crate name from the source package name, but source package names are ambiguous "rust-utf-8" could mean a crate called "utf" with a major version of 8 or it could (and actually does in this case) mean a crate called utf-8. dh-cargo allows a package to specify an explicit crate name through X-Cargo-Crate in the source section of the control file but debcargo seems to offer no way to set this other than overriding the complete control file. There is no mention of X-Cargo-Crate in the debcargo source and the mechanism for adding arbitrary lines to the generated control file only applies to binary package sections. This also affects rust-md-5 and rust-sha-1, though neither of those packages are currently in testing and rust-sha-1 has not had an upload since debcargo started doing autopkgtests I see a number of possible ways of solving the issue. 1. Just override the whole control file (debcargo rightly discourages this due to the maintenance burden it creates, but OTOH this issue only affects three crates) 2. Add support for adding arbitrary lines to the source section of debian/control in debcargo and use it to manually add X-Cargo-Crate 3. Modify dh-cargo to obtain the crate name from Cargo.toml instead of the package name. (would presumablly mean dragging in a perl toml parser which may not be desirable) 4. Modify debcargo to generate X-Cargo-Crate lines in cases where dh-cargo would otherwise get the wrong crate name. 5. Modify debcargo to generate X-Cargo-Crate lines unconditionally
