Description of problem:
rust-src requires /usr/bin/python2

Version-Release number of selected component (if applicable):
rust-src-0:1.27.1-2.fc29


[~]$ dnf repoquery --requires rust-src
/bin/bash
/bin/sh
/usr/bin/bash
/usr/bin/python2

From the build logs of rust-1.27.1-3.fc29:

+ /usr/lib/rpm/redhat/brp-mangle-shebangs
*** WARNING: ./usr/lib/rustlib/src/rust/src/stdsimd/ci/run-docker.sh is executable but has empty or no shebang, removing executable bit
mangling shebang in /usr/lib/rustlib/src/rust/src/liblibc/ci/emscripten-entry.sh from /usr/bin/env bash to #!/usr/bin/bash
*** WARNING: ./usr/lib/rustlib/src/rust/src/liblibc/ci/run-docker.sh is executable but has empty or no shebang, removing executable bit
*** WARNING: mangling shebang in /usr/lib/rustlib/src/rust/src/jemalloc/scripts/gen_travis.py from #!/usr/bin/env python to #!/usr/bin/python2. This will become an ERROR, fix it manually!
*** WARNING: mangling shebang in /usr/lib/rustlib/src/rust/src/libcore/unicode/unicode.py from #!/usr/bin/env python to #!/usr/bin/python2. This will become an ERROR, fix it manually!
*** WARNING: ./usr/lib/rustlib/src/rust/src/libcompiler_builtins/ci/run.sh is executable but has empty or no shebang, removing executable bit
*** WARNING: mangling shebang in /usr/lib/rustlib/src/rust/src/libcompiler_builtins/compiler-rt/lib/dfsan/scripts/build-libc-list.py from #!/usr/bin/env python to #!/usr/bin/python2. This will become an ERROR, fix it manually!
*** WARNING: mangling shebang in /usr/lib/rustlib/src/rust/src/libcompiler_builtins/compiler-rt/lib/asan/scripts/asan_symbolize.py from #!/usr/bin/env python to #!/usr/bin/python2. This will become an ERROR, fix it manually!
*** WARNING: mangling shebang in /usr/lib/rustlib/src/rust/src/libcompiler_builtins/compiler-rt/lib/fuzzer/scripts/unbalanced_allocs.py from #!/usr/bin/env python to #!/usr/bin/python2. This will become an ERROR, fix it manually!
*** WARNING: mangling shebang in /usr/lib/rustlib/src/rust/src/libcompiler_builtins/compiler-rt/lib/sanitizer_common/scripts/sancov.py from #!/usr/bin/env python to #!/usr/bin/python2. This will become an ERROR, fix it manually!
*** WARNING: mangling shebang in /usr/lib/rustlib/src/rust/src/libcompiler_builtins/compiler-rt/lib/sanitizer_common/scripts/litlint.py from #!/usr/bin/env python to #!/usr/bin/python2. This will become an ERROR, fix it manually!
*** WARNING: mangling shebang in /usr/lib/rustlib/src/rust/src/libcompiler_builtins/compiler-rt/lib/sanitizer_common/scripts/cpplint.py from #!/usr/bin/env python to #!/usr/bin/python2. This will become an ERROR, fix it manually!
*** WARNING: mangling shebang in /usr/lib/rustlib/src/rust/src/libcompiler_builtins/compiler-rt/lib/sanitizer_common/scripts/gen_dynamic_list.py from #!/usr/bin/env python to #!/usr/bin/python2. This will become an ERROR, fix it manually!
*** WARNING: mangling shebang in /usr/lib/rustlib/src/rust/src/libcompiler_builtins/compiler-rt/lib/sanitizer_common/scripts/litlint_test.py from #!/usr/bin/python to #!/usr/bin/python2. This will become an ERROR, fix it manually!

https://koji.fedoraproject.org/koji/buildinfo?buildID=1124691


Maybe the shebangs need to be changed to /usr/bin/python3 instead?