$ git clone -n https://src.fedoraproject.org/rpms/rust-tracing-core.git /var/lib/mock/f45-build-45604-824/root/chroot_tmpdir/scmroot/rust-tracing-core
Cloning into '/var/lib/mock/f45-build-45604-824/root/chroot_tmpdir/scmroot/rust-tracing-core'...
$ git fetch origin 39bed60c844b5c5dec1a909a0d47d92d11f14c03:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-tracing-core
 * [new ref]         39bed60c844b5c5dec1a909a0d47d92d11f14c03 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 39bed60 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild