$ git clone -n https://src.fedoraproject.org/rpms/rust-tracing-core.git /var/lib/mock/f39-build-1521219-35836/root/chroot_tmpdir/scmroot/rust-tracing-core
Cloning into '/var/lib/mock/f39-build-1521219-35836/root/chroot_tmpdir/scmroot/rust-tracing-core'...
$ git fetch origin 42269e14deb9b4ccf3bdf25c6e73c5bde5b6d680:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-tracing-core
 * [new ref]         42269e14deb9b4ccf3bdf25c6e73c5bde5b6d680 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 42269e1 Update to version 0.1.32; Fixes RHBZ#2244137