$ git clone -n https://src.fedoraproject.org/rpms/rust-enumflags2.git /var/lib/mock/f39-build-1517097-35684/root/chroot_tmpdir/scmroot/rust-enumflags2
Cloning into '/var/lib/mock/f39-build-1517097-35684/root/chroot_tmpdir/scmroot/rust-enumflags2'...
$ git fetch origin af54c36ad15f01594ab94383ac8dd5a745be63f1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-enumflags2
 * [new ref]         af54c36ad15f01594ab94383ac8dd5a745be63f1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at af54c36 Update to version 0.7.8; Fixes RHBZ#2238860