$ git clone -n https://src.fedoraproject.org/rpms/media-downloader.git /var/lib/mock/f39-build-2239644-53619/root/chroot_tmpdir/scmroot/media-downloader
Cloning into '/var/lib/mock/f39-build-2239644-53619/root/chroot_tmpdir/scmroot/media-downloader'...
$ git fetch origin 654e64d08113140cbcccf1b1f0dd17836498b54b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/media-downloader
 * [new ref]         654e64d08113140cbcccf1b1f0dd17836498b54b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 654e64d Remove RR youtube-dl