$ git clone -n https://src.fedoraproject.org/rpms/pastebinit.git /var/lib/mock/f45-build-21422-584/root/chroot_tmpdir/scmroot/pastebinit
Cloning into '/var/lib/mock/f45-build-21422-584/root/chroot_tmpdir/scmroot/pastebinit'...
$ git fetch origin 3af01ca8b7e814d81eeaf28b5b6bf982ca8dbd87:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/pastebinit
 * [new ref]         3af01ca8b7e814d81eeaf28b5b6bf982ca8dbd87 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3af01ca Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild