$ git clone -n https://src.fedoraproject.org/rpms/perl-Imager.git /var/lib/mock/f40-build-752669-116818/root/chroot_tmpdir/scmroot/perl-Imager
Cloning into '/var/lib/mock/f40-build-752669-116818/root/chroot_tmpdir/scmroot/perl-Imager'...
$ git fetch origin a25342c5f810ce15f0fd3b3e8df71f8c4e7e1162:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Imager
 * [new ref]         a25342c5f810ce15f0fd3b3e8df71f8c4e7e1162 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a25342c 1.021 bump (rhbz#2252370)