$ git clone -n https://src.fedoraproject.org/rpms/xstdcmap.git /var/lib/mock/f45-build-39120-732/root/chroot_tmpdir/scmroot/xstdcmap
Cloning into '/var/lib/mock/f45-build-39120-732/root/chroot_tmpdir/scmroot/xstdcmap'...
$ git fetch origin 10499230105aae2ec0868e7e669c95ebe3ebdcbe:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xstdcmap
 * [new ref]         10499230105aae2ec0868e7e669c95ebe3ebdcbe -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1049923 update sources + gpg