$ git clone -n https://src.fedoraproject.org/rpms/gimagereader.git /var/lib/mock/f42-build-864546-172426/root/chroot_tmpdir/scmroot/gimagereader
Cloning into '/var/lib/mock/f42-build-864546-172426/root/chroot_tmpdir/scmroot/gimagereader'...
$ git fetch origin 68807cbdadd1dbf394964a8297df18f0010065ab:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gimagereader
 * [new ref]         68807cbdadd1dbf394964a8297df18f0010065ab -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 68807cb Rebuild (tesseract)