$ git clone -n https://src.fedoraproject.org/rpms/perl-EV-Glib.git /var/lib/mock/f41-build-852817-166493/root/chroot_tmpdir/scmroot/perl-EV-Glib
Cloning into '/var/lib/mock/f41-build-852817-166493/root/chroot_tmpdir/scmroot/perl-EV-Glib'...
$ git fetch origin 6787de497053cbf106de0627e1a5e9226b0a1ec8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-EV-Glib
 * [new ref]         6787de497053cbf106de0627e1a5e9226b0a1ec8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6787de4 Build failed on i686.