$ git clone -n https://src.fedoraproject.org/rpms/perl-Sys-Syslog.git /var/lib/mock/f40-build-2229753-53177/root/chroot_tmpdir/scmroot/perl-Sys-Syslog
Cloning into '/var/lib/mock/f40-build-2229753-53177/root/chroot_tmpdir/scmroot/perl-Sys-Syslog'...
$ git fetch origin b234ce1afa8d1083076b373eca35bf3b471ed24f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Sys-Syslog
 * [new ref]         b234ce1afa8d1083076b373eca35bf3b471ed24f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b234ce1 Package tests