$ git clone -n https://src.fedoraproject.org/rpms/perl-Test-Simple.git /var/lib/mock/f45-build-26856-619/root/chroot_tmpdir/scmroot/perl-Test-Simple
Cloning into '/var/lib/mock/f45-build-26856-619/root/chroot_tmpdir/scmroot/perl-Test-Simple'...
$ git fetch origin e3f31c8331aabe9922caa4cf49008649e16b5ec0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Test-Simple
 * [new ref]         e3f31c8331aabe9922caa4cf49008649e16b5ec0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e3f31c8 Update to 1.302224