$ git clone -n https://src.fedoraproject.org/rpms/perl-Env-C.git /var/lib/mock/f45-build-23363-597/root/chroot_tmpdir/scmroot/perl-Env-C
Cloning into '/var/lib/mock/f45-build-23363-597/root/chroot_tmpdir/scmroot/perl-Env-C'...
$ git fetch origin 587c4e286626ce19de6c71169d2cc3d1784c5687:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Env-C
 * [new ref]         587c4e286626ce19de6c71169d2cc3d1784c5687 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 587c4e2 Perl 5.44 rebuild