$ git clone -n https://src.fedoraproject.org/rpms/perl-smartmatch.git /var/lib/mock/f45-build-27747-625/root/chroot_tmpdir/scmroot/perl-smartmatch
Cloning into '/var/lib/mock/f45-build-27747-625/root/chroot_tmpdir/scmroot/perl-smartmatch'...
$ git fetch origin f170c62c4644f09cb3d5634db04e2bd58d8fba82:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-smartmatch
 * [new ref]         f170c62c4644f09cb3d5634db04e2bd58d8fba82 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f170c62 Perl 5.44 rebuild