$ git clone -n https://src.fedoraproject.org/rpms/perl-NetAddr-IP.git /var/lib/mock/f45-build-25457-611/root/chroot_tmpdir/scmroot/perl-NetAddr-IP
Cloning into '/var/lib/mock/f45-build-25457-611/root/chroot_tmpdir/scmroot/perl-NetAddr-IP'...
$ git fetch origin ba4f96f86f7f04d39f1c6721e3cf8586b5c20d32:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-NetAddr-IP
 * [new ref]         ba4f96f86f7f04d39f1c6721e3cf8586b5c20d32 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ba4f96f Perl 5.44 rebuild