$ git clone -n https://src.fedoraproject.org/rpms/perl-B-Generate.git /var/lib/mock/f45-build-21834-588/root/chroot_tmpdir/scmroot/perl-B-Generate
Cloning into '/var/lib/mock/f45-build-21834-588/root/chroot_tmpdir/scmroot/perl-B-Generate'...
$ git fetch origin 063ef495da5a77edc2b3440a489e4c628e0bf077:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-B-Generate
 * [new ref]         063ef495da5a77edc2b3440a489e4c628e0bf077 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 063ef49 Perl 5.44 rebuild