$ git clone -n https://src.fedoraproject.org/rpms/perl-Filesys-Statvfs.git /var/lib/mock/f45-build-23630-598/root/chroot_tmpdir/scmroot/perl-Filesys-Statvfs
Cloning into '/var/lib/mock/f45-build-23630-598/root/chroot_tmpdir/scmroot/perl-Filesys-Statvfs'...
$ git fetch origin 1bc9bbbd5f21e65424793e4ca4fe2b48f91ebed2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Filesys-Statvfs
 * [new ref]         1bc9bbbd5f21e65424793e4ca4fe2b48f91ebed2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1bc9bbb Perl 5.44 rebuild