$ git clone -n https://src.fedoraproject.org/rpms/perl-Digest-SHA1.git /var/lib/mock/f40-build-2202001-51865/root/chroot_tmpdir/scmroot/perl-Digest-SHA1
Cloning into '/var/lib/mock/f40-build-2202001-51865/root/chroot_tmpdir/scmroot/perl-Digest-SHA1'...
$ git fetch origin a711414b1695d3af09c138e286790f3809ee5d16:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Digest-SHA1
 * [new ref]         a711414b1695d3af09c138e286790f3809ee5d16 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a711414 Package tests; Modernize spec