$ git clone -n https://src.fedoraproject.org/rpms/perl-STD.git /var/lib/mock/f41-build-1146535-21197/root/chroot_tmpdir/scmroot/perl-STD
Cloning into '/var/lib/mock/f41-build-1146535-21197/root/chroot_tmpdir/scmroot/perl-STD'...
$ git fetch origin 542b9ecd4820f06560bbda783f4db7121e820569:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-STD
 * [new ref]         542b9ecd4820f06560bbda783f4db7121e820569 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 542b9ec Eliminate use of obsolete %patchN syntax (#2283636)