$ git clone -n https://src.fedoraproject.org/rpms/perl-Gnome2-Vte.git /var/lib/mock/f41-build-816645-150311/root/chroot_tmpdir/scmroot/perl-Gnome2-Vte
Cloning into '/var/lib/mock/f41-build-816645-150311/root/chroot_tmpdir/scmroot/perl-Gnome2-Vte'...
$ git fetch origin c25108c700fba3a6eb8274568738e2b480611bd5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Gnome2-Vte
 * [new ref]         c25108c700fba3a6eb8274568738e2b480611bd5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c25108c Perl 5.40 rebuild