$ git clone -n https://src.fedoraproject.org/rpms/pidgin.git /var/lib/mock/f42-build-side-1-3505167-45989/root/chroot_tmpdir/scmroot/pidgin
Cloning into '/var/lib/mock/f42-build-side-1-3505167-45989/root/chroot_tmpdir/scmroot/pidgin'...
$ git fetch origin 86e44248589aa8e054746bb211a665d396e9f864:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/pidgin
 * [new ref]         86e44248589aa8e054746bb211a665d396e9f864 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 86e4424 Add explicit BR: libxcrypt-devel