$ git clone -n https://src.fedoraproject.org/rpms/autoconf.git /var/lib/mock/f42-build-3285394-41413/root/chroot_tmpdir/scmroot/autoconf
Cloning into '/var/lib/mock/f42-build-3285394-41413/root/chroot_tmpdir/scmroot/autoconf'...
$ git fetch origin ed0006c2cbc5f2b9a568165a2734356081d625ff:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/autoconf
 * [new ref]         ed0006c2cbc5f2b9a568165a2734356081d625ff -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ed0006c Backport: Keep "-lmingwex" and "-lmoldname" in linker flags for MinGW