$ git clone -n https://src.fedoraproject.org/rpms/fmt.git /var/lib/mock/f41-build-856646-167725/root/chroot_tmpdir/scmroot/fmt
Cloning into '/var/lib/mock/f41-build-856646-167725/root/chroot_tmpdir/scmroot/fmt'...
$ git fetch origin 59b0ef1741dc0a9288beb66ea613a822bc98cc83:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/fmt
 * [new ref]         59b0ef1741dc0a9288beb66ea613a822bc98cc83 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 59b0ef1 Backport fix for build with tip-of-tree Clang