$ git clone -n https://src.fedoraproject.org/rpms/compiler-rt17.git /var/lib/mock/f40-build-799399-142330/root/chroot_tmpdir/scmroot/compiler-rt17
Cloning into '/var/lib/mock/f40-build-799399-142330/root/chroot_tmpdir/scmroot/compiler-rt17'...
$ git fetch origin 0b75f0740d912e4571aa2e6e7fd739ad51268240:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/compiler-rt17
 * [new ref]         0b75f0740d912e4571aa2e6e7fd739ad51268240 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0b75f07 Depend on clang-resource-filesystem from clang compat