$ git clone -n https://src.fedoraproject.org/rpms/mutter.git /var/lib/mock/f41-build-825949-154799/root/chroot_tmpdir/scmroot/mutter
Cloning into '/var/lib/mock/f41-build-825949-154799/root/chroot_tmpdir/scmroot/mutter'...
$ git fetch origin db8d97d254a0c561c4d151309e7c7ca19d18ebb0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mutter
 * [new ref]         db8d97d254a0c561c4d151309e7c7ca19d18ebb0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at db8d97d Backport MR #3848 to fix build with libdrm >= 2.4.122