$ git clone -n https://src.fedoraproject.org/rpms/ghc-texmath.git /var/lib/mock/f45-build-10830-424/root/chroot_tmpdir/scmroot/ghc-texmath
Cloning into '/var/lib/mock/f45-build-10830-424/root/chroot_tmpdir/scmroot/ghc-texmath'...
$ git fetch origin b4e78bdd94056af4e45559550e6b8147ea00df2e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-texmath
 * [new ref]         b4e78bdd94056af4e45559550e6b8147ea00df2e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b4e78bd Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild