$ git clone -n https://src.fedoraproject.org/rpms/ghc-language-ecmascript.git /var/lib/mock/f39-build-1712623-41228/root/chroot_tmpdir/scmroot/ghc-language-ecmascript
Cloning into '/var/lib/mock/f39-build-1712623-41228/root/chroot_tmpdir/scmroot/ghc-language-ecmascript'...
$ git fetch origin d6a0b77e0b17aa7414982378c62a7d3b32964660:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-language-ecmascript
 * [new ref]         d6a0b77e0b17aa7414982378c62a7d3b32964660 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d6a0b77 bump base bound