$ git clone -n https://src.fedoraproject.org/rpms/rubygem-ejs.git /var/lib/mock/f39-build-1490331-34506/root/chroot_tmpdir/scmroot/rubygem-ejs
Cloning into '/var/lib/mock/f39-build-1490331-34506/root/chroot_tmpdir/scmroot/rubygem-ejs'...
$ git fetch origin b3d2d8b10a74f9598c0bf301429d7993ba2f6b1f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-ejs
 * [new ref]         b3d2d8b10a74f9598c0bf301429d7993ba2f6b1f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b3d2d8b Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild