$ git clone -n https://src.fedoraproject.org/rpms/mozjs115.git /var/lib/mock/f41-build-1022481-18078/root/chroot_tmpdir/scmroot/mozjs115
Cloning into '/var/lib/mock/f41-build-1022481-18078/root/chroot_tmpdir/scmroot/mozjs115'...
$ git fetch origin 0efa8f179746c459df2b33c046482e0cd8f5a947:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mozjs115
 * [new ref]         0efa8f179746c459df2b33c046482e0cd8f5a947 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0efa8f1 mozjs115-115.12.0 (RHBZ#2264868)