$ git clone -n https://src.fedoraproject.org/rpms/mozjs91.git /var/lib/mock/f37-build-639928-71352/root/chroot_tmpdir/scmroot/mozjs91
Cloning into '/var/lib/mock/f37-build-639928-71352/root/chroot_tmpdir/scmroot/mozjs91'...
$ git reset --hard cdfc5154129cc925abe4e429171f90b07b1b7b3b
HEAD is now at cdfc515 mozjs91-91.13.0