$ git clone -n https://src.fedoraproject.org/rpms/mozjs91.git /var/lib/mock/f41-build-1312753-23509/root/chroot_tmpdir/scmroot/mozjs91
Cloning into '/var/lib/mock/f41-build-1312753-23509/root/chroot_tmpdir/scmroot/mozjs91'...
$ git fetch origin eed5afd731ad5e55eba84516cb3ac5adde0db6c1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mozjs91
 * [new ref]         eed5afd731ad5e55eba84516cb3ac5adde0db6c1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at eed5afd Add ICU 74.2 expected failures (Fixes RHBZ#2261392)