$ git clone -n https://src.fedoraproject.org/rpms/rubygem-activesupport.git /var/lib/mock/f39-build-1597854-38466/root/chroot_tmpdir/scmroot/rubygem-activesupport
Cloning into '/var/lib/mock/f39-build-1597854-38466/root/chroot_tmpdir/scmroot/rubygem-activesupport'...
$ git fetch origin d4a62b64c21eb379274cdd02bd576b58f1bf76a9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-activesupport
 * [new ref]         d4a62b64c21eb379274cdd02bd576b58f1bf76a9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d4a62b6 Update to activesupport 7.0.8