$ git clone -n https://src.fedoraproject.org/rpms/rubygem-redcarpet.git /var/lib/mock/f42-build-865206-172845/root/chroot_tmpdir/scmroot/rubygem-redcarpet
Cloning into '/var/lib/mock/f42-build-865206-172845/root/chroot_tmpdir/scmroot/rubygem-redcarpet'...
$ git fetch origin 39714be8132ce4956508675ed439935a34ff875f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-redcarpet
 * [new ref]         39714be8132ce4956508675ed439935a34ff875f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 39714be Rebuild for https://fedoraproject.org/wiki/Changes/Ruby_3.4