$ git clone -n https://src.fedoraproject.org/rpms/jaxb-istack-commons.git /var/lib/mock/f40-build-2524981-61810/root/chroot_tmpdir/scmroot/jaxb-istack-commons
Cloning into '/var/lib/mock/f40-build-2524981-61810/root/chroot_tmpdir/scmroot/jaxb-istack-commons'...
$ git fetch origin 1bccbe671e15ceea588ba08359b50737f70b9038:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/jaxb-istack-commons
 * [new ref]         1bccbe671e15ceea588ba08359b50737f70b9038 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1bccbe6 Rebuilt for java-21-openjdk as system jdk