$ git clone -n https://src.fedoraproject.org/rpms/ffmpegthumbs.git /var/lib/mock/f41-build-860052-168769/root/chroot_tmpdir/scmroot/ffmpegthumbs
Cloning into '/var/lib/mock/f41-build-860052-168769/root/chroot_tmpdir/scmroot/ffmpegthumbs'...
$ git fetch origin b40ce62b46832165f5fd026c52ba0d1d728d8cac:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ffmpegthumbs
 * [new ref]         b40ce62b46832165f5fd026c52ba0d1d728d8cac -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b40ce62 24.08.2