$ git clone -n https://src.fedoraproject.org/rpms/bootc.git /var/lib/mock/f41-build-side-1-3065394-38603/root/chroot_tmpdir/scmroot/bootc
Cloning into '/var/lib/mock/f41-build-side-1-3065394-38603/root/chroot_tmpdir/scmroot/bootc'...
$ git fetch origin 2f38da13040b2444fbcb6b49f7fa10b8fe94549c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/bootc
 * [new ref]         2f38da13040b2444fbcb6b49f7fa10b8fe94549c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2f38da1 Upgrade to 1.1.0