$ git clone -n https://src.fedoraproject.org/rpms/geary.git /var/lib/mock/f42-build-861917-170476/root/chroot_tmpdir/scmroot/geary
Cloning into '/var/lib/mock/f42-build-861917-170476/root/chroot_tmpdir/scmroot/geary'...
$ git fetch origin f49710f9a5bf2503af1614ed3e1b21bb3eb91276:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/geary
 * [new ref]         f49710f9a5bf2503af1614ed3e1b21bb3eb91276 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f49710f Rebuild for ICU 76