$ git clone -n https://src.fedoraproject.org/rpms/echo-icon-theme.git /var/lib/mock/f45-build-7936-371/root/chroot_tmpdir/scmroot/echo-icon-theme
Cloning into '/var/lib/mock/f45-build-7936-371/root/chroot_tmpdir/scmroot/echo-icon-theme'...
$ git fetch origin 6153a73da3064578ed622812553ea01eb1bec81a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/echo-icon-theme
 * [new ref]         6153a73da3064578ed622812553ea01eb1bec81a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6153a73 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild