$ git clone -n https://src.fedoraproject.org/rpms/libexttextcat.git /var/lib/mock/f45-build-16153-483/root/chroot_tmpdir/scmroot/libexttextcat
Cloning into '/var/lib/mock/f45-build-16153-483/root/chroot_tmpdir/scmroot/libexttextcat'...
$ git fetch origin e6e27a3177f52be41ee507d388bccc43a5ec2109:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libexttextcat
 * [new ref]         e6e27a3177f52be41ee507d388bccc43a5ec2109 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e6e27a3 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild