$ git clone -n https://src.fedoraproject.org/rpms/R-gitcreds.git /var/lib/mock/f40-build-1944433-25177/root/chroot_tmpdir/scmroot/R-gitcreds
Cloning into '/var/lib/mock/f40-build-1944433-25177/root/chroot_tmpdir/scmroot/R-gitcreds'...
$ git fetch origin 2e567c86c078bf825bb3f9746335433c720cdaa4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-gitcreds
 * [new ref]         2e567c86c078bf825bb3f9746335433c720cdaa4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2e567c8 R-maint-sig mass rebuild