$ git clone -n https://src.fedoraproject.org/rpms/digikam.git /var/lib/mock/f40-build-2197288-51636/root/chroot_tmpdir/scmroot/digikam
Cloning into '/var/lib/mock/f40-build-2197288-51636/root/chroot_tmpdir/scmroot/digikam'...
$ git fetch origin 35abd4d8d5052414b06455c647fc7fcfcc0ebf26:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/digikam
 * [new ref]         35abd4d8d5052414b06455c647fc7fcfcc0ebf26 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 35abd4d Rebuild (libksane)