$ git clone -n https://src.fedoraproject.org/rpms/msmtp.git /var/lib/mock/f40-build-2012105-45770/root/chroot_tmpdir/scmroot/msmtp
Cloning into '/var/lib/mock/f40-build-2012105-45770/root/chroot_tmpdir/scmroot/msmtp'...
$ git fetch origin 8cd757855c73cc51cebb02c95ed064677a7ced49:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/msmtp
 * [new ref]         8cd757855c73cc51cebb02c95ed064677a7ced49 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8cd7578 msmtp ver. 1.8.25