$ git clone -n https://src.fedoraproject.org/rpms/rubygem-shoulda-matchers.git /var/lib/mock/f42-build-3494551-45873/root/chroot_tmpdir/scmroot/rubygem-shoulda-matchers
Cloning into '/var/lib/mock/f42-build-3494551-45873/root/chroot_tmpdir/scmroot/rubygem-shoulda-matchers'...
$ git fetch origin 29392f4fb8add16e2640640059066ca18cde41b0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-shoulda-matchers
 * [new ref]         29392f4fb8add16e2640640059066ca18cde41b0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 29392f4 Enable sqlite3 2.x+