$ git clone -n https://src.fedoraproject.org/rpms/rubygem-cairo.git /var/lib/mock/f40-build-777900-129623/root/chroot_tmpdir/scmroot/rubygem-cairo
Cloning into '/var/lib/mock/f40-build-777900-129623/root/chroot_tmpdir/scmroot/rubygem-cairo'...
$ git reset --hard 21c399b468672488e41ab28fab3188a7bab17cec
HEAD is now at 21c399b Bump and rebuild