$ git clone -n https://src.fedoraproject.org/rpms/golang-github-prometheus-tsdb.git /var/lib/mock/f38-build-709651-92938/root/chroot_tmpdir/scmroot/golang-github-prometheus-tsdb
Cloning into '/var/lib/mock/f38-build-709651-92938/root/chroot_tmpdir/scmroot/golang-github-prometheus-tsdb'...
$ git reset --hard 606c4ebee3447467e88ab8f8c3794a6765e95dcb
HEAD is now at 606c4eb Rebuild to fix FTBFS