[Halld-offline] [EXTERNAL] fun fact about installing updated cern packages

[Mark Ito]

Presto indeed...good to know...

On 12/29/21 9:25 PM, Richard Jones wrote:
> Hello Mark and all,
>
> I just discovered a fun fact regarding an easy path to always having 
> the right version of common packages installed on the local machine: 
> just install cvmfs and access the desired build from there, which is 
> built and maintained there by the developers on behalf of the LHC 
> experiments:multiple build options (debug, optimized builds), multiple 
> compiler versions. For example, just to install the latest G4 on my 
> local cluster, I used to have to build it several times (mutli-thread, 
> single-thread, debug, opt, ...) but now I just change a couple of 
> lines in my setup.sh to a new target on /cvmfs and presto. There are 
> also builds there for the Mac. Have a look at:
>
>   * /cvmfs/geant4.cern.ch/geant4/
>     <https://urldefense.proofpoint.com/v2/url?u=http-3A__geant4.cern.ch_geant4_&d=DwMFaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=i3BxiInvFIdWuzU_zoMBCQ&m=WaZt3Qi-TDUuubobyWJ9gOuVrHgrgORic-ap18Txu-bGvLO2jdIjtWB_8DYF0abI&s=DPvrUKbJbAV93qGN6Z72UivTCKVBDJLXUJ6cBZBp30A&e=>
>   * /cvmfs/sft.cern.ch/lcg/app/releases/ROOT/
>     <https://urldefense.proofpoint.com/v2/url?u=http-3A__sft.cern.ch_lcg_app_releases_ROOT_&d=DwMFaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=i3BxiInvFIdWuzU_zoMBCQ&m=WaZt3Qi-TDUuubobyWJ9gOuVrHgrgORic-ap18Txu-bGvLO2jdIjtWB_8DYF0abI&s=s6oIHRNgLmXLUzGegt-h7Xvme7jiDinWuAd-3bj70og&e=>
>
> -Richard Jones
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