Re: dbLoadRecords and substitute

[Mark Rivers via Tech-talk <tech-talk at aps.anl.gov>]

Hi Giles,

I recently converted a Diamond-style database (for the Symetrie hexapod) to load at runtime and ran into that 'substitute' issue. The solution is to use dbLoadTemplate which supports substitutions.

The original version with the 'substitute' keyword is here:

https://github.com/epics-motor/motorSymetrie/blob/R1-0/SYMETRIE_EPICSApp/Db/SymetriePmac.template

The new version uses that file modified to remove the 'substitute'

https://github.com/epics-motor/motorSymetrie/blob/main/SYMETRIE_EPICSApp/Db/SymetriePmac.template

plus this .substitutions file 

https://github.com/epics-motor/motorSymetrie/blob/main/SYMETRIE_EPICSApp/Db/SymetriePmac.substitutions

Mark

On Jun 8, 2022, at 3:24 AM, Knap, Giles (DLSLtd,RAL,LSCI) via Tech-talk <tech-talk at aps.anl.gov> wrote:



Hello,

I'm looking at updating our IOC build workflow (using containers) and would like to adopt the APS approach of doing database macro substitution at runtime in the IOC startup script. e.g.

    dbLoadRecords("pmacStatus.template", "PORT=BRICK1, P=BL45P-MO-STEP-01")

However I have discovered that a number of our database templates use the 'substitute' keyword. This is not supported by dbLoadRecords. 

In our existing workflow we expand templates with make at IOC build time, this uses MSI which does support 'substitute'.

Can anyone suggest a workaround for this?

Is this mismatch between MSI and base intentional?

 

Thanks,

giles

 

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