• Table of contents
• What to do when there is a new release
  • Reference Documentation
  • Preliminaries
  • Using a new release with your existing source code directory
  • Getting more information
• Other use cases
  • You have no checked out code
  • Updating your own package
  • Your experiment repository/feature branch is not ready yet for the latest LArSoft release
• If cetpkgsupport was updated

What to do when there is a new release¶

Conventions used in this document:
NEW_RELEASE_VERSION - new release version (e.g., v03_00_00)
OLD_RELEASE_VERSION - the version of whatever release is currently setup
TOP_PRODUCT - generally this is larsoft, lbnecode, etc.
QUALIFIERS - qualifiers associated with the TOP_PRODUCT
WORKING_DIRECTORY - directory where you ran the mrb newDev command

Reference Documentation¶

mrb - the multi-repository build tool
UPS - Unix Product Support

• mrb user guide
• mrb reference guide
• mrb trouble shooting
• UPS Documentation

Preliminaries¶

1. type "ups active" to see what is in your current environment
   • check for the version and qualifiers used by your TOP_PRODUCT here
2. type "unsetup_all" and reestablish your basic working environment
3. If at all possible, simply logout and start from a fresh login

Using a new release with your existing source code directory¶

When a new LArSoft release is available and you want to develop against the new LArSoft release

1. Start from a fresh login and establish your basic working environment.
2. To check the list of available larsoft releases:
   

   ups list -aK+ larsoft

3. Make a new local products area for this release:
   

   cd WORKING_DIRECTORY
   mrb newDev -p -v NEW_RELEASE_VERSION -q QUALIFIERS
     #this creates a new localProducts_XXXX directory using the new larsoft release and the existing srcs directory
   source localProducts_XXXX/setup  
     #make sure to use the new localProducts directory, you may wish to delete the old directory
   

4. Now deal with the code:
   • If you are working on the develop branch:
     

     cd srcs/<repository>
     git checkout develop
     git pull
     

   • If you are working on a feature branch:
     

     cd srcs/<repository>
     git checkout develop
     git pull
     git checkout feature/<my feature branch>
     git merge develop
     

   • Repeat for each repository in $MRB_SOURCE
   • mrb uv larsoft NEW_RELEASE_VERSION
5. Resolving conflicts
   • git is very good about telling you how to resolve a conflict, please read the onscreen instructions
   • in particular, if you get lost, git status usually explains what is left to do, and how to do that
6. Check the required code changes, if any; these are called "breaking changes" and they are documented in our Breaking Changes wiki page. You may need to write update scripts and/or apply changes manually.
7. Make a clean build:
   

   cd $MRB_BUILDDIR
   mrb z
   mrbsetenv
   mrb i -jN #rebuild
   

Getting more information¶

1. To see a list of lar packages in a given larsoft release:
   • setup larsoft -v RELEASE_VERSION -q QUALIFIERS
   • cat $LARSOFT_DIR/releaseDB/product_list
   • This feature has been available since larsoft v03_03_00
2. To see the complete set of dependencies:
   • ups depend larsoft -v RELEASE_VERSION -q QUALIFIERS

Other use cases¶

You have no checked out code¶

This is the simplest possible case. We suggest that you start from a fresh login.

1. setup TOP_PRODUCT NEW_RELEASE_VERSION -q QUALIFIERS
2. See Quick Links for experiment-specific instructions on getting started

Updating your own package¶

1. Change the dependencies (larsoft and any other package that is explicitly listed in ups/product_deps)
   

   mrb uv larsoft NEW_RELEASE_VERSION
   mrb uv product version
   

Your experiment repository/feature branch is not ready yet for the latest LArSoft release¶

This is the scenario:

• you have started developing on your experiment repository (e.g. sbndcode) using gitflow
• at the time you started, you were using the latest LArSoft version of the time, in develop (e.g., v07_07_00)
• new versions of LArSoft have been released since then (e.g. now develop is based on LArSoft tag v07_09_00)
• the repository you are using is not yet up to date with the latest of those versions (e.g. v07_08_00)
• now you want to update your branch to your repository develop (e.g. sbndcode now at v07_08_00)

Following the guide above may very well be all you need to do: you'll get to work with the latest LArSoft (v07_09_00) and with an sbndcode that is the latest available (develop based officially on LArSoft v07_08_00), tweaked to work with the latest LArSoft.
But if there are breaking changes of any type between LArSift v07_08_00 and v07_09_00, it might not work!
If the breaking changes pertain directly your code, you'd better bite it and fix them now following the release notes and the breaking changes instructions.
If instead the issues are not in your code, you may either fix the repository code (that is, the whole sbndcode) for your collaboration, and make the fix available to your release manager as a feature branch (not including your personal code changed); or let the collaboration take care of that.
If you opt for the latter, in the meanwhile you need to:

• you go back to the official tag of your experiment repository (v07_08_00 of sbndcode):
  • make sure you are in the branch you expect to be (either develop or your feature branch, the same where you started)
  • restore your last commit via git reset --hard COMMIT (the commit hash can be found in the log reading git log); in this way, you land on the older LArSoft dependency too (v07_07_00); at this point you are where you started from
  • merge your experiment develop branch via git rebase (only if you haven't published your branch yet) or git merge, landing to the experiment-supported LArSoft version (v07_08_00)
• check out, for all the LArSoft repositories in your working area, the LARSOFT_SUITE tag matching your experiment LArSoft dependency (git checkout LARSOFT_SUITE_v07_08_00)
• go again through the instructions in the main part of this document, setting up the working area for the new, albeit not the latest, release (now 07_08_00) etc., but leave the LArSoft repositories at the LARSOFT_SUITE_... tag you just checked out; noyr that mrb uv larsoft v07_08_00 should at this point have no effect

If cetpkgsupport was updated¶

Or what to do when you see errors like this:

mrbsetenv 
The working build directory is /scratch/garren/larsoft/v04_03_02/p/build_slf6.x86_64
The source code directory is /home/garren/scratch/larsoft/v04_03_02/srcs
----------- check this block for errors -----------------------
ERROR: Version conflict -- dependency tree requires versions conflicting with current setup of product : full descriptions cetpkgsupport v1_08_04 -f NULL -z /products vs cetpkgsupport v1_08_05 -f NULL -z /products
ERROR: Version conflict -- dependency tree requires versions conflicting with current setup of product cetpkgsupport: version v1_08_05 vs v1_08_04
ERROR: Version conflict -- dependency tree requires versions conflicting with current setup of product : full descriptions cetpkgsupport v1_08_04 -f NULL -z /products vs cetpkgsupport v1_08_05 -f NULL -z /products
ERROR: Version conflict -- dependency tree requires versions conflicting with current setup of product : full descriptions cetpkgsupport v1_08_04 -f NULL -z /products vs cetpkgsupport v1_08_05 -f NULL -z /products

The default release of cetpkgsupport changes from time to time.
The solution is simply to unsetup cetpkgsupport and rerun the command.

unsetup cetpkgsupport