Need help starting with Git

[abonato]

Dear Git support,

I am very very new to Git (started this morning).
I went through the tutorial by G. Eulisse and the FAQ pages, but I have
some problems even checking out a single package.

I would like to check out this package
https://github.com/h2gglobe/h2gglobe/tree/master/VertexAnalysis

I tried to do that by typing:

~/work/PhysAnalysis/UPGRADE/CMSSW_6_1_2_SLHC6_patch1/src -$>git cms-addpkg h2gglobe/VertexAnalysis
No release tags specified, using default CMSSW_6_1_2_SLHC6_patch1.
You are on branch CMSSW_6_1_X_SLHC
Checking out h2gglobe/VertexAnalysis in tag CMSSW_6_1_2_SLHC6_patch1.
Cloning into '/afs/cern.ch/work/b/bonato/PhysAnalysis/UPGRADE/CMSSW_6_1_2_SLHC6_patch1/src'...
remote: Counting objects: 56, done.
remote: Compressing objects: 100% (37/37), done.
remote: Total 42 (delta 27), reused 18 (delta 5)
Unpacking objects: 100% (42/42), done.
error: Sparse checkout leaves no entry on working directory
fatal: Could not reset index file to revision 'CMSSW_6_1_2_SLHC6_patch1'.

What does this error mean ? How can I fix it ?

Many thanks,
Alessio

[Dr15Jones]

Hi Alessio,
I'm afraid you can't use 'git cms-addpkg' for this particular case. 'git cms-addpkg' can only be used to either get packages from the official cmssw repository or from a repository which was forked from the official cmssw repository. That isn't the case for you. I would suggest you look at
#178

and try to apply the solution suggested there.

Chris

Christopher Jones
Fermi National Accelerator Laboratory
cdj@fnal.gov

[davidlt]

One of many quick ways:

export SCRAM_ARCH=slc5_amd64_gcc472
scram p CMSSW_6_1_2_SLHC6_patch1
cd CMSSW_6_1_2_SLHC6_patch1
eval $(scram r -sh)
cd src
git cms-init
git remote add h2gglobe https://github.com/h2gglobe/h2gglobe.git
git config core.sparsecheckout true
echo VertexAnalysis >> .git/info/sparse-checkout
git pull h2gglobe master
mkdir SomeSubsystem
mv VertexAnalysis SomeSubsystem
scram b -v -k -j 12 >&! b.log

Worked for me. Compiled fine, just one warning. Only issue I see is that pulling/fetching from h2gglobe repository is extremely long for some unknown reason.

[ktf]

Ciao Alessio. Please have a look at:

http://cms-sw.github.io/cmssw/tutorial-merge-usercode-repository-in-cmssw.html

to see if it makes sense for you. Please close this thread if it does.