coinbrew tries to fetch Data/sample even with --no-third-party --off-line -t none

[tosttost]

Use case:

• local copies of Cbc, Cgl, Clp, Osi and Coinutils
• build Cbc based on local copy and without internet access

This can happen e.g. due to unreliable (mobile) network or on a build server with restricted network settings (for security purpose).

In such a setting coinbrew will still try to fetch Data/sample which is not necessary to build Cbc, at least with "-t none"
Similar things happen for asl, glpk etc. but those can be disabled using --without-foobar

Reproduction

wget https://raw.githubusercontent.com/coin-or/coinbrew/master/coinbrew

git clone https://github.com/coin-or/Clp.git
git clone https://github.com/coin-or/Cbc.git
git clone https://github.com/coin-or/Cgl.git
git clone https://github.com/coin-or/CoinUtils.git
git clone https://github.com/coin-or/Osi.git

# now disconnect network

build Cbc@master --no-prompt --no-third-party -t none --off-line --enable-shared --without-lapack --without-asl --without-glpk --without-mumps --disable-zlib --disable-bzlib --disable-readline

# result in

# Cloning into 'Data/Sample'...
# fatal: unable to access 'https://github.com/coin-or-tools/Data-Sample/': Could not resolve host: github.com

obvious workarounds

• have a local copy of Data/Sample for reasons
• hack coinbrew script removing all "git fetch"

Is it possible to introduce a --without-sample option?