Disable sage-make_relative when upgrading

[jdemeyer]

This is essentially #13407 for upgrades: sage-make_relative is evil because it leads to race conditions.

This probably caused an upgrade problem on rosemary: the script local/bin/ipython wasn't installed:

running install_scripts
copying build/scripts-2.7/iplogger -> /home/buildbot/build/sage/rosemary-1/rosemary_upgrade_4.5.2/build/sage-5.7.beta1/local/bin

which normally looks like

running install_scripts
copying build/scripts-2.7/ipengine -> /release/buildbot/sage/sage-1/sage_upgrade_4.8/build/sage-5.7.beta1/local/bin
copying build/scripts-2.7/ipcontroller -> /release/buildbot/sage/sage-1/sage_upgrade_4.8/build/sage-5.7.beta1/local/bin
copying build/scripts-2.7/ipcluster -> /release/buildbot/sage/sage-1/sage_upgrade_4.8/build/sage-5.7.beta1/local/bin
copying build/scripts-2.7/iplogger -> /release/buildbot/sage/sage-1/sage_upgrade_4.8/build/sage-5.7.beta1/local/bin
copying build/scripts-2.7/ipython -> /release/buildbot/sage/sage-1/sage_upgrade_4.8/build/sage-5.7.beta1/local/bin
copying build/scripts-2.7/pycolor -> /release/buildbot/sage/sage-1/sage_upgrade_4.8/build/sage-5.7.beta1/local/bin
copying build/scripts-2.7/irunner -> /release/buildbot/sage/sage-1/sage_upgrade_4.8/build/sage-5.7.beta1/local/bin
copying build/scripts-2.7/iptest -> /release/buildbot/sage/sage-1/sage_upgrade_4.8/build/sage-5.7.beta1/local/bin

Distutils by default doesn't overwrite newer files, and sage-make_relative can make a file look newer, causing distutils to not copy a file.

Component: build

Author: Jeroen Demeyer

Reviewer: Volker Braun

Merged: sage-5.7.beta2

Issue created by migration from https://trac.sagemath.org/ticket/14027

[jdemeyer]

Author: Jeroen Demeyer

[jdemeyer]

Attachment: 14027_dont_make_relative.patch.gz

[vbraun]

Reviewer: Volker Braun

[vbraun]

comment:4

Sounds good to me.

[jdemeyer]

Merged: sage-5.7.beta2