[Lilypond-auto] [LilyIssues-auto] [testlilyissues:issues] #5450 relocate.cc: Introduce new command `set?'.

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Pushed to staging as
commit 8067320145662554d85e59e6b9e6df3770f9e4a3
Author: Werner Lemberg address@hidden
Date: Fri Dec 21 17:47:11 2018 +0100

Issue 5450: relocate.cc: Introduce new command `set?'

Contrary to `set', `set?' won't override environment variables that are
already set.

We need this for reproducable builds, in particular with gub: The standard
fontconfig setup includes font files like `~/.fonts' or `/usr/share', which
obviously must not be used.  Up to now, the `fontconfig.reloc' file in gub
uses the `set' relocation command, which doesn't allow gub to replace the
fontconfig configuration file with a temporary alternative while building
test files or documentation.  Future changes in gub will use `set?' instead.

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[issues:#5450] relocate.cc: Introduce new command `set?'.

Status: Started
Created: Fri Dec 21, 2018 04:55 PM UTC by Werner LEMBERG
Last Updated: Sun Dec 30, 2018 10:20 AM UTC
Owner: Werner LEMBERG

relocate.cc: Introduce new command set?.

Contrary to set, set? won't override environment variables that are
already set.

We need this for reproducable builds, in particular with gub: The standard
fontconfig setup includes font files like ~/.fonts or /usr/share, which
obviously must not be used. Up to now, the fontconfig.reloc file in gub
uses the set relocation command, which doesn't allow gub to replace the
fontconfig configuration file with a temporary alternative while building
test files or documentation. Future changes in gub will use set? instead.

http://codereview.appspot.com/345160043

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