Allow to set SINGULARITY_HOME before

build_container.sh sets SINGULARITY_HOME in a specific way which we may
need to adjust for the EESSI bot. To do so we check if SINGULARITY_HOME
is already set before the script is run and only set if it is not yet
set.

Author: truib

build_container.sh

@@ -50,7 +50,10 @@ else
     export SINGULARITY_BIND="$SINGULARITY_BIND,$BIND_PATHS"
 fi
 
-export SINGULARITY_HOME="$EESSI_TMPDIR/home:/home/$USER"
+# allow that SINGULARITY_HOME is defined before script is run
+if [ -z $SINGULARITY_HOME ]; then
+    export SINGULARITY_HOME="$EESSI_TMPDIR/home:/home/$USER"
+fi
 
 # set environment variables for fuse mounts in Singularity container
 export EESSI_PILOT_READONLY="container:cvmfs2 pilot.eessi-hpc.org /cvmfs_ro/pilot.eessi-hpc.org"