Tar failure on GPFS

[yslai]

When compiling with GPFS as the underlying file system, the build.sh for ROOT fails with:

DEBUG:AliPhysics:ROOT:ali-master: tar: ./sles12_x86-64/ROOT/v5-34-30-alice10-1/lib: file changed as we read it

Compiling on a distributed file system cannot guarantee that the directory does not changes during tar, which build.sh demands by running tar with set -e. It seems this tar idiosyncrasy is not handled (in fact, tar will return 1 even with --warning=no-file-changed), despite using --ignore-failed-read.

Also, the subsequent aliBuild error messages ask the user to search for errors in the log, which does not contain any hint for build.sh being stopped at tar.