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Add some safety checks when sourcing files in /etc/profile.d/, in particular: - source only *.sh files, not every file. This is the practice in use in both Fedora and Debian/Ubuntu (see https://help.ubuntu.com/community/EnvironmentVariables#A.2Fetc.2Fprofile.d.2F.2A.sh); - check the input is actually a file and is readable. This check is especially important if profile.d is empty, as "*.sh" will get expanded only if profile.d is not empty. Previously if profile.d was present but empty, "/etc/profile.d/*" was sourced causing errors on login and breaking stuff, for example X startup. (From OE-Core rev: 8961bc4b71723477a3b4a837a1d9c25c1b860b9e) Signed-off-by: Diego Rondini <diego.ml@zoho.com> Signed-off-by: Ross Burton <ross.burton@intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>