Setting the flags means we won#t try to read the data from /etc/shadow when reading a user record, thus slightly making conversion quicker and reducing the chance of generating MAC faults, because we needlessly access a privileged resource. Previously, passing the flag didn't matter, when converting our JSON records to NSS since the flag only had an effect on whether to use NSS getspnam() and related calls or not. But given that we turn off NSS anyway as backend for this conversion (since we want to avoid NSS loops, where we turn NSS data to our JSON user records, and then to NSS forever and ever) it was unnecessary to pass it. This changed in one of the previous commits however, where we added support for reading user definitions from drop-in files, with separate drop-in files for the shadow data.
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