non-existing symlinks halt generate process

Bug #1788360 reported by Teemu Karimerto on 2018-08-22
This bug affects 2 people
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Bug Description

In short, "netplan generate" halts/crashes on first non-existing symlink in /etc/netplan/.

What I'm trying to do is leverage netplan's ability to override configurations with "later" files. The idea was that I provide sensible defaults (ie. use dhcp) for some interfaces that can be overridden with location-specific custom configs (like a static IP) if necessary. These custom configs come via symlinks which point to either existing or non-existing files, but if the targets of the symlinks do not exist, netplan fails completely (nothing is configured).

I think it should silently (or with a warning) just ignore files which either do not exist or cannot be opened for whatever reason. This seems to be the standard behavior in most other software. Currently I am forced to create empty config files where the symlinks point to.

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