Description of problem: NetworkManager fails to update /etc/resolv.conf in a stateless environment. In a stateless environment, the root filesystem is mounted read-only; however, some files which need to be writable (such as /etc/resolv.conf) are bind mounted from a writable filesystem. In this scheme it is impossible to perform a traditional atomic update via the create temporary file, rename temporary to target approach. (creation of the temporary file would fail as would the rename operation). We really need NetworkManager to do something sensible here since NetworkManager is the only real solution for managing NICs in a stateless environment. This patch allows NetworkManager to detect EROFS and use an alternate scheme to update /etc/resolv.conf (non-atomic overwrite, unfortunately). This patch also fixes a minor nit -- we should close the output file after calling g_set_error in the event of an error -- we want g_set_error to reflect errno from the failing syscall, not from a failing fclose. Version-Release number of selected component (if applicable): How reproducible: Steps to Reproduce: 1. 2. 3. Actual results: Expected results: Additional info:
Created attachment 140581 [details] patch
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