provider/cloudstack: use nm to get metadata address #1275
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Currently, Ignition tries to use networkd DHCP leases to get the metadata service address in CloudStack provider. As Fedora CoreOS switched to NetworkManager, CloudStack metadata cannot be found anymore. With this commit, Ignition uses several methods in order to find the address of the CloudStack Virtual Router (which serves the metadata service): 1. A DNS request on "data-server"; 2. The DHCP option "dhcp_server_identifier" as returned by NetworkManager (queried using DBus) 3. The current process (networkd DHCP leases) 4. The default gateway (as defined in /proc/net/route) Cf. coreos/fedora-coreos-tracker#716
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Currently, Ignition tries to use networkd DHCP leases to get the metadata service address in CloudStack provider.
As Fedora CoreOS switched to NetworkManager, CloudStack metadata cannot be found anymore (Afterburn has the same problem: coreos/afterburn#146)
With this PR, Ignition uses several methods in order to find the address of the CloudStack Virtual Router (which serves the
metadata service):
I kept method 3 only for compatibility reasons, but I can remove it (it does not work with Fedora CoreOS 34). The order of methods is inspired by cloud-init.
Cf. coreos/fedora-coreos-tracker#716