I'm experiencing the same problem, as storage I'm using a SSH server,
and my configuration is set up in ~/.ssh/config, so I've only set the
"Server" and "Folder" fields in the "Backup" app.
Tracing this back to the code (looking at the deja-dup_22.0-0ubuntu2
source) gives me common/BackendFile.vala:
[...]
else {
when = _("Backup will begin when a network connection becomes
available.");
return yield Network.get().can_reach (file.get_uri ());
}
[...]
Looking deeper into it, in common/Network.vala there's "public async
bool can_reach(string url)" that will use the GIO GNetworkMonitor
can_reach_async() method:
[...]
public async bool can_reach(string url)
{
var mon = NetworkMonitor.get_default();
try {
var socket = NetworkAddress.parse_uri(url, 0);
return yield mon.can_reach_async(socket);
[...]
The function is documented here:
http://developer.gnome.org/gio/2.32/GNetworkMonitor.html#g-network-
monitor-can-reach-async
The socket is determined by parse_uri:
http://valadoc.org/#!api=gio-2.0/GLib.NetworkAddress.parse_uri
I'm not sure if there's an easy solution to this problem, especially
since it's not enough to just parse the SSH config and check for the
"right" hostname, as one could use ProxyCommand to do further
indirections (I coincidentally do this, because I have to connect to
different IPs depending on whether or not I'm inside or outside the
private network where the backup machine is located).
Host mybackupserver
ProxyCommand some-script-to-open-a-ssh-connection
See the ssh_config(5) manpage for more information.
I guess the easiest way to fix this would be to special-case SSH URIs
and just use the "ssh" command to try to make a connection, and use that
for the can_reach method - this will also take care of ProxyCommand and
friends, and should be more to the point.
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https://bugs.launchpad.net/bugs/982316
Title:
Deja Dup is unable to detect network connection
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