Currently the makefile always recreates the ganeti symlink. Make it so
that it does only when it doesn't exist or it's not a symlink.

Reviewed-by: imsnah

Commit 1881 changed a rpc call but didn't fix all its users. This should
fix it (but I can't test as HTTP is broken).

Reviewed-by: imsnah

In order to replace usage of the shell just for 'cd %s; ...' we need to
be able to specify the working directory for childs.

The patch also changes the default working directory (when not
specified) to "/", as opposed to the current dir; since the daemos run
with cwd=/ anyway, this should not change things.

Reviewed-by: imsnah

The same code will be used by the HTTP client.

Reviewed-by: iustinp

While working on the HTTP client class, I wanted to use Mainloop
before deciding to use threads instead.

- Add docstrings
- Rename "quit" to "running", move it to a local variable
- Support adding and removing I/O listeners while running
  (e.g. to add/remove listeners from OnIO(…) calls)
- Allow user of the class to disable signal handlers
- Flag to exit once all listeners are gone

Reviewed-by: iustinp

This is an expected error message and will be used in two places.

Reviewed-by: iustinp

Reviewed-by: imsnah

It is based on the WorkerPool class which is already used for the job
queue and master daemon. Each request must be encapsulated in an
instance of HttpClientRequest, which will then be passed to
HttpClientManager for processing. Upon completion, the request object
contains the response or error message.

While not yet enabled, the HTTP client implementation has been designed
with HTTP/1.1 and keep-alive in mind. For now it only uses HTTP/1.0,
though.

HttpClientManager will likely need more changes when integrating with
the RPC layer. SSL will also be integrated in a second step.

Reviewed-by: iustinp, ultrotter

Reviewed-by: iustinp

The _WaitForSync call changed in r1794 but the GrowDisk call wasn't updated
then. This makes GrowDisk work in trunk.

Reviewed-by: iustinp

As a preparation for the new HTTP client class, add more constants
to ganeti.http.

Reviewed-by: iustinp

Reviewed-by: imsnah

Reviewed-by: imsnah

The newer_than variable can be either None or an int, and we normalize
it to an integer previously and save it in the 'serial' variable, which
should be used instead.

Reviewed-by: imsnah

Reviewed-by: imsnah

Reviewed-by: imsnah

Reviewed-by: imsnah

Reviewed-by: imsnah

Currently gnt-backup list exits with the same error code even if can't
contact som nodes for backup information.

The patch changes it to return 1 instead in this case.

Reviewed-by: imsnah

The patch also adds a 'return 0' to a function that was missing it.

Reviewed-by: imsnah

Reviewed-by: imsnah

Reviewed-by: imsnah

This patch converts all of backend.py to epydoc formatting.

Reviewed-by: imsnah

The return from this error path is a dict, but the actual return value
(on the non-error handling) is a list of dicts. Change accordingly.

Reviewed-by: imsnah

Found while reviewing documentation.

Reviewed-by: ultrotter

Reviewed-by: iustinp

In the end we ended up taking a slightly different approach for
import/export than the one discussed in the design doc, after
trying/talking about a few more alternatives. Document this in the
document.

Reviewed-by: iustinp

This fixes a few doc issues and converts a few docstrings to epydoc.

Reviewed-by: imsnah

Currently we launch processes via the shell in a few places only to
redirect standard output and error to a log file ("&> $file"). It is
better to do such redirection from within RunCmd itself.

This patch splits RunCmd in two parts, the setup and the execution part,
the latter being implemented in two different functions depending on
whether we write to a file or not.

We also update the unittests with this new case.

Reviewed-by: imsnah

Reviewed-by: killerfoxi

At the same time, simplify the interface a bit by not using a tuple.

Reviewed-by: killerfoxi, ultrotter

Document the new options for gnt-cluster modify and the new queue
command.

Reviewed-by: imsnah

This patch updates the gnt-cluster man page to reflect the current
changes to gnt-cluster.

Reviewed-by: imsnah

Reviewed-by: imsnah

Currently we don't catch the JobSubmittedException (although the code to
format it nicely is there). The patch adds the exception name to the
catch list and makes --submit work.

Reviewed-by: imsnah

We want to export the disk index as some OSes will only want to export
the first disk (or the second one, etc.), even if we have multiple
disks.

The patch also updates the backend.ExportSnapshot docstring.

Reviewed-by: ultrotter

Reviewed-by: imsnah

Reviewed-by: imsnah

It turned out that clients not sending a full request will stop
us from responding to further requests. This patch leverages the
situation a bit by always forking before handling the request,
but we still have DoS situations.

Reviewed-by: ultrotter

We don't have timers yet, hence waking up is not needed at all.

Reviewed-by: ultrotter