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Merged
merged 3 commits into from
Apr 27, 2018
Merged

Add firewall section to the networking page #8032

merged 3 commits into from
Apr 27, 2018

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larskarlitski
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@larskarlitski larskarlitski commented Nov 5, 2017

First look at a what a firewall module might look like.

It operates on firewalld's default zone and there are no plans to expose zones, as they don't seem to be used very often on servers.

The delete buttons don't work yet, but the UI updates itself when adding and removing services from the default zone with one of:

sudo firewallctl zone '' remove service ssh
sudo firewallctl zone '' add service ssh

firewall

This will implement the minimal version of the design and iterate in later pull requests.

  • show the firewall section on the default page when firewalld is installed
  • show the list of services that are currently active
  • allow to remove a service
  • allow to add one of firewalld's predefined services
  • tests
  • add doc/guide page
  • feature video for release notes: https://youtu.be/yR5riNcIDbc

@garrett
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garrett commented Dec 5, 2017

@q2dg
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q2dg commented Dec 5, 2017

Ei, there's any still-alpha firewall module available to download for trying it? Thanks!

@larskarlitski
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First update towards @garrett's design: move the page over to the network page.

Small bug (in addition to all the stuff missing): cockpit.location.go() in the breadcrumb doesn't do what it should.

@larskarlitski
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Quick update: make the breadcrumb work correctly, hook up the switch to starting/stopping firewalld.service, and hide the whole section if firewalld is not installed.

@larskarlitski larskarlitski changed the title WIP: Add firewall page WIP: Add firewall section to the networking page Feb 7, 2018
@larskarlitski
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Update with a refactor, because my initial approach of talking to firewalld turned out to make too many D-Bus calls and cause too many re-renders. Removing services is now supported. Also lots of tiny fixes to get it close to the design.

return (
<div className="container-fluid page-ct">
<ol className="breadcrumb">
<li><a onClick={go_up}>{_("Network")}</a></li>
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Just a flyby comment that this is called "Networking" in the menu and on the breadcrumb on the other sub-pages.

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Indeed. Thanks for the catch! It'll be fixed with the next push.

@larskarlitski
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Update with minor fixes pointed out by @martinpitt and @andreasn. Also add a first version of the "Add Services" dialog. It's still missing the search box and some layout fixes to qualify for this PR, so leaving WIP.

Depends on #8794 now.

@larskarlitski
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Fix a couple of things we discussed on IRC:

  • "N Active Rules" on the main networking page is now clickable (and blue on hover)
  • services on the firewall page and in the "Add Services" dialog are now (actually) sorted alphabetically
  • clicking anywhere on a row in the "Add Services" dialog toggles its checkbox
  • fix alignment and spacing issues

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Another update, which I think brings it to a state for a first round of review (removed WIP):

  • add search box in the Add Services Dialog
  • skip the tests on some images that don't have firewalld
  • fix networking test that used ambiguous selector now, because of the new elements

@larskarlitski larskarlitski changed the title WIP: Add firewall section to the networking page Add firewall section to the networking page Mar 13, 2018
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Thanks for working on this! The code layout and structure is very clean and easy to follow (kudos! it's a nice read), and the scope is just right for the initial landing. I have lots of nitpicks, but the vast majority should be trivial to fix.

@@ -46,6 +46,7 @@ Vagrant.configure(2) do |config|
atomic \
docker \
etcd \
firewalld \

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cockpit.event_target(firewall);

var firewalld_service = service.proxy('firewalld');
var firewalld_dbus = cockpit.dbus('org.fedoraproject.FirewallD1', { superuser: 'try' });
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These two should be const.

superuser "try" might work because firewalld has polkit rules? But the default policy (rightfully) does not allow users to change the firewall rules without authenticating as admin. Does reading the state work as user? Then the page would be useful to non-admins, provided that permission errors are handled sanely (e. g. by not showing the "modify" buttons for non-admins).

var firewalld_service = service.proxy('firewalld');
var firewalld_dbus = cockpit.dbus('org.fedoraproject.FirewallD1', { superuser: 'try' });

firewalld_service.addEventListener('changed', function () {
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Nitpick: you mix arrow functions and classic functions for this kind of "inline" event handlers. Arrow functions are a bit more ES6-y I think. (totally not a merge blocker, of course)

var firewalld_dbus = cockpit.dbus('org.fedoraproject.FirewallD1', { superuser: 'try' });

firewalld_service.addEventListener('changed', function () {
var installed = !!firewalld_service.exists;
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Isn't exists already a boolean property?

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It's set to null before the first update. I've been bitten by JavaScript's weird type coercion too many times, so I've left the !!.

.then(reply => {
var [ , name, description, ports ] = reply[0];

var info = {
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Please use let in this kind of arrow functions for proper scoping.

raise Exception("timed out waiting for {} to become {}".format(unit, state))


class TestNetworking(MachineCase):
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Please rename to TestFirewall, to avoid confusion.

These tests need to be blacklisted on at least rhel-7-4 (where networking is in base, and thus don't get this feature). There are also some images (like the Debians) which don't have firewalld, I suggest the test skips them for now.

wait_unit_state(m, "firewalld", "active")

active_rules = m.execute("firewallctl zone '' list services").split()
b.wait_in_text("#networking-firewall-summary", "{} Active Rules".format(len(active_rules)))
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Corner case: Use "Rule" here instead of "Rules", for the corner case that there is really just one. However, our images should have at least ssh and cockpit, so I guess it's fine.

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Wow, awesome catch!

b.wait_present("#networking-firewall-switch label.active:not(.disabled)")
b.wait_in_text("#networking-firewall-switch label.active", "Off")
wait_unit_state(m, "firewalld", "inactive")
b.wait_in_text("#networking-firewall-summary", "0 Active Rules")
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This behaviour feels a bit odd. If the firewall is disabled, then "0 active rules" feels like "enabled, but unconfigured". Shouldn't this be hidden completely, as the firewall state is already shown as "off"?

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This is as designed. I agree that we might want something better here. I'll ask @garrett.

b.enter_page("/network/firewall")

b.click(".breadcrumb li:first a")
b.enter_page("/network")
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I suggest stopping and removing firewalld.service from disk (don't forget systemctl daemon-reload), and verify the expected behaviour of "not installed".


self.login_and_go("/network/firewall")

# Add a service that's probably not enabled by default anywhere
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... so do the equivalent wait_not_present()?

@larskarlitski
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Thanks very much for the detailed review. Lots of good stuff!

To not spam you too much, I haven't commented "Fixed" on the suggestions that I accepted exactly as you wrote them.

The one thing I haven't fixed is showing the UI read-only when we're not superuser, as that's a bit more involved. How do we usually find this out? Ask polkit directly?

@martinpitt
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@larskarlitski : We spoke about this in IRC, but for the record: You can query https://www.freedesktop.org/software/polkit/docs/latest/eggdbus-interface-org.freedesktop.PolicyKit1.Authority.html#eggdbus-method-org.freedesktop.PolicyKit1.Authority.CheckAuthorization to see if your process is allowed to authorize. Of course you still need to know whether the user ticked the "use my password for admin tasks", I hope we store that somewhere?

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larskarlitski commented Mar 29, 2018

Added a commit that disables buttons when the current login doesn't want their password remembered. This removes superuser: try (because it always works with that).

I ended up calling pkcheck directly, because there's no way to get at the bridge's PID from cockpit, and the PolicyKit D-Bus API expects that.

This is a bit weird, because I couldn't find a way to get a signal when the "Lock" button in the menubar is clicked, in which case we'd have to rerender the UI.

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This works well enough, thanks for that! The "On/Off" button on the /network/firewall page still needs the same "disable" treatment as "Add services..". I can't actually operate it in unprivileged mode - it stays at "off" even though the firewall is really on.

I don't see the firewall section on /network at all in unprivileged mode. I think this is right - the /firewall page is next to useless then anyway.

@@ -120,6 +121,12 @@ firewalld_dbus.subscribe({
firewall.dispatchEvent('changed');
});

cockpit.spawn(['sh', '-c', 'pkcheck --action-id org.fedoraproject.FirewallD1.all --process $$ -u 2>&1'])
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A bit ugly indeed, but I can't think of a better way. If we encounter this more often in the future, we might instead query/store the bridge pid as a global variable somewhere.

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I agree. If we start doing this in more places, we probably also want (internal) library functions for that.

var addServiceAction;
var classes = "btn btn-primary pull-right";
if (this.state.firewall.readonly)
addServiceAction = <button className={classes} disabled title={_("You are not authorized to modify the firewall.")}>{_("Add Services…")}</button>;
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This is using the standard browser tooltips (white on black) which are "wrong". I suggest using update_privileged() for that, or if that somehow is impractical, use .tooltip('fixTitle') (but that requires jQuery) or our Tooltip react component.

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update_privileged() also depends on jQuery, which I don't want to pull into firewall.jsx. I've used the React component, which unfortunately needed some minor tweaking. I've added the two commits on here as well.

@@ -65,6 +65,8 @@ function ServiceRow(props) {
{ udp.map(p => p.port).join(', ') }
</div>,
<button className="btn btn-danger pficon pficon-delete"
title={props.readonly ? _("You are not authorized to modify the firewall.") : null}
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Also the wrong tooltip. Here it seems mostly irrelevant as an unprivileged user cannot even see the current firewall rules. But there is the theoretical possibility that an admin changes the polkit rules to allow that to users, but not modification.

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I can see the firewall rules as an unprivileged user on fedora. Fixed as above.

@larskarlitski
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This works well enough, thanks for that! The "On/Off" button on the /network/firewall page still needs the same "disable" treatment as "Add services..". I can't actually operate it in unprivileged mode - it stays at "off" even though the firewall is really on.

As discussed on IRC: I can operate the button even in unprivileged mode. I guess there's something wrong with superuser: "try", but that's unrelated to this pull request.

I don't see the firewall section on /network at all in unprivileged mode. I think this is right - the /firewall page is next to useless then anyway.

I do, but I've left it the way it is for the reason above.

I've added two more commits to fix our Tooltip component, but left the extra commit for the unprivileged stuff so that it's easier for you to review. I'll squash it into the main commit after the review.

@martinpitt
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I can operate the button even in unprivileged mode

Actually now I see that too, not sure what was different. However, does that actually work for you? What happens here is that the firewall is shown as "off", then I can click it to "on" (but does not actually start firewalld.service), and then it moves to the disabled state. From then on it stays disabled.

Another issue is that in privileged mode the On/Off switch is a bit confusing. It takes about two seconds after clicking to actually take effect, but during that time the button stays enabled and does not change state. This feels like "I mis-clicked", and when clicking again it interferes with the first click.

Compare this with the "Automatic Updates" on/off switch on software updates. This immediately switches state, and gets disabled until the action takes place. This was the result of some involved discussions with our designers, so I think we should have the same behaviour here.

Both are minor issues, so I would be happy if these become follow-ups if you prefer. The rest looks good, great job with figuring out the tooltip issues! I confirm that the changes work well, also on the kdump/playground pages.

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The firewall tests fail on several OSes.

@larskarlitski
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I've changed the switch on the firewall page to behave in the same way as the other one: it is disabled while the state change is pending.

The tests had two issues: one was a logic mixup (!= vs ==) and the other one that we need to wait for the Add Services button to become enabled before we can click it. The latter happened only after I added the read-only mode, which is the default and the button can be disabled for a few ms.

Also folded the read-only mode commit into the main one.

Sorry for the delay.

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Still some test failures.

@larskarlitski
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Finally got around to look at the failing tests. Sorry for the delay.

Don't use systemctl is-active, because of this bug. Use firewall-cmd instead of firewallctl, because the latter is not available on all systems we support (rhel-7). Also, skip the images which don't have firewalld installed.

I tried to make this work on fedora-atomic and rhel-atomic. They do have firewalld installed, but it's not enabled by default. The tests fail as soon as its enabled, because there's no hole for cockpit in their firewall. I've tried adding that but ran into more issues and decided this is ok for a follow-up.

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Hmm, this collided with #9027. Maybe this was too aggressive and we should revert the "indent" stuff..

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@larskarlitski : Force-pushed with running npm run eslint:fix to get the indentation right, and with capitalizing the commit messages.

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Ah, I rebased and fixed a conflict, it didn’t build again, because I had to run. Thanks!

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Tests look good now, nice! There are a few outstanding issues/questions from the previous review round, and this still needs a feature page and a video or some screen shots. Getting close!

rowId={props.service.id}
columns={columns}
tabRenderers={tabs}/>;
}
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It's fine for me, just wanted to point it out.

enabled: firewall.enabled,
services: firewall.services,
enabledServices: firewall.enabledServices
};
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I'd still like to discuss the above.

firewall.dispatchEvent('changed');
});

cockpit.spawn(['sh', '-c', 'pkcheck --action-id org.fedoraproject.FirewallD1.all --process $$ -u 2>&1'])

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Maybe replace -u with --allow-user-interaction -- short options are nice for users to type; but not really in code imo.

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Yeah that's a good point. Changed. Thanks!

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Added a feature page.

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eslint spotted a bug and has another complaint:

/build/cockpit/pkg/networkmanager/firewall.jsx
  179:36  error  Unknown property 'for' found, use 'htmlFor' instead  react/no-unknown-property
  253:64  error  Arrow function should not return assignment          no-return-assign

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Great work! I found a few small bugs and nitpicks, but this is really close now :)

services in the default zone.</para>

<para>To perform similar tasks from the command line, use
<ulink url="http://www.firewalld.org/documentation/man-pages/firewall-cmd.html">firewalld-cmd</ulink>:
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Can we please use https:// URLs? (Same above) I checked that they work.

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I had tried https://firewalld.org and that didn't work. It does with the www though. Good catch!

<programlisting>
$ <command>sudo firewall-cmd --list-services</command>
dhcpv6-client samba-client mdns ssh cockpit
</programlisting>
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Maybe another command to enable a service? That's a very common use case.

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Yeah good point.

*/
.then(function () {
return Array.prototype.slice.call(arguments);
});
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It's fine like that if you prefer; but you use arrow functions everywhere else, and they are more concise.

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There's a comment above these lines which explains why this is: cockpit.all returns results as individual arguments, so we need access to the arguments object, which doesn't exist in arrow functions.

Also, eslint gets the indentation wrong here. Do you know why?

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I don't, I'm afraid. You mean the alignment of the });, right? If some rule gets it wrong, feel free to disable it for the time being.


if (!firewall.enabled) {
firewall.services = {};
firewall.enabledServices = new Set();
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I wonder if these two lines of initialization shouldn't happen always. Say you get an owner event while the firewall is enabled, then the code below would only add to the current state, leaving potentially obsolete old state. As long as you don't dispatch a changed in between initialization and finishing the getServices() call below, there shouldn't be any actual re-rendering (i. e. screen flicker)?

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Indeed! Very nice catch, thanks.


firewall.enable = () => {
return cockpit.all(firewalld_service.enable(), firewalld_service.start());
};
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Arrow function with a single-line return can be simplified.

if (!this.state.firewall.installed) {
return (
<EmptyState title={_("Firewall is not available")} icon="fa fa-exclamation-circle">
<p>{cockpit.format(_("Please install the {0} package"), "firewalld")}</p>
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Hah, another nice candidate for on-demand installation :-)

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Indeed!

$('#networking-firewall-switch').onoff('value', firewall.enabled);

var n = firewall.enabledServices.size;
var summary = cockpit.ngettext('1 Active Rule', n + ' Active Rules', n);
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These strings cannot be translated. You need to use ngettext("$0 Active Rule", "$0 Active Rules", n).

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Oooooooops

def wait_unit_state(machine, unit, state):

def active_state(unit):
# don't use `systemctl is-active` here because of https://bugzilla.redhat.com/show_bug.cgi?id=1073481
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Can you please prepend this with HACK:, so that our hacks stay easily greppable?

def active_state(unit):
# don't use `systemctl is-active` here because of https://bugzilla.redhat.com/show_bug.cgi?id=1073481
# outputs "ActiveState=state\n"
line = machine.execute("systemctl show -p ActiveState {}".format(unit))
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Note: --value does not yet exist in current CentOS 7.4. Once that moves to 7.5, we can use it.

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Ah I didn't know about that. Thank you!

wait(lambda: active_state(unit) == state, delay=0.2)


@skipImage("firewalld not installed", "rhel-7-5", "centos-7", "fedora-atomic", "rhel-atomic", "debian-stable", "debian-testing", "ubuntu-stable", "ubuntu-1604")
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Follow-up: We should definitively install it on rhel-7-5 and centos-7 at least. So on rhel-8 it's already present apparently, good!

Pass through the `className` property to the outermost div of the
Tooltip component. This avoids wrapping the tooltip when using it with
positioning classes (such as `pull-right`).
Use onmouseleave instead of onmouseout events, because the latter
has different bubbling behavior on Chrome, which doesn't work when the
containing element is floating.

Also, use onmouseenter instead of onmouseover events to avoid
unnecessary re-renders and make capitalization more consistent.
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Thanks very much for the review! The ones I've left uncommented are fixed as well. Didn't want to spam you too much ;)

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Very nice, great work!

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Oops, the test still fails: The screenshot shows that it's literally displayed $0 Active Rules.

$('#networking-firewall-switch').onoff('value', firewall.enabled);

var n = firewall.enabledServices.size;
var summary = cockpit.ngettext('$0 Active Rule', '$0 Active Rules', n);
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Sorry, this needs to be wrapped in cockpit.format(cockpit.ngettext(...), n) to actually resolve the $0.

Introduce a panel on the networking page, which allows toggling the
firewall and shows some quick information. Also add a firewall page that
shows currently enabled services (as defined by firewalld) and allows
adding and removing these services.

Custom ports are not yet supported.

Fixes #1094
Closes #8032
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Added cockpit.format() (and a hack, because that cannot handle 0 as an argument) and reordered the location with the weird indent to make that more readable.

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Nice, thanks!

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Corresponding semaphore run: https://semaphoreci.com/cockpit/cockpit/branches/pull-request-8032/builds/20 (wasn't added as test here for some reason)

@martinpitt martinpitt merged commit 08ed421 into cockpit-project:master Apr 27, 2018
@larskarlitski larskarlitski deleted the firewall branch April 30, 2018 09:53
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6 participants