podman network exists

Add podman network exists command with remote support.

Signed-off-by: Paul Holzinger <paul.holzinger@web.de>

docs/source/markdown/podman-network-exists.1.md

@@ -0,0 +1,44 @@
+% podman-network-exists(1)
+
+## NAME
+podman\-network\-exists - Check if the given network exists
+
+## SYNOPSIS
+**podman network exists** *network*
+
+## DESCRIPTION
+**podman network exists** checks if a network exists. The **Name** or **ID**
+of the network may be used as input.  Podman will return an exit code
+of `0` when the network is found.  A `1` will be returned otherwise. An exit code of
+`125` indicates there was an other issue.
+
+
+## OPTIONS
+
+#### **--help**, **-h**
+
+Print usage statement
+
+## EXAMPLE
+
+Check if a network called `net1` exists (the network does actually exist).
+```
+$ podman network exists net1
+$ echo $?
+0
+$
+```
+
+Check if an network called `webbackend` exists (the network does not actually exist).
+```
+$ podman network exists webbackend
+$ echo $?
+1
+$
+```
+
+## SEE ALSO
+podman(1), podman-network-create(1), podman-network-rm(1)
+
+## HISTORY
+January 2021, Originally compiled by Paul Holzinger <paul.holzinger@web.de>

docs/source/markdown/podman-network.1.md

@@ -16,6 +16,7 @@ The network command manages CNI networks for Podman.
 | connect    | [podman-network-connect(1)](podman-network-connect.1.md)       | Connect a container to a network                                    |
 | create     | [podman-network-create(1)](podman-network-create.1.md)         | Create a Podman CNI network                                         |
 | disconnect | [podman-network-disconnect(1)](podman-network-disconnect.1.md) | Disconnect a container from a network                               |
+| exists     | [podman-network-exists(1)](podman-network-exists.1.md)         | Check if the given network exists                                   |
 | inspect    | [podman-network-inspect(1)](podman-network-inspect.1.md)       | Displays the raw CNI network configuration for one or more networks |
 | ls         | [podman-network-ls(1)](podman-network-ls.1.md)                 | Display a summary of CNI networks                                   |
 | reload     | [podman-network-reload(1)](podman-network-reload.1.md)         | Reload network configuration for containers                         |

docs/source/network.rst

@@ -7,6 +7,8 @@ Network
 
 :doc:`disconnect <markdown/podman-network-disconnect.1>` network disconnect
 
+:doc:`exists <markdown/podman-network-exists.1>` network exists
+
 :doc:`inspect <markdown/podman-network-inspect.1>` network inspect
 
 :doc:`ls <markdown/podman-network-ls.1>` network list