RFC: Mocking the system to test the TUI in developer's environment

doc/mockrun.md

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+The `mockrun-installer` script allows to quickly check some of the TUI
+changes locally, providing a big speedup of dev cycle as compared to
+remastering an ISO image and testboot it.
+
+The execution environment has to be as close a possible as the one
+used as dom0 on the install ISO, which in turn is very close to a
+XCP-ng dom0 OS.
+
+The xcp-ng-build-env docker container is the best choice for a runtime
+environment, as it has access to all required dependencies, which you
+will still have to install.
+
+For XCP-ng 8.3:
+```
+user $ xcp-ng-dev container shell 8.3 -d .
+builder $ sudo yum install -y xcp-python-libs newt-python python2-simplejson python-six pyOpenSSL
+builder $ cd /external/host-installer/
+builder $ ./mockrun-installer
+```
+
+## details of operation
+
+This script fakes many calls to lower-level python libraries,
+currently in a hardcoded fashion, so it possibly has to be hand-edited
+to check other use cases.
+
+It will attempt to run system commands, NEVER try to run it as root on
+a real system.
+
+No specific way to interrupt the TUI is provided, but causing it to
+"abort and reboot" will cause it to exit.  As a last resort going to
+the final dialog for confirmation of install (F12 is your friend) and
+proceeeding will attempt execution of unstubbed commands
+(e.g. `uuidgen`) and abort.  Or you can kill the process externally
+and `reset` your tty afterwards.
+
+`installer.log` is generated in current directory.

mockrun-data/etc/xensource/xapi-ssl.pem

@@ -0,0 +1,46 @@
+-----BEGIN RSA PRIVATE KEY-----
+MIIEpAIBAAKCAQEA3rNjU4jJPu9hdovSXAOAIEwQvXmNTdWGLOYVPzy/u5ieWBLT
+zL6zndElFdjmyG/srxRP8Q7uicEVCpX2Tj319dDUW877HU1hh84z1CaQpIPCIJcd
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+lXr2njPMb906DstxNQjNPkM1LD+xqeXnrcGtUBbOP3VP3e3ISYVrt/jnvRu/LctV
+Gps57LmudmuDv/XV45yMjTECgYBFec5tCFzlQupiYrZgZUb00CsUd+Jdbj1N+bpH
++JV8YFeiA/dRFmjf37va8b4etIvUhkM5xq6B3c9rzHvhxWX17Gg+7s49GDZpTlVE
+rJw/6skNuT9TX6IlRfW/n6FzI+dC9Ed69Kag8nd+7U3sBm9Rs9fT0fjP3XFypMui
+5/yaFwKBgQC/pnhmuKyjft6CogaOFGwH6oeO4IXJgch9lB2oOEHyuxdGr5Q56eN5
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+qDIHUsvdkW2u8G8lPu3HRxiNyR4aKpXJFC/WWnFWmb26pGVPc7wzmg==
+-----END RSA PRIVATE KEY-----
+
+-----BEGIN CERTIFICATE-----
+MIIC2zCCAcOgAwIBAgIJAKgVvRU/OYMsMA0GCSqGSIb3DQEBCwUAMBgxFjAUBgNV
+BAMMDTE3Mi4xNi4yMTAuMTEwHhcNMjUwMzI3MTAxMDQ5WhcNMzUwMzI1MTAxMDQ5
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+1zz9g1wH6FEebsIeIdka
+-----END CERTIFICATE-----

mockrun-data/ifcfg-eth98

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+DEVICE=eth98
+ONBOOT=yes
+BOOTPROTO=dhcp
+PERSISTENT_DHCLIENT=1

mockrun-data/ifcfg-eth99

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+DEVICE=eth99
+ONBOOT=yes