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[RDY] Format domain XML from a file to allow for more flexibility #903

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[RDY] Format domain XML from a file to allow for more flexibility #903

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26 changes: 26 additions & 0 deletions nix/libvirtd.nix
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Original file line number Diff line number Diff line change
Expand Up @@ -53,6 +53,32 @@ in
'';
};

deployment.libvirtd.template = mkOption {
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I guess I'm confused what's the point of having this as a nixops option ?
What if someone changes this to:

deployment.libvirtd.template = ''
<other template that doesn't use the same variables>
''

That'll basically make it inconsistent with what the python code expects

type = types.str;
default = ''<domain type="{domain_type}">
<name>{name}</name>
<memory unit="MiB">{memory_size}</memory>
<vcpu>{vcpu}</vcpu>
{os}
<devices>
<emulator>{emulator}</emulator>
<disk type="file" device="disk">
<driver name="qemu" type="qcow2"/>
<source file="{diskPath}"/>
<target dev="hda"/>
</disk>
{interfaces}
<input type="keyboard" bus="usb"/>
<input type="mouse" bus="usb"/>
{extra_devices}
</devices>
{extra_domain}
</domain>'';
description = ''
Template for the libvirt domain. You can use all other parameters.
'';
};

deployment.libvirtd.vcpu = mkOption {
default = 1;
type = types.int;
Expand Down
48 changes: 16 additions & 32 deletions nixops/backends/libvirtd.py
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Original file line number Diff line number Diff line change
Expand Up @@ -29,6 +29,7 @@ def __init__(self, xml, config):

x = xml.find("attrs/attr[@name='libvirtd']/attrs")
assert x is not None
self.domain_tpl = x.find("attr[@name='template']/string").get("value")
self.vcpu = x.find("attr[@name='vcpu']/int").get("value")
self.memory_size = x.find("attr[@name='memorySize']/int").get("value")
self.extra_devices = x.find("attr[@name='extraDevicesXML']/string").get("value")
Expand Down Expand Up @@ -185,38 +186,19 @@ def _make_os(defn):
" <cmdline>%s</cmdline>"% defn.cmdline if len(defn.kernel) > 0 else "",
'</os>']


domain_fmt = "\n".join([
'<domain type="{5}">',
' <name>{0}</name>',
' <memory unit="MiB">{1}</memory>',
' <vcpu>{4}</vcpu>',
'\n'.join(_make_os(defn)),
' <devices>',
' <emulator>{2}</emulator>',
' <disk type="file" device="disk">',
' <driver name="qemu" type="qcow2"/>',
' <source file="{3}"/>',
' <target dev="hda"/>',
' </disk>',
'\n'.join([iface(n) for n in defn.networks]),
' <graphics type="vnc" port="-1" autoport="yes"/>' if not defn.headless else "",
' <input type="keyboard" bus="usb"/>',
' <input type="mouse" bus="usb"/>',
defn.extra_devices,
' </devices>',
defn.extra_domain,
'</domain>',
])

return domain_fmt.format(
self._vm_id(),
defn.memory_size,
qemu,
self._disk_path(defn),
defn.vcpu,
defn.domain_type
result = defn.domain_tpl.format(
name=self._vm_id(),
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Here I tried to replace the memory_size=defn.memory_size, by **defn (more elegant) but couldn't succeed.

memory_size=defn.memory_size,
os='\n'.join(_make_os(defn)),
emulator=qemu,
interfaces='\n'.join([iface(n) for n in defn.networks]),
diskPath=self._disk_path(defn),
vcpu=defn.vcpu,
domain_type=defn.domain_type,
extra_domain=defn.extra_domain,
extra_devices=defn.extra_devices + ('<graphics type="vnc" port="-1" autoport="yes"/>' if not defn.headless else ""),
)
return result

def _parse_ip(self):
"""
Expand Down Expand Up @@ -260,7 +242,9 @@ def start(self):
self.private_ipv4 = self._parse_ip()
else:
self.log("starting...")
self.dom.create()
if self.dom.create() is False:
self.log("Failed to create domain ");
return False
self._wait_for_ip(0)

def get_ssh_name(self):
Expand Down