WHY IS LVM THE WORST THING ON THIS PLANET

aif.xsd

@@ -501,22 +501,24 @@
                                                             </xs:sequence>
                                                         </xs:complexType>
                                                     </xs:element>
-                                                    <xs:element name="tags" minOccurs="0" maxOccurs="1">
+                                                    <!-- PV creation doesn't really support tags, it seems,
-                                                        <xs:complexType>
+                                                         in libblockdev. So we'll simplify and just skip them. -->
-                                                            <xs:sequence>
+<!--                                                    <xs:element name="tags" minOccurs="0" maxOccurs="1">-->
-                                                                <xs:element name="tag" type="aif:t_nonempty"
+<!--                                                        <xs:complexType>-->
-                                                                            minOccurs="1" maxOccurs="unbounded"/>
+<!--                                                            <xs:sequence>-->
-                                                            </xs:sequence>
+<!--                                                                <xs:element name="tag" type="aif:t_nonempty"-->
-                                                        </xs:complexType>
+<!--                                                                            minOccurs="1" maxOccurs="unbounded"/>-->
-                                                    </xs:element>
+<!--                                                            </xs:sequence>-->
+<!--                                                        </xs:complexType>-->
+<!--                                                    </xs:element>-->
                                                 </xs:all>
                                                 <xs:attribute name="id" type="xs:ID" use="required"/>
                                                 <xs:attribute name="name" type="aif:t_nonempty" use="required"/>
                                             </xs:complexType>
-                                            <xs:unique name="uniq_vg_tags">
+<!--                                            <xs:unique name="uniq_vg_tags">-->
-                                                <xs:selector xpath="aif:tags"/>
+<!--                                                <xs:selector xpath="aif:tags"/>-->
-                                                <xs:field xpath="tag"/>
+<!--                                                <xs:field xpath="tag"/>-->
-                                            </xs:unique>
+<!--                                            </xs:unique>-->
                                         </xs:element>
                                     </xs:sequence>
                                 </xs:complexType>

aif/__init__.py

@@ -2,7 +2,7 @@ try:
     from . import constants
 except ImportError:
     from . import constants_fallback as constants
-
+from . import constants_fallback
 from . import utils
 from . import disk
 from . import system

aif/disk/lvm.py

@@ -1,3 +1,5 @@
+import uuid
+##
 from . import _common
 import aif.disk.block as block
 import aif.disk.luks as luks
@@ -10,21 +12,181 @@ _BlockDev = _common.BlockDev
 class PV(object):
     def __init__(self, pv_xml, partobj):
         self.xml = pv_xml
+        self.id = self.xml.attrib('id')
+        self.source = self.xml.attrib('source')
+        self.device = partobj
+        if not isinstance(self.device, (block.Disk,
+                                        block.Partition,
+                                        luks.LUKS,
+                                        mdadm.Array)):
+            raise ValueError(('partobj must be of type '
+                              'aif.disk.block.Disk, '
+                              'aif.disk.block.Partition, '
+                              'aif.disk.luks.LUKS, or'
+                              'aif.disk.mdadm.Array'))
         _common.addBDPlugin('lvm')
-        self.devpath = None
+        self.devpath = self.device.devpath
-        pass
+        self.is_pooled = False
+        self.meta = None
+        self._parseMeta()
+
+    def _parseMeta(self):
+        # Note, the "UUID" for LVM is *not* a true UUID (RFC4122) so we don't convert it.
+        # https://unix.stackexchange.com/questions/173722/what-is-the-uuid-format-used-by-lvm
+        # TODO: parity with lvm_fallback.PV._parseMeta
+        #       key names currently (probably) don't match and need to confirm the information's all present
+        meta = {}
+        try:
+            _meta = _BlockDev.lvm.pvinfo(self.devpath)
+        except _BlockDev.LVMError:
+            self.meta = None
+            self.is_pooled = False
+            return()
+        for k in dir(_meta):
+            if k.startswith('_'):
+                continue
+            elif k in ('copy',):
+                continue
+            v = getattr(_meta, k)
+            meta[k] = v
+        self.meta = meta
+        self.is_pooled = True
+        return()
+
+    def prepare(self):
+        try:
+            if not self.meta:
+                self._parseMeta()
+            if self.meta:
+                vg = self.meta['vg_name']
+                # LVM is SO. DUMB.
+                # If you're using LVM, seriously - just switch your model to mdadm. It lets you do things like
+                # remove disks live without restructuring the entire thing.
+                # That said, because the config references partitions/disks/arrays/etc. created *in the same config*,
+                # and it's all dependent on block devices defined in the thing, we can be reckless here.
+                # I'd like to take the time now to remind you to NOT RUN AIF-NG ON A "LIVE" MACHINE.
+                # At least until I can maybe find a better way to determine which LVs to reduce on multi-LV VGs
+                # so I can *then* use lvresize in a balanced manner, vgreduce, and pvmove/pvremove and not kill
+                # everything.
+                # TODO.
+                for lv in _BlockDev.lvm.lvs():
+                    if lv.vg_name == vg:
+                        _BlockDev.lvm.lvremove(vg, lv.lv_name)
+                        _BlockDev.lvm.vgreduce(vg)
+                _BlockDev.lvm.vgremove(vg)  # This *shouldn't* fail. In theory. But LVM is lel.
+                _BlockDev.lvm.pvremove(self.devpath)
+                # Or if I can get this working properly. Shame it isn't automagic.
+                # Seems to kill the LV by dropping a PV under it. Makes sense, but STILL. LVM IS SO DUMB.
+                # _BlockDev.lvm.vgdeactivate(vg)
+                # _BlockDev.lvm.pvremove(self.devpath)
+                # _BlockDev.lvm.vgreduce(vg)
+                # _BlockDev.lvm.vgactivate(vg)
+                ##
+                self.meta = None
+                self.is_pooled = False
+        except _BlockDev.LVMError:
+            self.meta = None
+            self.is_pooled = False
+        u = uuid.uuid4()
+        opts = [_BlockDev.ExtraArg.new('--reportformat', 'json')]
+        # FUCK. LVM. You can't *specify* a UUID.
+        # u = uuid.uuid4()
+        # opts.append(_BlockDev.ExtraArg.new('--uuid', str(u)))
+        _BlockDev.lvm.pvcreate(self.devpath,
+                               0,
+                               0,
+                               opts)
+        self._parseMeta()
+        return()
 
 
 class VG(object):
-    def __init__(self, vg_xml, lv_objs):
+    def __init__(self, vg_xml):
         self.xml = vg_xml
+        self.id = self.xml.attrib('id')
+        self.name = self.xml.attrib('name')
+        self.lvs = []
+        self.pvs = []
+        self.tags = []
+        for te in self.xml.findall('tags/tag'):
+            self.tags.append(te.text)
         _common.addBDPlugin('lvm')
-        self.devpath = None
+        self.devpath = self.name
-        pass
+        self.info = None
+
+    def addPV(self, pvobj):
+        if not isinstance(pvobj, PV):
+            raise ValueError('pvobj must be of type aif.disk.lvm.PV')
+        pvobj.prepare()
+        self.pvs.append(pvobj)
+        return()
+
+    def create(self):
+        if not self.pvs:
+            raise RuntimeError('Cannot create a VG with no PVs')
+        opts = [_BlockDev.ExtraArg.new('--reportformat', 'json')]
+        # FUCK. LVM. You can't *specify* a UUID.
+        # u = uuid.uuid4()
+        # opts.append(_BlockDev.ExtraArg.new('--uuid', str(u)))
+        for t in self.tags:
+            opts.append(_BlockDev.ExtraArg.new('--addtag', t))
+        _BlockDev.lvm.vgcreate(self.name,
+                               [p.devpath for p in self.pvs],
+                               0,
+                               opts)
+        for p in self.pvs:
+            p._parseMeta()
+        self.updateInfo()
+        return()
+
+    def createLV(self, lv_xml = None):
+        # If lv_xml is None, we loop through our own XML.
+        if lv_xml:
+            lv = LV(lv_xml, self)
+            lv.create()
+            self.lvs.append(lv)
+        else:
+            for le in self.xml.findall('logicalVolumes/lv'):
+                pass
+        self.updateInfo()
+        return()
+
+    def start(self):
+        _BlockDev.lvm.vgactivate(self.name)
+        self.updateInfo()
+        return()
+
+    def stop(self):
+        _BlockDev.lvm.vgdeactivate(self.name)
+        self.updateInfo()
+        return()
+
+    def updateInfo(self):
+        _info = _BlockDev.lvm.vginfo(self.name)
+        # TODO: parity with lvm_fallback.VG.updateInfo
+        #       key names currently (probably) don't match and need to confirm the information's all present
+        info = {}
+        for k in dir(_info):
+            if k.startswith('_'):
+                continue
+            elif k in ('copy',):
+                continue
+            v = getattr(_info, k)
+            info[k] = v
+        self.info = info
+        return()
 
 
 class LV(object):
-    def __init__(self, lv_xml, pv_objs):
+    def __init__(self, lv_xml, vgobj):
         self.xml = lv_xml
+        self.id = self.xml.attrib('id')
+        self.name = self.xml.attrib('name')
+        self.size = self.xml.attrib('size')  # Convert to bytes. Can get max from _BlockDev.lvm.vginfo(<VG>).free
+        self.vg = vg_obj
+        if not isinstance(self.vg, VG):
+            raise ValueError('vg_obj must be of type aif.disk.lvm.VG')
         _common.addBDPlugin('lvm')
+
+        self.devpath = None
         pass

aif/disk/lvm_fallback.py

@@ -6,17 +6,53 @@ import aif.disk.mdadm_fallback as mdadm
 
 
 class PV(object):
-    def __init__(self, partobj):
+    def __init__(self, pv_xml, partobj):
+        self.xml = pv_xml
+        self.id = self.xml.attrib('id')
+        self.source = self.xml.attrib('source')
+        self.device = partobj
+        if not isinstance(self.device, (block.Disk,
+                                        block.Partition,
+                                        luks.LUKS,
+                                        mdadm.Array)):
+            raise ValueError(('partobj must be of type '
+                              'aif.disk.block.Disk, '
+                              'aif.disk.block.Partition, '
+                              'aif.disk.luks.LUKS, or'
+                              'aif.disk.mdadm.Array'))
+        # TODO
+        self.devpath = self.device.devpath
+        pass
+
+
+class LV(object):
+    def __init__(self, lv_xml, pv_objs, vg_obj):
+        self.xml = lv_xml
+        self.id = self.xml.attrib('id')
+        self.name = self.xml.attrib('name')
+        self.size = self.xml.attrib('size')  # Convert to bytes. Can get max from _BlockDev.lvm.vginfo(<VG>).free
+        self.pvs = pv_objs
+        self.vg = vg_obj
+        for p in self.pvs:
+            if not isinstance(p, PV):
+                raise ValueError('pv_objs must be a list-like containing aif.disk.lvm.PV items')
+        if not isinstance(self.vg, VG):
+            raise ValueError('vg_obj must be of type aif.disk.lvm.VG')
+        # TODO
         self.devpath = None
         pass
 
 
 class VG(object):
     def __init__(self, vg_xml, lv_objs):
+        self.xml = vg_xml
+        self.id = self.xml.attrib('id')
+        self.name = self.xml.attrib('name')
+        self.lvs = lv_objs
+        for l in self.lvs:
+            if not isinstance(l, LV):
+                raise ValueError('lv_objs must be a list-like containing aif.disk.lvm.LV items')
+        # TODO
         self.devpath = None
         pass
 
-
-class LV(object):
-    def __init__(self, lv_xml, pv_objs):
-        pass

aif/disk/mdadm.py

@@ -17,11 +17,11 @@ class Member(object):
     def __init__(self, member_xml, partobj):
         self.xml = member_xml
         self.device = partobj
-        if not isinstance(self.device, (block.Partition,
+        if not isinstance(self.device, (block.Disk,
-                                        block.Disk,
+                                        block.Partition,
                                         Array,
-                                        lvm.LV,
+                                        luks.LUKS,
-                                        luks.LUKS)):
+                                        lvm.LV)):
             raise ValueError(('partobj must be of type '
                               'aif.disk.block.Disk, '
                               'aif.disk.block.Partition, '
@@ -67,6 +67,7 @@ class Member(object):
         except _BlockDev.MDRaidError:
             pass
         _BlockDev.md.destroy(self.devpath)
+        self._parseDeviceBlock()
         return()
 
 

aif/disk/mdadm_fallback.py

@@ -123,6 +123,7 @@ class Member(object):
             # TODO: logging
             subprocess.run(['mdadm', '--misc', '--zero-superblock', self.devpath])
             self.is_superblocked = False
+        self._parseDeviceBlock()
         return()
 
 class Array(object):

aif/envsetup.py

@@ -12,7 +12,7 @@ import sys
 import tempfile
 import venv
 ##
-import aif.constants
+import aif.constants_fallback
 
 class EnvBuilder(object):
     def __init__(self):
@@ -35,7 +35,7 @@ class EnvBuilder(object):
         # This is SO. DUMB. WHY DO I HAVE TO CALL PIP FROM A SHELL. IT'S WRITTEN IN PYTHON.
         # https://pip.pypa.io/en/stable/user_guide/#using-pip-from-your-program
         # TODO: logging
-        for m in aif.constants.external_deps:
+        for m in aif.constants_fallback.EXTERNAL_DEPS:
             pip_cmd = [os.path.join(self.vdir,
                                     'bin',
                                     'python3'),

examples/aif.xml

@@ -57,15 +57,16 @@
         </luks>
         <lvm>
             <volumeGroup id="vg1" name="group1">
-                <tags>
-                    <tag>data</tag>
-                    <tag>misc</tag>
-                </tags>
                 <physicalVolumes>
                     <pv id="pv1" source="lvm_member1"/>
                 </physicalVolumes>
                 <logicalVolumes>
-                    <lv id="lv1" name="logical1" size="100%"/>
+                    <!-- Default is to add all available PVs in PhysicalVolumes... -->
+                    <lv id="lv1" name="logical1" size="80%"/>
+                    <!-- But you can also explicitly designate them. -->
+                    <lv id="lv2" name="logical1" size="20%">
+                        <pvMember source="pv1"/>
+                    </lv>
                 </logicalVolumes>
             </volumeGroup>
         </lvm>

setup.py

@@ -1,12 +1,12 @@
 import setuptools
-import aif.constants as PROJ_CONST
+import aif.constants_fallback as PROJ_CONST
 
 with open('README', 'r') as fh:
     long_description = fh.read()
 
 setuptools.setup(
         name = 'aif',
-        version = PROJ_CONST.version,
+        version = PROJ_CONST.VERSION,
         author = 'Brent S.',
         author_email = 'bts@square-r00t.net',
         description = 'Arch Installation Framework (Next Generation)',
@@ -32,5 +32,5 @@ setuptools.setup(
         project_urls = {'Documentation': 'https://aif-ng.io/',
                         'Source': 'https://git.square-r00t.net/AIF-NG/',
                         'Tracker': 'https://bugs.square-r00t.net/index.php?project=9'},
-        install_requires = PROJ_CONST.external_deps
+        install_requires = PROJ_CONST.EXTERNAL_DEPS
         )