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https://github.com/retspen/webvirtcloud
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A disk-only snapshot was taken without any space check, though its overlays grow as the guest writes and a later delete merges them down; a full pool pauses the guest and can leave the snapshot undeletable. Only a memory snapshot was checked, for the memory alone. Before a snapshot, each storage pool with a disk of the VM must have free a share of those disks' virtual size (10%, at least 1 GiB), and the pool of the memory file the VM's memory on top. Both values are on the Settings page (Snapshot Free Percent, Snapshot Free Min GiB; 0 turns a rule off, an invalid value keeps the default). The pools are refreshed first, and a failed refresh or an unreadable volume refuses the snapshot instead of skipping the check; a disk in no pool is not checked. Nothing is reserved: later writes can still fill a pool.
35 lines
1.4 KiB
Python
35 lines
1.4 KiB
Python
from django.core.management.color import no_style
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from django.db import migrations
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SETTINGS = [
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("Snapshot Free Percent", "SNAPSHOT_FREE_SPACE_PERCENT", "10",
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"Free space a storage pool keeps for a snapshot, in percent of the VM's disks in it (0: none)"),
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("Snapshot Free Min GiB", "SNAPSHOT_FREE_SPACE_MIN_GIB", "1",
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"Free space a storage pool keeps for a snapshot at least, in GiB (0: none)"),
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]
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def add_settings(apps, schema_editor):
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setting = apps.get_model("appsettings", "AppSettings")
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db_alias = schema_editor.connection.alias
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# see 0014: move a PostgreSQL id sequence past the fixed ids first
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with schema_editor.connection.cursor() as cursor:
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for sql in schema_editor.connection.ops.sequence_reset_sql(no_style(), [setting]):
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cursor.execute(sql)
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for name, key, value, description in SETTINGS:
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setting.objects.using(db_alias).get_or_create(
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key=key, defaults={"name": name, "value": value, "choices": "", "description": description}
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)
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def del_settings(apps, schema_editor):
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setting = apps.get_model("appsettings", "AppSettings")
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db_alias = schema_editor.connection.alias
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setting.objects.using(db_alias).filter(key__in=[key for _, key, _, _ in SETTINGS]).delete()
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class Migration(migrations.Migration):
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dependencies = [("appsettings", "0016_nic_type_rtl8139")]
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operations = [migrations.RunPython(add_settings, del_settings)]
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