feat: initial commit

- have been working on this for some time now
2025-05-30 22:36:55 +10:00
commit cb67816eee
188 changed files with 6145 additions and 0 deletions
@@ -0,0 +1,47 @@
+locals {
+  netmask_to_prefix = {
+    "0.0.0.0"         = 0
+    "128.0.0.0"       = 1
+    "192.0.0.0"       = 2
+    "224.0.0.0"       = 3
+    "240.0.0.0"       = 4
+    "248.0.0.0"       = 5
+    "252.0.0.0"       = 6
+    "254.0.0.0"       = 7
+    "255.0.0.0"       = 8
+    "255.128.0.0"     = 9
+    "255.192.0.0"     = 10
+    "255.224.0.0"     = 11
+    "255.240.0.0"     = 12
+    "255.248.0.0"     = 13
+    "255.252.0.0"     = 14
+    "255.254.0.0"     = 15
+    "255.255.0.0"     = 16
+    "255.255.128.0"   = 17
+    "255.255.192.0"   = 18
+    "255.255.224.0"   = 19
+    "255.255.240.0"   = 20
+    "255.255.248.0"   = 21
+    "255.255.252.0"   = 22
+    "255.255.254.0"   = 23
+    "255.255.255.0"   = 24
+    "255.255.255.128" = 25
+    "255.255.255.192" = 26
+    "255.255.255.224" = 27
+    "255.255.255.240" = 28
+    "255.255.255.248" = 29
+    "255.255.255.252" = 30
+    "255.255.255.254" = 31
+    "255.255.255.255" = 32
+  }
+  prefix_length  = lookup(local.netmask_to_prefix, var.cobbler_netmask, 24)
+  host_bits      = 32 - local.prefix_length
+  total_hosts    = pow(2, local.host_bits)
+  last_usable_ip = local.total_hosts - 2
+
+  # derive subnet base from instance IP
+  cidr_block = cidrsubnet("${incus_instance.this.ipv4_address}/${local.prefix_length}", 0, 0)
+
+  # get the last usable IP
+  gateway_ip = cidrhost(local.cidr_block, local.last_usable_ip)
+}