build_iso.sh: Allow IPXE_NET to be defined in the yaml

And fallback generation to the default hard-coded name otherwise.

Refs. sysadm-environment#5250

configs/build_iso.sh

@@ -16,6 +16,9 @@ fi
 
 j2 -f yaml "${BASEDIR}/configs/template.ipxe.j2" "${CONFIG}" >"${IPXE_SCRIPT}"
 
+# If not provided in the hostname configuration, fallback to the net0
+sed -i s'/{{IPXE_NET}}/net0/g' "${IPXE_SCRIPT}"
+
 IPXE_TARGET=bin-x86_64-efi/ipxe.iso
 
 make -C "${BASEDIR}/src" -j8 "${IPXE_TARGET}" EMBED="${IPXE_SCRIPT}" DEBUG=eth_slow NO_WERROR=1

configs/rancher-node-staging-rke2-metal01.yaml

@@ -9,6 +9,7 @@ DOMAINNAME: internal.staging.swh.network
 DEPLOYMENT: staging
 SUBNET: sesi_rocquencourt_staging
 BOOT_DISK_ID_PATTERN: "wwn-0x61866da0734677001fbdcb6b0f36a29c"
+IPXE_NET: net8
 # 1 raid virtual disk (and no boot controller disk)
 # PARTMAN_METHOD: raid
 # RAID_DISKS:

configs/template.ipxe.j2

 #!ipxe
 
 # Open the network interface; this sets up the lacp responder
-ifopen net0
+ifopen {{IPXE_NET}}
 
 prompt --key 0x02 --timeout 60000 waiting 60s for lacp to come up && shell ||
 
-# Bring up a tagged VLAN interface on net0 (net0-{{VLAN_ID}})
-vcreate --tag {{VLAN_ID}} net0
+# Bring up a tagged VLAN interface on {{IPXE_NET}} ({{IPXE_NET}}-{{VLAN_ID}})
+vcreate --tag {{VLAN_ID}} {{IPXE_NET}}
 
-set net0-{{VLAN_ID}}/ip {{IPADDRESS}}
-set net0-{{VLAN_ID}}/netmask {{NETMASK}}
-set net0-{{VLAN_ID}}/gateway {{GATEWAY}}
+set {{IPXE_NET}}-{{VLAN_ID}}/ip {{IPADDRESS}}
+set {{IPXE_NET}}-{{VLAN_ID}}/netmask {{NETMASK}}
+set {{IPXE_NET}}-{{VLAN_ID}}/gateway {{GATEWAY}}
+set ipxe_gateway {{GATEWAY}}
 set dns {{NAMESERVER}}
 
 
@@ -20,7 +21,7 @@ set dns {{NAMESERVER}}
 
 prompt --key 0x02 --timeout 2000 Press Ctrl-B for the iPXE command line... && shell ||
 
-ping --count 1 ${net0-{{VLAN_ID}}/gateway} && goto installer ||
+ping --count 1 ${ipxe_gateway} && goto installer ||
 
 echo "Could not ping gateway, retrying..."
 goto cli_prompt