newvm: Add support for specifying static IP config

Although rare, there are scenarios where we may want to deploy a new
virtual machine with a static, manually-configured IP address.
Anaconda/Dracut support this via the `ip=` kernel command-line argument.
To simplify populating that argument, the `newvm` script now takes
additional command-line arguments for IP address (in CIDR prefix),
default gateway, and name server address(es) and creates the appropriate
string from these discrete values.

newvm.sh

@@ -14,6 +14,27 @@ console=true
 default_groups=true
 graphics=false
 
+gen_dracut_ipconfig() {
+    local hostname=$1
+    local ip_address=$2
+    local gateway=$3
+    local nameserver=$4
+
+    local netmask=$(ipcalc --no-decorate --netmask "${ip_address}")
+    if [ -z "${gateway}" ]; then
+        gateway=$(ipcalc --no-decorate --minaddr "${ip_address}")
+    fi
+    ip_address=$(ipcalc --no-decorate --address "${ip_address}")
+
+    printf 'ip=%s::%s:%s:%s::none:%s\n' \
+        "${ip_address}" \
+        "${gateway}" \
+        "${netmask}" \
+        "${hostname}" \
+        "${nameserver}"
+}
+
+
 usage() {
     printf 'usage: %s [options] name\n' "${0##*/}"
 }
@@ -70,6 +91,27 @@ while [ $# -gt 0 ]; do
     --network=*)
         network="${1#*=}"
         ;;
+    --ip-address)
+        shift
+        ip_address=$1
+        ;;
+    --ip-address=*)
+        ip_address=${1#*=}
+        ;;
+    --gateway)
+        shift
+        gateway=$1
+        ;;
+    --gateway=*)
+        gateway=${1#*=}
+        ;;
+    --nameserver)
+        shift
+        nameserver=$1
+        ;;
+    --nameserver=*)
+        nameserver=${1#=*}
+        ;;
     --domain)
         shift
         dnsdomain=$1
@@ -138,6 +180,24 @@ if [ -z "${LIBVIRT_DEFAULT_URI}" ]; then
     exit 1
 fi
 
+case ${ip_address} in
+'')
+    ipconfig="ip=::::${hostname}::dhcp"
+    ;;
+*/*)
+    ipconfig=$(gen_dracut_ipconfig \
+        "${hostname}" \
+        "${ip_address}" \
+        "${gateway}" \
+        "${nameserver}"
+    )
+    ;;
+*)
+    printf 'Invalid IP configuration: missing prefix length\n' >&2
+    exit 1
+    ;;
+esac
+
 if [ ${fedora} -gt 40 ] && [ ${memory} -lt 4096 ]; then
     printf 'WARNING Fedora 41+ requires at least 4 GB memory to install\n' >&2
     memory=4096
@@ -163,7 +223,7 @@ else
     printf 'Using HTTP proxy: %s\n' "${http_proxy}" >&2
 fi
 
-extra_args="ip=::::${hostname}::dhcp inst.ks=${kickstart}"
+extra_args="${ipconfig} inst.ks=${kickstart}"
 if [ -n "${http_proxy}" ]; then
     extra_args="${extra_args} inst.proxy=${http_proxy}"
     if [ ${fedora} -lt 40 ]; then