Update iPXE build script

Replace `ipxe-update.sh` with `scripts/build-ipxe.sh`.

* correctly builds for arm64
* supports additional configuration from environment variables
* intended for use on an installed system

Signed-off-by: Jonathon Anderson <janderson@ciq.com>

scripts/build-ipxe.sh

@@ -0,0 +1,99 @@
+#!/bin/sh
+
+set -e
+
+TARGETS=${TARGETS:-"bin-x86_64-pcbios/undionly.kpxe bin-x86_64-efi/snponly.efi bin-arm64-efi/snponly.efi"}
+IPXE_BRANCH=${IPXE_BRANCH:-master}
+DESTDIR=${DESTDIR:-/usr/local/share/ipxe}
+
+CPUS=$(grep 'processor.*:' /proc/cpuinfo | wc -l)
+
+
+function usage {
+  echo "Usage: $(basename $0)
+        [-h] (help)
+
+TARGETS: ${TARGETS}
+IPXE_BRANCH: ${IPXE_BRANCH}
+DESTDIR: ${DESTDIR}"
+  exit 1
+}
+
+
+function main {
+  local DESTDIR=$(readlink -f ${DESTDIR})
+
+  while getopts 'h' c
+  do
+    case $c in
+      h|*) usage
+        ;;
+    esac
+  done
+
+  TMPDIR=`mktemp -d /tmp/ipxebuild.XXXXXX`
+  trap "rm -rf $TMPDIR" EXIT
+  cd "$TMPDIR"
+
+  git clone --branch "${IPXE_BRANCH}" https://github.com/ipxe/ipxe.git
+
+  cd ipxe/src
+
+  for target in ${TARGETS}
+  do
+    if $(echo "$target" | grep -q "\-arm64-")
+    then
+      if ! which aarch64-linux-gnu-gcc >/dev/null 2>&1
+      then
+        echo 1>&2 "aarch64-linux-gnu-gcc not found: not building for arm64"
+        continue
+      fi
+      CROSS=aarch64-linux-gnu-
+      configure_arm64
+    else
+      CROSS=""
+      configure_x86_64
+    fi
+    destname=$(echo $target | tr / -)
+    make -j $CPUS CROSS="${CROSS}" $target "$@" && cp -v $target ${DESTDIR}/${destname}
+    restore_config
+  done
+}
+
+
+function configure_arm64 {
+  # CONSOLE_SERIAL causes build failure for aarch64, so omitting here
+  # https://github.com/ipxe/ipxe/issues/658
+  sed -i.bak \
+      -e 's,//\(#define.*CONSOLE_FRAMEBUFFER.*\),\1,' \
+      config/console.h
+
+  sed -i.bak \
+      -e 's,//\(#define.*IMAGE_ZLIB.*\),\1,' \
+      -e 's,//\(#define.*IMAGE_GZIP.*\),\1,' \
+      -e 's,//\(#define.*VLAN_CMD.*\),\1,' \
+      config/general.h
+}
+
+
+function configure_x86_64 {
+  sed -i.bak \
+      -e 's,//\(#define.*CONSOLE_SERIAL.*\),\1,' \
+      -e 's,//\(#define.*CONSOLE_FRAMEBUFFER.*\),\1,' \
+      config/console.h
+
+  sed -i.bak \
+      -e 's,//\(#define.*IMAGE_ZLIB.*\),\1,' \
+      -e 's,//\(#define.*IMAGE_GZIP.*\),\1,' \
+      -e 's,//\(#define.*VLAN_CMD.*\),\1,' \
+      config/general.h
+}
+
+
+function restore_config {
+  cp config/console.h{.bak,}
+  cp config/general.h{.bak,}
+}
+
+
+main "$@"