Adding script to run archiso in qemu

scripts/run_archiso.sh:
A script to run a built archiso image using qemu.
It can run the image on an emulated BIOS (using seabios) or UEFI (using edk2-ovmf) system.

.gitlab-ci.yml:
Adding scripts/run_archiso.sh to shellcheck call.

Closes #28

.gitlab-ci.yml

@@ -14,3 +14,4 @@ lint:
         configs/{baseline,releng}/build.sh
         configs/releng/airootfs/root/.automated_script.sh
         configs/releng/airootfs/usr/local/bin/choose-mirror
+        scripts/run_archiso.sh

scripts/run_archiso.sh

@@ -0,0 +1,155 @@
+#!/usr/bin/env bash
+#
+# Copyright (C) 2020 David Runge <dvzrv@archlinux.org>
+#
+# SPDX-License-Identifier: GPL-3.0-or-later
+#
+# A simple script to run an archiso image using qemu. The image can be booted
+# using BIOS or UEFI.
+#
+# Requirements:
+# - qemu
+# - edk2-ovmf (when UEFI booting)
+
+
+set -eu
+
+print_help() {
+    cat << EOF
+Usage:
+    run_archiso [options]
+
+Options:
+    -b              set boot type to 'bios' (default)
+    -h              print help
+    -i [image]      image to boot into
+    -s              use secure boot (only relevant when using UEFI)
+    -u              set boot type to 'uefi'
+
+Example:
+    Run an image using UEFI:
+    $ run_archiso -u -i archiso-2020.05.23-x86_64.iso
+EOF
+}
+
+cleanup_working_dir() {
+    if [ -d "${working_dir}" ]; then
+        rm -rf "${working_dir}"
+    fi
+}
+
+copy_ovmf_vars() {
+    if [ ! -f /usr/share/edk2-ovmf/x64/OVMF_VARS.fd ]; then
+        echo "ERROR: OVMF_VARS.fd not found. Install edk2-ovmf."
+        exit 1
+    fi
+    cp -av /usr/share/edk2-ovmf/x64/OVMF_VARS.fd "${working_dir}"
+}
+
+check_image() {
+    if [ -z "$image" ]; then
+        echo "ERROR: Image name can not be empty."
+        exit 1
+    fi
+    if [ ! -f "$image" ]; then
+        echo "ERROR: Image file ($image) does not exist."
+        exit 1
+    fi
+}
+
+run_image() {
+    [ "$boot_type" == "bios" ] && run_image_using_bios
+    [ "$boot_type" == "uefi" ] && run_image_using_uefi
+}
+
+run_image_using_bios() {
+    qemu-system-x86_64 \
+        -boot order=d,menu=on,reboot-timeout=5000 \
+        -m size=3072,slots=0,maxmem=$((3072*1024*1024)) \
+        -k en \
+        -name archiso,process=archiso_0 \
+        -drive file="${image}",media=cdrom,readonly=on,if=virtio \
+        -display sdl \
+        -vga virtio \
+        -device virtio-net-pci,netdev=net0 -netdev user,id=net0 \
+        -enable-kvm \
+        -no-reboot
+}
+
+run_image_using_uefi() {
+    local ovmf_code=/usr/share/edk2-ovmf/x64/OVMF_CODE.fd
+    local secure_boot_state=off
+    copy_ovmf_vars
+    if [ "${secure_boot}" == "yes" ]; then
+        echo "Using Secure Boot"
+        ovmf_code=/usr/share/edk2-ovmf/x64/OVMF_CODE.secboot.fd
+        secure_boot_state=on
+    fi
+    qemu-system-x86_64 \
+        -boot order=d,menu=on,reboot-timeout=5000 \
+        -m size=3072,slots=0,maxmem=$((3072*1024*1024)) \
+        -k en \
+        -name archiso,process=archiso_0 \
+        -drive file="${image}",media=cdrom,readonly=on,if=virtio \
+        -drive if=pflash,format=raw,unit=0,file="${ovmf_code}",readonly \
+        -drive if=pflash,format=raw,unit=1,file="${working_dir}/OVMF_VARS.fd" \
+        -machine type=q35,smm=on,accel=kvm \
+        -global driver=cfi.pflash01,property=secure,value="${secure_boot_state}" \
+        -global ICH9-LPC.disable_s3=1 \
+        -display sdl \
+        -vga virtio \
+        -device virtio-net-pci,netdev=net0 -netdev user,id=net0 \
+        -enable-kvm \
+        -no-reboot
+}
+
+set_image() {
+    if [ -z "$image" ]; then
+        echo "ERROR: Image name can not be empty."
+        exit 1
+    fi
+    if [ ! -f "$image" ]; then
+        echo "ERROR: Image ($image) does not exist."
+        exit 1
+    fi
+    image="$1"
+}
+
+image=""
+boot_type="bios"
+secure_boot="no"
+working_dir="$(mktemp -d)"
+trap cleanup_working_dir EXIT
+
+if [ ${#@} -gt 0 ]; then
+    while getopts 'bhi:su' flag; do
+        case "${flag}" in
+            b)
+                boot_type=bios
+                ;;
+            h)
+                print_help
+                exit 0
+                ;;
+            i)
+                image="$OPTARG"
+                ;;
+            u)
+                boot_type=uefi
+                ;;
+            s)
+                secure_boot=yes
+                ;;
+            *)
+                echo "Error: Wrong option. Try 'run_archiso -h'."
+                exit 1
+                ;;
+        esac
+    done
+else
+    print_help
+    exit 1
+fi
+
+check_image
+run_image