feat(qemu_template): Add support for user-provided configs.

A custom cloud config can be provided directly via -u or as an existing
config drive image via -c.

build_library/qemu_template.sh

@@ -11,9 +11,13 @@ VM_CDROM=
 VM_NCPUS="`grep -c ^processor /proc/cpuinfo`"
 SSH_PORT=2222
 SSH_KEYS=""
+CONFIG_FILE=""
+CONFIG_IMAGE=""
 SAFE_ARGS=0
 USAGE="Usage: $0 [-a authorized_keys] [--] [qemu options...]
 Options:
+    -u FILE     Cloudinit user-data as either a cloud config or script.
+    -c FILE     Config drive as an iso or fat filesystem image.
     -a FILE     SSH public keys for login access. [~/.ssh/id_{dsa,rsa}.pub]
     -p PORT     The port on localhost to map to the VM's sshd. [2222]
     -s          Safe settings: single simple cpu, ide disks.
@@ -30,9 +34,25 @@ Any arguments after -a and -p will be passed through to qemu, -- may be
 used as an explicit separator. See the qemu(1) man page for more details.
 "
 
+check_conflict() {
+    if [ -n "${CONFIG_FILE}${CONFIG_IMAGE}${SSH_KEYS}" ]; then
+        echo "The -u -c and -a options cannot be combined!" >&2
+        exit 1
+    fi
+}
+
 while [ $# -ge 1 ]; do
     case "$1" in
+        -u|-user-data)
+            check_conflict
+            CONFIG_FILE="$2"
+            shift 2 ;;
+        -c|-config-drive)
+            check_conflict
+            CONFIG_IMAGE="$2"
+            shift 2 ;;
         -a|-authorized-keys)
+            check_conflict
             SSH_KEYS="$2"
             shift 2 ;;
         -p|-ssh-port)
@@ -75,16 +95,17 @@ write_ssh_keys() {
 }
 
 
-CONFIG_DRIVE=$(mktemp -t -d coreos-configdrive.XXXXXXXXXX)
-if [ $? -ne 0 ] || [ ! -d "$CONFIG_DRIVE" ]; then
+if [ -z "${CONFIG_IMAGE}" ]; then
+    CONFIG_DRIVE=$(mktemp -t -d coreos-configdrive.XXXXXXXXXX)
+    if [ $? -ne 0 ] || [ ! -d "$CONFIG_DRIVE" ]; then
         echo "$0: mktemp -d failed!" >&2
         exit 1
-fi
-trap "rm -rf '$CONFIG_DRIVE'" EXIT
-mkdir -p "${CONFIG_DRIVE}/openstack/latest"
+    fi
+    trap "rm -rf '$CONFIG_DRIVE'" EXIT
+    mkdir -p "${CONFIG_DRIVE}/openstack/latest"
 
 
-if [ -n "$SSH_KEYS" ]; then
+    if [ -n "$SSH_KEYS" ]; then
         if [ ! -f "$SSH_KEYS" ]; then
             echo "$0: SSH keys file not found: $SSH_KEYS" >&2
             exit 1
@@ -96,9 +117,16 @@ if [ -n "$SSH_KEYS" ]; then
         fi
         echo "$SSH_KEYS_TEXT" | write_ssh_keys > \
             "${CONFIG_DRIVE}/openstack/latest/user_data"
-else
+    elif [ -n "${CONFIG_FILE}" ]; then
+        cp "${CONFIG_FILE}" "${CONFIG_DRIVE}/openstack/latest/user_data"
+        if [ $? -ne 0 ]; then
+            echo "$0: Failed to copy cloudinit file from $CONFIG_FILE" >&2
+            exit 1
+        fi
+    else
         find_ssh_keys | write_ssh_keys > \
             "${CONFIG_DRIVE}/openstack/latest/user_data"
+    fi
 fi
 
 # Start assembling our default command line arguments
@@ -110,6 +138,17 @@ else
     set -- -cpu host -smp "${VM_NCPUS}" "$@"
 fi
 
+# ${CONFIG_DRIVE} or ${CONFIG_IMAGE} will be mounted in CoreOS as /media/configdrive
+if [ -n "${CONFIG_DRIVE}" ]; then
+    set -- \
+        -fsdev local,id=conf,security_model=none,readonly,path="${CONFIG_DRIVE}" \
+        -device virtio-9p-pci,fsdev=conf,mount_tag=config-2 "$@"
+fi
+
+if [ -n "${CONFIG_IMAGE}" ]; then
+    set -- -drive if=${disk_type},file="${CONFIG_IMAGE}" "$@"
+fi
+
 if [ -n "${VM_IMAGE}" ]; then
     set -- -drive if=${disk_type},file="${SCRIPT_DIR}/${VM_IMAGE}" "$@"
 fi
@@ -127,24 +166,15 @@ if [ -n "${VM_UUID}" ]; then
 fi
 
 if [ -n "${VM_CDROM}" ]; then
-    set -- -cdrom "$VM_CDROM" "$@"
+    set -- -cdrom "${SCRIPT_DIR}/${VM_CDROM}" "$@"
 fi
 
 # Default to KVM, fall back on full emulation
-# ${CONFIG_DRIVE} will be mounted in CoreOS as /media/configdrive
 qemu-system-x86_64 \
     -name "$VM_NAME" \
     -m ${VM_MEMORY} \
     -machine accel=kvm:tcg \
     -net nic,vlan=0,model=virtio \
     -net user,vlan=0,hostfwd=tcp::"${SSH_PORT}"-:22 \
-    -fsdev local,id=conf,security_model=none,readonly,path="${CONFIG_DRIVE}" \
-    -device virtio-9p-pci,fsdev=conf,mount_tag=config-2 \
     "$@"
-RET=$?
-
-
-# Cleanup!
-rm -rf "${CONFIG_DRIVE}"
-trap - EXIT
-exit ${RET}
+exit $?