Add ARGUMENTS variable

Add ARGUMENTS variable

readme.md

@@ -69,6 +69,8 @@ docker run -it --rm -e "BOOT=http://www.example.com/image.iso" --device=/dev/kvm
         DISK_SIZE: "256G"
     ```
     
+    This can also be used to resize the existing disk to a larger capacity without data loss.
+    
   * ### How do I change the location of the data disk?
 
     To change the data disk's location from the default Docker volume, include the following bind mount in your compose file:
@@ -80,17 +82,6 @@ docker run -it --rm -e "BOOT=http://www.example.com/image.iso" --device=/dev/kvm
 
     Replace the example path `/home/user/data` with the desired storage folder.
 
-  * ### How do I change the space reserved by the data disk? 
-
-    By default, the entire disk space is reserved in advance. To create a growable disk that only reserves the space that is actually used, add the following environment variable:
-
-    ```yaml
-    environment:
-        ALLOCATE: "N"
-    ```
-
-    Keep in mind that this will not affect any of your existing disks, it only applies to newly created disks.
-
   * ### How do I increase the amount of CPU or RAM?
 
     By default, a single core and 512 MB of RAM are allocated to the container. To increase this, add the following environment variables:
@@ -112,6 +103,15 @@ docker run -it --rm -e "BOOT=http://www.example.com/image.iso" --device=/dev/kvm
 
     If you receive an error from `kvm-ok` indicating that KVM acceleration can't be used, check your BIOS settings.
     
+  * ### How do I provide extra arguments to QEMU?
+
+    You can create the `ARGUMENTS` environment variable to provide additional arguments to QEMU at runtime:
+
+    ```yaml
+    environment:
+        ARGUMENTS: "-drive file=/seed.iso,format=raw,if=virtio"
+    ```
+
   * ### How do I assign an individual IP address to the container?
 
     By default, the container uses bridge networking, which shares the IP address with the host. 

run/disk.sh

@@ -26,7 +26,9 @@ if [ -f "${DATA}" ]; then
     if [[ "${ALLOCATE}" == [Nn]* ]]; then
 
       # Resize file by changing its length
-      truncate -s "${DATA_SIZE}" "${DATA}"; 
+      if ! truncate -s "${DATA_SIZE}" "${DATA}"; then
+        error "Could not resize the file for the data disk." && exit 85
+      fi
 
     else
 
@@ -42,7 +44,9 @@ if [ -f "${DATA}" ]; then
 
       # Resize file by allocating more space
       if ! fallocate -l "${DATA_SIZE}" "${DATA}"; then
-        error "Could not allocate a file for the data disk." && exit 85
+        if ! truncate -s "${DATA_SIZE}" "${DATA}"; then
+          error "Could not resize the file for the data disk." && exit 85
+        fi
       fi
 
       if [[ "${ALLOCATE}" == [Zz]* ]]; then
@@ -71,7 +75,10 @@ if [ ! -f "${DATA}" ]; then
   if [[ "${ALLOCATE}" == [Nn]* ]]; then
 
     # Create an empty file
-    truncate -s "${DATA_SIZE}" "${DATA}"
+    if ! truncate -s "${DATA_SIZE}" "${DATA}"; then
+      rm -f "${DATA}"
+      error "Could not create a file for the data disk." && exit 87
+    fi
 
   else
 
@@ -85,8 +92,10 @@ if [ ! -f "${DATA}" ]; then
 
     # Create an empty file
     if ! fallocate -l "${DATA_SIZE}" "${DATA}"; then
-      rm -f "${DATA}"
+      if ! truncate -s "${DATA_SIZE}" "${DATA}"; then
-      error "Could not allocate a file for the data disk." && exit 87
+        rm -f "${DATA}"
+        error "Could not create a file for the data disk." && exit 87
+      fi
     fi
 
     if [[ "${ALLOCATE}" == [Zz]* ]]; then

run/run.sh

@@ -6,6 +6,7 @@ set -Eeuo pipefail
 : ${BOOT:=''}           # URL of the ISO file
 : ${DEBUG:='N'}         # Enable debug mode
 : ${ALLOCATE:='Y'}      # Preallocate diskspace
+: ${ARGUMENTS:=''}      # Extra QEMU parameters
 : ${CPU_CORES:='1'}     # Amount of CPU cores
 : ${DISK_SIZE:='16G'}   # Initial data disk size
 : ${RAM_SIZE:='512M'}   # Maximum RAM amount
@@ -21,6 +22,7 @@ trap 'error "Status $? while: ${BASH_COMMAND} (line $LINENO/$BASH_LINENO)"' ERR
 
 STORAGE="/storage"
 KERNEL=$(uname -r | cut -b 1)
+MINOR=$(uname -r | cut -d '.' -f2)
 ARCH=$(dpkg --print-architecture)
 VERS=$(qemu-system-x86_64 --version | head -n 1 | cut -d '(' -f 1)
 
@@ -66,7 +68,7 @@ MAC_OPTS="-machine type=q35,usb=off,dump-guest-core=off,hpet=off${KVM_OPTS}"
 SERIAL_OPTS="-serial mon:stdio -device virtio-serial-pci,id=virtio-serial0,bus=pcie.0,addr=0x3"
 EXTRA_OPTS="-device virtio-balloon-pci,id=balloon0 -object rng-random,id=rng0,filename=/dev/urandom -device virtio-rng-pci,rng=rng0"
 
-ARGS="${DEF_OPTS} ${CPU_OPTS} ${RAM_OPTS} ${MAC_OPTS} ${MON_OPTS} ${SERIAL_OPTS} ${NET_OPTS} ${DISK_OPTS} ${EXTRA_OPTS}"
+ARGS="${DEF_OPTS} ${CPU_OPTS} ${RAM_OPTS} ${MAC_OPTS} ${MON_OPTS} ${SERIAL_OPTS} ${NET_OPTS} ${DISK_OPTS} ${EXTRA_OPTS} ${ARGUMENTS}"
 ARGS=$(echo "$ARGS" | sed 's/\t/ /g' | tr -s ' ')
 
 trap - ERR
@@ -79,7 +81,7 @@ set -m
 )
 set +m
 
-if (( KERNEL > 4 )); then
+if (( KERNEL > 5 )) || ( (( KERNEL == 5 )) && (( MINOR > 2 )) ); then
   pidwait -F "${_QEMU_PID}" & wait $!
 else
   tail --pid "$(cat "${_QEMU_PID}")" --follow /dev/null & wait $!