implemented ADDPART command

ADDPART appends a partition in the SIZE with a partition type and file system

Dockerfile

@@ -2,13 +2,14 @@ FROM debian:bookworm-slim
 
 LABEL description="Reconfigure Raspberry Pi images with an easy, Docker-like configuration file"
 LABEL maintainer="[email protected]"
-LABEL version="0.6.1"
+LABEL version="0.7.0"
 
 RUN bash
 
 RUN apt-get update && \
   apt-get install -y \
   binfmt-support \
+  exfatprogs \
   fdisk \
   file \
   git \

README.md

@@ -198,6 +198,9 @@ This is an alternative to `FROM` and `TO`.
 ##### `PUMP SIZE`
 `PUMP` increases the image's size about the given amount (suffixes K, M, G are allowed).
 
+##### `ADDPART SIZE PTYPE FS`
+`PUMP` appends a partition of the size (suffixes K, M, G are allowed) using a partion type and file system (ext4, exfat, ...).
+
 #### 3. Chroot Stage
 ##### `INSTALL <MODE> SOURCE DEST`
 `INSTALL` installs a given file or directory into the destination in the image.

stages/00-commands.sh

@@ -44,6 +44,10 @@ PUMP() {
   :
 }
 
+ADDPART() {
+  :
+}
+
 # Stage 3x
 INSTALL() {
   :

stages/20-prepare.sh

@@ -42,3 +42,63 @@ PUMP() {
 
   umount_image "${loop}"
 }
+
+# ADDPART adds a partition of a given size, partition type and file system
+#
+# Usage: ADDPART SIZE PTYPE FS
+ADDPART() {
+  if [ $# -ne 3 ]; then
+    echo -e "\033[0;31m### Error: usage ADDPART SIZE PTYPE FS\033[0m"
+    return 1
+  fi
+
+  echo -e "\033[0;32m### ADDPART ${1} ${2} ${3}\033[0m"
+
+  if [[ -b "${DEST_IMG}" ]]; then
+    echo -e "\033[0;31m### Error: Block device ${DEST_IMG} cannot be altered.\033[0m"
+    return 1
+  fi
+
+  BS="1M"
+
+  # units does not print to stderr, thus test call before using output
+  echo -n "addpart conversion to ${BS} * "
+  units -t "${1}B" "${BS}B"
+
+  COUNT=$(units -t ${1}B ${BS}B)
+
+  # Ceil the number if a decimal is given.
+  if [[ "${COUNT}" == *.* ]]; then
+    COUNT=$(( $(echo "${COUNT}" | cut -d. -f1) + 1 ))
+  fi
+
+  echo "addpart ceil: ${BS} * ${COUNT}"
+
+  # Error on unset PTYPE
+  if [[ -z ${2+x} ]]; then
+    echo -e "\033[0;31m### Error: Partition type unspecified, possible options:\033[0m"
+    sfdisk -T
+    return 1
+  fi
+
+  echo "checking mkfs.${3}"
+
+  if ! command -v mkfs.${3}; then
+    echo -e "\033[0;31m### Error: file system ${3} is not available.\033[0m"
+    return 1
+  fi
+
+  dd if=/dev/zero bs="${BS}" count="${COUNT}" >> "${DEST_IMG}"
+
+  local data_part_start
+  data_part_start=$(( $(sfdisk -l "${DEST_IMG}" -o END -n | tail -n1) + 1 ))
+
+  echo "$data_part_start,+,${2}" | sfdisk -a "${DEST_IMG}"
+
+  local loop
+  loop=$(mount_image "${DEST_IMG}")
+
+  mkfs.${3} "/dev/mapper/${loop}p$((IMG_ROOT + 1))"
+
+  umount_image "${loop}"
+}