Automatically resize the root filesystem if needed

scripts/Xresources

@@ -0,0 +1,2 @@
+xterm*faceSize: 12
+xterm*faceName: DejaVu Sans Mono

scripts/install.sh

@@ -93,7 +93,9 @@ if [ $? -ne 0 ]; then
     REBOOT=true
 fi
 
-# Install xinitrc
+# Install .Xresources & .xinitrc
+cp scripts/Xresources ~pi/.Xresources
+chown pi:pi ~pi/.Xresources
 cp scripts/xinitrc ~pi/.xinitrc
 chmod +x ~pi/.xinitrc
 chown pi:pi ~pi/.xinitrc
@@ -133,6 +135,13 @@ if $UPDATE_PY; then
     chmod 777 $HTTP_DIR
 fi
 
+# Expand the file system if necessary
+chmod +x ./scripts/resize_root_fs.sh
+./scripts/resize_root_fs.sh
+if [ $? -eq 0 ]; then
+    REBOOT=true
+fi
+
 sync
 
 if $REBOOT; then

scripts/resize2fs_once

@@ -0,0 +1,25 @@
+#!/bin/sh
+### BEGIN INIT INFO
+# Provides:          resize2fs_once
+# Required-Start:
+# Required-Stop:
+# Default-Start: 3
+# Default-Stop:
+# Short-Description: Resize the root filesystem to fill partition
+# Description:
+### END INIT INFO
+. /lib/lsb/init-functions
+case "$1" in
+  start)
+    log_daemon_msg "Starting resize2fs_once"
+    ROOT_DEV=$(findmnt / -o source -n) &&
+    resize2fs $ROOT_DEV &&
+    update-rc.d resize2fs_once remove &&
+    rm /etc/init.d/resize2fs_once &&
+    log_end_msg $?
+    ;;
+  *)
+    echo "Usage: $0 start" >&2
+    exit 3
+    ;;
+esac

scripts/resize_root_fs.sh

@@ -0,0 +1,81 @@
+#!/bin/bash
+
+# Used by the OneFinity firmware to determine if the root filesystem
+# needs to be enlarged to maximize usage of the SD card.
+#
+# The majority of this code originates from /usr/lib/raspi-config/init_resize.sh
+
+get_fs_resize_variables () {
+    ROOT_PART_DEV=$(findmnt / -o source -n)
+    ROOT_PART_NAME=$(echo "$ROOT_PART_DEV" | cut -d "/" -f 3)
+    ROOT_DEV_NAME=$(echo /sys/block/*/"${ROOT_PART_NAME}" | cut -d "/" -f 4)
+    ROOT_DEV="/dev/${ROOT_DEV_NAME}"
+    ROOT_PART_NUM=$(cat "/sys/block/${ROOT_DEV_NAME}/${ROOT_PART_NAME}/partition")
+    BOOT_PART_DEV=$(findmnt /boot -o source -n)
+    BOOT_PART_NAME=$(echo "$BOOT_PART_DEV" | cut -d "/" -f 3)
+    BOOT_DEV_NAME=$(echo /sys/block/*/"${BOOT_PART_NAME}" | cut -d "/" -f 4)
+    ROOT_DEV_SIZE=$(cat "/sys/block/${ROOT_DEV_NAME}/size")
+    TARGET_END=$((ROOT_DEV_SIZE - 1))
+    PARTITION_TABLE=$(parted -m "$ROOT_DEV" unit s print | tr -d 's')
+    LAST_PART_NUM=$(echo "$PARTITION_TABLE" | tail -n 1 | cut -d ":" -f 1)
+    ROOT_PART_LINE=$(echo "$PARTITION_TABLE" | grep -e "^${ROOT_PART_NUM}:")
+    ROOT_PART_END=$(echo "$ROOT_PART_LINE" | cut -d ":" -f 3)
+}
+
+should_resize_root_partition() {
+    get_fs_resize_variables
+
+    ( set -o posix ; set )
+   
+    if [ "$BOOT_DEV_NAME" != "$ROOT_DEV_NAME" ]; then
+        FAIL_REASON="Boot and root partitions are on different devices"
+        return 1
+    fi
+
+    if [ "$ROOT_PART_NUM" -ne "$LAST_PART_NUM" ]; then
+        FAIL_REASON="Root partition should be last partition"
+        return 1
+    fi
+
+    if [ "$ROOT_PART_END" -gt "$TARGET_END" ]; then
+        FAIL_REASON="Root partition runs past the end of device"
+        echo $FAIL_REASON
+        return 1
+    fi
+
+    if [ ! -b "$ROOT_DEV" ] || [ ! -b "$ROOT_PART_DEV" ] || [ ! -b "$BOOT_PART_DEV" ] ; then
+        FAIL_REASON="Could not determine partitions"
+        return 1
+    fi
+
+    if [ "$ROOT_PART_END" -eq "$TARGET_END" ]; then
+        FAIL_REASON="Root partition is already expanded"
+        return 1
+    fi
+}
+
+if should_resize_root_partition; then
+    grep "init_resize" /boot/cmdline.txt >/dev/null
+    if [ $? -ne 0 ]; then
+        # On the next boot, init_resize.sh will:
+        #   Resize the root partition to use the rest of the SD card
+        #   Remove itself from /boot/cmdline.txt
+        #   Reboot the machine
+        sudo mount /boot -o rw,remount
+        sed -i 's/\(.*\)/\1 init=\/usr\/lib\/raspi-config\/init_resize.sh/' /boot/cmdline.txt
+    fi
+
+    # On the first boot after init_resize, resize2fs_once will:
+    #   Resize the root fs to fill its partition
+    #   Remove itself from the registered systemd services
+    #   Delete itself from the filesystem
+    #   Therefore, never run again
+    cp scripts/resize2fs_once /etc/init.d/resize2fs_once
+    chmod +x /etc/init.d/resize2fs_once
+    systemctl enable resize2fs_once
+
+    exit 0
+else
+    echo "Not resizing root partition: $FAIL_REASON"
+    exit 1
+fi

scripts/xinitrc

@@ -14,6 +14,8 @@ while true; do
         sed -i 's/"exited_cleanly":false/"exited_cleanly":true/' $PREFS
         sed -i 's/"exit_type":"Crashed"/"exit_type":"Normal"/' $PREFS
 
+        xrdb /home/pi/.Xresources
+
         # Start browser
         /usr/local/bin/browser --no-first-run --disable-infobars \
          --noerrdialogs --disable-3d-apis http://localhost/