Allow setting user name and password from config

Add FIRST_USER_NAME and FIRST_USER_PASS variables that can be set
in the config (or enviroment). Defaults to the standard pi and
raspberry.

README.md

@@ -73,6 +73,13 @@ The following environment variables are supported:
    Setting to '1' enables the QEMU mode - creating an image that can be mounted via QEMU for an emulated
    environment. These images include "-qemu" in the image file name.
 
+ * `FIRST_USER_NAME` (Default: "pi" )
+
+   Username for the first user
+
+ * `FIRST_USER_PASS` (Default: "raspberry")
+
+   Password for the first user
 
 A simple example for building Raspbian:
 

build.sh

@@ -141,6 +141,9 @@ export WORK_DIR="${WORK_DIR:-"${BASE_DIR}/work/${IMG_DATE}-${IMG_NAME}"}"
 export DEPLOY_DIR=${DEPLOY_DIR:-"${BASE_DIR}/deploy"}
 export LOG_FILE="${WORK_DIR}/build.log"
 
+export FIRST_USER_NAME=${FIRST_USER_NAME:-pi}
+export FIRST_USER_PASS=${FIRST_USER_PASS:-raspberry}
+
 export BASE_DIR
 
 export CLEAN

stage1/01-sys-tweaks/00-run.sh

@@ -5,10 +5,10 @@ install -m 644 files/noclear.conf "${ROOTFS_DIR}/etc/systemd/system/getty@tty1.s
 install -v -m 644 files/fstab "${ROOTFS_DIR}/etc/fstab"
 
 on_chroot << EOF
-if ! id -u pi >/dev/null 2>&1; then
-	adduser --disabled-password --gecos "" pi
+if ! id -u ${FIRST_USER_NAME} >/dev/null 2>&1; then
+	adduser --disabled-password --gecos "" ${FIRST_USER_NAME}
 fi
-echo "pi:raspberry" | chpasswd
+echo "${FIRST_USER_NAME}:${FIRST_USER_PASS}" | chpasswd
 echo "root:root" | chpasswd
 EOF
 

stage2/01-sys-tweaks/01-run.sh

@@ -62,12 +62,12 @@ systemctl enable resize2fs_once
 EOF
 fi
 
-on_chroot << \EOF
+on_chroot <<EOF
 for GRP in input spi i2c gpio; do
-	groupadd -f -r "$GRP"
+	groupadd -f -r "\$GRP"
 done
 for GRP in adm dialout cdrom audio users sudo video games plugdev input gpio spi i2c netdev; do
-  adduser pi $GRP
+  adduser $FIRST_USER_NAME \$GRP
 done
 EOF