/pi-packer

An opinionated HashiCorp Packer template with integrated cloud-init to build 'cloud instances-like' images for Raspberry Pi

Primary LanguageHCL

pi-packer

An opinionated HashiCorp Packer template for Raspberry Pi images, built around the packer-builder-arm ARM Packer builder plugin. It implements cloud-init for last-mile OS configuration and management.

See pi.pkr.hcl.

Usage

1. Configuration values

Copy example.pkrvars.hcl and edit.

(See Packer docs for more ways to set input variables)

2. Build

(e.g. using usb-gadget/usb_gadget.pkrvars.hcl)

docker run --rm --privileged \
    -v /dev:/dev \
    -v ${PWD}:/build \
    mkaczanowski/packer-builder-arm \
        build \
        -var-file=usb-gadget/usb_gadget.pkrvars.hcl \
        -var "git_repo=$(git remote get-url origin)" \
        -var "git_commit=$(git rev-parse HEAD)" \
        pi.pkr.hcl

(Using the above Docker image and run command is the easiest way to build cross-platform ARM images. See packer-builder-arm for alternative ways to run Packer with the packer-builder-arm plugin)

Inputs

Name Description Type Default Required
boot_cmdline /boot/cmdline.txt config.

Linux kernel boot parameters, as a list. Will be joined as a space-delimited string.

e.g.:
boot_cmdline = [
    "abc",
    "def"
]
Will create /boot/cmdline.txt as
abc def
 list(string) 
[
  "console=serial0,115200",
  "console=tty1",
  "root=/dev/mmcblk0p2",
  "rootfstype=ext4",
  "elevator=deadline",
  "fsck.repair=yes",
  "rootwait",
  "quiet",
  "init=/usr/lib/raspi-config/init_resize.sh"
]
 no
boot_config /boot/config.txt

Raspberry Pi system configuration, as a list. Will be joined by newlines.

e.g.:
boot_cmdline = [
    "abc=123",
    "def=456"
]
Will begin /boot/config.txt with:
abc=123
def=456
 list(string) [] no
boot_config_filters /boot/config.txt

Raspberry Pi system conditional filters configuration, as a list.

e.g.:
boot_config_filters = [
    [
        "[pi0]",
        "jhi=123",
        "klm=456"
    ],
    [
        "[pi0w]",
        "xzy",
        "123"
    ],
]
Will end /boot/config.txt with:
[pi0]
jhi=123
klm=456
[pi0w]
xyz
123
 list(list(string)) 
[
  [
    "[pi4]",
    "dtoverlay=vc4-fkms-v3d",
    "max_framebuffers=2"
  ]
]
 no
cloudinit_metadata_file The local path to a cloud-init metadata file.

See the cloud-init NoCloud datasource		 string n/a yes
cloudinit_userdata_file The local path to a cloud-init userdata file.

See the cloud-init NoCloud datasource		 string n/a yes
file_checksum The checksum value of file_url.

See packer-builder-arm.		 string "" no
file_checksum_type The checksum type of file_checksum_url.

See packer-builder-arm.		 string "sha256" no
file_checksum_url The checksum file URL of file_url.

See packer-builder-arm.		 string "" no
file_target_extension The file extension of file_url.

See packer-builder-arm.		 string "zip" no
file_url The URL of the OS image file.

See packer-builder-arm.		 string n/a yes
git_commit The current git commit to pass to the build. It will be prepended to /boot/config.txt

Use on the command-line, i.e. -var "git_commit=$(git rev-parse HEAD)"		 string "" no
git_repo The current git remote to pass to the build. It will be prepended to /boot/config.txt

Use on the command-line, i.e. -var "git_repo=$(git remote get-url origin)" 		string "" no
image_path The file path the new OS image to create. string n/a yes
kernel_modules List of Linux kernel modules to enable, as seen in /etc/modules list(string) [] no
locales List of locales to generate, as seen in /etc/locale.gen. list(string) 
[
  "en_CA.UTF-8 UTF-8",
  "en_US.UTF-8 UTF-8"
]
 no
wpa_supplicant_country The ISO 3166-1 alpha-2 country code in which the device is operating.

Required by the wpa_supplicant.		 string "CA" no
wpa_supplicant_enabled Create a wpa_supplicant.conf file on the image.

If wpa_supplicant_path exists, it will be copied to the OS image, otherwise a basic wpa_supplicant.conf file will be created using wpa_supplicant_ssid, wpa_supplicant_pass and wpa_supplicant_country.		 bool true no
wpa_supplicant_pass The WiFi password. string "" no
wpa_supplicant_path The local path to existing wpa_supplicant.conf to copy to the image. string "/tmp/dummy" no
wpa_supplicant_ssid The WiFi SSID. string "" no