refactor(incus-vm): split NixOS provisioning into nixos.tf
Move local.is_nixos and null_resource.provision_nixos out of main.tf into a dedicated nixos.tf to keep main.tf focused on core infrastructure.
This commit is contained in:
Ben Potter
parent
cd76e01fa2
commit
a262565650
@ -208,8 +208,6 @@ resource "incus_image" "image" {
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remote = local.incus_remote
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source_image = {
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remote = "images"
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# NixOS images on images.linuxcontainers.org use just "nixos/25.11" (no arch suffix in alias).
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# Other distros like ubuntu append the arch: "ubuntu/jammy/cloud/amd64".
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name = local.is_nixos ? data.coder_parameter.image.value : "${data.coder_parameter.image.value}/${data.coder_parameter.host.value == "ThinkStation" ? "amd64" : "arm64"}"
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type = "virtual-machine"
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architecture = data.coder_parameter.host.value == "ThinkStation" ? "x86_64" : "aarch64"
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@ -357,112 +355,6 @@ resource "null_resource" "token_refresh" {
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}
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}
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# Provisioner for NixOS VMs.
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# NixOS does not support cloud-init in the traditional sense.
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# We use incus file push + nixos-rebuild to declare the user and coder-agent service.
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resource "null_resource" "provision_nixos" {
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count = data.coder_workspace.me.start_count == 1 && local.is_nixos ? 1 : 0
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triggers = {
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agent_token = local.agent_token
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instance = incus_instance.dev.name
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}
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depends_on = [incus_instance.dev]
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provisioner "local-exec" {
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# Write the nix module and coder agent files into the VM, then run nixos-rebuild.
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# We use incus file push for files containing sensitive values or complex content,
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# and incus exec for commands. This avoids shell quoting issues with heredocs.
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command = <<-EOT
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set -e
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REMOTE="${local.incus_remote}"
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INSTANCE="${incus_instance.dev.name}"
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WUSER="${local.workspace_user}"
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ARCH="${data.coder_parameter.host.value == "ThinkStation" ? "amd64" : "arm64"}"
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echo "Waiting for NixOS VM incus-agent to be ready..."
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for i in $(seq 1 60); do
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if incus exec "$REMOTE:$INSTANCE" -- true 2>/dev/null; then
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echo "incus-agent ready after $i attempts"
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break
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fi
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echo "Attempt $i: incus-agent not ready yet, waiting..."
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sleep 5
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done
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# Write init script into the VM
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incus exec "$REMOTE:$INSTANCE" -- mkdir -p /opt/coder
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echo "${base64encode(local.agent_init_script)}" | base64 -d | incus file push - "$REMOTE:$INSTANCE/opt/coder/init"
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incus exec "$REMOTE:$INSTANCE" -- chmod 755 /opt/coder/init
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# Write env file into the VM
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printf 'CODER_AGENT_TOKEN=${local.agent_token}\nCODER_AGENT_URL=${data.coder_workspace.me.access_url}\n' \
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| incus file push - "$REMOTE:$INSTANCE/opt/coder/init.env" --mode 0600
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# Write the NixOS coder module, substituting the username
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NIXMOD=$(cat <<NIXMOD_EOF
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{ config, pkgs, lib, ... }:
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{
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users.users."$WUSER" = {
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isNormalUser = true;
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uid = 1000;
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home = "/home/$WUSER";
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shell = pkgs.bash;
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extraGroups = [ "wheel" ];
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};
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security.sudo.wheelNeedsPassword = false;
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systemd.services.coder-agent = {
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description = "Coder Agent";
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after = [ "network-online.target" ];
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wants = [ "network-online.target" ];
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wantedBy = [ "multi-user.target" ];
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serviceConfig = {
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User = "$WUSER";
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EnvironmentFile = "/opt/coder/init.env";
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ExecStart = "/opt/coder/init";
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Environment = "PATH=/run/current-system/sw/bin:/run/wrappers/bin:/usr/local/bin:/usr/bin:/bin";
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Restart = "always";
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RestartSec = 10;
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TimeoutStopSec = 90;
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KillMode = "process";
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OOMScoreAdjust = -900;
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SyslogIdentifier = "coder-agent";
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};
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};
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}
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NIXMOD_EOF
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)
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echo "$NIXMOD" | incus file push - "$REMOTE:$INSTANCE/etc/nixos/coder.nix"
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# Patch configuration.nix to import coder.nix if not already imported
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incus exec "$REMOTE:$INSTANCE" -- \
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env PATH=/run/current-system/sw/bin /run/current-system/sw/bin/bash -c \
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"grep -q coder.nix /etc/nixos/configuration.nix || \
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sed -i 's|imports = \[|imports = [\n ./coder.nix|' /etc/nixos/configuration.nix"
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echo "Running nixos-rebuild switch (this may take a few minutes)..."
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incus exec "$REMOTE:$INSTANCE" -- \
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env PATH=/run/current-system/sw/bin /run/current-system/sw/bin/bash -l -c \
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"nixos-rebuild switch; EC=\$?; [ \$EC -eq 0 ] || [ \$EC -eq 4 ] || exit \$EC"
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echo "Restarting coder-agent service..."
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incus exec "$REMOTE:$INSTANCE" -- \
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env PATH=/run/current-system/sw/bin /run/current-system/sw/bin/bash -c \
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"systemctl daemon-reload; systemctl restart coder-agent.service; sleep 3; systemctl status coder-agent.service || true"
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# Ensure home dir ownership (nixos-rebuild will have created the user home)
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incus exec "$REMOTE:$INSTANCE" -- \
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env PATH=/run/current-system/sw/bin /run/current-system/sw/bin/bash -c \
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"mkdir -p /home/$WUSER && chown 1000:1000 /home/$WUSER && chmod 755 /home/$WUSER"
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echo "NixOS provisioning complete."
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EOT
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}
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}
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resource "incus_instance_snapshot" "on_stop" {
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count = data.coder_parameter.snapshot_on_stop.value == "true" ? 1 : 0
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remote = local.incus_remote
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@ -483,9 +375,6 @@ locals {
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agent_token = data.coder_workspace.me.start_count == 1 ? coder_agent.main[0].token : ""
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agent_init_script = data.coder_workspace.me.start_count == 1 ? coder_agent.main[0].init_script : ""
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# Detect NixOS image
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is_nixos = startswith(data.coder_parameter.image.value, "nixos/")
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# USB device map — add more entries here as needed
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usb_devices = {
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kindle = { name = "kindle", vendorid = "1949", productid = "0004" }
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117
registry/bpmct/templates/incus-vm/nixos.tf
Normal file
117
registry/bpmct/templates/incus-vm/nixos.tf
Normal file
@ -0,0 +1,117 @@
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# NixOS-specific provisioning for incus-vm workspaces.
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#
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# NixOS doesn't support cloud-init, so instead we:
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# 1. Push the coder agent init script and env file via incus file push
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# 2. Generate /etc/nixos/coder.nix declaring the user + coder-agent service
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# 3. Patch configuration.nix to import coder.nix
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# 4. Run nixos-rebuild switch
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# 5. Restart coder-agent.service with the fresh token
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#
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# This provisioner runs on every workspace start (null_resource is recreated
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# each cycle), which also handles token rotation.
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locals {
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# NixOS images on images.linuxcontainers.org use just "nixos/25.11" with no
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# arch suffix in the alias — unlike Ubuntu which appends e.g. "/amd64".
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is_nixos = startswith(data.coder_parameter.image.value, "nixos/")
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}
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resource "null_resource" "provision_nixos" {
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count = data.coder_workspace.me.start_count == 1 && local.is_nixos ? 1 : 0
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triggers = {
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agent_token = local.agent_token
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instance = incus_instance.dev.name
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}
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depends_on = [incus_instance.dev]
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provisioner "local-exec" {
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command = <<-EOT
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set -e
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REMOTE="${local.incus_remote}"
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INSTANCE="${incus_instance.dev.name}"
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WUSER="${local.workspace_user}"
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ARCH="${data.coder_parameter.host.value == "ThinkStation" ? "amd64" : "arm64"}"
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echo "Waiting for NixOS VM incus-agent to be ready..."
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for i in $(seq 1 60); do
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if incus exec "$REMOTE:$INSTANCE" -- true 2>/dev/null; then
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echo "incus-agent ready after $i attempts"
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break
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fi
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echo "Attempt $i: incus-agent not ready yet, waiting..."
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sleep 5
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done
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# Write init script into the VM
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incus exec "$REMOTE:$INSTANCE" -- mkdir -p /opt/coder
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echo "${base64encode(local.agent_init_script)}" | base64 -d | incus file push - "$REMOTE:$INSTANCE/opt/coder/init"
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incus exec "$REMOTE:$INSTANCE" -- chmod 755 /opt/coder/init
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# Write env file into the VM
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printf 'CODER_AGENT_TOKEN=${local.agent_token}\nCODER_AGENT_URL=${data.coder_workspace.me.access_url}\n' \
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| incus file push - "$REMOTE:$INSTANCE/opt/coder/init.env" --mode 0600
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# Write the NixOS coder module, substituting the username
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NIXMOD=$(cat <<NIXMOD_EOF
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{ config, pkgs, lib, ... }:
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{
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users.users."$WUSER" = {
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isNormalUser = true;
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uid = 1000;
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home = "/home/$WUSER";
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shell = pkgs.bash;
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extraGroups = [ "wheel" ];
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};
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security.sudo.wheelNeedsPassword = false;
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systemd.services.coder-agent = {
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description = "Coder Agent";
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after = [ "network-online.target" ];
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wants = [ "network-online.target" ];
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wantedBy = [ "multi-user.target" ];
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serviceConfig = {
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User = "$WUSER";
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EnvironmentFile = "/opt/coder/init.env";
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ExecStart = "/opt/coder/init";
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Environment = "PATH=/run/current-system/sw/bin:/run/wrappers/bin:/usr/local/bin:/usr/bin:/bin";
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Restart = "always";
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RestartSec = 10;
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TimeoutStopSec = 90;
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KillMode = "process";
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OOMScoreAdjust = -900;
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SyslogIdentifier = "coder-agent";
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};
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};
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}
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NIXMOD_EOF
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)
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echo "$NIXMOD" | incus file push - "$REMOTE:$INSTANCE/etc/nixos/coder.nix"
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# Patch configuration.nix to import coder.nix if not already imported
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incus exec "$REMOTE:$INSTANCE" -- \
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env PATH=/run/current-system/sw/bin /run/current-system/sw/bin/bash -c \
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"grep -q coder.nix /etc/nixos/configuration.nix || \
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sed -i 's|imports = \[|imports = [\n ./coder.nix|' /etc/nixos/configuration.nix"
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echo "Running nixos-rebuild switch (this may take a few minutes)..."
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incus exec "$REMOTE:$INSTANCE" -- \
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env PATH=/run/current-system/sw/bin /run/current-system/sw/bin/bash -l -c \
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"nixos-rebuild switch; EC=\$?; [ \$EC -eq 0 ] || [ \$EC -eq 4 ] || exit \$EC"
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echo "Restarting coder-agent service..."
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incus exec "$REMOTE:$INSTANCE" -- \
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env PATH=/run/current-system/sw/bin /run/current-system/sw/bin/bash -c \
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"systemctl daemon-reload; systemctl restart coder-agent.service; sleep 3; systemctl status coder-agent.service || true"
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# Ensure home dir ownership (nixos-rebuild will have created the user home)
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incus exec "$REMOTE:$INSTANCE" -- \
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env PATH=/run/current-system/sw/bin /run/current-system/sw/bin/bash -c \
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"mkdir -p /home/$WUSER && chown 1000:1000 /home/$WUSER && chmod 755 /home/$WUSER"
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echo "NixOS provisioning complete."
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EOT
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}
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}
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