364 lines
13 KiB
Bash
364 lines
13 KiB
Bash
#!/bin/dash
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# Hetzner Cloud API wrappers for gitea-runner-controller.
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# Requires: HCLOUD_TOKEN_FILE, GCR_HETZNER_LOCATION, GCR_IMAGE_ID,
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# GCR_ACT_RUNNER_VERSION, GCR_ACT_RUNNER_SHA256, GCR_NIX_VERSION,
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# GCR_NIX_TARBALL_SHA256, GCR_GITEA_URL
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# All VMs carry the tag pair gitea-runner-controller=managed plus gcr.* metadata.
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GCR_API="https://api.hetzner.cloud/v1"
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gcr_image_id_for_arch() {
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arch="$1"; label="${2:-}"
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nix_image=0
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case "$label" in nix|gross-nix-*) nix_image=1 ;; esac
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case "$arch:$nix_image" in
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amd64:0) [ -n "${GCR_IMAGE_ID:-}" ] && printf '%s' "$GCR_IMAGE_ID" ;;
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arm64:0) [ -n "${GCR_ARM_IMAGE_ID:-}" ] && printf '%s' "$GCR_ARM_IMAGE_ID" ;;
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amd64:1) [ -n "${GCR_NIX_IMAGE_ID:-}" ] && printf '%s' "$GCR_NIX_IMAGE_ID" ;;
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arm64:1) [ -n "${GCR_ARM_NIX_IMAGE_ID:-}" ] && printf '%s' "$GCR_ARM_NIX_IMAGE_ID" ;;
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*) return 1 ;;
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esac
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}
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gcr_hcloud_token() {
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test -n "${HCLOUD_TOKEN_FILE:-}" && test -r "$HCLOUD_TOKEN_FILE" || {
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gcr_log error --ns=hcloud "HCLOUD_TOKEN_FILE missing or unreadable"
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return 1
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}
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tr -d '\n' < "$HCLOUD_TOKEN_FILE"
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}
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# All request state flows through files/exit codes, never command substitution
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# ($( ) runs in a subshell and would strand GCR_REQ_FAILED/GCR_LAST_HTTP).
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gcr_hcloud_req() {
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# gcr_hcloud_req METHOD PATH [JSON_BODY]
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# Body written to $GCR_LAST_BODY; exit 0 only on HTTP 2xx.
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method="$1"; path="$2"; body="${3:-}"
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token="$(gcr_hcloud_token)" || return 1
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GCR_LAST_BODY="$(mktemp "${TMPDIR:-/tmp}/gcr-resp.XXXXXX")"
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if [ -n "$body" ]; then
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code="$(printf '%s' "$body" | curl -sS -X "$method" \
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-H "Authorization: Bearer $token" \
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-H 'Content-Type: application/json' \
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--data-binary @- \
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-o "$GCR_LAST_BODY" \
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-w '%{http_code}' \
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"$GCR_API$path")"
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else
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code="$(curl -sS -X "$method" \
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-H "Authorization: Bearer $token" \
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-o "$GCR_LAST_BODY" \
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-w '%{http_code}' \
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"$GCR_API$path")"
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fi
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case "$code" in 2??) return 0 ;; esac
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gcr_log warn --ns=hcloud "request failed path=$path http=$code body=$(head -c 200 "$GCR_LAST_BODY" | gcr_redact)"
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return 1
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}
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gcr_vm_list_managed() {
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if gcr_hcloud_req GET "/servers?label_selector=gitea-runner-controller%3Dmanaged&per_page=50"; then
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jq -S '.servers' "$GCR_LAST_BODY"
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fi
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}
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gcr_vm_build_userdata() {
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vm_name="$1"; label="$2"; reg_token="$3"
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nix_conf='accept-flake-config = true
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experimental-features = nix-command flakes
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substituters = https://cache.nixos.org https://cache.hectic-lab.com/hectic
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trusted-public-keys = cache.nixos.org-1:6NCHdD59X431o0gW4x6l1xP+GxgH0r7u+f6p1VFlr0= hectic:KMQsKow4SoA9K2vOJlOljmx7/Zpf91Yy+5qEtxDDCzA=
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sandbox = false'
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runner_config="log:
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level: info
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runner:
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file: /var/lib/gitea-runner/.runner
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capacity: 1
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timeout: $(printf '%s' "$(gcr_label_profile "$label")" | awk '{print $2}')m
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insecure: false
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fetch_timeout: 5s
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fetch_interval: 2s
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labels:
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- \"$label:host\""
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ssh_key_block=""
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if [ -n "${GCR_DEBUG_SSH_PUBKEY:-}" ]; then
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ssh_key_block=" - path: /root/.ssh/authorized_keys
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permissions: '0600'
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content: |
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$GCR_DEBUG_SSH_PUBKEY"
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fi
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# NOTE(yukkop): token reaches only this VM's Hetzner metadata service;
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# ephemeral registration makes it useless after the single job exits.
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printf '%s' "#cloud-config
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write_files:
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$ssh_key_block
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- path: /etc/ssh/sshd_config.d/99-gcr-root.conf
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permissions: '0644'
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content: |
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PermitRootLogin prohibit-password
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PubkeyAuthentication yes
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- path: /etc/nix/nix.conf
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content: |
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$(printf '%s\n' "$nix_conf" | sed 's/^/ /')
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- path: /etc/gitea-runner/config.yaml
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content: |
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$(printf '%s\n' "$runner_config" | sed 's/^/ /')
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- path: /etc/systemd/system/gitea-runner.service
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content: |
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[Unit]
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Description=Gitea ephemeral Actions runner
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After=network-online.target gcr-bootstrap.service
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Requires=gcr-bootstrap.service
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[Service]
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Type=simple
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Environment=GITEA_INSTANCE_URL=$GCR_GITEA_URL
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Environment=GITEA_RUNNER_REGISTRATION_TOKEN=$reg_token
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ExecStart=/usr/local/bin/act_runner daemon --ephemeral --config /etc/gitea-runner/config.yaml
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Restart=on-failure
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RestartSec=5
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[Install]
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WantedBy=multi-user.target
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- path: /etc/systemd/system/gcr-bootstrap.service
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content: |
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[Unit]
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Description=Bootstrap gitea-runner for ephemeral CI job
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After=network-online.target
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Wants=network-online.target
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Before=gitea-runner.service
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[Service]
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Type=oneshot
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RemainAfterExit=true
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ExecStart=/usr/local/sbin/gcr-bootstrap
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[Install]
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WantedBy=multi-user.target
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- path: /usr/local/sbin/gcr-bootstrap
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permissions: '0700'
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content: |
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#!/bin/sh
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set -eu
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exec > /var/log/gcr-bootstrap.log 2>&1
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curl -fsSL \"https://nixos.org/releases/nix/$GCR_NIX_VERSION/nix-$GCR_NIX_VERSION-x86_64-linux.tar.xz\" -o /tmp/nix.tar.xz
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printf '%s /tmp/nix.tar.xz\n' \"$GCR_NIX_TARBALL_SHA256\" | sha256sum -c -
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tar -xJf /tmp/nix.tar.xz -C /tmp
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/tmp/nix-$GCR_NIX_VERSION-x86_64-linux/install --no-daemon
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rm -rf /tmp/nix*
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curl -fsSL \"https://dl.gitea.com/gitea-runner/$GCR_ACT_RUNNER_VERSION/gitea-runner-$GCR_ACT_RUNNER_VERSION-linux-amd64\" -o /usr/local/bin/gitea-runner
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printf '%s /usr/local/bin/gitea-runner\n' \"$GCR_ACT_RUNNER_SHA256\" | sha256sum -c -
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chmod 0755 /usr/local/bin/gitea-runner
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mkdir -p /var/lib/gitea-runner
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runcmd:
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- [ sh, -c, 'systemctl enable --now sshd.service 2>/dev/null || systemctl enable --now ssh 2>/dev/null || true' ]
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- [ sh, -c, 'systemctl restart sshd.service 2>/dev/null || systemctl restart ssh 2>/dev/null || true' ]
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- [ systemctl, enable, --now, gitea-runner.service ]
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"
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}
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# gcr_vm_create NAME LABEL SERVER_TYPE TTL_MIN REG_TOKEN JOB_ID ATTEMPT REPO
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# Prints new server id.
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gcr_vm_create() {
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vm_name="$1"; label="$2"; server_type="$3"; ttl_min="$4"
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reg_token="$5"; job_id="$6"; attempt="$7"; repo="$8"
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ttl_min="$(gcr_label_ttl "$label")" || return 1
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candidates="$(gcr_label_candidates "$label")" || return 1
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candidate_n=0
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while read -r candidate_type candidate_loc candidate_arch; do
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[ -n "${candidate_type:-}" ] || continue
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candidate_n=$((candidate_n + 1))
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image_id="$(gcr_image_id_for_arch "$candidate_arch" "$label")" || {
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gcr_log warn --ns=hcloud "skip candidate[$candidate_n] label=$label arch=$candidate_arch no image"
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continue
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}
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payload="$(jq -n \
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--arg name "$vm_name" \
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--arg stype "$candidate_type" \
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--arg image "$image_id" \
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--arg loc "$candidate_loc" \
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--arg jid "$job_id" \
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--arg att "$attempt" \
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--arg repo "$repo" \
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--arg label "$label" \
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--arg arch "$candidate_arch" \
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--arg ts "$(date -u '+%s')" \
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--arg ttl "$ttl_min" \
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--arg repo_safe "$(printf '%s' "$repo" | tr '/:' '--')" \
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'{name:$name, server_type:$stype, image:$image, location:$loc,
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start_after_create:true,
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labels:{
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"gitea-runner-controller":"managed",
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"gcr.job-id":$jid, "gcr.run-attempt":$att,
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"gcr.repo":$repo_safe, "gcr.label":$label,
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"gcr.arch":$arch, "gcr.location":$loc,
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"gcr.created-at":$ts, "gcr.ttl-min":$ttl}}')"
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gcr_log info --ns=hcloud "try candidate[$candidate_n] label=$label type=$candidate_type arch=$candidate_arch loc=$candidate_loc"
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if gcr_hcloud_req POST /servers "$payload"; then
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jq -r '.server.id' "$GCR_LAST_BODY"
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return 0
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fi
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if [ "$candidate_n" -le 3 ]; then
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sleep 5
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else
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sleep 1
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fi
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done <<EOF
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$candidates
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EOF
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return 1
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}
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# gcr_vm_destroy SERVER_ID — idempotent best-effort destroy.
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gcr_vm_destroy() {
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if ! gcr_hcloud_req DELETE "/servers/$1"; then
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gcr_log warn --ns=hcloud "destroy failed or already gone: server $1"
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return 1
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fi
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}
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# Bootstrap delivery is SSH-push from the controller. The MicroOS snapshot's
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# cloud-init cannot fetch user-data (Hetzner datasource DHCP failure), so the
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# controller drives provisioning over SSH using GCR_SSH_PRIVKEY_FILE, whose
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# public half is authorized on every ephemeral VM (project ssh-key injection).
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gcr_bootstrap_script() {
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# gcr_bootstrap_script LABEL REG_TOKEN TTL_MIN RUNNER_NAME -> POSIX sh payload
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label="$1"; reg_token="$2"; ttl_min="$3"; runner_name="$4"
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nix_conf='accept-flake-config = true
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experimental-features = nix-command flakes
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substituters = https://cache.nixos.org https://cache.hectic-lab.com/hectic
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trusted-public-keys = cache.nixos.org-1:6NCHdD59X431o0gW4x6l1xP+GxgH0r7u+f6p1VFlr0= hectic:KMQsKow4SoA9K2vOJlOljmx7/Zpf91Yy+5qEtxDDCzA=
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sandbox = false'
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runner_config="log:
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level: info
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runner:
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file: /var/lib/gitea-runner/.runner
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capacity: 1
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timeout: ${ttl_min}m
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insecure: false
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fetch_timeout: 5s
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fetch_interval: 2s
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labels:
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- \"$label:host\""
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cat <<BSEOF
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exec >/var/log/gcr-bootstrap.log 2>&1
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set -eu
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mkdir -p /etc/nix /etc/gitea-runner /var/lib/gitea-runner /usr/local/bin
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cat > /etc/nix/nix.conf <<'NIXEOF'
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$nix_conf
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NIXEOF
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cat > /etc/gitea-runner/config.yaml <<'CFGEOF'
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$runner_config
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CFGEOF
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cat > /usr/local/sbin/gcr-runner-start <<STARTEOF
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#!/bin/sh
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set -eu
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if [ ! -f /var/lib/gitea-runner/.runner ]; then
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/usr/local/bin/gitea-runner register --no-interactive --instance $GCR_GITEA_URL --token $reg_token --name $runner_name --labels $label:host --config /etc/gitea-runner/config.yaml
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fi
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exec /usr/local/bin/gitea-runner daemon --config /etc/gitea-runner/config.yaml
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STARTEOF
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chmod 0700 /usr/local/sbin/gcr-runner-start
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cat > /etc/systemd/system/gitea-runner.service <<UNITEOF
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[Unit]
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Description=Gitea ephemeral Actions runner
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After=network-online.target
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[Service]
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Type=simple
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WorkingDirectory=/var/lib/gitea-runner
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Environment=HOME=/var/lib/gitea-runner
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ExecStart=/usr/local/sbin/gcr-runner-start
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Restart=on-failure
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RestartSec=5
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[Install]
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WantedBy=multi-user.target
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UNITEOF
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cat > /usr/local/sbin/gcr-install <<INSEOF
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#!/bin/sh
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set -eu
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case "$label" in
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nix|gross-nix-x86|gross-nix-arm|gross-nix-x86-perf|gross-nix-mixed-econ)
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nix_arch=""
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nix_sha=""
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case "\$(uname -m)" in
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x86_64)
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nix_arch=x86_64-linux
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nix_sha="$GCR_NIX_TARBALL_SHA256"
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;;
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aarch64|arm64)
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nix_arch=aarch64-linux
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nix_sha="$GCR_ARM_NIX_TARBALL_SHA256"
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;;
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*)
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echo "unsupported arch for Nix bootstrap: $(uname -m)" >&2
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exit 1
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;;
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esac
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curl -fsSL "https://releases.nixos.org/nix/nix-$GCR_NIX_VERSION/nix-$GCR_NIX_VERSION-\$nix_arch.tar.xz" -o /tmp/nix.tar.xz
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printf '%s /tmp/nix.tar.xz\n' "\$nix_sha" | sha256sum -c -
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tar -xJf /tmp/nix.tar.xz -C /tmp
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/tmp/nix-$GCR_NIX_VERSION-\$nix_arch/install --no-daemon
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rm -rf /tmp/nix*
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;;
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esac
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case "\$(uname -m)" in
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x86_64) runner_arch=amd64 ;;
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aarch64|arm64) runner_arch=arm64 ;;
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*) echo "unsupported arch for runner bootstrap: \$(uname -m)" >&2; exit 1 ;;
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esac
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curl -fsSL "https://dl.gitea.com/gitea-runner/$GCR_ACT_RUNNER_VERSION/gitea-runner-$GCR_ACT_RUNNER_VERSION-linux-\$runner_arch" -o /usr/local/bin/gitea-runner
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if [ "\$runner_arch" = amd64 ]; then
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printf '%s /usr/local/bin/gitea-runner\n' "$GCR_ACT_RUNNER_SHA256" | sha256sum -c -
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fi
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chmod 0755 /usr/local/bin/gitea-runner
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INSEOF
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chmod 0700 /usr/local/sbin/gcr-install
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/usr/local/sbin/gcr-install
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systemctl daemon-reload
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systemctl enable --now gitea-runner.service
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BSEOF
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}
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# gcr_vm_bootstrap_ssh IP LABEL REG_TOKEN — blocking; returns ssh exit status.
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gcr_vm_bootstrap_ssh() {
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ip="$1"; label="$2"; reg_token="$3"; runner_name="$4"
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test -n "${GCR_SSH_PRIVKEY_FILE:-}" && test -r "$GCR_SSH_PRIVKEY_FILE" || {
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gcr_log error --ns=hcloud "GCR_SSH_PRIVKEY_FILE missing or unreadable"
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return 1
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}
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key_tmp="$(mktemp "${TMPDIR:-/tmp}/gcr-sshkey.XXXXXX")"
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cat "$GCR_SSH_PRIVKEY_FILE" > "$key_tmp"
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printf '\n' >> "$key_tmp"
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chmod 0600 "$key_tmp"
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SSH_OPTS="-i $key_tmp -o IdentitiesOnly=yes -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null -o ConnectTimeout=5 -o BatchMode=yes"
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waited=0
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until ssh $SSH_OPTS "root@$ip" true 2>/dev/null; do
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waited=$((waited + 5))
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[ "$waited" -ge 900 ] && {
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gcr_log warn --ns=hcloud "sshd never came up on $ip"
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rm -f "$key_tmp"
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return 1
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}
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sleep 5
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done
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ttl_min="$(printf '%s' "$(gcr_label_profile "$label")" | awk '{print $2}')"
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script="$(gcr_bootstrap_script "$label" "$reg_token" "$ttl_min" "$runner_name")"
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if printf '%s' "$script" | ssh $SSH_OPTS "root@$ip" sh -s; then
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rm -f "$key_tmp"
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return 0
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fi
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rm -f "$key_tmp"
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return 1
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}
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