feat: add push-image.sh for publishing the runner image
Publishing this image by hand hit four obstacles in a row, each of which
recurs on every rebuild:
413 Payload Too Large gitea.langenoja.se is behind Cloudflare, which
caps request bodies below a registry layer
Docker Hub auth refusal the bare MagicDNS name was parsed as a Docker Hub
NAMESPACE — a registry host is only recognised
when it contains a dot or a colon
insufficient_scope the PAT needs write:package, not read:package
wrong-arch pulls forgejo-runner runs on arm64 and zegit-runner on
amd64, neither pins a nodeSelector, and both use
this one tag
The image reference must keep the hostname gitea.langenoja.se, because that is
what the cluster pulls. So the script keeps the NAME and changes only the
ROUTE: it pins that hostname to the Istio gateway on the LAN for the duration
of the push. The gateway serves a *.langenoja.se wildcard cert, so TLS
validates normally — no insecure-registries needed.
The pin carries a marker comment, which makes three cases distinguishable: a
leftover from a run that died before its trap fired (reuse, then remove), a
pin the operator added deliberately (never touch), and one pointing somewhere
other than the gateway (refuse to run). Without the marker a leftover pin was
indistinguishable from a deliberate one, so it survived every later run and
had to be reverted by hand. `--unpin` clears a leftover without building, and
the trap covers INT and TERM as well as EXIT.
It also verifies the published manifest really lists two architectures rather
than trusting the push's exit code.
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@@ -37,3 +37,39 @@ reconciles). Do this only *after* the image exists, or the pod ImagePullBackOffs
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`<base-runner-version>-ci` (e.g. `12.11.1-ci`). Must satisfy the cluster's
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Gatekeeper `enforce-semantic-image-tags` constraint — never `:latest`.
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## Publishing a new image
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./push-image.sh 12.11.1-ci4
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The registry hostname in the image reference must stay `gitea.langenoja.se`,
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because that is what the cluster pulls. The script therefore keeps the NAME and
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changes only the ROUTE: it pins that hostname to the Istio gateway on the LAN
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(`10.40.0.10`) for the duration of the push, then removes the pin.
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That matters because `gitea.langenoja.se` resolves to Cloudflare, which caps
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request bodies below a registry layer and returns **413 Payload Too Large**. The
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gateway serves a `*.langenoja.se` wildcard cert, so TLS still validates normally
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— no `insecure-registries`, no `--tls-verify=false`.
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If a run is killed before it can clean up, the pin is left behind. It carries a
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marker comment, so the next run recognises it as its own and removes it — or you
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can clear it directly:
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./push-image.sh --unpin
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A pin you added yourself (no marker) is never touched, and the script refuses to
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run if an unmarked pin points somewhere other than the gateway.
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Requirements: a Gitea PAT with **`write:package`** (`read:package` is pull-only),
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LAN reachability of the gateway, and qemu/binfmt registered for the arm64 build.
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Multi-arch is not optional. `forgejo-runner` runs on arm64 nodes and
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`zegit-runner` on amd64, neither deployment sets a `nodeSelector`, and both use
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this single tag.
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Two traps the script exists to prevent: pushing to the bare MagicDNS name
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(`gitea-system-gitea-tailscale-http`) makes Docker treat it as a **Docker Hub
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namespace**, since a registry host is only recognised when it contains a dot or
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colon; and `docker push $_` pushes `.`, because `$_` is the last ARGUMENT of the
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build command, not its tag.
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Executable
+120
@@ -0,0 +1,120 @@
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#!/usr/bin/env bash
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# push-image.sh — build and publish the runner toolchain image, multi-arch.
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#
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# Why this script exists: doing it by hand hit four obstacles in a row.
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#
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# 1. 413 Payload Too Large. gitea.langenoja.se is behind Cloudflare, which
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# caps request bodies well below a registry layer. Fixed by pinning the
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# hostname to the Istio gateway on the LAN (below) so the push never
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# traverses Cloudflare.
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# 2. Docker only treats a name as a registry HOST if it contains a dot or a
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# colon. Pushing to the bare MagicDNS name `gitea-system-gitea-tailscale-http`
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# was parsed as a Docker Hub NAMESPACE, so Docker Hub refused the auth.
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# 3. The Gitea PAT needs `write:package`. `read:package` is pull-only.
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# 4. Multi-arch is required: forgejo-runner runs on arm64 nodes and
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# zegit-runner on amd64, neither deployment sets a nodeSelector, and both
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# use this one tag.
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#
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# The hostname MUST stay gitea.langenoja.se in the image reference, because that
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# is what the cluster pulls. So we keep the name and change only the ROUTE, via
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# an /etc/hosts pin that is removed again on exit.
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#
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# The Istio gateway serves a *.langenoja.se wildcard cert, so TLS validates
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# normally — no insecure-registries, no --tls-verify=false.
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set -euo pipefail
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TAG="${1:-}"
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GATEWAY_IP="${GATEWAY_IP:-10.40.0.10}"
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REGISTRY="gitea.langenoja.se"
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REPO="$REGISTRY/zegit-zoo/zegit-forgejo-runner"
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MARKER="# added by push-image.sh"
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HOSTS_LINE="$GATEWAY_IP $REGISTRY $MARKER"
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die() { echo "error: $*" >&2; exit 1; }
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if [ "$TAG" = "--unpin" ]; then
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MARKER="# added by push-image.sh"
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if grep -qF "$MARKER" /etc/hosts 2>/dev/null; then
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sudo sed -i "\|${MARKER}\$|d" /etc/hosts; echo "removed the leftover pin"
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else
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echo "no pin of ours in /etc/hosts; nothing to do"
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fi
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exit 0
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fi
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[ -n "$TAG" ] || die "usage: $0 <tag> | --unpin (e.g. $0 12.11.1-ci4)"
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command -v docker >/dev/null || die "docker not on PATH"
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# Three cases, and they must not be confused:
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# OURS — a line carrying our marker. A LEFTOVER from a run that died
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# before its trap fired. Reuse it, and DO remove it on exit.
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# THEIRS — a line without our marker. Deliberate; never touch it, and
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# refuse if it points somewhere other than the gateway.
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# ABSENT — add ours.
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# The earlier version could not tell OURS from THEIRS, so a leftover pin was
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# treated as deliberate and survived every subsequent run. That is the bug that
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# made an operator revert /etc/hosts by hand.
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PIN_OWNED=0
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if grep -qF "$MARKER" /etc/hosts 2>/dev/null; then
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PIN_OWNED=1
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echo "found a leftover pin from an interrupted run; reusing and will clean it up"
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elif grep -qE "^[^#]*[[:space:]]$REGISTRY([[:space:]]|\$)" /etc/hosts 2>/dev/null; then
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existing=$(grep -E "^[^#]*[[:space:]]$REGISTRY([[:space:]]|\$)" /etc/hosts | head -1)
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[ "$(echo "$existing" | awk '{print $1}')" = "$GATEWAY_IP" ] \
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|| die "/etc/hosts already pins $REGISTRY elsewhere (not ours, not the gateway): $existing"
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echo "an unmarked pin to the gateway already exists; leaving it exactly as found"
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fi
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# Removes ONLY lines carrying our marker, so a deliberate pin is never touched.
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unpin() {
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if grep -qF "$MARKER" /etc/hosts 2>/dev/null; then
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sudo sed -i "\|${MARKER}\$|d" /etc/hosts
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echo "removed the /etc/hosts pin"
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fi
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}
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cleanup() { [ "$PIN_OWNED" = "1" ] && unpin; }
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# INT and TERM too: EXIT alone leaves the pin behind on Ctrl-C in some shells.
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trap cleanup EXIT INT TERM
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if [ "$PIN_OWNED" = "0" ] && ! grep -qE "^[^#]*[[:space:]]$REGISTRY([[:space:]]|\$)" /etc/hosts 2>/dev/null; then
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echo "pinning $REGISTRY -> $GATEWAY_IP (bypasses Cloudflare; removed on exit)"
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echo "$HOSTS_LINE" | sudo tee -a /etc/hosts >/dev/null
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PIN_OWNED=1
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fi
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# Prove the route before building anything: 401 means the registry answered and
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# wants auth, which is success here. A timeout means the pin or the LAN is wrong.
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code=$(curl -sS -o /dev/null -w '%{http_code}' --max-time 20 "https://$REGISTRY/v2/" || true)
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case "$code" in
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401|200) echo "registry reachable via the pin (HTTP $code)" ;;
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*) die "registry not reachable via $GATEWAY_IP (HTTP ${code:-timeout}). Is this host on the LAN?" ;;
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esac
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docker login "$REGISTRY" || die "login failed — the PAT needs write:package, not read:package"
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for arch in amd64 arm64; do
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echo "building linux/$arch"
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docker build --platform "linux/$arch" -t "$REPO:$TAG-$arch" . \
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|| die "build failed for $arch (arm64 needs qemu/binfmt registered)"
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# Explicit tag, never $_ — in zsh $_ is the last ARGUMENT, which here is '.'
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docker push "$REPO:$TAG-$arch" || die "push failed for $arch"
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done
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docker manifest rm "$REPO:$TAG" >/dev/null 2>&1 || true
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docker manifest create "$REPO:$TAG" --amend "$REPO:$TAG-amd64" --amend "$REPO:$TAG-arm64"
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docker manifest push "$REPO:$TAG"
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# Verify by reading it back, rather than trusting the push's exit code.
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echo "verifying the published manifest lists both architectures"
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got=$(docker manifest inspect "$REPO:$TAG" | grep -o '"architecture": *"[a-z0-9]*"' | sort -u | wc -l)
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[ "$got" -ge 2 ] || die "published manifest does not list two architectures"
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docker manifest inspect "$REPO:$TAG" | grep -o '"architecture": *"[a-z0-9]*"' | sort -u
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cat <<EOF
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published $REPO:$TAG
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Next, in flux-config, bump BOTH deployments that use this image:
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applications/forgejo-runner/base/deployment-zegit-runner.yaml
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applications/forgejo-runner/base/deployment-forgejo-runner.yaml
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(markus-runner uses markus/gitea-runner and is unaffected.)
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EOF
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