fix(agents-login): pin OpenAI auth host to IPv4 so codex sign-in works (musl + broken IPv6)

platform/cluster/flux/apps/agents/agents-login/worker.yaml

@@ -45,6 +45,73 @@ spec:
         fsGroup: 1000
         seccompProfile:
           type: RuntimeDefault
+      # Codex 0.141.x ships a musl static binary. In this cluster IPv6 egress is
+      # unreachable, and musl ignores /etc/gai.conf, so auth.openai.com AAAA
+      # answers can make `codex login --device-auth` fail before it tries IPv4.
+      # Resolve A records at pod startup and mount a pod-local hosts file instead
+      # of using static hostAliases, which would stale when Cloudflare rotates IPs.
+      initContainers:
+        - name: codex-auth-hosts
+          image: ghcr.io/extratoast/personal-stack/agents-login:latest
+          imagePullPolicy: Always
+          command:
+            - node
+            - -e
+            - |
+              const dns = require('node:dns').promises;
+              const { writeFileSync } = require('node:fs');
+
+              const hosts = (process.env.CODEX_IPV4_HOSTS || 'auth.openai.com')
+                .split(/[\s,]+/)
+                .filter(Boolean);
+              const podIp = process.env.POD_IP || '127.0.0.1';
+              const hostname = process.env.HOSTNAME || 'agents-login-worker';
+              const lines = [
+                '# Kubernetes hosts file generated by codex-auth-hosts.',
+                '127.0.0.1\tlocalhost',
+                '::1\tlocalhost ip6-localhost ip6-loopback',
+                'fe00::0\tip6-localnet',
+                'fe00::0\tip6-mcastprefix',
+                'fe00::1\tip6-allnodes',
+                'fe00::2\tip6-allrouters',
+                `${podIp}\t${hostname}`,
+                '',
+              ];
+
+              (async () => {
+                for (const host of hosts) {
+                  const ips = await dns.resolve4(host);
+                  if (ips.length === 0) {
+                    throw new Error(`no A records for ${host}`);
+                  }
+                  for (const ip of ips) {
+                    lines.push(`${ip}\t${host}`);
+                  }
+                  console.log(`resolved ${host}: ${ips.join(', ')}`);
+                }
+                writeFileSync('/generated-hosts/hosts', `${lines.join('\n')}\n`, { mode: 0o644 });
+              })().catch((err) => {
+                console.error(err);
+                process.exit(1);
+              });
+          env:
+            - name: CODEX_IPV4_HOSTS
+              value: auth.openai.com
+            - name: POD_IP
+              valueFrom:
+                fieldRef:
+                  fieldPath: status.podIP
+          securityContext:
+            runAsNonRoot: false
+            runAsUser: 0
+            runAsGroup: 0
+            allowPrivilegeEscalation: false
+            readOnlyRootFilesystem: true
+            capabilities:
+              drop: ['ALL']
+          volumeMounts:
+            - name: codex-auth-hosts
+              mountPath: /generated-hosts
       containers:
         - name: worker
           image: ghcr.io/extratoast/personal-stack/agents-login:latest
@@ -84,6 +151,10 @@ spec:
             capabilities:
               drop: ['ALL']
           volumeMounts:
+            - name: codex-auth-hosts
+              mountPath: /etc/hosts
+              subPath: hosts
+              readOnly: true
             - name: home
               mountPath: /home/agent
             - name: tmp
@@ -106,6 +177,8 @@ spec:
               cpu: 500m
               memory: 512Mi
       volumes:
+        - name: codex-auth-hosts
+          emptyDir: {}
         - name: home
           emptyDir: {}
         - name: tmp

services/agents-login/Dockerfile

@@ -33,12 +33,6 @@ RUN npm install -g \
       @openai/codex@${CODEX_VERSION} \
   && npm cache clean --force
 
-# Prefer IPv4: the cluster has no working IPv6 egress, but external hosts (e.g.
-# auth.openai.com) publish AAAA records. glibc getaddrinfo (used by codex's Rust
-# HTTP client) otherwise returns IPv6 first and codex fails with ENETUNREACH /
-# "error sending request". Ranking IPv4-mapped addresses first makes codex use IPv4.
-RUN printf 'precedence ::ffff:0:0/96  100\n' > /etc/gai.conf
-
 ENV NODE_ENV=production \
     HOME=/home/agent \
     CODEX_HOME=/home/agent/.codex