From ce4973094c52904d16cfb31c3cba1b5b1d63ea43 Mon Sep 17 00:00:00 2001
From: chen21019 <chen21019@gmail.com>
Date: Wed, 26 Aug 2026 19:24:41 +0800
Subject: [PATCH] build: pin Ubuntu snapshot sources

---
 Dockerfile.dapper | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/Dockerfile.dapper b/Dockerfile.dapper
index 3ef98b7..f1dcaa7 100644
--- a/Dockerfile.dapper
+++ b/Dockerfile.dapper
@@ -1,10 +1,16 @@
-FROM ubuntu:26.04
+# syntax=docker/dockerfile:1.7
+FROM ubuntu:26.04@sha256:2260313b31c8c011cd2eebe728008efac1b3982be73eb71348ea2648d2c0e09b
 
 ARG DAPPER_HOST_ARCH=amd64
 ARG GO_VERSION=1.27.0
 ARG DOCKER_VERSION=29.7.2
 ARG GO_LINUX_AMD64_SHA256=675c26c449cbb18fc24b74650de1eabbae6e16f64326fd85a283fb3b58280685
 ARG GO_LINUX_ARM64_SHA256=51798d2c42d0e1c6ed7fd9f48728b4193abac9e8aad6dbac2fe96a81f5909bda
+ARG UBUNTU_SNAPSHOT=20260825T000000Z
+
+ADD --checksum=sha256:6077d27c6b6f8b23590cb01ff877ed8c804a67a5442cc32b5a33da10d2bd0e90 \
+    https://snapshot.ubuntu.com/ubuntu/20260825T000000Z/pool/main/c/ca-certificates/ca-certificates_20260601~26.04.1_all.deb \
+    /tmp/ca-certificates.deb
 
 ENV DEBIAN_FRONTEND=noninteractive
 ENV HOST_ARCH=${DAPPER_HOST_ARCH} ARCH=${DAPPER_HOST_ARCH}
@@ -16,7 +22,15 @@ ENV GOPATH=/go \
     GOTELEMETRY=off \
     XDG_CONFIG_HOME=/tmp/go-config
 
-RUN apt-get update && \
+RUN set -eux; \
+    mkdir -p /tmp/ca-bootstrap /etc/ssl/certs; \
+    dpkg-deb --extract /tmp/ca-certificates.deb /tmp/ca-bootstrap; \
+    find /tmp/ca-bootstrap/usr/share/ca-certificates -type f -name '*.crt' | LC_ALL=C sort | while IFS= read -r certificate; do sed -e '$a\' "${certificate}"; done > /etc/ssl/certs/ca-certificates.crt; \
+    rm -rf /tmp/ca-bootstrap /tmp/ca-certificates.deb; \
+    rm -f /etc/apt/sources.list /etc/apt/sources.list.d/*.list /etc/apt/sources.list.d/*.sources; \
+    printf 'Types: deb\nURIs: https://snapshot.ubuntu.com/ubuntu/%s\nSuites: resolute resolute-updates resolute-backports resolute-security\nComponents: main universe restricted multiverse\nSigned-By: /usr/share/keyrings/ubuntu-archive-keyring.gpg\nSnapshot: no\n' "${UBUNTU_SNAPSHOT}" > /etc/apt/sources.list.d/pasturestack-snapshot.sources; \
+    printf 'Acquire::Retries "5";\nAcquire::https::CaInfo "/etc/ssl/certs/ca-certificates.crt";\nAcquire::https::Verify-Peer "true";\nAcquire::https::Verify-Host "true";\nAcquire::AllowInsecureRepositories "false";\nAPT::Get::AllowUnauthenticated "false";\n' > /etc/apt/apt.conf.d/80pasturestack-snapshot; \
+    apt-get update && \
     DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends \
         bash \
         ca-certificates \