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#!/usr/bin/env bash
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# SPDX-License-Identifier: GPL-2.0-or-later
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# Copyright (C) 2026 Bryan Joshua Pedini
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# apt.sh - APT e2e fixture for skeptical-updater (Debian/Ubuntu containers).
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# Copy of discovery/apt/fixture.sh; the only changes are the SU_FIXTURE_STRICT_DEP knob
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# (su-dummy-a 2.0 depends on plain su-dummy-b by default, like the pacman and rpm
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# fixtures, so excluding su-dummy-b does not keep su-dummy-a back), SU_FIXTURE_ORPHAN and
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# SU_FIXTURE_B_AUTO.
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#
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# Builds a local *flat* APT repository at /srv/su-repo containing dummy packages
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# and installs the old (1.0) versions, so that after `apt-get update` the package
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# manager reports deterministic upgrades:
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#
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# su-dummy-a 1.0 -> 2.0 (Depends: su-dummy-b, ships a conffile;
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# SU_FIXTURE_STRICT_DEP=1: 2.0 Depends: su-dummy-b (>= 2.0))
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# su-dummy-b 1.0 -> 2.0 (dependency of su-dummy-a)
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# su-dummy-c 1.0 -> 2.0 (standalone)
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#
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# Optional extras (SU_FIXTURE_EXTRA=1) for "kept back" / removal / virtual-package
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# scenarios:
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# su-dummy-d 1.0 -> 2.0 2.0 adds a NEW dependency (su-dummy-newdep, not installed)
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# => plain `upgrade` keeps it back, `--with-new-pkgs upgrade`
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# and `dist-upgrade` install it
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# su-dummy-e 1.0 -> 2.0 2.0 Conflicts: su-dummy-f (installed, no 2.0 exists)
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# => only `dist-upgrade` can do it (removes su-dummy-f) - except with apt 3.x
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# solver3 (ubuntu:latest = 26.04) which refuses to remove the manually
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# installed su-dummy-f and keeps su-dummy-e back even for dist-upgrade
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# su-dummy-f 1.0 installed, never upgradable
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# su-dummy-w 1.0 -> 2.0 Depends: su-virtual | su-dummy-alt (virtual + alternative)
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# su-dummy-v 1.0 Provides: su-virtual
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# (+ su-dummy-newdep 1.0 and su-dummy-alt 1.0: only in the repo, never pre-installed)
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#
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# Environment knobs (all optional):
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# SU_REPO_DIR=/srv/su-repo where the repo is created (wiped first; must match /srv/su-*, /tmp/su-*, /var/tmp/su-*)
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# SU_OLD_DIR=/srv/su-old where the 1.0 .debs are kept (NOT in the repo)
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# SU_FIXTURE_INDEXER=shell shell | scanpackages | ftparchive
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# shell = no extra tools needed (dpkg-deb -f + sha256sum)
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# scanpackages = dpkg-scanpackages (installs dpkg-dev if missing)
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# ftparchive = apt-ftparchive (installs apt-utils if missing)
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# SU_FIXTURE_OFFLINE=1 disable the distro's real sources (hermetic: no network at all)
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# SU_FIXTURE_EXTRA=1 add the extra scenario packages listed above
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# SU_FIXTURE_BAD=1 add su-dummy-bad: 1.0 installed, 2.0 has a postinst that fails
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# (apt-get upgrade then exits 100) - for error-path tests
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# SU_FIXTURE_STRICT_DEP=1 su-dummy-a 2.0 depends on "su-dummy-b (>= 2.0)" (as in discovery/apt):
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# holding su-dummy-b then also keeps su-dummy-a back
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# SU_FIXTURE_ORPHAN=1 also install su-dummy-orphan 1.0 marked automatically installed with
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# nothing depending on it (a pre-existing autoremove candidate)
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# SU_FIXTURE_B_AUTO=1 mark su-dummy-b automatically installed (a dependency of su-dummy-a,
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# like the pacman fixture's --asdeps)
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#
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# Must run as root inside a throwaway container, e.g.:
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# docker run --rm -i -v "$PWD/discovery/apt:/d:ro" debian:12 bash /d/fixture.sh
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set -euo pipefail
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export LC_ALL=C DEBIAN_FRONTEND=noninteractive
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REPO_DIR=${SU_REPO_DIR:-/srv/su-repo}
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OLD_DIR=${SU_OLD_DIR:-/srv/su-old}
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INDEXER=${SU_FIXTURE_INDEXER:-shell}
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OFFLINE=${SU_FIXTURE_OFFLINE:-0}
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EXTRA=${SU_FIXTURE_EXTRA:-0}
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BAD=${SU_FIXTURE_BAD:-0}
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STRICT_DEP=${SU_FIXTURE_STRICT_DEP:-0}
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ORPHAN=${SU_FIXTURE_ORPHAN:-0}
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B_AUTO=${SU_FIXTURE_B_AUTO:-0}
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SOURCES_FILE=/etc/apt/sources.list.d/su-repo.list
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T0=$(date +%s)
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log() { printf '[fixture] %s\n' "$*"; }
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die() { printf '[fixture] ERROR: %s\n' "$*" >&2; exit 1; }
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[ "$(id -u)" -eq 0 ] || die "must run as root"
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command -v apt-get >/dev/null || die "apt-get not found (not a Debian/Ubuntu image?)"
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command -v dpkg-deb >/dev/null || die "dpkg-deb not found"
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case $INDEXER in shell|scanpackages|ftparchive) ;; *) die "bad SU_FIXTURE_INDEXER=$INDEXER" ;; esac
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# the directories are wiped with rm -rf: only accept obviously fixture-owned locations
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for d in "$REPO_DIR" "$OLD_DIR"; do
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case $d in /srv/su-*|/tmp/su-*|/var/tmp/su-*) ;; *) die "refusing to wipe '$d' (must match /srv/su-*, /tmp/su-* or /var/tmp/su-*)" ;; esac
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done
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# ---------------------------------------------------------------- build debs
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# mkdeb NAME VERSION OUTDIR [extra control line]...
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# If $MKDEB_POSTINST is set it becomes the body of the package's postinst script.
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mkdeb() {
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local name=$1 ver=$2 out=$3 root line
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shift 3
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root=$(mktemp -d)
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mkdir -p "$root/DEBIAN" "$root/usr/share/su-dummy" "$root/etc/su-dummy"
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{
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printf 'Package: %s\nVersion: %s\nSection: misc\nPriority: optional\n' "$name" "$ver"
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printf 'Architecture: all\nMaintainer: Skeptical Updater Fixture <su-fixture@example.invalid>\n'
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for line in "$@"; do printf '%s\n' "$line"; done
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printf 'Description: dummy package %s for skeptical-updater tests\n' "$name"
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printf ' This package only exists to exercise the package manager.\n'
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printf ' .\n'
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printf ' It ships one data file and one conffile (version %s).\n' "$ver"
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} > "$root/DEBIAN/control"
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echo "$ver" > "$root/usr/share/su-dummy/$name"
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echo "version=$ver" > "$root/etc/su-dummy/$name.conf"
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echo "/etc/su-dummy/$name.conf" > "$root/DEBIAN/conffiles"
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if [ -n "${MKDEB_POSTINST:-}" ]; then
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printf '#!/bin/sh\n%s\n' "$MKDEB_POSTINST" > "$root/DEBIAN/postinst"
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chmod 755 "$root/DEBIAN/postinst"
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fi
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mkdir -p "$out"
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# -Zgzip: readable by every dpkg in the supported images; --root-owner-group: files owned by root
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dpkg-deb --root-owner-group -Zgzip --build "$root" "$out/${name}_${ver}_all.deb" >/dev/null
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rm -rf "$root"
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}
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rm -rf "$REPO_DIR" "$OLD_DIR"
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mkdir -p "$REPO_DIR" "$OLD_DIR"
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# old versions (installed straight away with dpkg, NOT published in the repo)
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mkdeb su-dummy-a 1.0 "$OLD_DIR" 'Depends: su-dummy-b'
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mkdeb su-dummy-b 1.0 "$OLD_DIR"
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mkdeb su-dummy-c 1.0 "$OLD_DIR"
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# new versions (published in the repo)
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if [ "$STRICT_DEP" = 1 ]; then
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mkdeb su-dummy-a 2.0 "$REPO_DIR" 'Depends: su-dummy-b (>= 2.0)'
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else
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mkdeb su-dummy-a 2.0 "$REPO_DIR" 'Depends: su-dummy-b'
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fi
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mkdeb su-dummy-b 2.0 "$REPO_DIR"
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mkdeb su-dummy-c 2.0 "$REPO_DIR"
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if [ "$ORPHAN" = 1 ]; then
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mkdeb su-dummy-orphan 1.0 "$OLD_DIR" # installed, never upgradable
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fi
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if [ "$EXTRA" = 1 ]; then
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mkdeb su-dummy-d 1.0 "$OLD_DIR"
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mkdeb su-dummy-d 2.0 "$REPO_DIR" 'Depends: su-dummy-newdep'
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mkdeb su-dummy-newdep 1.0 "$REPO_DIR" # only in the repo, never pre-installed
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mkdeb su-dummy-e 1.0 "$OLD_DIR"
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mkdeb su-dummy-e 2.0 "$REPO_DIR" 'Conflicts: su-dummy-f'
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mkdeb su-dummy-f 1.0 "$OLD_DIR"
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mkdeb su-dummy-v 1.0 "$OLD_DIR" 'Provides: su-virtual'
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mkdeb su-dummy-alt 1.0 "$REPO_DIR" # alternative target, not installed
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mkdeb su-dummy-w 1.0 "$OLD_DIR" 'Depends: su-virtual | su-dummy-alt'
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mkdeb su-dummy-w 2.0 "$REPO_DIR" 'Depends: su-virtual | su-dummy-alt'
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fi
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if [ "$BAD" = 1 ]; then
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mkdeb su-dummy-bad 1.0 "$OLD_DIR"
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# shellcheck disable=SC2016 # the postinst body is expanded by the package's /bin/sh, not here
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MKDEB_POSTINST='[ "$1" = configure ] && { echo "su-dummy-bad: postinst failing on purpose" >&2; exit 1; }; exit 0' \
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mkdeb su-dummy-bad 2.0 "$REPO_DIR"
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fi
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# ---------------------------------------------------------------- real sources
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if [ "$OFFLINE" = 1 ]; then
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mkdir -p /srv/su-disabled-sources
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for f in /etc/apt/sources.list /etc/apt/sources.list.d/*.sources /etc/apt/sources.list.d/*.list; do
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[ -e "$f" ] || continue
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case $f in "$SOURCES_FILE") continue ;; esac
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mv "$f" "/srv/su-disabled-sources/$(basename "$f")"
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done
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log "OFFLINE: real sources moved to /srv/su-disabled-sources"
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fi
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# ---------------------------------------------------------------- indexing
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install_tool() { # install_tool PACKAGE : needs the real mirrors
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[ "$OFFLINE" = 1 ] && die "SU_FIXTURE_INDEXER=$INDEXER needs network to install $1; use shell with OFFLINE"
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log "installing $1 (needs network)"
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apt-get update -qq >/dev/null
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apt-get install -y -qq --no-install-recommends "$1" >/dev/null
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}
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index_shell() {
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local f
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: > Packages
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for f in ./*.deb; do
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f=${f#./}
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dpkg-deb -f "$f" >> Packages
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printf 'Filename: ./%s\nSize: %s\nMD5sum: %s\nSHA256: %s\n\n' \
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"$f" "$(stat -c %s "$f")" "$(md5sum < "$f" | cut -d' ' -f1)" "$(sha256sum < "$f" | cut -d' ' -f1)" >> Packages
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done
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{
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printf 'Origin: su-fixture\nLabel: su-fixture\nSuite: su-repo\nCodename: su-repo\n'
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printf 'Date: %s\n' "$(date -u '+%a, %d %b %Y %H:%M:%S UTC')"
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printf 'SHA256:\n %s %s Packages\n' "$(sha256sum < Packages | cut -d' ' -f1)" "$(stat -c %s Packages)"
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} > Release
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}
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index_scanpackages() {
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command -v dpkg-scanpackages >/dev/null || install_tool dpkg-dev
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dpkg-scanpackages --multiversion . /dev/null > Packages 2>/dev/null
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# dpkg-scanpackages does not write a Release file; make a minimal one
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{
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printf 'Origin: su-fixture\nLabel: su-fixture\nSuite: su-repo\nCodename: su-repo\n'
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printf 'Date: %s\n' "$(date -u '+%a, %d %b %Y %H:%M:%S UTC')"
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printf 'SHA256:\n %s %s Packages\n' "$(sha256sum < Packages | cut -d' ' -f1)" "$(stat -c %s Packages)"
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} > Release
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}
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index_ftparchive() {
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command -v apt-ftparchive >/dev/null || install_tool apt-utils
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apt-ftparchive packages . > Packages
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apt-ftparchive \
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-o APT::FTPArchive::Release::Origin=su-fixture \
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-o APT::FTPArchive::Release::Label=su-fixture \
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-o APT::FTPArchive::Release::Suite=su-repo \
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-o APT::FTPArchive::Release::Codename=su-repo \
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release . > Release
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}
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( cd "$REPO_DIR" && "index_$INDEXER" )
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log "repo $REPO_DIR indexed with '$INDEXER': $(grep -c '^Package:' "$REPO_DIR/Packages") packages"
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echo "deb [trusted=yes] file:$REPO_DIR ./" > "$SOURCES_FILE"
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# ---------------------------------------------------------------- install old versions
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# --force-confnew + </dev/null: never block on a conffile prompt if the fixture is re-run in a dirty container
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dpkg --force-confnew -i "$OLD_DIR"/*.deb >/dev/null </dev/null
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if [ "$ORPHAN" = 1 ]; then
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apt-mark auto su-dummy-orphan >/dev/null
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fi
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if [ "$B_AUTO" = 1 ]; then
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apt-mark auto su-dummy-b >/dev/null
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fi
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log "installed (old): $(dpkg-query -W -f '${db:Status-Abbrev} ${Package}=${Version}\n' 'su-dummy-*' 2>/dev/null | awk '$1 == "ii" {printf "%s ", $2}')"
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# ---------------------------------------------------------------- refresh + verify
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# drop stale lists of our own repo first: apt compares mtimes of file: indexes with 1s resolution,
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# so a repo regenerated within the same second would otherwise be seen as "unchanged"
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rm -f /var/lib/apt/lists/"$(printf '%s' "$REPO_DIR" | tr / _)"_*
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apt-get update -qq >/dev/null
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fail=0
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upg=$(apt list --upgradable 2>/dev/null | awk -F/ '/^su-dummy-/{print $1}' | sort | tr '\n' ' ')
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for p in su-dummy-a su-dummy-b su-dummy-c; do
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case " $upg" in *" $p "*) ;; *) log "MISSING from upgradable: $p"; fail=1 ;; esac
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done
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sim=$(apt-get -s --with-new-pkgs upgrade 2>/dev/null | awk '/^Inst su-dummy-(a|b|c) /{n++} END{print n+0}')
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[ "$sim" -ge 3 ] || { log "simulated upgrade only covers $sim of 3 core packages"; fail=1; }
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[ "$fail" -eq 0 ] || die "fixture verification failed"
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log "upgradable dummy packages: $upg"
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if [ "$ORPHAN" = 1 ]; then
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apt-get -s autoremove 2>/dev/null | grep -q '^Remv su-dummy-orphan ' || die "su-dummy-orphan is not an autoremove candidate"
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log "pre-existing orphan (autoremove candidate): su-dummy-orphan"
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fi
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real=$(apt list --upgradable 2>/dev/null | awk -F/ 'NR>1 && $1 !~ /^su-dummy-/{print $1}' | tr '\n' ' ')
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if [ -n "$real" ]; then
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log "NOTE: real-world upgradable packages present in this base image: $real"
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else
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log "NOTE: no real-world upgradable packages in this base image right now"
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fi
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# shellcheck source=/dev/null
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log "OK in $(( $(date +%s) - T0 ))s (image: $(. /etc/os-release; echo "$PRETTY_NAME"))"
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