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tests/unit/fakes/apt/apt-mark

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+#!/usr/bin/env bash
+# SPDX-License-Identifier: GPL-2.0-or-later
+# Copyright (C) 2026 Bryan Joshua Pedini
+
+# fake apt-mark (unit tests): hold state in $FAKE_DIR/holds (one name per line).
+# FAKE_APT_MARK_LOCKED=N: the first N hold/unhold calls fail like dpkg's busy frontend lock.
+# FAKE_APT_MARK_UNHOLD_SIGNAL=SIG: send SIG to the applet before an unhold (a second Ctrl-C).
+# FAKE_APT_MARK_UNHOLD_RC=N: unhold fails (nothing released). FAKE_APT_MARK_FAIL_MSG: the message a
+# failing hold prints. Every unhold logs whether $STATE_DIR/holds.lock is held by someone.
+# shellcheck source=../fakelib.bash
+. "${BASH_SOURCE[0]%/*}/../fakelib.bash"
+fake_log "$@"
+h=$FAKE_DIR/holds
+touch "$h"
+verb=$1
+shift
+case $verb in hold | unhold)
+	if [[ -n ${FAKE_APT_MARK_LOCKED:-} ]]; then
+		n=$(cat "$FAKE_DIR/locked-calls" 2>/dev/null || echo 0)
+		if ((n < FAKE_APT_MARK_LOCKED)); then
+			echo $((n + 1)) >"$FAKE_DIR/locked-calls"
+			echo "${FAKE_APT_MARK_LOCK_MSG:-dpkg: error: dpkg frontend lock was locked by another process with pid 4242}"
+			echo "E: Sub-process dpkg --set-selections returned an error code (2)"
+			echo "E: Executing dpkg failed. Are you root?"
+			exit 100
+		fi
+	fi
+	;;
+esac
+case $verb in
+showhold) sort "$h" ;;
+hold)
+	for p in "$@"; do
+		if grep -qxF -- "$p" "$h"; then echo "$p was already set on hold."; else
+			echo "$p" >>"$h"
+			echo "$p set on hold."
+		fi
+	done
+	[[ -z ${FAKE_APT_MARK_FAIL_MSG:-} ]] || echo "$FAKE_APT_MARK_FAIL_MSG" >&2
+	exit "$(fake_rc FAKE_APT_MARK_HOLD_RC 0)"
+	;;
+unhold)
+	if [[ -n ${SKEPTICAL_UPDATER_STATE_DIR:-} && -e $SKEPTICAL_UPDATER_STATE_DIR/holds.lock ]] && command -v flock >/dev/null; then
+		if flock -n "$SKEPTICAL_UPDATER_STATE_DIR/holds.lock" true; then l=free; else l=held; fi
+		echo "holds.lock during unhold: $l" >>"$FAKE_LOG"
+	fi
+	if [[ -n ${FAKE_APT_MARK_UNHOLD_RC:-} ]]; then
+		echo "E: Unable to correct problems" >&2
+		exit "$FAKE_APT_MARK_UNHOLD_RC"
+	fi
+	if [[ -n ${FAKE_APT_MARK_UNHOLD_SIGNAL:-} ]]; then
+		kill -s "$FAKE_APT_MARK_UNHOLD_SIGNAL" "$(cat "$FAKE_DIR/applet.pid" 2>/dev/null || echo "$PPID")" 2>/dev/null
+		sleep 0.2
+	fi
+	for p in "$@"; do
+		if grep -qxF -- "$p" "$h"; then
+			grep -vxF -- "$p" "$h" >"$h.new" || true
+			mv "$h.new" "$h"
+			echo "Canceled hold on $p."
+		else echo "$p was already not on hold."; fi
+	done
+	;;
+*)
+	echo "fake apt-mark: unhandled: $verb $*" >&2
+	exit 99
+	;;
+esac