implement installation of fake packages

zlibs/helpers

@@ -252,6 +252,8 @@ EOF
 
 chroot-script() {
 	fn chroot-script "$@"
+	req=(strapdir)
+	ckreq || return 1
 
 	case "x$1" in
 		x-d)
@@ -275,6 +277,43 @@ chroot-script() {
 	sudo rm -f $strapdir/$script
 }
 
+install_fake_package() {
+	fn install_fake_package "$@"
+	req=(strapdir pkgname pkgver section)
+	local pkgname="$1"
+	local pkgver="$2"
+	local section="$3"
+	ckreq || return 1
+
+	local _tmp="$strapdir/tmp"
+	sudo mkdir -p "$_tmp/$pkgname"
+
+	cat <<EOF | sudo tee ${_tmp}/${pkgname}/${pkgname}_${pkgver}.control >/dev/null
+Section: ${section}
+Priority: optional
+Homepage: https://devuan.org/
+Standards-Version: 3.9.6
+
+Package: ${pkgname}
+Version: ${pkgver}
+Maintainer: Devuan developers <onelove@devuan.org>
+Architecture: all
+Description: (Fake) ${pkgname}
+  Dummy package used to meet some dependencies without installing the
+  real ${pkgname} package.
+EOF
+
+	cat <<EOF | sudo tee ${strapdir}/install-fake-package >/dev/null
+#!/bin/sh
+cd /tmp/${pkgname}
+equivs-build ${pkgname}_${pkgver}.control \
+	&& dpkg -i ${pkgname}_${pkgver}_all.deb || exit 1
+cd /tmp
+rm -rf ${pkgname}
+EOF
+	chroot-script install-fake-package || zerr
+}
+
 blend_preinst() {
 	fn blend_preinst
 	func "not overriden"