[deb] Switch from dpkg-deb to dm.pl.

Cygwin was the only platform using dm.pl; now all except iOS are using it. iOS
has dpkg-deb with the “lzma obsolete” check removed, and there are some issues
with Perl, so not switching over there. There is a dependency on a binary
component  (Compress::Raw::Lzma) so for now we’re asking users to install
IO::Compress::Lzma manually. CI updated to install that, and post-update updated
to try to install it at update-theos time.

.gitmodules

@@ -4,3 +4,6 @@
 [submodule "vendor/lib"]
 	path = vendor/lib
 	url = https://github.com/theos/lib.git
+[submodule "vendor/dm.pl"]
+	path = vendor/dm.pl
+	url = https://github.com/theos/dm.pl.git

bin/dm.pl

@@ -0,0 +1 @@
+../vendor/dm.pl/dm.pl

bin/post-update

@@ -1,6 +1,26 @@
 #!/bin/bash
-# since `git submodule foreach` doesn’t get called for submodules that aren’t
-# cloned, force vendor/lib to be cloned here
+# since `git submodule foreach` doesn’t get called for submodules that aren’t cloned, force
+# vendor/lib and vendor/dm.pl to be cloned here
 if [[ ! -f "vendor/lib/.git" ]]; then
 	git submodule update --init vendor/lib
 fi
+
+if [[ ! -f "vendor/dm.pl/.git" ]]; then
+	git submodule update --init vendor/dm.pl
+fi
+
+# dm.pl requires IO::Compress::Lzma to be installed, which uses Compress::Raw::Lzma, which
+# tragically includes a binary component, which tragically requires root to install if using system
+# perl. we don’t use dm.pl on iOS so skip this check there
+if [[ "$(uname -o)-$(uname -p)" != "Darwin-arm" ]] && ! perl -MIO::Compress::Lzma -e '1' 2>/dev/null; then
+	if [[ $(which perl) == /usr/bin/perl ]]; then
+		echo "A Perl dependency needs to be installed. This will require your password for sudo. Provide it below, or press Ctrl-C and then run this manually:"
+		echo
+		echo "  sudo cpan IO::Compress::Lzma"
+		echo
+		sudo PERL_MM_USE_DEFAULT=1 cpan IO::Compress::Lzma
+	else
+		echo "Installing a Perl module dependency. This may take a minute."
+		PERL_MM_USE_DEFAULT=1 cpan IO::Compress::Lzma
+	fi
+fi

extras/ci/cygwin-setup.sh

@@ -17,6 +17,10 @@ if [[ -z $THEOS ]]; then
 	exit 1
 fi
 
+# install dependencies
+status "Installing dependencies"
+PERL_MM_USE_DEFAULT=1 cpan IO::Compress::Lzma
+
 # ensure we’re in $THEOS
 cd $THEOS
 

extras/ci/macos-setup.sh

@@ -23,8 +23,8 @@ brew update
 
 # install dependencies
 status "Installing dependencies"
-brew install fakeroot ldid
-brew install --force-bottle https://raw.githubusercontent.com/Homebrew/homebrew-core/7a4dabfc1a2acd9f01a1670fde4f0094c4fb6ffa/Formula/dpkg.rb
+brew install ldid
+PERL_MM_USE_DEFAULT=1 cpan IO::Compress::Lzma
 
 # ensure we’re in $THEOS
 cd $THEOS

makefiles/package/deb.mk

@@ -2,7 +2,7 @@ ifeq ($(_THEOS_PACKAGE_FORMAT_LOADED),)
 _THEOS_PACKAGE_FORMAT_LOADED := 1
 
 _THEOS_PLATFORM_DU ?= du
-_THEOS_PLATFORM_DPKG_DEB ?= dpkg-deb
+_THEOS_PLATFORM_DPKG_DEB ?= dm.pl
 _THEOS_PLATFORM_DPKG_DEB_COMPRESSION ?= lzma
 
 _THEOS_DEB_PACKAGE_CONTROL_PATH := $(or $(wildcard $(THEOS_PROJECT_DIR)/control),$(wildcard $(THEOS_LAYOUT_DIR)/DEBIAN/control))

makefiles/platform/Darwin-arm.mk

@@ -3,6 +3,7 @@ _THEOS_PLATFORM_LOADED := 1
 THEOS_PLATFORM_NAME := iphone
 
 _THEOS_PLATFORM_DEFAULT_TARGET := iphone
+_THEOS_PLATFORM_DPKG_DEB := dpkg-deb
 _THEOS_PLATFORM_DU_EXCLUDE := --exclude
 _THEOS_PLATFORM_MD5SUM := md5sum
 _THEOS_PLATFORM_LIPO = lipo

makefiles/platform/Windows.mk

@@ -4,8 +4,6 @@ THEOS_PLATFORM_NAME := windows
 
 _THEOS_PLATFORM_DEFAULT_TARGET := iphone
 _THEOS_PLATFORM_DU_EXCLUDE := --exclude
-_THEOS_PLATFORM_DPKG_DEB := dm.pl
-_THEOS_PLATFORM_DPKG_DEB_COMPRESSION := gzip
 _THEOS_PLATFORM_MD5SUM := md5sum
 # TODO: Figure out if hardcoding "/iphone/" in _THEOS_PLATFORM_LIPO's path is a good idea or not
 _THEOS_PLATFORM_LIPO = $(THEOS)/toolchain/$(THEOS_PLATFORM_NAME)/iphone/bin/$(SDKTARGET)-lipo