#!/usr/bin/make -f
# -*- makefile -*-

include /usr/share/dpkg/pkg-info.mk
include /usr/share/dpkg/vendor.mk
include /usr/share/dpkg/architecture.mk
SED_VERSION_SHORT := sed -re 's/([^.]+)\.([^.]+)\..*/\1.\2/'
RUST_VERSION := $(shell echo '$(DEB_VERSION_UPSTREAM)' | $(SED_VERSION_SHORT))
RUST_LONG_VERSION := $(shell echo '$(DEB_VERSION_UPSTREAM)' | sed -re 's/([^+]+).*/\1/')
LIBSTD_PKG := libstd-rust-$(RUST_VERSION)
# Sed expression that matches the "rustc" we have in our Build-Depends field
SED_RUSTC_BUILDDEP := sed -ne "/^Build-Depends:/,/^[^[:space:]\#]/{/^ *rustc:native .*,/p}" debian/control
# Version of /usr/bin/rustc
LOCAL_RUST_VERSION := $(shell rustc --version --verbose | sed -ne 's/^release: //p')

include /usr/share/dpkg/buildflags.mk
# TODO: more correct to use `[build] rustflags = []` list syntax in Cargo.toml
RUSTFLAGS = $(addprefix -C link-args=,$(LDFLAGS))
RUSTFLAGS += --cap-lints warn --remap-path-prefix=$(CURDIR)=/usr/src/rustc-$(RUST_LONG_VERSION)
export CFLAGS CXXFLAGS CPPFLAGS LDFLAGS RUSTFLAGS
export CARGO_HOME = $(CURDIR)/debian/cargo
ifneq (,$(filter $(DEB_BUILD_ARCH), sparc64))
export CARGO_INCREMENTAL = 0
endif

# Defines DEB_*_RUST_TYPE triples
include debian/architecture.mk
export DEB_HOST_RUST_TYPE

# Uncomment this to turn on verbose mode.
#export DH_VERBOSE=1

DEB_DESTDIR := $(CURDIR)/debian/tmp

# Use system LLVM (comment out to use vendored LLVM)
LLVM_VERSION = 7
OLD_LLVM_VERSION = 9
# Make it easier to test against a custom LLVM
ifneq (,$(LLVM_DESTDIR))
LLVM_LIBRARY_PATH := $(LLVM_DESTDIR)/usr/lib/$(DEB_HOST_MULTIARCH):$(LLVM_DESTDIR)/usr/lib
LD_LIBRARY_PATH := $(if $(LD_LIBRARY_PATH),$(LD_LIBRARY_PATH):$(LLVM_LIBRARY_PATH),$(LLVM_LIBRARY_PATH))
export LD_LIBRARY_PATH
endif

RUSTBUILD = RUST_BACKTRACE=1 python3 src/bootstrap/bootstrap.py
RUSTBUILD_FLAGS = --config debian/config.toml -vvv --on-fail env
RUSTBUILD_TEST = $(RUSTBUILD) test --no-fail-fast
# To run a specific test, run something like:
#   $ debian/rules override_dh_auto_test-arch \
#     RUSTBUILD_TEST_FLAGS="src/test/run-make --test-args extern-fn-struct"
# See src/bootstrap/README.md for more options.
RUSTBUILD_TEST_FLAGS =

update-version:
	oldver=$(shell $(SED_RUSTC_BUILDDEP) | sed -ne 's/.*(<= \(.*\)).*/\1/gp' | $(SED_VERSION_SHORT)); \
	newver=$(RUST_VERSION); \
	debian/update-version.sh $$oldver $$newver $(RUST_LONG_VERSION) $(CARGO_NEW)

# Below we detect how we're supposed to bootstrap the stage0 compiler. See
# README.Debian for more details of the cases described below.
#
PRECONFIGURE_CHECK = :
HAVE_BINARY_TARBALL := $(shell ls -1 stage0/*/*$(DEB_HOST_RUST_TYPE)* 2>/dev/null | wc -l)
DOWNLOAD_BOOTSTRAP := false
# allow not using the binary tarball although it exists
#ifneq (,$(filter $(DEB_HOST_ARCH), amd64 arm64 armhf i386 powerpc ppc64el s390x))
#  HAVE_BINARY_TARBALL := 0
#endif
ifeq (0,$(HAVE_BINARY_TARBALL))
    # Case A (Building from source): the extracted source tree does not include
    # a bootstrapping tarball for the current architecture e.g. because the
    # distro already has a rustc for this arch, or the uploader expects that
    # this requirement be fulfilled in some other way.
    #
    # Case A-1: the builder did not select the "pkg.rustc.dlstage0" build profile.
    # In this case, we use the distro's rustc - either the previous or current version.
    ifeq (,$(findstring pkg.rustc.dlstage0,$(DEB_BUILD_PROFILES)))
        # Make it easier to test against a custom rustc
        ifneq (,$(RUST_DESTDIR))
        RUST_LIBRARY_PATH := $(RUST_DESTDIR)/usr/lib/$(DEB_HOST_MULTIARCH):$(RUST_DESTDIR)/usr/lib
        LD_LIBRARY_PATH := $(if $(LD_LIBRARY_PATH),$(LD_LIBRARY_PATH):$(RUST_LIBRARY_PATH),$(RUST_LIBRARY_PATH))
        export LD_LIBRARY_PATH
        endif
    #
    # Case A-2: the builder selected the "dlstage0" build profile.
    # In this case, the rust build scripts will download a stage0 into stage0/ and use that.
    # We don't need to do anything specific in this build file, so this case is empty.
    else
        DOWNLOAD_BOOTSTRAP := true
    endif
else
    # Case B (Bootstrapping a new distro): the extracted source tree does
    # include a bootstrapping tarball for the current architecture; see the
    # `source_orig-stage0` target below on how to build this.
    #
    # In this case, we'll bootstrap from the stage0 given in that tarball.
    # To ensure the uploader of the .dsc didn't make a mistake, we first check
    # that rustc isn't a Build-Depends for the current architecture.
    ifneq (,$(shell $(SED_RUSTC_BUILDDEP)))
    ifeq (,$(shell $(SED_RUSTC_BUILDDEP) | grep '!$(DEB_HOST_ARCH)'))
        PRECONFIGURE_CHECK = $(error found matches for stage0/*/*$(DEB_HOST_RUST_TYPE)*, \
          but rustc might be a Build-Depends for $(DEB_HOST_ARCH))
    endif
    endif
endif

BUILD_DOCS := true
ifneq (,$(findstring nodoc,$(DEB_BUILD_PROFILES)))
  BUILD_DOCS := false
endif
ifneq (,$(findstring nodoc,$(DEB_BUILD_OPTIONS)))
  BUILD_DOCS := false
endif

#BUILD_WASM := true
BUILD_WASM := false
ifneq (,$(findstring nowasm,$(DEB_BUILD_PROFILES)))
  BUILD_WASM := false
endif

MAKE_OPTIMISATIONS := true
ifneq (,$(findstring noopt,$(DEB_BUILD_OPTIONS)))
  MAKE_OPTIMISATIONS := false
endif

# Build products or non-source files in src/, that shouldn't go in rust-src
SRC_CLEAN = src/bootstrap/bootstrap.pyc \
	src/etc/__pycache__/

# Workaround for linux #865549
ifeq (0,$(shell test $$(uname -s) = "Linux" -a $$(getconf PAGESIZE) -gt 4096; echo $$?))
  SYSTEM_WORKAROUNDS += ulimit -s $$(expr $$(getconf PAGESIZE) / 1024 '*' 256 + 8192);
endif
# Try to work around #933045
ifneq (,$(filter $(DEB_BUILD_ARCH), mips mipsel))
  SYSTEM_WORKAROUNDS += export MALLOC_ARENA_MAX=1;
endif

%:
	$(SYSTEM_WORKAROUNDS) dh $@ --parallel

.PHONY: build
build:
	$(SYSTEM_WORKAROUNDS) dh $@ --parallel

override_dh_clean:
	# Upstream contains a lot of these
	dh_clean -XCargo.toml.orig

debian/config.toml: debian/config.toml.in debian/rules
	u="$(DEB_VERSION_UPSTREAM)"; \
	if [ "$$u" != "$${u%~beta.*+dfsg*}" ]; then channel="beta"; \
	else channel="stable"; fi; echo $$channel; \
	m4  -DRELEASE_CHANNEL="$$channel" \
		-DDEB_BUILD_RUST_TYPE="$(DEB_BUILD_RUST_TYPE)" \
		-DDEB_HOST_RUST_TYPE="$(DEB_HOST_RUST_TYPE)" \
		-DDEB_TARGET_RUST_TYPE="$(DEB_TARGET_RUST_TYPE)" \
		-DDEB_BUILD_GNU_TYPE="$(DEB_BUILD_GNU_TYPE)" \
		-DDEB_HOST_GNU_TYPE="$(DEB_HOST_GNU_TYPE)" \
		-DDEB_TARGET_GNU_TYPE="$(DEB_TARGET_GNU_TYPE)" \
		-DMAKE_OPTIMISATIONS="$(MAKE_OPTIMISATIONS)" \
		-DLLVM_DESTDIR="$(LLVM_DESTDIR)" \
		-DLLVM_VERSION="$(LLVM_VERSION)" \
		-DRUST_DESTDIR="$(RUST_DESTDIR)" \
		"$<" > "$@"
	if $(DOWNLOAD_BOOTSTRAP) || [ $(HAVE_BINARY_TARBALL) != 0 ]; \
	  then sed -i -e '/^rustc = /d' -e '/^cargo = /d' "$@"; fi
# Work around low-memory (32-bit) architectures: https://github.com/rust-lang/rust/issues/45854
ifneq (,$(filter $(DEB_BUILD_ARCH), armhf armel i386 mips mipsel powerpc powerpcspe))
	sed -i -e 's/^debuginfo-level = .*/debuginfo-level = 0/g' "$@"
endif

debian/rust-src.%: debian/rust-src.%.in
	m4  -DRUST_LONG_VERSION="$(RUST_LONG_VERSION)" \
		"$<" > "$@"

debian/dh_auto_configure.stamp: debian/config.toml
	# fail the build if we have any instances of OLD_LLVM_VERSION in debian, except for debian/changelog
	#! grep --color=always -i 'll\(..\|d\)-\?$(subst .,\.,$(OLD_LLVM_VERSION))' --exclude=changelog --exclude='*.patch' --exclude-dir='.debhelper' -R debian
	# fail the build if we accidentally vendored openssl, indicates we pulled in unnecessary dependencies
	test ! -e vendor/openssl
	# fail the build if we didn't update d-ignore-error-detail-diff.patch
	! grep -Ri '\$$SRC_DIR' src/test/
	# fail the build if our version contains ~exp and we are not releasing to experimental
	v="$(DEB_VERSION)"; test "$$v" = "$${v%~exp*}" -o "$(DEB_DISTRIBUTION)" = "experimental" -o "$(DEB_DISTRIBUTION)" = "UNRELEASED"
	$(PRECONFIGURE_CHECK)
	if [ -d stage0 ]; then mkdir -p build && ln -sfT ../stage0 build/cache; fi
	# work around #842634
	if test $$(grep "127.0.0.1\s*localhost" /etc/hosts | wc -l) -gt 1; then \
	  debian/ensure-patch -N debian/patches/d-host-duplicates.patch; fi
	# work around https://github.com/rust-lang/rust/issues/59264
	# We patched some crates so have to rm the checksums
	find vendor -name .cargo-checksum.json -execdir "$(CURDIR)/debian/prune-checksums" "{}" +
	# Link against system liblzma, see https://github.com/alexcrichton/xz2-rs/issues/16
	echo 'fn main() { println!("cargo:rustc-link-lib=lzma"); }' > vendor/lzma-sys/build.rs
	# We don't run ./configure because we use debian/config.toml directly
	ln -sf debian/config.toml config.toml
	touch "$@"

override_dh_auto_configure-arch: debian/dh_auto_configure.stamp
override_dh_auto_configure-indep: debian/dh_auto_configure.stamp
ifeq (true,$(BUILD_DOCS))
# Change config.toml now and not later, since that might trigger a rebuild
	sed -i -e 's/^docs = false/docs = true/' debian/config.toml
endif

override_dh_auto_clean:
	$(RM) -rf build tmp .cargo debian/cargo_home config.stamp config.mk Makefile
	$(RM) -rf $(TEST_LOG) debian/config.toml debian/rust-src.install debian/rust-src.links debian/*.stamp
	$(RM) -rf $(SRC_CLEAN) config.toml

debian/dh_auto_build.stamp:
	$(RUSTBUILD) build $(RUSTBUILD_FLAGS)

override_dh_auto_build-arch: debian/dh_auto_build.stamp
override_dh_auto_build-indep: debian/dh_auto_build.stamp
ifeq (true,$(BUILD_WASM))
	$(RUSTBUILD) build $(RUSTBUILD_FLAGS) \
	  --host $(DEB_BUILD_RUST_TYPE) \
	  --target wasm32-unknown-unknown,wasm32-wasi \
	  src/libstd
endif
ifeq (true,$(BUILD_DOCS))
	$(RUSTBUILD) doc $(RUSTBUILD_FLAGS)
endif

TEST_LOG = debian/rustc-tests.log
# This is advertised as "5 tests failed" in README.Debian because our counting
# method is imprecise and in practise we count some failures twice.
FAILURES_ALLOWED = 8
ifneq (,$(filter $(DEB_BUILD_ARCH), ppc64 arm64 mips64el i386))
  FAILURES_ALLOWED = 12
endif
ifneq (,$(filter $(DEB_BUILD_ARCH), mips mipsel s390x))
  FAILURES_ALLOWED = 24
endif
ifneq (,$(filter $(DEB_BUILD_ARCH), powerpc powerpcspe riscv64 sparc64 x32))
  FAILURES_ALLOWED = 180
endif
FAILED_TESTS = grep "FAILED\|^command did not execute successfully" $(TEST_LOG) | grep -v '^test result: FAILED'
override_dh_auto_test-arch:
	# ensure that rustc_llvm is actually dynamically linked to libLLVM
	set -e; find build/*/stage2/lib/rustlib/* -name '*rustc_llvm*.so' | \
	while read x; do \
		stat -c '%s %n' "$$x"; \
		objdump -p "$$x" | grep -q "NEEDED.*LLVM"; \
		test "$$(stat -c %s "$$x")" -lt 6000000; \
	done
ifeq (, $(filter nocheck,$(DEB_BUILD_PROFILES)))
ifeq (, $(filter nocheck,$(DEB_BUILD_OPTIONS)))
	{ $(RUSTBUILD_TEST) $(RUSTBUILD_FLAGS) $(RUSTBUILD_TEST_FLAGS); echo $$?; } | tee -a $(TEST_LOG)
	# test that the log has at least 1 pass, to prevent e.g. #57709
	grep -l "^test .* \.\.\. ok$$" $(TEST_LOG)
	echo "==== Debian rustc test report ===="; \
	echo "Specific test failures:"; \
	$(FAILED_TESTS); \
	num_failures=$$($(FAILED_TESTS) | wc -l); \
	exit_code=$$(tail -n1 $(TEST_LOG)); \
	echo "Summary: exit code $$exit_code, counted $$num_failures tests failed."; \
	echo -n "$(FAILURES_ALLOWED) maximum allowed. "; \
	if test "$$num_failures" -eq 0 -a "$$exit_code" -ne 0; then \
	  echo "Aborting just in case, because we missed counting some test failures."; \
	  echo "This could happen if we failed to build the tests, or if the testsuite runner is buggy."; \
	  false; \
	elif test "$$num_failures" -le $(FAILURES_ALLOWED); then \
	  echo "Continuing..."; \
	else \
	  echo "Aborting the build."; \
	  echo "Check the logs further above for details."; \
	  false; \
	fi
# don't continue if RUSTBUILD_TEST_FLAGS is non-empty
	test -z "$(RUSTBUILD_TEST_FLAGS)"
endif
endif

override_dh_auto_test-indep:
ifeq (, $(filter nocheck,$(DEB_BUILD_PROFILES)))
ifeq (, $(filter nocheck,$(DEB_BUILD_OPTIONS)))
ifeq (true,$(BUILD_WASM))
	# Ignore failures in these tests, but run them so we see what it's like
	-PATH=$(CURDIR)/debian/bin:$(PATH) $(RUSTBUILD_TEST) $(RUSTBUILD_FLAGS) $(RUSTBUILD_TEST_FLAGS) \
	  --host $(DEB_BUILD_RUST_TYPE) \
	  --target wasm32-unknown-unknown,wasm32-wasi \
	  src/libstd
endif
ifeq (true,$(BUILD_DOCS))
	# Run all rules that test the docs, i.e. that depend on default:doc
	$(RUSTBUILD_TEST) $(RUSTBUILD_FLAGS) src/tools/linkchecker
endif
	test -z "$(RUSTBUILD_TEST_FLAGS)"
endif
endif

run_rustbuild:
	DESTDIR=$(DEB_DESTDIR) $(RUSTBUILD) $(X_CMD) $(RUSTBUILD_FLAGS) $(X_FLAGS)

debian/dh_auto_install.stamp:
	DESTDIR=$(DEB_DESTDIR) $(RUSTBUILD) install $(RUSTBUILD_FLAGS)

	mkdir -p $(DEB_DESTDIR)/usr/lib/$(DEB_HOST_MULTIARCH)/
	mv $(DEB_DESTDIR)/usr/lib/lib*.so $(DEB_DESTDIR)/usr/lib/$(DEB_HOST_MULTIARCH)/

	# Replace duplicated compile-time/run-time dylibs with symlinks
	@set -e; \
	for f in $(DEB_DESTDIR)/usr/lib/rustlib/$(DEB_HOST_RUST_TYPE)/lib/lib*.so; do \
	  name=$${f##*/}; \
	  if [ -f "$(DEB_DESTDIR)/usr/lib/$(DEB_HOST_MULTIARCH)/$$name" ]; then \
	    echo "ln -sf ../../../$(DEB_HOST_MULTIARCH)/$$name $$f"; \
	    ln -sf ../../../$(DEB_HOST_MULTIARCH)/$$name $$f; \
	  fi; \
	done

	touch "$@"

override_dh_auto_install-arch: debian/dh_auto_install.stamp
override_dh_auto_install-indep: debian/dh_auto_install.stamp
ifeq (true,$(BUILD_WASM))
	DESTDIR=$(DEB_DESTDIR) $(RUSTBUILD) install $(RUSTBUILD_FLAGS) \
	  --host $(DEB_BUILD_RUST_TYPE) \
	  --target wasm32-unknown-unknown,wasm32-wasi \
	  src/libstd
endif
ifeq (true,$(BUILD_DOCS))
	# Brute force to remove privacy-breach-logo lintian warning.
	# We could have updated the upstream sources but it would complexify
	# the rebase
	@set -e; \
	find $(DEB_DESTDIR)/usr/share/doc/*/html -iname '*.html' | \
	while read file; do \
	  topdir=$$(echo "$$file" | sed 's,^$(DEB_DESTDIR)/usr/share/doc/rust/html/,,; s,/[^/]*$$,/,; s,^[^/]*$$,,; s,[^/]\+/,../,g'); \
	  sed -i \
	    -e "s,https://\(doc\|www\).rust-lang.org/\(favicon.ico\|logos/rust-logo-32x32-blk.png\),$${topdir}rust-logo-32x32-blk.png," \
	    -e 's,<img src="https://img.shields.io/[^"]*" alt="\([^"]*\)" />,<span class="deb-privacy-replace--shields-io">\1</span>,g' "$$file"; \
	done
	find $(DEB_DESTDIR) \( -iname '*.html' -empty -o -name .lock -o -name '*.inc' \) -delete;
endif

override_dh_install-arch:
	dh_install
	dh_install -p$(LIBSTD_PKG) usr/lib/$(DEB_HOST_MULTIARCH)/
	dh_install -plibstd-rust-dev usr/lib/rustlib/$(DEB_HOST_RUST_TYPE)/lib/

override_dh_install-indep: debian/rust-src.install debian/rust-src.links
	dh_install
ifeq (true,$(BUILD_WASM))
	dh_install -plibstd-rust-dev-wasm32-cross usr/lib/rustlib/wasm32-*/lib/
endif
	chmod -x \
	  debian/rust-gdb/usr/share/rust-gdb/*.py \
	  debian/rust-lldb/usr/share/rust-lldb/*.py
	$(RM) -rf $(SRC_CLEAN:%=debian/rust-src/usr/src/rustc-$(RUST_LONG_VERSION)/%)
	# Get rid of lintian warnings
	find debian/rust-src/usr/src/rustc-$(RUST_LONG_VERSION) \
		\( -name .gitignore \
		-o -name 'LICENSE*' \
		-o -name 'LICENCE' \
		-o -name 'license' \
		-o -name 'COPYING*' \
		\) -delete
	# Remove files that autoload remote resources, caught by lintian
	$(RM) -rf debian/rust-src/usr/src/rustc-*/vendor/cssparser/docs/*.html
	$(RM) -rf debian/rust-src/usr/src/rustc-*/vendor/kuchiki/docs/*.html
	$(RM) -rf debian/rust-src/usr/src/rustc-*/vendor/url/docs/*.html
	$(RM) -rf debian/rust-src/usr/src/rustc-*/vendor/xz2/.gitmodules

override_dh_installchangelogs:
	dh_installchangelogs RELEASES.md

override_dh_installdocs:
	dh_installdocs -X.tex -X.aux -X.log -X.out -X.toc

override_dh_missing:
	dh_missing --list-missing

override_dh_compress:
	dh_compress -X.woff

# The below override is disabled on advice from #debian-devel, because:
# - only shared libs get the "split dbgsym package" treatment by dh_strip;
#   static libs simply get their debuginfo discarded
# - strip(1) sometimes breaks wasm libs
#
#override_dh_strip:
#	# Work around #35733, #468333
#	find debian/libstd-rust-dev*/ -name '*.rlib' -execdir mv '{}' '{}.a' \;
#	# This is expected to print out lots of "File format unrecognized" warnings about
#	# rust.metadata.bin and *.deflate but the .o files inside the rlibs should be stripped
#	# Some files are still omitted because of #875780 however.
#	dh_strip -v
#	find debian/libstd-rust-dev*/ -name '*.rlib.a' -execdir sh -c 'mv "$$1" "$${1%.a}"' - '{}' \;

override_dh_makeshlibs:
	dh_makeshlibs -V

	# dh_makeshlibs doesn't support our "libfoo-version.so" naming
	# structure, so we have to do this ourselves.
	install -o 0 -g 0 -d debian/$(LIBSTD_PKG)/DEBIAN
	LC_ALL=C ls debian/$(LIBSTD_PKG)/usr/lib/$(DEB_HOST_MULTIARCH)/lib*.so | \
	sed -n 's,^.*/\(lib.*\)-\(.\+\)\.so$$,\1 \2,p' | \
	while read name version; do \
	  echo "$$name $$version $(LIBSTD_PKG) (>= $(DEB_VERSION_UPSTREAM))"; \
	done > debian/$(LIBSTD_PKG)/DEBIAN/shlibs
	chmod 644 debian/$(LIBSTD_PKG)/DEBIAN/shlibs
	chown 0:0 debian/$(LIBSTD_PKG)/DEBIAN/shlibs

override_dh_shlibdeps:
	dh_shlibdeps -- -x$(LIBSTD_PKG)

QUILT_SPECIAL_SNOWFLAKE_RETURN_CODE = x=$$?; if [ $$x = 2 ]; then exit 0; else exit $$x; fi
source_orig-stage0:
	QUILT_PATCHES=debian/patches quilt push -aq; $(QUILT_SPECIAL_SNOWFLAKE_RETURN_CODE)
	$(MAKE) -f debian/rules clean
	debian/make_orig-stage0_tarball.sh
	QUILT_PATCHES=debian/patches quilt pop -aq; $(QUILT_SPECIAL_SNOWFLAKE_RETURN_CODE)
	rm -rf .pc

get_beta_version = \
	u="$(DEB_VERSION_UPSTREAM)"; \
	if [ "$$u" != "$${u%~beta.*+dfsg*}" ]; then \
	newver=$(shell echo $(RUST_VERSION) | perl -lpe 's/(\d+)\.(\d+)/$$1 . "." . ($$2)/e'); \
	else \
	newver=$(shell echo $(RUST_VERSION) | perl -lpe 's/(\d+)\.(\d+)/$$1 . "." . ($$2+1)/e'); \
	fi

debian/watch-beta: debian/watch-beta.in debian/rules
	set -e; $(get_beta_version); \
	m4 -DOLDVER="$$oldver" -DNEWVER="$$newver.0" "$<" > "$@"

source_orig-beta: debian/watch-beta
	uscan $(USCAN_OPTS) $(if $(USCAN_DESTDIR),--destdir=$(USCAN_DESTDIR),) --verbose --watchfile "$<"
	set -e; $(get_beta_version); \
	bd="$(if $(USCAN_DESTDIR),$(USCAN_DESTDIR),..)"; \
	tar xf $$bd/rustc-$$newver.0-beta.999-src.tar.xz rustc-beta-src/version; \
	bv="$$(sed -re 's/[0-9]+.[0-9]+.[0-9]+-beta.([0-9]+) \(.*\)/\1/g' rustc-beta-src/version)"; \
	bash -c 'shopt -s nullglob; for i in '"$$bd"'/rustc*beta.999*; do mv $$i $${i/beta.999/beta.'"$$bv"'}; done'; \
	rm -f rustc-beta-src/version; \
	rmdir -p rustc-beta-src; \
	echo "prepared rustc $$newver.0~beta.$$bv in $$bd"