merge #16392: macOS toolchain update

.gitlab-ci.yml

@@ -37,7 +37,7 @@ builder-image:
   image: $CI_REGISTRY_IMAGE:builder-$CI_COMMIT_REF_SLUG
   variables:
     SDK_URL: https://bitcoincore.org/depends-sources/sdks
-    OSX_SDK: "10.11"
+    OSX_SDK: "10.14"
     MAKEJOBS: -j4
   before_script:
     - echo HOST=$HOST

.travis.yml

@@ -314,7 +314,7 @@ after_success:
       env: >-
         HOST=x86_64-apple-darwin16
         PACKAGES="cmake imagemagick libcap-dev librsvg2-bin libz-dev libbz2-dev libtiff-tools python3-dev python3-setuptools"
-        OSX_SDK=10.11
+        OSX_SDK=10.14
         RUN_UNIT_TESTS=false
         RUN_FUNCTIONAL_TESTS=false
         GOAL="deploy"

ci/matrix.sh

@@ -83,7 +83,7 @@ elif [ "$BUILD_TARGET" = "linux64_release" ]; then
 elif [ "$BUILD_TARGET" = "mac" ]; then
   export HOST=x86_64-apple-darwin16
   export BITCOIN_CONFIG="--enable-gui --enable-reduce-exports --disable-miner"
-  export OSX_SDK=10.11
+  export OSX_SDK=10.14
   export GOAL="all deploy"
   export RUN_UNITTESTS=false
   export RUN_INTEGRATIONTESTS=false

contrib/gitian-build.py

@@ -70,8 +70,8 @@ def build():
 
     if args.macos:
         print('\nCompiling ' + args.version + ' MacOS')
-        subprocess.check_call(['wget', '-N', '-P', 'inputs', 'https://bitcoincore.org/depends-sources/sdks/MacOSX10.11.sdk.tar.gz'])
+        subprocess.check_call(['wget', '-N', '-P', 'inputs', 'https://bitcoincore.org/depends-sources/sdks/MacOSX10.14.sdk.tar.gz'])
-        subprocess.check_output(["echo 'bec9d089ebf2e2dd59b1a811a38ec78ebd5da18cbbcd6ab39d1e59f64ac5033f inputs/MacOSX10.11.sdk.tar.gz' | sha256sum -c"], shell=True)
+        subprocess.check_output(["echo '328aff47e28c17093d59a72712a9b2e62cd8a8b87bbe03f91abb32960b413f0f inputs/MacOSX10.14.sdk.tar.gz' | sha256sum -c"], shell=True)
         subprocess.check_call(['bin/gbuild', '-j', args.jobs, '-m', args.memory, '--commit', 'dash='+args.commit, '--url', 'dash='+args.url, '../dash/contrib/gitian-descriptors/gitian-osx.yml'])
         subprocess.check_call(['bin/gsign', '-p', args.sign_prog, '--signer', args.signer, '--release', args.version+'-osx-unsigned', '--destination', '../gitian.sigs/', '../dash/contrib/gitian-descriptors/gitian-osx.yml'])
         subprocess.check_call('mv build/out/dashcore-*-osx-unsigned.tar.gz inputs/dashcore-osx-unsigned.tar.gz', shell=True)

contrib/gitian-descriptors/gitian-osx.yml

@@ -31,7 +31,7 @@ remotes:
 - "url": "https://github.com/dashpay/dash.git"
   "dir": "dash"
 files:
-- "MacOSX10.11.sdk.tar.gz"
+- "MacOSX10.14.sdk.tar.gz"
 script: |
   set -e -o pipefail
 
@@ -107,7 +107,7 @@ script: |
   BASEPREFIX=`pwd`/depends
 
   mkdir -p ${BASEPREFIX}/SDKs
-  tar -C ${BASEPREFIX}/SDKs -xf ${BUILD_DIR}/MacOSX10.11.sdk.tar.gz
+  tar -C ${BASEPREFIX}/SDKs -xf ${BUILD_DIR}/MacOSX10.14.sdk.tar.gz
 
   # Build dependencies for each host
   for i in $HOSTS; do

contrib/macdeploy/README.md

@@ -1,15 +1,136 @@
-### MacDeploy ###
+# MacOS Deployment
 
-For Snow Leopard (which uses [Python 2.6](http://www.python.org/download/releases/2.6/)), you will need the param_parser package:
+The `macdeployqtplus` script should not be run manually. Instead, after building as usual:
-
-	sudo easy_install argparse
-
-This script should not be run manually, instead, after building as usual:
 
+```bash
 make deploy
+```
 
-During the process, the disk image window will pop up briefly where the fancy
+During the deployment process, the disk image window will pop up briefly
-settings are applied. This is normal, please do not interfere.
+when the fancy settings are applied. This is normal, please do not interfere,
+the process will unmount the DMG and cleanup before finishing.
 
-When finished, it will produce `Dash-Core.dmg`.
+When complete, it will have produced `Dash-Qt.dmg`.
+
+## SDK Extraction
+
+`Xcode.app` is packaged in a `.xip` archive.
+This makes the SDK less-trivial to extract on non-macOS machines.
+One approach (tested on Debian Buster) is outlined below:
+
+```bash
+
+apt install clang cpio git liblzma-dev libxml2-dev libssl-dev make
+
+git clone https://github.com/tpoechtrager/xar
+pushd xar/xar
+./configure
+make
+make install
+popd
+
+git clone https://github.com/NiklasRosenstein/pbzx
+pushd pbzx
+clang -llzma -lxar pbzx.c -o pbzx -Wl,-rpath=/usr/local/lib
+popd
+
+xar -xf Xcode_10.2.1.xip -C .
+
+./pbzx/pbzx -n Content | cpio -i
+
+find Xcode.app -type d -name MacOSX.sdk -execdir sh -c 'tar -c MacOSX.sdk/ | gzip -9n > /MacOSX10.14.sdk.tar.gz' \;
+```
+
+on macOS the process is more straightforward:
+
+```bash
+xip -x Xcode_10.2.1.xip
+tar -C Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/ -czf MacOSX10.14.sdk.tar.gz MacOSX.sdk
+```
+
+Our previously used macOS SDK (`MacOSX10.11.sdk`) can be extracted from
+[Xcode 7.3.1 dmg](https://developer.apple.com/devcenter/download.action?path=/Developer_Tools/Xcode_7.3.1/Xcode_7.3.1.dmg).
+The script [`extract-osx-sdk.sh`](./extract-osx-sdk.sh) automates this. First
+ensure the DMG file is in the current directory, and then run the script. You
+may wish to delete the `intermediate 5.hfs` file and `MacOSX10.11.sdk` (the
+directory) when you've confirmed the extraction succeeded.
+
+```bash
+apt-get install p7zip-full sleuthkit
+contrib/macdeploy/extract-osx-sdk.sh
+rm -rf 5.hfs MacOSX10.11.sdk
+```
+
+## Deterministic macOS DMG Notes
+Working macOS DMGs are created in Linux by combining a recent `clang`, the Apple
+`binutils` (`ld`, `ar`, etc) and DMG authoring tools.
+
+Apple uses `clang` extensively for development and has upstreamed the necessary
+functionality so that a vanilla clang can take advantage. It supports the use of `-F`,
+`-target`, `-mmacosx-version-min`, and `--sysroot`, which are all necessary when
+building for macOS.
+
+Apple's version of `binutils` (called `cctools`) contains lots of functionality missing in the
+FSF's `binutils`. In addition to extra linker options for frameworks and sysroots, several
+other tools are needed as well such as `install_name_tool`, `lipo`, and `nmedit`. These
+do not build under Linux, so they have been patched to do so. The work here was used as
+a starting point: [mingwandroid/toolchain4](https://github.com/mingwandroid/toolchain4).
+
+In order to build a working toolchain, the following source packages are needed from
+Apple: `cctools`, `dyld`, and `ld64`.
+
+These tools inject timestamps by default, which produce non-deterministic binaries. The
+`ZERO_AR_DATE` environment variable is used to disable that.
+
+This version of `cctools` has been patched to use the current version of `clang`'s headers
+and its `libLTO.so` rather than those from `llvmgcc`, as it was originally done in `toolchain4`.
+
+To complicate things further, all builds must target an Apple SDK. These SDKs are free to
+download, but not redistributable. To obtain it, register for an Apple Developer Account,
+then download [Xcode 10.2.1](https://download.developer.apple.com/Developer_Tools/Xcode_10.2.1/Xcode_10.2.1.xip).
+
+This file is many gigabytes in size, but most (but not all) of what we need is
+contained only in a single directory:
+
+```bash
+Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk
+```
+
+See the SDK Extraction notes above for how to obtain it.
+
+The Gitian descriptors build 2 sets of files: Linux tools, then Apple binaries which are
+created using these tools. The build process has been designed to avoid including the
+SDK's files in Gitian's outputs. All interim tarballs are fully deterministic and may be freely
+redistributed.
+
+`genisoimage` is used to create the initial DMG. It is not deterministic as-is, so it has been
+patched. A system `genisoimage` will work fine, but it will not be deterministic because
+the file-order will change between invocations. The patch can be seen here: [cdrkit-deterministic.patch](https://github.com/bitcoin/bitcoin/blob/master/depends/patches/native_cdrkit/cdrkit-deterministic.patch).
+No effort was made to fix this cleanly, so it likely leaks memory badly, however it's only used for
+a single invocation, so that's no real concern.
+
+`genisoimage` cannot compress DMGs, so afterwards, the DMG tool from the
+`libdmg-hfsplus` project is used to compress it. There are several bugs in this tool and its
+maintainer has seemingly abandoned the project.
+
+The DMG tool has the ability to create DMGs from scratch as well, but this functionality is
+broken. Only the compression feature is currently used. Ideally, the creation could be fixed
+and `genisoimage` would no longer be necessary.
+
+Background images and other features can be added to DMG files by inserting a
+`.DS_Store` before creation. This is generated by the script `contrib/macdeploy/custom_dsstore.py`.
+
+As of OS X 10.9 Mavericks, using an Apple-blessed key to sign binaries is a requirement in
+order to satisfy the new Gatekeeper requirements. Because this private key cannot be
+shared, we'll have to be a bit creative in order for the build process to remain somewhat
+deterministic. Here's how it works:
+
+- Builders use Gitian to create an unsigned release. This outputs an unsigned DMG which
+  users may choose to bless and run. It also outputs an unsigned app structure in the form
+  of a tarball, which also contains all of the tools that have been previously (deterministically)
+  built in order to create a final DMG.
+- The Apple keyholder uses this unsigned app to create a detached signature, using the
+  script that is also included there. Detached signatures are available.
+- Builders feed the unsigned app + detached signature back into Gitian. It uses the
+  pre-built tools to recombine the pieces into a deterministic DMG.
 

contrib/macdeploy/extract-osx-sdk.sh

@@ -8,7 +8,7 @@ set -e
 
 INPUTFILE="Xcode_7.3.1.dmg"
 HFSFILENAME="5.hfs"
-SDKDIR="Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.11.sdk"
+SDKDIR="Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk"
 
 7z x "${INPUTFILE}" "${HFSFILENAME}"
 SDKNAME="$(basename "${SDKDIR}")"

depends/hosts/darwin.mk

@@ -1,9 +1,8 @@
 OSX_MIN_VERSION=10.12
-OSX_SDK_VERSION=10.11
+OSX_SDK_VERSION=10.14
 OSX_SDK=$(SDK_PATH)/MacOSX$(OSX_SDK_VERSION).sdk
-LD64_VERSION=253.9
+darwin_CC=clang -target $(host) -mmacosx-version-min=$(OSX_MIN_VERSION) --sysroot $(OSX_SDK)
-darwin_CC=clang -target $(host) -mmacosx-version-min=$(OSX_MIN_VERSION) --sysroot $(OSX_SDK) -mlinker-version=$(LD64_VERSION)
+darwin_CXX=clang++ -target $(host) -mmacosx-version-min=$(OSX_MIN_VERSION) --sysroot $(OSX_SDK) -stdlib=libc++
-darwin_CXX=clang++ -target $(host) -mmacosx-version-min=$(OSX_MIN_VERSION) --sysroot $(OSX_SDK) -mlinker-version=$(LD64_VERSION) -stdlib=libc++
 
 darwin_CFLAGS=-pipe
 darwin_CXXFLAGS=$(darwin_CFLAGS)

depends/packages/native_cctools.mk

@@ -1,45 +1,55 @@
 package=native_cctools
-$(package)_version=807d6fd1be5d2224872e381870c0a75387fe05e6
+$(package)_version=3764b223c011574971ee3ae09ce968ba5dc2f00f
-$(package)_download_path=https://github.com/theuni/cctools-port/archive
+$(package)_download_path=https://github.com/tpoechtrager/cctools-port/archive
 $(package)_file_name=$($(package)_version).tar.gz
-$(package)_sha256_hash=a09c9ba4684670a0375e42d9d67e7f12c1f62581a27f28f7c825d6d7032ccc6a
+$(package)_sha256_hash=3e35907bf376269a844df08e03cbb43e345c88125374f2228e03724b5f9a2a04
 $(package)_build_subdir=cctools
-$(package)_clang_version=3.7.1
+$(package)_clang_version=6.0.1
-$(package)_clang_download_path=http://llvm.org/releases/$($(package)_clang_version)
+$(package)_clang_download_path=https://releases.llvm.org/$($(package)_clang_version)
 $(package)_clang_download_file=clang+llvm-$($(package)_clang_version)-x86_64-linux-gnu-ubuntu-14.04.tar.xz
 $(package)_clang_file_name=clang-llvm-$($(package)_clang_version)-x86_64-linux-gnu-ubuntu-14.04.tar.xz
-$(package)_clang_sha256_hash=99b28a6b48e793705228a390471991386daa33a9717cd9ca007fcdde69608fd9
+$(package)_clang_sha256_hash=fa5416553ca94a8c071a27134c094a5fb736fe1bd0ecc5ef2d9bc02754e1bef0
+
+$(package)_libtapi_version=3efb201881e7a76a21e0554906cf306432539cef
+$(package)_libtapi_download_path=https://github.com/tpoechtrager/apple-libtapi/archive
+$(package)_libtapi_download_file=$($(package)_libtapi_version).tar.gz
+$(package)_libtapi_file_name=$($(package)_libtapi_version).tar.gz
+$(package)_libtapi_sha256_hash=380c1ca37cfa04a8699d0887a8d3ee1ad27f3d08baba78887c73b09485c0fbd3
+
 $(package)_extra_sources=$($(package)_clang_file_name)
+$(package)_extra_sources += $($(package)_libtapi_file_name)
 
 define $(package)_fetch_cmds
 $(call fetch_file,$(package),$($(package)_download_path),$($(package)_download_file),$($(package)_file_name),$($(package)_sha256_hash)) && \
-$(call fetch_file,$(package),$($(package)_clang_download_path),$($(package)_clang_download_file),$($(package)_clang_file_name),$($(package)_clang_sha256_hash))
+$(call fetch_file,$(package),$($(package)_clang_download_path),$($(package)_clang_download_file),$($(package)_clang_file_name),$($(package)_clang_sha256_hash)) && \
+$(call fetch_file,$(package),$($(package)_libtapi_download_path),$($(package)_libtapi_download_file),$($(package)_libtapi_file_name),$($(package)_libtapi_sha256_hash))
 endef
 
 define $(package)_extract_cmds
   mkdir -p $($(package)_extract_dir) && \
   echo "$($(package)_sha256_hash)  $($(package)_source)" > $($(package)_extract_dir)/.$($(package)_file_name).hash && \
   echo "$($(package)_clang_sha256_hash)  $($(package)_source_dir)/$($(package)_clang_file_name)" >> $($(package)_extract_dir)/.$($(package)_file_name).hash && \
+  echo "$($(package)_libtapi_sha256_hash)  $($(package)_source_dir)/$($(package)_libtapi_file_name)" >> $($(package)_extract_dir)/.$($(package)_file_name).hash && \
   $(build_SHA256SUM) -c $($(package)_extract_dir)/.$($(package)_file_name).hash && \
-  mkdir -p toolchain/bin toolchain/lib/clang/3.5/include && \
+  mkdir -p toolchain/bin toolchain/lib/clang/$($(package)_clang_version)/include && \
+  mkdir -p libtapi && \
+  tar --no-same-owner --strip-components=1 -C libtapi -xf $($(package)_source_dir)/$($(package)_libtapi_file_name) && \
   tar --no-same-owner --strip-components=1 -C toolchain -xf $($(package)_source_dir)/$($(package)_clang_file_name) && \
   rm -f toolchain/lib/libc++abi.so* && \
-  echo "#!/bin/sh" > toolchain/bin/$(host)-dsymutil && \
-  echo "exit 0" >> toolchain/bin/$(host)-dsymutil && \
-  chmod +x toolchain/bin/$(host)-dsymutil && \
   tar --no-same-owner --strip-components=1 -xf $($(package)_source)
 endef
 
 define $(package)_set_vars
-$(package)_config_opts=--target=$(host) --disable-lto-support
+  $(package)_config_opts=--target=$(host) --disable-lto-support --with-libtapi=$($(package)_extract_dir)
   $(package)_ldflags+=-Wl,-rpath=\\$$$$$$$$\$$$$$$$$ORIGIN/../lib
   $(package)_cc=$($(package)_extract_dir)/toolchain/bin/clang
   $(package)_cxx=$($(package)_extract_dir)/toolchain/bin/clang++
 endef
 
 define $(package)_preprocess_cmds
-  cd $($(package)_build_subdir); ./autogen.sh && \
+  CC=$($(package)_cc) CXX=$($(package)_cxx) INSTALLPREFIX=$($(package)_extract_dir) ./libtapi/build.sh && \
-  sed -i.old "/define HAVE_PTHREADS/d" ld64/src/ld/InputFiles.h
+  CC=$($(package)_cc) CXX=$($(package)_cxx) INSTALLPREFIX=$($(package)_extract_dir) ./libtapi/install.sh && \
+  sed -i.old "/define HAVE_PTHREADS/d" $($(package)_build_subdir)/ld64/src/ld/InputFiles.h
 endef
 
 define $(package)_config_cmds
@@ -52,6 +62,9 @@ endef
 
 define $(package)_stage_cmds
   $(MAKE) DESTDIR=$($(package)_staging_dir) install && \
+  mkdir -p $($(package)_staging_prefix_dir)/lib/ && \
+  cd $($(package)_extract_dir) && \
+  cp lib/libtapi.so.6 $($(package)_staging_prefix_dir)/lib/ && \
   cd $($(package)_extract_dir)/toolchain && \
   mkdir -p $($(package)_staging_prefix_dir)/lib/clang/$($(package)_clang_version)/include && \
   mkdir -p $($(package)_staging_prefix_dir)/bin $($(package)_staging_prefix_dir)/include && \

depends/packages/qt.mk

@@ -93,7 +93,6 @@ $(package)_config_opts_darwin += -device-option MAC_SDK_VERSION=$(OSX_SDK_VERSIO
 $(package)_config_opts_darwin += -device-option CROSS_COMPILE="$(host)-"
 $(package)_config_opts_darwin += -device-option MAC_MIN_VERSION=$(OSX_MIN_VERSION)
 $(package)_config_opts_darwin += -device-option MAC_TARGET=$(host)
-$(package)_config_opts_darwin += -device-option MAC_LD64_VERSION=$(LD64_VERSION)
 endif
 
 # for macOS on Apple Silicon (ARM) see https://bugreports.qt.io/browse/QTBUG-85279

depends/patches/qt/mac-qmake.conf

@@ -18,7 +18,7 @@ QMAKE_APPLE_DEVICE_ARCHS=x86_64
 !host_build: QMAKE_CFLAGS += -target $${MAC_TARGET}
 !host_build: QMAKE_OBJECTIVE_CFLAGS += $$QMAKE_CFLAGS
 !host_build: QMAKE_CXXFLAGS += $$QMAKE_CFLAGS
-!host_build: QMAKE_LFLAGS += -target $${MAC_TARGET} -mlinker-version=$${MAC_LD64_VERSION}
+!host_build: QMAKE_LFLAGS += -target $${MAC_TARGET}
 QMAKE_AR = $${CROSS_COMPILE}ar cq
 QMAKE_RANLIB=$${CROSS_COMPILE}ranlib
 QMAKE_LIBTOOL=$${CROSS_COMPILE}libtool

doc/build-cross.md

@@ -19,8 +19,8 @@ Additionally, the Mac OSX SDK must be downloaded and extracted manually:
 ```bash
 $ mkdir -p depends/sdk-sources
 $ mkdir -p depends/SDKs
-$ curl https://bitcoincore.org/depends-sources/sdks/MacOSX10.11.sdk.tar.gz -o depends/sdk-sources/MacOSX10.11.sdk.tar.gz
+$ curl https://bitcoincore.org/depends-sources/sdks/MacOSX10.14.sdk.tar.gz -o depends/sdk-sources/MacOSX10.14.sdk.tar.gz
-$ tar -C depends/SDKs -xf depends/sdk-sources/MacOSX10.11.sdk.tar.gz
+$ tar -C depends/SDKs -xf depends/sdk-sources/MacOSX10.14.sdk.tar.gz
 ```
 
 When building the dependencies, as described in [build-generic](build-generic.md), use

doc/build-osx.md

@@ -69,49 +69,3 @@ Other commands:
     ./src/dashd -daemon # Starts the dash daemon.
     ./src/dash-cli --help # Outputs a list of command-line options.
     ./src/dash-cli help # Outputs a list of RPC commands when the daemon is running.
-
-Deterministic macOS DMG Notes.
-
-Working macOS DMGs are created in Linux by combining a recent clang, the Apple binutils (ld, ar, etc) and DMG authoring tools.
-
-Apple uses clang extensively for development and has upstreamed the necessary functionality so that a vanilla clang can take advantage. It supports the use of -F, -target, -mmacosx-version-min, and --sysroot, which are all necessary when building for macOS.
-
-Apple's version of binutils (called cctools) contains lots of functionality missing in the FSF's binutils. In addition to extra linker options for frameworks and sysroots, several other tools are needed as well such as install_name_tool, lipo, and nmedit. These do not build under linux, so they have been patched to do so. The work here was used as a starting point: mingwandroid/toolchain4.
-
-In order to build a working toolchain, the following source packages are needed from Apple: cctools, dyld, and ld64.
-
-These tools inject timestamps by default, which produce non-deterministic binaries. The ZERO_AR_DATE environment variable is used to disable that.
-
-This version of cctools has been patched to use the current version of clang's headers and its libLTO.so rather than those from llvmgcc, as it was originally done in toolchain4.
-
-To complicate things further, all builds must target an Apple SDK. These SDKs are free to download, but not redistributable. To obtain it, register for a developer account, then download the Xcode 7.3.1 dmg.
-
-This file is several gigabytes in size, but only a single directory inside is needed:
-
-Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.11.sdk
-Unfortunately, the usual linux tools (7zip, hpmount, loopback mount) are incapable of opening this file. To create a tarball suitable for Gitian input, there are two options:
-
-Using macOS, you can mount the dmg, and then create it with:
-
-$ hdiutil attach Xcode_7.3.1.dmg
-$ tar -C /Volumes/Xcode/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/ -czf MacOSX10.11.sdk.tar.gz MacOSX10.11.sdk
-Alternatively, you can use 7zip and SleuthKit to extract the files one by one. The script contrib/macdeploy/extract-osx-sdk.sh automates this. First ensure the dmg file is in the current directory, and then run the script. You may wish to delete the intermediate 5.hfs file and MacOSX10.11.sdk (the directory) when you've confirmed the extraction succeeded.
-
-apt-get install p7zip-full sleuthkit
-contrib/macdeploy/extract-osx-sdk.sh
-rm -rf 5.hfs MacOSX10.11.sdk
-The Gitian descriptors build 2 sets of files: Linux tools, then Apple binaries which are created using these tools. The build process has been designed to avoid including the SDK's files in Gitian's outputs. All interim tarballs are fully deterministic and may be freely redistributed.
-
-genisoimage is used to create the initial DMG. It is not deterministic as-is, so it has been patched. A system genisoimage will work fine, but it will not be deterministic because the file-order will change between invocations. The patch can be seen here: theuni/osx-cross-depends. No effort was made to fix this cleanly, so it likely leaks memory badly. But it's only used for a single invocation, so that's no real concern.
-
-genisoimage cannot compress DMGs, so afterwards, the 'dmg' tool from the libdmg-hfsplus project is used to compress it. There are several bugs in this tool and its maintainer has seemingly abandoned the project. It has been forked and is available (with fixes) here: theuni/libdmg-hfsplus.
-
-The 'dmg' tool has the ability to create DMGs from scratch as well, but this functionality is broken. Only the compression feature is currently used. Ideally, the creation could be fixed and genisoimage would no longer be necessary.
-
-Background images and other features can be added to DMG files by inserting a .DS_Store before creation. This is generated by the script contrib/macdeploy/custom_dsstore.py.
-
-As of OS X 10.9 Mavericks, using an Apple-blessed key to sign binaries is a requirement in order to satisfy the new Gatekeeper requirements. Because this private key cannot be shared, we'll have to be a bit creative in order for the build process to remain somewhat deterministic. Here's how it works:
-
-Builders use Gitian to create an unsigned release. This outputs an unsigned dmg which users may choose to bless and run. It also outputs an unsigned app structure in the form of a tarball, which also contains all of the tools that have been previously (deterministically) built in order to create a final dmg.
-The Apple keyholder uses this unsigned app to create a detached signature, using the script that is also included there. Detached signatures are available from this repository.
-Builders feed the unsigned app + detached signature back into Gitian. It uses the pre-built tools to recombine the pieces into a deterministic dmg.