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130 lines
4.8 KiB
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130 lines
4.8 KiB
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Developer Information
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#####################
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Reproducible Builds
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*******************
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This section describes how to reproduce the official released binaries for
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restic for version 0.10.0 and later. For restic versions down to 0.9.3 please
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refer to the documentation for the respective version. The binary produced
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depends on the following things:
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* The source code for the release
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* The exact version of the official `Go compiler <https://go.dev>`__ used to produce the binaries (running ``restic version`` will print this)
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* The architecture and operating system the Go compiler runs on (Linux, ``amd64``)
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* The build tags (for official binaries, it's the tag ``selfupdate``)
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* The path where the source code is extracted to (``/restic``)
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* The path to the Go compiler (``/usr/local/go``)
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* The path to the Go workspace (``GOPATH=/home/build/go``)
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* Other environment variables (mostly ``$GOOS``, ``$GOARCH``, ``$CGO_ENABLED``)
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In addition, The compressed ZIP files for Windows depends on the modification
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timestamp and filename of the binary contained in it. In order to reproduce the
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exact same ZIP file every time, we update the timestamp of the file ``VERSION``
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in the source code archive and set the timezone to Europe/Berlin.
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In the following example, we'll use the file ``restic-0.14.0.tar.gz`` and Go
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1.19 to reproduce the released binaries.
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1. Determine the Go compiler version used to build the released binaries, then download and extract the Go compiler into ``/usr/local/go``:
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.. code::
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$ restic version
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restic 0.14.0 compiled with go1.19 on linux/amd64
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$ cd /usr/local
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$ curl -L https://dl.google.com/go/go1.19.linux-amd64.tar.gz | tar xz
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2. Extract the restic source code into ``/restic``
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.. code::
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$ mkdir /restic
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$ cd /restic
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$ TZ=Europe/Berlin curl -L https://github.com/restic/restic/releases/download/v0.14.0/restic-0.14.0.tar.gz | tar xz --strip-components=1
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3. Build the binaries for Windows and Linux:
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.. code::
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$ export PATH=/usr/local/go/bin:$PATH
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$ export GOPATH=/home/build/go
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$ go version
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go version go1.19 linux/amd64
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$ GOOS=linux GOARCH=amd64 CGO_ENABLED=0 go build -ldflags "-s -w" -tags selfupdate -o restic_linux_amd64 ./cmd/restic
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$ bzip2 restic_linux_amd64
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$ GOOS=windows GOARCH=amd64 CGO_ENABLED=0 go build -ldflags "-s -w" -tags selfupdate -o restic_0.14.0_windows_amd64.exe ./cmd/restic
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$ touch --reference VERSION restic_0.14.0_windows_amd64.exe
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$ TZ=Europe/Berlin zip -q -X restic_0.14.0_windows_amd64.zip restic_0.14.0_windows_amd64.exe
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Building the Official Binaries
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******************************
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The released binaries for restic are built using a Docker container. You can
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find it on `Docker Hub <https://hub.docker.com/r/restic/builder>`__ as
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``restic/builder``, the ``Dockerfile`` and instructions on how to build the
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container can be found in the `GitHub repository
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<https://github.com/restic/builder>`__
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The container serves the following goals:
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* Have a very controlled environment which is independent from the local system
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* Make it easy to have the correct version of the Go compiler at the right path
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* Make it easy to pass in the source code to build at a well-defined path
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The following steps are necessary to build the binaries:
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1. Either build the container (see the instructions in the `repository's README <https://github.com/restic/builder>`__). Alternatively, download the container from the hub:
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.. code::
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docker pull restic/builder
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2. Extract the source code somewhere:
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.. code::
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tar xvzf restic-0.14.0.tar.gz
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3. Create a directory to place the resulting binaries in:
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.. code::
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mkdir output
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3. Mount the source code and the output directory in the container and run the default command, which starts ``helpers/build-release-binaries/main.go``:
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.. code::
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docker run --rm \
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--volume "$PWD/restic-0.14.0:/restic" \
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--volume "$PWD/output:/output" \
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restic/builder \
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go run helpers/build-release-binaries/main.go --version 0.14.0
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4. If anything goes wrong, you can enable debug output like this:
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.. code::
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docker run --rm \
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--volume "$PWD/restic-0.14.0:/restic" \
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--volume "$PWD/output:/output" \
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restic/builder \
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go run helpers/build-release-binaries/main.go --version 0.14.0 --verbose
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Prepare a New Release
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*********************
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Publishing a new release of restic requires many different steps. We've
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automated this in the Go program ``helpers/prepare-release/main.go`` which also
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includes checking that e.g. the changelog is correctly generated. The only
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required argument is the new version number (in `Semantic Versioning
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<https://semver.org/>`__ format ``MAJOR.MINOR.PATCH``):
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.. code::
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go run helpers/prepare-release/main.go 0.14.0
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Checks can be skipped on demand via flags, please see ``--help`` for details.
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