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101 lines
4.6 KiB
101 lines
4.6 KiB
#!/usr/bin/env bash
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export LC_ALL=C
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set -e -o pipefail
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# Determine the maximum number of jobs to run simultaneously (overridable by
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# environment)
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MAX_JOBS="${MAX_JOBS:-$(nproc)}"
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# Download the depends sources now as we won't have internet access in the build
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# container
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make -C "${PWD}/depends" -j"$MAX_JOBS" download ${V:+V=1} ${SOURCES_PATH:+SOURCES_PATH="$SOURCES_PATH"}
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# Determine the reference time used for determinism (overridable by environment)
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SOURCE_DATE_EPOCH="${SOURCE_DATE_EPOCH:-$(git log --format=%at -1)}"
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# Execute "$@" in a pinned, possibly older version of Guix, for reproducibility
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# across time.
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time-machine() {
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guix time-machine --url=https://github.com/dongcarl/guix.git \
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--commit=b3a7c72c8b2425f8ddb0fc6e3b1caeed40f86dee \
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-- "$@"
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}
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# Deterministically build Bitcoin Core for HOSTs (overriable by environment)
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for host in ${HOSTS=x86_64-linux-gnu arm-linux-gnueabihf aarch64-linux-gnu riscv64-linux-gnu x86_64-w64-mingw32}; do
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# Display proper warning when the user interrupts the build
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trap 'echo "** INT received while building ${host}, you may want to clean up the relevant output and distsrc-* directories before rebuilding"' INT
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(
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# Required for 'contrib/guix/manifest.scm' to output the right manifest
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# for the particular $HOST we're building for
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export HOST="$host"
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# Run the build script 'contrib/guix/libexec/build.sh' in the build
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# container specified by 'contrib/guix/manifest.scm'.
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#
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# Explanation of `guix environment` flags:
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#
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# --container run command within an isolated container
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#
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# Running in an isolated container minimizes build-time differences
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# between machines and improves reproducibility
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#
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# --pure unset existing environment variables
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#
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# Same rationale as --container
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#
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# --no-cwd do not share current working directory with an
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# isolated container
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#
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# When --container is specified, the default behavior is to share
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# the current working directory with the isolated container at the
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# same exact path (e.g. mapping '/home/satoshi/bitcoin/' to
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# '/home/satoshi/bitcoin/'). This means that the $PWD inside the
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# container becomes a source of irreproducibility. --no-cwd disables
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# this behaviour.
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#
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# --share=SPEC for containers, share writable host file system
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# according to SPEC
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#
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# --share="$PWD"=/bitcoin
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#
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# maps our current working directory to /bitcoin
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# inside the isolated container, which we later cd
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# into.
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#
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# While we don't want to map our current working directory to the
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# same exact path (as this introduces irrepreducibility), we do want
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# it to be at a _fixed_ path _somewhere_ inside the isolated
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# container so that we have something to build. '/bitcoin' was
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# chosen arbitrarily.
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#
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# ${SOURCES_PATH:+--share="$SOURCES_PATH"}
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#
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# make the downloaded depends sources path available
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# inside the isolated container
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#
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# The isolated container has no network access as it's in a
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# different network namespace from the main machine, so we have to
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# make the downloaded depends sources available to it. The sources
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# should have been downloaded prior to this invocation.
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#
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# shellcheck disable=SC2086
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time-machine environment --manifest="${PWD}/contrib/guix/manifest.scm" \
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--container \
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--pure \
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--no-cwd \
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--share="$PWD"=/bitcoin \
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${SOURCES_PATH:+--share="$SOURCES_PATH"} \
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${ADDITIONAL_GUIX_ENVIRONMENT_FLAGS} \
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-- env HOST="$host" \
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MAX_JOBS="$MAX_JOBS" \
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SOURCE_DATE_EPOCH="${SOURCE_DATE_EPOCH:?unable to determine value}" \
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${V:+V=1} \
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${SOURCES_PATH:+SOURCES_PATH="$SOURCES_PATH"} \
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bash -c "cd /bitcoin && bash contrib/guix/libexec/build.sh"
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)
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done
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