Reproducible buildsystem

[alessio]

This aims to provide a simple Docker-based mechanism for application
developers to provide reproducible builds. Unlike gaia's current
reproducible buildsystem, this does not depend on external tools,
e.g. gitian-builder.

build-simd-linux now builds simd in a deterministic Linux container.

---

Before we can merge this PR, please make sure that all the following items have been
checked off. If any of the checklist items are not applicable, please leave them but
write a little note why.

• Targeted PR against correct branch (see CONTRIBUTING.md)
• Linked to Github issue with discussion and accepted design OR link to spec that describes this work.
• Code follows the module structure standards.
• Wrote unit and integration tests
• Updated relevant documentation (docs/) or specification (x/<module>/spec/)
• Added relevant godoc comments.
• Added a relevant changelog entry to the Unreleased section in CHANGELOG.md
• Re-reviewed Files changed in the Github PR explorer
• Review Codecov Report in the comment section below once CI passes

[tac0turtle]

utACK. Love this new update. Does this mean we will be removing gitian?

[alessio]

@marbar3778 dixit:

Does this mean we will be removing gitian?

Yes, the ultimate objective of this is removing gitian altogether. Juicy and sweet extra bit: this buildsystem is actually much faster than the old gitian-based one.

[alessio]

@marbar3778 building an app is even easier now - look at build.sh for an example

[faddat]

What exactly is simd?

ledger enabled means using cgo, correct?

[codecov]

Codecov Report

Merging #7247 into master will decrease coverage by 5.76%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #7247      +/-   ##
==========================================
- Coverage   56.22%   50.46%   -5.77%     
==========================================
  Files         584      284     -300     
  Lines       40515    20451   -20064     
==========================================
- Hits        22781    10320   -12461     
+ Misses      15816     9298    -6518     
+ Partials     1918      833    -1085     

[cebi1992]

#!/bin/bash

set -ue

Expect the following envvars to be set:

- APP

- VERSION

- COMMIT

- TARGET_OS

- LEDGER_ENABLED

- DEBUG

Source builder's functions library

. /usr/local/share/tendermint/buildlib.sh

These variables are now available

- BASEDIR

- OUTDIR

Build for each os-architecture pair

for platform in ${TARGET_PLATFORMS} ; do
# This function sets GOOS, GOARCH, and OS_FILE_EXT environment variables
# according to the build target platform. OS_FILE_EXT is empty in all
# cases except when the target platform is 'windows'.
setup_build_env_for_platform "${platform}"

make clean
echo Building for $(go env GOOS)/$(go env GOARCH) >&2
GOROOT_FINAL="$(go env GOROOT)" \
make build \
    LDFLAGS=-buildid=${VERSION} \
    VERSION=${VERSION} \
    COMMIT=${COMMIT} \
    LEDGER_ENABLED=${LEDGER_ENABLED}
mv ./build/${APP}${OS_FILE_EXT} ${OUTDIR}/${APP}-${VERSION}-$(go env GOOS)-$(go env GOARCH)${OS_FILE_EXT}

# This function restore the build environment variables to their
# original state.
restore_build_env

done

Generate and display build report.

generate_build_report
cat ${OUTDIR}/build_report