gh-ost/script/ensure-go-installed

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#!/bin/bash
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PREFERRED_GO_VERSION=go1.14.4
SUPPORTED_GO_VERSIONS='go1.1[456]'
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GO_PKG_DARWIN=${PREFERRED_GO_VERSION}.darwin-amd64.pkg
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GO_PKG_DARWIN_SHA=b518f21f823759ee30faddb1f623810a432499f050c9338777523d9c8551c62c
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GO_PKG_LINUX=${PREFERRED_GO_VERSION}.linux-amd64.tar.gz
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GO_PKG_LINUX_SHA=aed845e4185a0b2a3c3d5e1d0a35491702c55889192bb9c30e67a3de6849c067
export ROOTDIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )/.." && pwd )"
cd $ROOTDIR
# If Go isn't installed globally, setup environment variables for local install.
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if [ -z "$(which go)" ] || [ -z "$(go version | grep "$SUPPORTED_GO_VERSIONS")" ]; then
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GODIR="$ROOTDIR/.vendor/golocal"
if [ $(uname -s) = "Darwin" ]; then
export GOROOT="$GODIR/usr/local/go"
else
export GOROOT="$GODIR/go"
fi
export PATH="$GOROOT/bin:$PATH"
fi
# Check if local install exists, and install otherwise.
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if [ -z "$(which go)" ] || [ -z "$(go version | grep "$SUPPORTED_GO_VERSIONS")" ]; then
[ -d "$GODIR" ] && rm -rf $GODIR
mkdir -p "$GODIR"
cd "$GODIR";
if [ $(uname -s) = "Darwin" ]; then
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curl -L -O https://dl.google.com/go/$GO_PKG_DARWIN
shasum -a256 $GO_PKG_DARWIN | grep $GO_PKG_DARWIN_SHA
xar -xf $GO_PKG_DARWIN
cpio -i < com.googlecode.go.pkg/Payload
else
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curl -L -O https://dl.google.com/go/$GO_PKG_LINUX
shasum -a256 $GO_PKG_LINUX | grep $GO_PKG_LINUX_SHA
tar xf $GO_PKG_LINUX
fi
# Prove we did something right
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echo "$(go version) installed in $GODIR: Go Binary: $(which go)"
else
echo "$(go version) found in $GODIR: Go Binary: $(which go)"
fi
cd $ROOTDIR
# Configure the new go to be the first go found
export GOPATH=$ROOTDIR/.vendor