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undocker/release

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#!/bin/bash
set -euo pipefail
err() {
>&2 echo "ERROR: $*"
exit 1
}
git status --porcelain | grep -q "" &&
err "working tree is dirty, commit your changes first."
# https://raimue.blog/2010/09/09/bash-for-loop-with-glob-patterns/
shopt -s nullglob
for file in sha256sum-*; do
err "found $file from previous release, delete it first"
done
shopt -u nullglob
[[ "$1" =~ ^v([0-9]+)\.([0-9]+)(\.([0-9]+))?$ ]] || \
err "arg1 accepts the following formats: v1.0 v1.0.0"
git tag | grep -q "^$1$" &&
err "tag $1 already exists"
last_tag=$(git tag | tail -1)
make -B -j"$(nproc)" VSN="$1" sha256sum-asc
{
echo undocker "$1"
echo
echo Changelog since "$last_tag":
git log --pretty=format:"- [%cn] %s" "$last_tag"..HEAD
echo
echo
echo sha256sums of released binaries:
cat sha256sum-*.txt
echo
} | git tag -u motiejus@jakstys.lt -F - "$1"