Automate release process

.github/workflows/release.yml

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+name: release
+
+on: push
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Release
+        uses: softprops/action-gh-release@v1
+        if: startsWith(github.ref, 'refs/tags/')
+        with:
+          body: Check CHANGELOG.md for details

RELEASING.md

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+# Releasing
+
+1. Run `release.sh` script which updates versions in go.mod files and pushes a new branch to GitHub:
+
+```shell
+./scripts/release.sh -t v1.0.0
+```
+
+2. Open a pull request and wait for the build to finish.
+
+3. Merge the pull request and run `tag.sh` to create tags for packages:
+
+```shell
+./scripts/tag.sh -t v1.0.0
+```
+
+4. Push the tags:
+
+```shell
+git push origin --tags
+```

scripts/release.sh

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+#!/bin/bash
+
+set -e
+
+help() {
+    cat <<- EOF
+Usage: TAG=tag $0
+
+Updates version in go.mod files and pushes a new brash to GitHub.
+
+VARIABLES:
+  TAG        git tag, for example, v1.0.0
+EOF
+    exit 0
+}
+
+if [ -z "$TAG" ]
+then
+    printf "TAG is required\n\n"
+    help
+fi
+
+TAG_REGEX="^v(0|[1-9][0-9]*)\\.(0|[1-9][0-9]*)\\.(0|[1-9][0-9]*)(\\-[0-9A-Za-z-]+(\\.[0-9A-Za-z-]+)*)?(\\+[0-9A-Za-z-]+(\\.[0-9A-Za-z-]+)*)?$"
+if ! [[ "${TAG}" =~ ${TAG_REGEX} ]]; then
+    printf "TAG is not valid: ${TAG}\n\n"
+    exit 1
+fi
+
+TAG_FOUND=`git tag --list ${TAG}`
+if [[ ${TAG_FOUND} = ${TAG} ]] ; then
+    printf "tag ${TAG} already exists\n\n"
+    exit 1
+fi
+
+if ! git diff --quiet
+then
+    printf "working tree is not clean\n\n"
+    git status
+    exit 1
+fi
+
+git checkout master
+
+PACKAGE_DIRS=$(find . -mindepth 2 -type f -name 'go.mod' -exec dirname {} \; \
+  | sed 's/^\.\///' \
+  | sort)
+
+for dir in $PACKAGE_DIRS
+do
+    sed --in-place \
+      "s/uptrace\/bun\([^ ]*\) v.*/uptrace\/bun\1 ${TAG}/" "${dir}/go.mod"
+done
+
+for dir in $PACKAGE_DIRS
+do
+    printf "${dir}: go mod tidy\n"
+    (cd ./${dir} && go mod tidy)
+done
+
+sed --in-place "s/\(return \)\"[^\"]*\"/\1\"${TAG#v}\"/" ./version.go
+
+git checkout -b release/${TAG} master
+git add -u
+git commit -m "Release $TAG"
+git push origin release/${TAG}

scripts/tag.sh

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+#!/bin/bash
+
+set -e
+
+help() {
+    cat <<- EOF
+Usage: TAG=tag $0
+
+Creates git tags for public Go packages.
+
+VARIABLES:
+  TAG        git tag, for example, v1.0.0
+EOF
+    exit 0
+}
+
+if [ -z "$TAG" ]
+then
+    printf "TAG env var is required\n\n";
+    help
+fi
+
+if ! grep -Fq "\"${TAG#v}\"" version.go
+then
+    printf "version.go does not contain ${TAG#v}\n"
+    exit 1
+fi
+
+PACKAGE_DIRS=$(find . -mindepth 2 -type f -name 'go.mod' -exec dirname {} \; \
+  | grep -E -v "example|internal" \
+  | sed 's/^\.\///' \
+  | sort)
+
+git tag ${TAG}
+
+for dir in $PACKAGE_DIRS
+do
+    printf "tagging ${dir}/${TAG}\n"
+    git tag ${dir}/${TAG}
+done