chore: add Compose stack with live reload and Kind cluster bootstrap

.air.toml

@@ -0,0 +1,56 @@
+root = "."
+testdata_dir = "testdata"
+tmp_dir = "tmp"
+
+[build]
+args_bin = [
+    "--watch-kube-secrets",
+    "--kubeconfig=/app/kubeconfig.yaml",
+    "--expose-per-cert-error-metrics",
+]
+bin = "tmp/x509-certificate-exporter"
+cmd = "hack/air-build-server.sh"
+delay = 1000
+exclude_dir = ["hack", "testdata", "tmp", "vendor"]
+exclude_file = []
+exclude_regex = ["_test.go"]
+exclude_unchanged = false
+follow_symlink = false
+full_bin = ""
+include_dir = []
+include_ext = ["go", "tpl", "tmpl", "html"]
+include_file = []
+kill_delay = "0s"
+log = "build-errors.log"
+poll = false
+poll_interval = 0
+post_cmd = []
+pre_cmd = []
+rerun = false
+rerun_delay = 500
+send_interrupt = false
+stop_on_error = true
+
+[color]
+app = ""
+build = "yellow"
+main = "magenta"
+runner = "green"
+watcher = "cyan"
+
+[log]
+main_only = false
+silent = false
+time = false
+
+[misc]
+clean_on_exit = false
+
+[proxy]
+app_port = 0
+enabled = false
+proxy_port = 0
+
+[screen]
+clear_on_rebuild = false
+keep_scroll = true

.env

@@ -0,0 +1,2 @@
+USER_ID=1000
+GROUP_ID=1000

.gitignore

@@ -1,6 +1,14 @@
-__pycache__
-*.pyc
+*.out
+*.so
+*.dylib
+*.exe
+*.exe~
+*.dll
+*.test
 *.cov
 *.debug
+*.kubeconfig.yaml
+kubeconfig.yaml
 coverage.html
-/kubeconfig*
+/vendor
+/tmp

Dockerfile

@@ -1,43 +1,48 @@
-## Build Stage
+FROM --platform=$BUILDPLATFORM golang:1.23.4 AS base
+WORKDIR /app
 
-# https://github.com/hadolint/hadolint/issues/861
-# hadolint ignore=DL3029
-FROM --platform=${BUILDPLATFORM:-linux/amd64} golang:1.23.4-alpine as build
+FROM --platform=$BUILDPLATFORM cosmtrek/air:v1.61.5 AS air
 
-WORKDIR $GOPATH/src/github.com/enix/x509-certificate-exporter
+FROM base AS dev
+ARG USER_ID=1000
+ARG GROUP_ID=1000
+RUN groupadd -g ${GROUP_ID} air \
+    && useradd -l -u ${USER_ID} -g air air \
+    && install -d -m 0700 -o air -g air /home/air
+USER ${USER_ID}:${GROUP_ID}
+COPY --from=air /go/bin/air /go/bin/air
+CMD [ "/go/bin/air" ]
 
+FROM base AS build
 COPY go.mod go.mod
 COPY go.sum go.sum
-
-RUN go mod download
-
+RUN go mod download -x
 COPY internal internal
+# COPY pkg pkg
 COPY cmd cmd
-
-ARG VERSION="devel"
-ARG VCS_REF="unknown"
 ARG TARGETOS
 ARG TARGETARCH
-
+ARG VERSION="devel"
+ARG VCS_REF="unknown"
 ENV GOOS=${TARGETOS}
 ENV GOARCH=${TARGETARCH}
-
-RUN go build -v \
-  -tags netgo,osusergo \
-  -ldflags "-X \"github.com/enix/x509-certificate-exporter/v3/internal.Version=${VERSION}\" \
-            -X \"github.com/enix/x509-certificate-exporter/v3/internal.Revision=${VCS_REF}\" \
-            -X \"github.com/enix/x509-certificate-exporter/v3/internal.BuildDateTime=$(date -u -Iseconds)\"" \
-  ./cmd/x509-certificate-exporter
-
-
-## Production Stage
-
-# https://github.com/hadolint/hadolint/issues/861
-# hadolint ignore=DL3029
-FROM --platform=${TARGETPLATFORM:-linux/amd64} alpine:3.21.0
-
-COPY --from=build /go/src/github.com/enix/x509-certificate-exporter/x509-certificate-exporter /x509-certificate-exporter
-
+RUN go build -v -a -buildvcs=false \
+    -tags netgo,osusergo \
+    -ldflags " \
+    -X \"github.com/enix/x509-certificate-exporter/v3/internal.Version=${VERSION}\" \
+    -X \"github.com/enix/x509-certificate-exporter/v3/internal.Revision=${VCS_REF}\" \
+    -X \"github.com/enix/x509-certificate-exporter/v3/internal.BuildDateTime=$(date -u -Iseconds)\" \
+    " \
+    -o /x509-certificate-exporter \
+    ./cmd/x509-certificate-exporter
+FROM scratch AS distroless
+COPY --from=build --chown=0:0 --chmod=0555 /x509-certificate-exporter /x509-certificate-exporter
+USER 65534:65534
+EXPOSE 9793/tcp
+ENTRYPOINT [ "/x509-certificate-exporter" ]
+
+FROM cgr.dev/chainguard/wolfi-base:latest@sha256:3b271f8bff9356a38aa23118ffdea3c0d659f39e207feedacf01bdea4b900871
+COPY --from=build --chown=0:0 --chmod=0555 /x509-certificate-exporter /x509-certificate-exporter
+USER nobody:nobody
 EXPOSE 9793/tcp
-
 ENTRYPOINT [ "/x509-certificate-exporter" ]

docker-compose.yml

@@ -0,0 +1,12 @@
+services:
+  app:
+    build:
+      context: .
+      target: dev
+      args:
+        USER_ID: ${USER_ID:-1000}
+        GROUP_ID: ${GROUP_ID:-1000}
+    user: ${USER_ID:-1000}:${GROUP_ID:-1000}
+    network_mode: "host"
+    volumes:
+      - .:/app:z

hack/air-build-server.sh

@@ -0,0 +1,21 @@
+#!/bin/bash
+
+set -o errexit
+set -o nounset
+set -o pipefail
+
+export CGO_ENABLED=0
+export GO111MODULE=on
+export GOFLAGS="-mod=vendor"
+
+MODULE=$(go list -m)
+
+LDFLAGS=()
+LDFLAGS+=" -X ${MODULE}/internal/internal.Version=$(git describe --tags --always --dirty)"
+LDFLAGS+=" -X ${MODULE}/internal/internal.BuildDateTime=$(date --iso-8601=seconds)"
+LDFLAGS+=" -X ${MODULE}/internal/internal.Revision=$(git rev-parse HEAD)"
+
+go build \
+    -ldflags "${LDFLAGS[*]}" \
+    -o ./tmp/x509-certificate-exporter \
+    ./cmd/x509-certificate-exporter

hack/kind.sh

@@ -0,0 +1,26 @@
+#!/bin/bash
+
+# This script should be somewhat idempotent
+
+[ -d hack ] || {
+  echo "Run this script from the project root with: ./hack/$(basename $0)" >&2
+  exit 1
+}
+
+set -xe
+
+. .env
+
+# create the Kind cluster
+C="${KIND_NAME:-x509}"
+kind create cluster -n "$C" || true
+CTX="kind-$C"
+K="kubectl --context $CTX"
+$K cluster-info
+
+# wait for nodes to be Ready
+$K wait --timeout=1h --for=condition=Ready=true node -l node-role.kubernetes.io/control-plane
+sleep 2
+
+# get kubeconfig
+kind get kubeconfig --name $C > kubeconfig.yaml