103 lines
3.1 KiB
Docker
103 lines
3.1 KiB
Docker
FROM golang:1.25 AS gomail-builder
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ARG TARGETARCH=amd64
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ARG TARGETOS=linux
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WORKDIR /gomail
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RUN { \
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echo 'package main'; \
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echo ''; \
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echo 'import ('; \
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echo ' "flag"'; \
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echo ' "fmt"'; \
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echo ' "io"'; \
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echo ' "net/smtp"'; \
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echo ' "os"'; \
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echo ')'; \
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echo ''; \
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echo 'func main() {'; \
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echo ' from := flag.String("f", "minitor@localhost", "envelope sender")'; \
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echo ' flag.Parse()'; \
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echo ' recipients := flag.Args()'; \
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echo ''; \
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echo ' if len(recipients) == 0 {'; \
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echo ' fmt.Fprintln(os.Stderr, "usage: sendmail [-f sender] recipient...")'; \
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echo ' os.Exit(1)'; \
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echo ' }'; \
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echo ''; \
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echo ' body, err := io.ReadAll(os.Stdin)'; \
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echo ' if err != nil {'; \
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echo ' fmt.Fprintln(os.Stderr, err)'; \
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echo ' os.Exit(1)'; \
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echo ' }'; \
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echo ''; \
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echo ' relay := os.Getenv("SMTP_RELAY")'; \
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echo ' if relay == "" {'; \
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echo ' relay = "172.17.0.2"'; \
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echo ' }'; \
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echo ''; \
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echo ' port := os.Getenv("SMTP_PORT")'; \
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echo ' if port == "" {'; \
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echo ' port = "25"'; \
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echo ' }'; \
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echo ''; \
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echo ' sender := os.Getenv("SMTP_SENDER")'; \
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echo ' if sender == "" {'; \
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echo ' sender = *from'; \
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echo ' }'; \
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echo ''; \
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echo ' debug := os.Getenv("DEBUG") != ""'; \
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echo ' if debug {'; \
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echo ' fmt.Fprintf(os.Stderr, "[sendmail] relay=%s port=%s sender=%s recipients=%v\n", relay, port, sender, recipients)'; \
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echo ' fmt.Fprintf(os.Stderr, "[sendmail] body:\n%s\n", body)'; \
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echo ' }'; \
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echo ''; \
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echo ' if err = smtp.SendMail(relay+":"+port, nil, sender, recipients, body); err != nil {'; \
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echo ' fmt.Fprintln(os.Stderr, err)'; \
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echo ' os.Exit(1)'; \
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echo ' }'; \
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echo ' if debug {'; \
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echo ' fmt.Fprintln(os.Stderr, "[sendmail] sent successfully")'; \
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echo ' }'; \
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echo '}'; \
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} > main.go
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RUN go mod init gomail && \
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CGO_ENABLED=0 GOOS=${TARGETOS} GOARCH=${TARGETARCH} go build -o /usr/local/bin/sendmail .
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FROM golang:1.25 AS builder
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WORKDIR /app
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COPY ./go.mod ./go.sum /app/
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RUN go mod download
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COPY ./*.go /app/
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RUN rm -f /app/gomail.go
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ARG TARGETARCH=amd64
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ARG TARGETOS=linux
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ARG VERSION=dev
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RUN CGO_ENABLED=0 GOOS=${TARGETOS} GOARCH=${TARGETARCH} go build -ldflags "-X main.version=${VERSION}" -a -installsuffix nocgo -o minitor .
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FROM alpine:3.23
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RUN mkdir /app
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WORKDIR /app/
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# Copy minitor in
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COPY --from=builder /app/minitor .
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# Copy sendmail (gomail) in
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COPY --from=gomail-builder /usr/local/bin/sendmail /usr/local/bin/sendmail
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# Add common checking tools
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# hadolint ignore=DL3018
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RUN apk --no-cache add bash=~5 curl=~8 jq=~1 bind-tools=~9 tzdata
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# Add minitor user for running as non-root
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RUN addgroup -S minitor && adduser -S minitor -G minitor
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# Copy scripts
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COPY ./scripts /app/scripts
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COPY default_config.hcl /app/config.hcl
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RUN chmod -R 755 /app/scripts
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# Drop to non-root user
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USER minitor
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ENTRYPOINT [ "./minitor" ] |