Merge pull request #11 from Icinga/feature/persistence-1

Persist config and state in /data

Dockerfile

@@ -1,6 +1,11 @@
 FROM icinga/icinga2-deps
 
-COPY --chown=icinga:icinga icinga2-bin/ /
+COPY icinga2-bin/ /
+
+RUN ["install", "-o", "icinga", "-g", "icinga", "-d", "/data"]
+VOLUME ["/data"]
+
+RUN ["bash", "-exo", "pipefail", "-c", "for d in /etc/icinga2 /var/*/icinga2; do mkdir -p $(dirname /data-init$d); mv $d /data-init$d; ln -vs /data$d $d; done"]
 
 USER icinga
 CMD ["icinga2", "daemon"]

deps.Dockerfile

@@ -1,3 +1,11 @@
+FROM golang:buster as entrypoint
+
+COPY entrypoint /entrypoint
+
+WORKDIR /entrypoint
+RUN ["go", "build", "."]
+
+
 FROM buildpack-deps:scm as clone
 SHELL ["/bin/bash", "-exo", "pipefail", "-c"]
 
@@ -51,9 +59,13 @@ FROM debian:buster-slim
 
 RUN ["/bin/bash", "-exo", "pipefail", "-c", "export DEBIAN_FRONTEND=noninteractive; apt-get update; apt-get install --no-install-{recommends,suggests} -y libboost-{context,coroutine,date-time,filesystem,program-options,regex,system,thread}1.67 libedit2 libmariadb3 libmoosex-role-timer-perl libpq5 libssl1.1 mailutils monitoring-plugins openssl postfix; apt-get clean; rm -vrf /var/lib/apt/lists/*"]
 
+COPY --from=entrypoint /entrypoint/entrypoint /entrypoint
+
 RUN ["adduser", "--system", "--group", "--home", "/var/lib/icinga2", "--disabled-login", "--force-badname", "--no-create-home", "icinga"]
 
 COPY --from=build /check_mssql_health/bin/ /
 COPY --from=build /check_nwc_health/bin/ /
 COPY --from=build /check_postgres/bin/ /
 COPY --from=clone /check_ssl_cert/check_ssl_cert /usr/lib/nagios/plugins/check_ssl_cert
+
+ENTRYPOINT ["/entrypoint"]

entrypoint/go.mod

@@ -0,0 +1,8 @@
+module entrypoint
+
+go 1.14
+
+require (
+	github.com/otiai10/copy v1.2.0
+	golang.org/x/crypto v0.0.0-20200604202706-70a84ac30bf9
+)

entrypoint/go.sum

@@ -0,0 +1,16 @@
+github.com/otiai10/copy v1.2.0 h1:HvG945u96iNadPoG2/Ja2+AUJeW5YuFQMixq9yirC+k=
+github.com/otiai10/copy v1.2.0/go.mod h1:rrF5dJ5F0t/EWSYODDu4j9/vEeYHMkc8jt0zJChqQWw=
+github.com/otiai10/curr v0.0.0-20150429015615-9b4961190c95/go.mod h1:9qAhocn7zKJG+0mI8eUu6xqkFDYS2kb2saOteoSB3cE=
+github.com/otiai10/curr v1.0.0 h1:TJIWdbX0B+kpNagQrjgq8bCMrbhiuX73M2XwgtDMoOI=
+github.com/otiai10/curr v1.0.0/go.mod h1:LskTG5wDwr8Rs+nNQ+1LlxRjAtTZZjtJW4rMXl6j4vs=
+github.com/otiai10/mint v1.3.0/go.mod h1:F5AjcsTsWUqX+Na9fpHb52P8pcRX2CI6A3ctIT91xUo=
+github.com/otiai10/mint v1.3.1 h1:BCmzIS3n71sGfHB5NMNDB3lHYPz8fWSkCAErHed//qc=
+github.com/otiai10/mint v1.3.1/go.mod h1:/yxELlJQ0ufhjUwhshSj+wFjZ78CnZ48/1wtmBH1OTc=
+golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
+golang.org/x/crypto v0.0.0-20200604202706-70a84ac30bf9 h1:vEg9joUBmeBcK9iSJftGNf3coIG4HqZElCPehJsfAYM=
+golang.org/x/crypto v0.0.0-20200604202706-70a84ac30bf9/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
+golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
+golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20190412213103-97732733099d h1:+R4KGOnez64A81RvjARKc4UT5/tI9ujCIVX+P5KiHuI=
+golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=

entrypoint/main.go

@@ -0,0 +1,109 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"github.com/otiai10/copy"
+	"golang.org/x/crypto/ssh/terminal"
+	"os"
+	"os/exec"
+	"path"
+	"path/filepath"
+	"syscall"
+	"time"
+)
+
+func main() {
+	if err := entrypoint(); err != nil {
+		logf(critical, "%s", err.Error())
+		os.Exit(1)
+	}
+}
+
+func entrypoint() error {
+	if len(os.Args) < 2 {
+		logf(warning, "Nothing to do.")
+		return nil
+	}
+
+	if os.Getpid() == 1 {
+		logf(info, "Initializing /data as we're the init process (PID 1)")
+
+		for _, dir := range []string{"etc", "var/cache", "var/lib", "var/log", "var/run", "var/spool"} {
+			dest := path.Join("/data", dir, "icinga2")
+			logf(info, "Checking %#v", dest)
+
+			if _, errSt := os.Stat(dest); errSt != nil {
+				if os.IsNotExist(errSt) {
+					src := path.Join("/data-init", dir, "icinga2")
+					logf(info, "Copying %#v to %#v", src, dest)
+
+					if errMA := os.MkdirAll(path.Dir(dest), 0755); errMA != nil {
+						return errMA
+					}
+
+					if errCp := copy.Copy(src, dest); errCp != nil {
+						return errCp
+					}
+				} else {
+					return errSt
+				}
+			}
+		}
+	}
+
+	path := os.Args[1]
+	if filepath.Base(path) == path {
+		logf(info, "Looking up %#v in $PATH", path)
+
+		abs, errLP := exec.LookPath(path)
+		if errLP != nil {
+			return errLP
+		}
+
+		path = abs
+	}
+
+	logf(info, "Running %#v", path)
+	return syscall.Exec(path, os.Args[1:], os.Environ())
+}
+
+type logSeverity uint8
+
+const (
+	info logSeverity = iota
+	warning
+	critical
+)
+
+var out = bufio.NewWriter(os.Stderr)
+var isTerminal = terminal.IsTerminal(int(os.Stderr.Fd()))
+
+func logf(severity logSeverity, format string, a ...interface{}) {
+	var color, colorOff, seeverity string
+
+	switch severity {
+	case info:
+		color = "\x1b[32m"
+		seeverity = "information"
+	case warning:
+		color = "\x1b[33m\x1b[1m"
+		seeverity = "warning"
+	case critical:
+		color = "\x1b[31m\x1b[1m"
+		seeverity = "critical"
+	}
+
+	if isTerminal {
+		colorOff = "\x1b[0m"
+	} else {
+		color = ""
+	}
+
+	_, _ = fmt.Fprintf(out, "[%s] ", time.Now().Format("2006-01-02 15:04:05 -0700"))
+	_, _ = fmt.Fprintf(out, "%s%s%s/DockerEntrypoint: ", color, seeverity, colorOff)
+	_, _ = fmt.Fprintf(out, format, a...)
+
+	_, _ = fmt.Fprintln(out)
+	_ = out.Flush()
+}