Add internal DNS server if no custom DNS is set (#45)
Fixes #44 Co-authored-by: Lauris BH <lauris@nix.lv> Reviewed-on: https://codeberg.org/woodpecker-plugins/plugin-docker-buildx/pulls/45 Reviewed-by: 6543 <6543@obermui.de> Co-authored-by: Lauris BH <lafriks@noreply.codeberg.org> Co-committed-by: Lauris BH <lafriks@noreply.codeberg.org>
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@ -15,6 +15,9 @@ RUN --mount=type=cache,target=/root/.cache/go-build \
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FROM docker/buildx-bin:${BUILDX_VERSION} as buildx-bin
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FROM docker:${DOCKER_VERSION}
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RUN apk --update --no-cache add coredns
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COPY --from=build /src/Corefile /etc/coredns/Corefile
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COPY --from=buildx-bin /buildx /usr/libexec/docker/cli-plugins/docker-buildx
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COPY --from=build /src/plugin-docker-buildx /bin/plugin-docker-buildx
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48
plugin/coredns.go
Normal file
48
plugin/coredns.go
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@ -0,0 +1,48 @@
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package plugin
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import (
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"io"
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"net"
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"os"
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"os/exec"
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)
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func (p Plugin) startCoredns() {
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cmd := exec.Command("coredns", "-conf", "/etc/coredns/Corefile")
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if p.settings.Daemon.Debug {
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cmd.Stdout = os.Stdout
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cmd.Stderr = os.Stderr
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} else {
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cmd.Stdout = io.Discard
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cmd.Stderr = io.Discard
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}
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go func() {
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trace(cmd)
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cmd.Run()
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}()
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}
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func getContainerIP() (string, error) {
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ifaces, err := net.Interfaces()
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if err != nil {
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return "", err
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}
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for _, i := range ifaces {
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addrs, err := i.Addrs()
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if err != nil {
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return "", err
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}
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for _, addr := range addrs {
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switch v := addr.(type) {
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case *net.IPNet:
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if v.IP.IsLoopback() {
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continue
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}
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if v.IP.To4() != nil {
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return v.IP.String(), nil
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}
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}
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}
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}
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return "", nil
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}
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@ -209,6 +209,17 @@ func (p *Plugin) writeBuildkitConfig() error {
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func (p *Plugin) Execute() error {
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// start the Docker daemon server
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if !p.settings.Daemon.Disabled {
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// If no custom DNS value set start internal DNS server
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if len(p.settings.Daemon.DNS.Value()) == 0 {
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ip, err := getContainerIP()
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if err != nil {
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logrus.Warnf("error detecting IP address: %v", err)
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} else if ip != "" {
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p.startCoredns()
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p.settings.Daemon.DNS.Set(ip)
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}
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}
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p.startDaemon()
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}
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