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buildkit_printer.go
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/
buildkit_printer.go
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package build
import (
"fmt"
"io"
"regexp"
"strings"
digest "github.com/opencontainers/go-digest"
"github.com/windmilleng/tilt/internal/logger"
)
type buildkitPrinter struct {
logger logger.Logger
vData map[digest.Digest]*vertexAndLogs
vOrder []digest.Digest
}
type vertex struct {
digest digest.Digest
name string
error string
started bool
completed bool
cmdPrinted bool
}
// HACK: The prefix we assume here isn't valid for RUNS in exec format
// Ex: RUN ["echo", "hello world"]
const cmdPrefix = "/bin/sh -c "
const buildPrefix = " ╎ "
var stepPattern = regexp.MustCompile(`^\[[0-9]+/[0-9]+\]`)
func (v *vertex) isRun() bool {
return strings.HasPrefix(v.name, cmdPrefix)
}
func (v *vertex) isStep() bool {
return stepPattern.MatchString(v.name)
}
func (v *vertex) isError() bool {
return len(v.error) > 0
}
type vertexAndLogs struct {
vertex *vertex
logs []*vertexLog
logsPrinted int
}
type vertexLog struct {
vertex digest.Digest
msg []byte
}
func newBuildkitPrinter(logger logger.Logger) *buildkitPrinter {
return &buildkitPrinter{
logger: logger,
vData: map[digest.Digest]*vertexAndLogs{},
vOrder: []digest.Digest{},
}
}
func (b *buildkitPrinter) parseAndPrint(vertexes []*vertex, logs []*vertexLog) error {
for _, v := range vertexes {
if vl, ok := b.vData[v.digest]; ok {
vl.vertex.started = v.started
vl.vertex.completed = v.completed
if v.isError() {
vl.vertex.error = v.error
}
} else {
b.vData[v.digest] = &vertexAndLogs{
vertex: v,
logs: []*vertexLog{},
}
b.vOrder = append(b.vOrder, v.digest)
}
}
for _, l := range logs {
if vl, ok := b.vData[l.vertex]; ok {
vl.logs = append(vl.logs, l)
}
}
for _, d := range b.vOrder {
vl, ok := b.vData[d]
if !ok {
return fmt.Errorf("Expected to find digest %s in %+v", d, b.vData)
}
if vl.vertex.started && !vl.vertex.cmdPrinted {
if vl.vertex.isRun() {
b.logger.Infof("%sRUNNING: %s", buildPrefix, trimCmd(vl.vertex.name))
vl.vertex.cmdPrinted = true
} else if vl.vertex.isStep() {
b.logger.Infof("%s%s", buildPrefix, trimCmd(vl.vertex.name))
vl.vertex.cmdPrinted = true
}
}
if vl.vertex.isError() {
b.logger.Infof("\n%sERROR IN: %s", buildPrefix, trimCmd(vl.vertex.name))
err := b.flushLogs(b.logger.Writer(logger.InfoLvl), vl)
if err != nil {
return err
}
}
if vl.vertex.isRun() || vl.vertex.isStep() {
err := b.flushLogs(b.logger.Writer(logger.InfoLvl), vl)
if err != nil {
return err
}
}
}
return nil
}
func (b *buildkitPrinter) flushLogs(writer io.Writer, vl *vertexAndLogs) error {
for vl.logsPrinted < len(vl.logs) {
l := vl.logs[vl.logsPrinted]
vl.logsPrinted++
sl := strings.TrimSpace(string(l.msg))
if len(sl) == 0 {
continue
}
msg := fmt.Sprintf("%s → %s\n", buildPrefix, sl)
_, err := writer.Write([]byte(msg))
if err != nil {
return err
}
}
return nil
}
func trimCmd(cmd string) string {
return strings.TrimPrefix(cmd, cmdPrefix)
}