15003: Add config-check command.

[arvados.git] / lib / config / cmd.go

diff --git a/lib/config/cmd.go b/lib/config/cmd.go
index aa3e3bca1267f18f65f5cfe8436c0bf879927709..e3419cee54e1d64689ddab47b2495203b8c6763c 100644 (file)
--- a/lib/config/cmd.go
+++ b/lib/config/cmd.go
@@ -5,8 +5,12 @@
 package config
 
 import (
+       "bytes"
        "fmt"
        "io"
+       "io/ioutil"
+       "os"
+       "os/exec"
 
        "git.curoverse.com/arvados.git/lib/cmd"
        "git.curoverse.com/arvados.git/sdk/go/ctxlog"
@@ -43,3 +47,53 @@ func (dumpCommand) RunCommand(prog string, args []string, stdin io.Reader, stdou
        }
        return 0
 }
+
+var CheckCommand cmd.Handler = checkCommand{}
+
+type checkCommand struct{}
+
+func (checkCommand) RunCommand(prog string, args []string, stdin io.Reader, stdout, stderr io.Writer) int {
+       var err error
+       defer func() {
+               if err != nil {
+                       fmt.Fprintf(stderr, "%s\n", err)
+               }
+       }()
+       if len(args) != 0 {
+               err = fmt.Errorf("usage: %s <config-src.yaml && echo 'no changes needed'", prog)
+               return 2
+       }
+       log := ctxlog.New(stderr, "text", "info")
+       buf, err := ioutil.ReadAll(stdin)
+       if err != nil {
+               return 1
+       }
+       withoutDepr, err := load(bytes.NewBuffer(buf), log, false)
+       if err != nil {
+               return 1
+       }
+       withDepr, err := load(bytes.NewBuffer(buf), log, true)
+       if err != nil {
+               return 1
+       }
+       cmd := exec.Command("diff", "-u", "--label", "without-deprecated-configs", "--label", "relying-on-deprecated-configs", "/dev/fd/3", "/dev/fd/4")
+       for _, obj := range []interface{}{withoutDepr, withDepr} {
+               y, _ := yaml.Marshal(obj)
+               pr, pw, err := os.Pipe()
+               if err != nil {
+                       return 1
+               }
+               defer pr.Close()
+               go func() {
+                       io.Copy(pw, bytes.NewBuffer(y))
+                       pw.Close()
+               }()
+               cmd.ExtraFiles = append(cmd.ExtraFiles, pr)
+       }
+       diff, err := cmd.CombinedOutput()
+       if err == nil {
+               return 0
+       }
+       _, err = stdout.Write(diff)
+       return 1
+}