daemon: provide os.Environ() in zrepl status

Useful for debugging.

fixes https://github.com/zrepl/zrepl/issues/534

daemon/control.go

@@ -8,6 +8,7 @@ import (
 	"io"
 	"net"
 	"net/http"
+	"os"
 	"time"
 
 	"github.com/pkg/errors"
@@ -124,8 +125,9 @@ func (j *controlJob) Run(ctx context.Context) {
 			s := Status{
 				Jobs: jobs,
 				Global: GlobalStatus{
-					ZFSCmds:  globalZFS,
-					Envconst: envconstReport,
+					ZFSCmds:   globalZFS,
+					Envconst:  envconstReport,
+					OsEnviron: os.Environ(),
 				}}
 			return s, nil
 		}})

daemon/daemon.go

@@ -160,8 +160,9 @@ type Status struct {
 }
 
 type GlobalStatus struct {
-	ZFSCmds  *zfscmd.Report
-	Envconst *envconst.Report
+	ZFSCmds   *zfscmd.Report
+	Envconst  *envconst.Report
+	OsEnviron []string
 }
 
 func (s *jobs) status() map[string]*job.Status {