Add custom process environment (#22)

README.md

@@ -117,6 +117,18 @@ job "foo" {
 }
 ```
 
+You can append a custom environment to the process by setting `env`:
+
+```hcl
+job "foo" {
+  command = "/usr/local/bin/foo"
+  args = ["bar"]
+  env = ["ENABLED=1", "BAR=\"BAZ\""]
+  maxAttempts = 3
+  canFail = false
+}
+```
+
 You can configure a Job to watch files and to send a signal to the managed process if that file changes. This can be used, for example, to send a `SIGHUP` to a process to reload its configuration file when it changes.
   
 ```hcl

internal/config/types.go

@@ -80,6 +80,7 @@ type JobConfig struct {
 	Name         string     `hcl:",key"`
 	Command      string     `hcl:"command"`
 	Args         []string   `hcl:"args"`
+	Env          []string   `hcl:"env"`
 	Watches      []Watch    `hcl:"watch"`
 	MaxAttempts_ int        `hcl:"max_attempts"` // deprecated
 	MaxAttempts  int        `hcl:"maxAttempts"`

pkg/proc/job_lazy.go

@@ -3,9 +3,10 @@ package proc
 import (
 	"context"
 	"fmt"
-	log "github.com/sirupsen/logrus"
 	"os"
 	"os/exec"
+
+	log "github.com/sirupsen/logrus"
 )
 
 func (job *Job) CanStartLazily() bool {
@@ -64,6 +65,9 @@ func (job *Job) start(ctx context.Context, process chan<- *os.Process) error {
 	job.cmd = exec.CommandContext(ctx, job.Config.Command, job.Config.Args...)
 	job.cmd.Stdout = os.Stdout
 	job.cmd.Stderr = os.Stderr
+	if job.Config.Env != nil {
+		job.cmd.Env = append(os.Environ(), job.Config.Env...)
+	}
 
 	for { // restart failed jobs as long mittnite is running
 		l.Info("starting job")