client: enable specifying user/group permissions in the template stanza

api/jobs_test.go

@@ -765,6 +765,8 @@ func TestJobs_Canonicalize(t *testing.T) {
 										ChangeSignal: stringToPtr(""),
 										Splay:        timeToPtr(5 * time.Second),
 										Perms:        stringToPtr("0644"),
+										Uid:          intToPtr(0),
+										Gid:          intToPtr(0),
 										LeftDelim:    stringToPtr("{{"),
 										RightDelim:   stringToPtr("}}"),
 										Envvars:      boolToPtr(false),
@@ -778,6 +780,8 @@ func TestJobs_Canonicalize(t *testing.T) {
 										ChangeSignal: stringToPtr(""),
 										Splay:        timeToPtr(5 * time.Second),
 										Perms:        stringToPtr("0644"),
+										Uid:          intToPtr(0),
+										Gid:          intToPtr(0),
 										LeftDelim:    stringToPtr("{{"),
 										RightDelim:   stringToPtr("}}"),
 										Envvars:      boolToPtr(true),

api/tasks.go

@@ -799,6 +799,8 @@ type Template struct {
 	ChangeSignal *string        `mapstructure:"change_signal" hcl:"change_signal,optional"`
 	Splay        *time.Duration `mapstructure:"splay" hcl:"splay,optional"`
 	Perms        *string        `mapstructure:"perms" hcl:"perms,optional"`
+	Uid          *int           `mapstructure:"uid" hcl:"uid,optional"`
+	Gid          *int           `mapstructure:"gid" hcl:"gid,optional"`
 	LeftDelim    *string        `mapstructure:"left_delimiter" hcl:"left_delimiter,optional"`
 	RightDelim   *string        `mapstructure:"right_delimiter" hcl:"right_delimiter,optional"`
 	Envvars      *bool          `mapstructure:"env" hcl:"env,optional"`
@@ -835,6 +837,12 @@ func (tmpl *Template) Canonicalize() {
 	if tmpl.Perms == nil {
 		tmpl.Perms = stringToPtr("0644")
 	}
+	if tmpl.Uid == nil {
+		tmpl.Uid = intToPtr(0)
+	}
+	if tmpl.Gid == nil {
+		tmpl.Gid = intToPtr(0)
+	}
 	if tmpl.LeftDelim == nil {
 		tmpl.LeftDelim = stringToPtr("{{")
 	}

client/allocrunner/taskrunner/template/template.go

@@ -626,6 +626,12 @@ func parseTemplateConfigs(config *TaskTemplateManagerConfig) (map[*ctconf.Templa
 			m := os.FileMode(v)
 			ct.Perms = &m
 		}
+		// Set ownership
+		if tmpl.Uid != 0 && tmpl.Gid != 0 {
+			ct.Uid = &tmpl.Uid
+			ct.Gid = &tmpl.Gid
+		}
+
 		ct.Finalize()
 
 		ctmpls[ct] = tmpl

client/allocrunner/taskrunner/template/template_test.go

@@ -16,6 +16,7 @@ import (
 	"strconv"
 	"strings"
 	"sync"
+	"syscall"
 	"testing"
 	"time"
 
@@ -512,6 +513,8 @@ func TestTaskTemplateManager_Permissions(t *testing.T) {
 		DestPath:     file,
 		ChangeMode:   structs.TemplateChangeModeNoop,
 		Perms:        "777",
+		Uid:          503,
+		Gid:          20,
 	}
 
 	harness := newTestHarness(t, []*structs.Template{template}, false, false)
@@ -535,6 +538,17 @@ func TestTaskTemplateManager_Permissions(t *testing.T) {
 	if m := fi.Mode(); m != os.ModePerm {
 		t.Fatalf("Got mode %v; want %v", m, os.ModePerm)
 	}
+
+	sys := fi.Sys()
+	uid := int(sys.(*syscall.Stat_t).Uid)
+	gid := int(sys.(*syscall.Stat_t).Gid)
+
+	if uid != template.Uid {
+		t.Fatalf("Got uid #{uid}; want #{template.Uid}")
+	}
+	if gid != template.Gid {
+		t.Fatalf("Got gid #{uid}; want #{template.Gid}")
+	}
 }
 
 func TestTaskTemplateManager_Unblock_Static_NomadEnv(t *testing.T) {

jobspec/helper.go

@@ -18,6 +18,11 @@ func stringToPtr(str string) *string {
 	return &str
 }
 
+// intToPtr returns the pointer to an int
+func intToPtr(i int) *int {
+	return &i
+}
+
 // timeToPtr returns the pointer to a time.Duration.
 func timeToPtr(t time.Duration) *time.Duration {
 	return &t

jobspec/parse_task.go

@@ -441,6 +441,8 @@ func parseTemplates(result *[]*api.Template, list *ast.ObjectList) error {
 			"destination",
 			"left_delimiter",
 			"perms",
+			"uid",
+			"gid",
 			"right_delimiter",
 			"source",
 			"splay",
@@ -460,6 +462,8 @@ func parseTemplates(result *[]*api.Template, list *ast.ObjectList) error {
 			ChangeMode: stringToPtr("restart"),
 			Splay:      timeToPtr(5 * time.Second),
 			Perms:      stringToPtr("0644"),
+			Uid:        intToPtr(0),
+			Gid:        intToPtr(0),
 		}
 
 		dec, err := mapstructure.NewDecoder(&mapstructure.DecoderConfig{

jobspec/parse_test.go

@@ -24,6 +24,17 @@ const (
 	templateChangeModeRestart = "restart"
 )
 
+// Helper functions below are only used by this test suite
+func int8ToPtr(i int8) *int8 {
+	return &i
+}
+func uint64ToPtr(u uint64) *uint64 {
+	return &u
+}
+func int64ToPtr(i int64) *int64 {
+	return &i
+}
+
 func TestParse(t *testing.T) {
 	ci.Parallel(t)
 
@@ -363,6 +374,8 @@ func TestParse(t *testing.T) {
 										ChangeSignal: stringToPtr("foo"),
 										Splay:        timeToPtr(10 * time.Second),
 										Perms:        stringToPtr("0644"),
+										Uid:          intToPtr(0),
+										Gid:          intToPtr(0),
 										Envvars:      boolToPtr(true),
 										VaultGrace:   timeToPtr(33 * time.Second),
 									},
@@ -372,6 +385,8 @@ func TestParse(t *testing.T) {
 										ChangeMode: stringToPtr(templateChangeModeRestart),
 										Splay:      timeToPtr(5 * time.Second),
 										Perms:      stringToPtr("777"),
+										Uid:        intToPtr(1001),
+										Gid:        intToPtr(20),
 										LeftDelim:  stringToPtr("--"),
 										RightDelim: stringToPtr("__"),
 									},

jobspec/test-fixtures/basic.hcl

@@ -318,6 +318,8 @@ job "binstore-storagelocker" {
         source          = "bar"
         destination     = "bar"
         perms           = "777"
+        uid             = 1001
+        gid             = 20
         left_delimiter  = "--"
         right_delimiter = "__"
       }

jobspec2/parse_job.go

@@ -107,6 +107,12 @@ func normalizeTemplates(templates []*api.Template) {
 		if t.Perms == nil {
 			t.Perms = stringToPtr("0644")
 		}
+		if t.Uid == nil {
+			t.Uid = intToPtr(0)
+		}
+		if t.Gid == nil {
+			t.Gid = intToPtr(0)
+		}
 		if t.Splay == nil {
 			t.Splay = durationToPtr(5 * time.Second)
 		}
@@ -121,6 +127,10 @@ func boolToPtr(v bool) *bool {
 	return &v
 }
 
+func intToPtr(v int) *int {
+	return &v
+}
+
 func stringToPtr(v string) *string {
 	return &v
 }

nomad/structs/diff_test.go

@@ -7044,6 +7044,8 @@ func TestTaskDiff(t *testing.T) {
 						ChangeSignal: "SIGHUP",
 						Splay:        1,
 						Perms:        "0644",
+						Uid:          1001,
+						Gid:          21,
 						Wait: &WaitConfig{
 							Min: helper.TimeToPtr(5 * time.Second),
 							Max: helper.TimeToPtr(5 * time.Second),
@@ -7057,6 +7059,8 @@ func TestTaskDiff(t *testing.T) {
 						ChangeSignal: "SIGHUP2",
 						Splay:        2,
 						Perms:        "0666",
+						Uid:          1000,
+						Gid:          20,
 						Envvars:      true,
 					},
 				},
@@ -7071,6 +7075,8 @@ func TestTaskDiff(t *testing.T) {
 						ChangeSignal: "SIGHUP",
 						Splay:        1,
 						Perms:        "0644",
+						Uid:          1001,
+						Gid:          21,
 						Wait: &WaitConfig{
 							Min: helper.TimeToPtr(5 * time.Second),
 							Max: helper.TimeToPtr(10 * time.Second),
@@ -7084,6 +7090,8 @@ func TestTaskDiff(t *testing.T) {
 						ChangeSignal: "SIGHUP3",
 						Splay:        3,
 						Perms:        "0776",
+						Uid:          1002,
+						Gid:          22,
 						Wait: &WaitConfig{
 							Min: helper.TimeToPtr(5 * time.Second),
 							Max: helper.TimeToPtr(10 * time.Second),
@@ -7154,6 +7162,12 @@ func TestTaskDiff(t *testing.T) {
 								Old:  "",
 								New:  "false",
 							},
+							{
+								Type: DiffTypeAdded,
+								Name: "Gid",
+								Old:  "",
+								New:  "22",
+							},
 							{
 								Type: DiffTypeAdded,
 								Name: "Perms",
@@ -7172,6 +7186,12 @@ func TestTaskDiff(t *testing.T) {
 								Old:  "",
 								New:  "3",
 							},
+							{
+								Type: DiffTypeAdded,
+								Name: "Uid",
+								Old:  "",
+								New:  "1002",
+							},
 							{
 								Type: DiffTypeAdded,
 								Name: "VaultGrace",
@@ -7234,6 +7254,12 @@ func TestTaskDiff(t *testing.T) {
 								Old:  "true",
 								New:  "",
 							},
+							{
+								Type: DiffTypeDeleted,
+								Name: "Gid",
+								Old:  "20",
+								New:  "",
+							},
 							{
 								Type: DiffTypeDeleted,
 								Name: "Perms",
@@ -7252,6 +7278,12 @@ func TestTaskDiff(t *testing.T) {
 								Old:  "2",
 								New:  "",
 							},
+							{
+								Type: DiffTypeDeleted,
+								Name: "Uid",
+								Old:  "1000",
+								New:  "",
+							},
 							{
 								Type: DiffTypeDeleted,
 								Name: "VaultGrace",

nomad/structs/structs.go

@@ -7644,6 +7644,9 @@ type Template struct {
 
 	// Perms is the permission the file should be written out with.
 	Perms string
+	// User and group that should own the file.
+	Uid int
+	Gid int
 
 	// LeftDelim and RightDelim are optional configurations to control what
 	// delimiter is utilized when parsing the template.

website/content/api-docs/json-jobs.mdx

@@ -1077,6 +1077,10 @@ README][ct].
 - `Perms` - Specifies the rendered template's permissions. File permissions are
   given as octal of the Unix file permissions `rwxrwxrwx`.
 
+- `Uid` - Specifies the rendered template owner's user ID.
+
+- `Gid` - Specifies the rendered template owner's group ID.
+
 - `RightDelim` - Specifies the right delimiter to use in the template. The default
   is "}}" for some templates, it may be easier to use a different delimiter that
   does not conflict with the output file itself.

website/content/docs/job-specification/template.mdx

@@ -84,6 +84,10 @@ refer to the [Learn Go Template Syntax][gt_learn] Learn guide.
 - `perms` `(string: "644")` - Specifies the rendered template's permissions.
   File permissions are given as octal of the Unix file permissions `rwxrwxrwx`.
 
+- `uid` `(int: 0)` - Specifies the rendered template owner's user ID.
+
+- `gid` `(int: 0)` - Specifies the rendered template owner's group ID.
+
 - `right_delimiter` `(string: "}}")` - Specifies the right delimiter to use in the
   template. The default is "}}" for some templates, it may be easier to use a
   different delimiter that does not conflict with the output file itself.
@@ -561,4 +565,4 @@ options](/docs/configuration/client#options):
 [task working directory]: /docs/runtime/environment#task-directories 'Task Directories'
 [filesystem internals]: /docs/concepts/filesystem#templates-artifacts-and-dispatch-payloads
 [`client.template.wait_bounds`]: /docs/configuration/client#wait_bounds
-[rhash]: https://en.wikipedia.org/wiki/Rendezvous_hashing
+[rhash]: https://en.wikipedia.org/wiki/Rendezvous_hashing