Add support for the sprig functions library

All functions are not supported, The following are discarded:
	// Date functions
	"date",
	"date_in_zone",
	"date_modify",
	"now",
	"htmlDate",
	"htmlDateInZone",
	"dateInZone",
	"dateModify",

	// Strings
	"randAlphaNum",
	"randAlpha",
	"randAscii",
	"randNumeric",
	"uuidv4",

	// OS
	"env",
	"expandenv",

	// Network
	"getHostByName",
Commit message templating can use those functions

Signed-off-by: Soule BA <bah.soule@gmail.com>

controllers/imageupdateautomation_controller.go

@@ -29,6 +29,8 @@ import (
 	"text/template"
 	"time"
 
+	"github.com/Masterminds/sprig/v3"
+
 	gogit "github.com/go-git/go-git/v5"
 	libgit2 "github.com/libgit2/git2go/v31"
 
@@ -300,17 +302,9 @@ func (r *ImageUpdateAutomationReconciler) Reconcile(ctx context.Context, req ctr
 	}
 
 	// construct the commit message from template and values
-	msgTmpl := gitSpec.Commit.MessageTemplate
-	if msgTmpl == "" {
-		msgTmpl = defaultMessageTemplate
-	}
-	tmpl, err := template.New("commit message").Parse(msgTmpl)
+	message, err := templateMsg(gitSpec.Commit.MessageTemplate, &templateValues)
 	if err != nil {
-		return failWithError(fmt.Errorf("unable to create commit message template from spec: %w", err))
-	}
-	messageBuf := &strings.Builder{}
-	if err := tmpl.Execute(messageBuf, templateValues); err != nil {
-		return failWithError(fmt.Errorf("failed to run template from spec: %w", err))
+		return failWithError(err)
 	}
 
 	// The status message depends on what happens next. Since there's
@@ -322,7 +316,7 @@ func (r *ImageUpdateAutomationReconciler) Reconcile(ctx context.Context, req ctr
 		When:  time.Now(),
 	}
 
-	if rev, err := commitChangedManifests(tracelog, repo, tmp, signingEntity, author, messageBuf.String()); err != nil {
+	if rev, err := commitChangedManifests(tracelog, repo, tmp, signingEntity, author, message); err != nil {
 		if err == errNoChanges {
 			r.event(ctx, auto, events.EventSeverityInfo, "no updates made")
 			debuglog.Info("no changes made in working directory; no commit")
@@ -793,3 +787,24 @@ func (r *ImageUpdateAutomationReconciler) recordSuspension(ctx context.Context,
 		r.MetricsRecorder.RecordSuspend(*objRef, auto.Spec.Suspend)
 	}
 }
+
+// templateMsg renders a msg template, returning the message or an error.
+func templateMsg(messageTemplate string, templateValues *TemplateData) (string, error) {
+	if messageTemplate == "" {
+		messageTemplate = defaultMessageTemplate
+	}
+
+	// Includes only functions that are guaranteed to always evaluate to the same result for given input.
+	// This removes the possibility of accidentally relying on where or when the template runs.
+	// https://github.com/Masterminds/sprig/blob/3ac42c7bc5e4be6aa534e036fb19dde4a996da2e/functions.go#L70
+	t, err := template.New("commit message").Funcs(sprig.HermeticTxtFuncMap()).Parse(messageTemplate)
+	if err != nil {
+		return "", fmt.Errorf("unable to create commit message template from spec: %w", err)
+	}
+
+	b := &strings.Builder{}
+	if err := t.Execute(b, *templateValues); err != nil {
+		return "", fmt.Errorf("failed to run template from spec: %w", err)
+	}
+	return b.String(), nil
+}

controllers/update_test.go

@@ -135,8 +135,12 @@ Files:
 
 Objects:
 {{ range $resource, $_ := .Updated.Objects -}}
+{{ if eq $resource.Kind "Deployment" -}}
+- {{ $resource.Kind | lower }} {{ $resource.Name | lower }}
+{{ else -}}
 - {{ $resource.Kind }} {{ $resource.Name }}
 {{ end -}}
+{{ end -}}
 
 Images:
 {{ range .Updated.Images -}}
@@ -150,7 +154,7 @@ Automation: %s/update-test
 Files:
 - deploy.yaml
 Objects:
-- Deployment test
+- deployment test
 Images:
 - helloworld:v1.0.0 (%s)
 `

docs/spec/v1beta1/imageupdateautomations.md

@@ -315,7 +315,45 @@ spec:
       - {{.}}
       {{ end -}}
 ```
+#### Commit Message with Template functions
 
+With template functions, it is possible to manipulate and transform the supplied data in order to generate more complex commit messages.
+
+```yaml
+kind: ImageUpdateAutomation
+metadata:
+  name: flux-system
+spec:
+  git:
+    commit:
+      messageTemplate: |
+        Automated image update
+
+        Automation name: {{ .AutomationObject }}
+
+        Files:
+        {{ range $filename, $_ := .Updated.Files -}}
+        - {{ $filename }}
+        {{ end -}}
+
+        Objects:
+        {{ range $resource, $_ := .Updated.Objects -}}
+        - {{ $resource.Kind | lower }} {{ $resource.Name | lower  }}
+        {{ end -}}
+
+        Images:
+        {{ range $image, $_ := .Updated.Images -}}
+        	{{ if contains "1.0.0" $image -}}
+        		- {{ $image }}
+        	{{ else -}}
+        		[skip ci] wrong image
+        	{{ end -}}        
+        {{ end -}}        
+      author:
+        email: fluxcdbot@users.noreply.github.com
+        name: fluxcdbot
+```
+There are over 70 available functions. Some of them are defined by the [Go template language](https://pkg.go.dev/text/template) itself. Most of the others are part of the [Sprig template library](http://masterminds.github.io/sprig/). 
 ### Push
 
 The optional `push` field defines how commits are pushed to the origin.

go.mod

@@ -5,6 +5,7 @@ go 1.16
 replace github.com/fluxcd/image-automation-controller/api => ./api
 
 require (
+	github.com/Masterminds/sprig/v3 v3.2.2
 	github.com/ProtonMail/go-crypto v0.0.0-20210428141323-04723f9f07d7
 	github.com/cyphar/filepath-securejoin v0.2.2
 	github.com/fluxcd/image-automation-controller/api v0.14.1

go.sum

@@ -58,10 +58,12 @@ github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym
 github.com/DATA-DOG/go-sqlmock v1.5.0/go.mod h1:f/Ixk793poVmq4qj/V1dPUg2JEAKC73Q5eFN3EC/SaM=
 github.com/Knetic/govaluate v3.0.1-0.20171022003610-9aa49832a739+incompatible/go.mod h1:r7JcOSlj0wfOMncg0iLm8Leh48TZaKVeNIfJntJ2wa0=
 github.com/MakeNowJust/heredoc v0.0.0-20170808103936-bb23615498cd/go.mod h1:64YHyfSL2R96J44Nlwm39UHepQbyR5q10x7iYa1ks2E=
+github.com/Masterminds/goutils v1.1.1 h1:5nUrii3FMTL5diU80unEVvNevw1nH4+ZV4DSLVJLSYI=
 github.com/Masterminds/goutils v1.1.1/go.mod h1:8cTjp+g8YejhMuvIA5y2vz3BpJxksy863GQaJW2MFNU=
 github.com/Masterminds/semver/v3 v3.1.0/go.mod h1:VPu/7SZ7ePZ3QOrcuXROw5FAcLl4a0cBrbBpGY/8hQs=
 github.com/Masterminds/semver/v3 v3.1.1 h1:hLg3sBzpNErnxhQtUy/mmLR2I9foDujNK030IGemrRc=
 github.com/Masterminds/semver/v3 v3.1.1/go.mod h1:VPu/7SZ7ePZ3QOrcuXROw5FAcLl4a0cBrbBpGY/8hQs=
+github.com/Masterminds/sprig/v3 v3.2.2 h1:17jRggJu518dr3QaafizSXOjKYp94wKfABxUmyxvxX8=
 github.com/Masterminds/sprig/v3 v3.2.2/go.mod h1:UoaO7Yp8KlPnJIYWTFkMaqPUYKTfGFPhxNuwnnxkKlk=
 github.com/Masterminds/squirrel v1.5.0/go.mod h1:NNaOrjSoIDfDA40n7sr2tPNZRfjzjA400rg+riTZj10=
 github.com/Masterminds/vcs v1.13.1/go.mod h1:N09YCmOQr6RLxC6UNHzuVwAdodYbbnycGHSmwVJjcKA=
@@ -616,6 +618,7 @@ github.com/hashicorp/mdns v1.0.0/go.mod h1:tL+uN++7HEJ6SQLQ2/p+z2pH24WQKWjBPkE0m
 github.com/hashicorp/memberlist v0.1.3/go.mod h1:ajVTdAv/9Im8oMAAj5G31PhhMCZJV2pPBoIllUwCN7I=
 github.com/hashicorp/serf v0.8.2/go.mod h1:6hOLApaqBFA1NXqRQAsxw9QxuDEvNxSQRwA/JwenrHc=
 github.com/hpcloud/tail v1.0.0/go.mod h1:ab1qPbhIpdTxEkNHXyeSf5vhxWSCs/tWer42PpOxQnU=
+github.com/huandu/xstrings v1.3.1 h1:4jgBlKK6tLKFvO8u5pmYjG91cqytmDCDvGh7ECVFfFs=
 github.com/huandu/xstrings v1.3.1/go.mod h1:y5/lhBue+AyNmUVz9RLU9xbLR0o4KIIExikq4ovT0aE=
 github.com/hudl/fargo v1.3.0/go.mod h1:y3CKSmjA+wD2gak7sUSXTAoopbhU08POFhmITJgmKTg=
 github.com/ianlancetaylor/demangle v0.0.0-20181102032728-5e5cf60278f6/go.mod h1:aSSvb/t6k1mPoxDqO4vJh6VOCGPwU4O0C2/Eqndh1Sc=
@@ -723,6 +726,7 @@ github.com/minio/sha256-simd v0.1.1/go.mod h1:B5e1o+1/KgNmWrSQK08Y6Z1Vb5pwIktudl
 github.com/mistifyio/go-zfs v2.1.2-0.20190413222219-f784269be439+incompatible/go.mod h1:8AuVvqP/mXw1px98n46wfvcGfQ4ci2FwoAjKYxuo3Z4=
 github.com/mitchellh/cli v1.0.0/go.mod h1:hNIlj7HEI86fIcpObd7a0FcrxTWetlwJDGcceTlRvqc=
 github.com/mitchellh/copystructure v1.0.0/go.mod h1:SNtv71yrdKgLRyLFxmLdkAbkKEFWgYaq1OVrnRcwhnw=
+github.com/mitchellh/copystructure v1.1.1 h1:Bp6x9R1Wn16SIz3OfeDr0b7RnCG2OB66Y7PQyC/cvq4=
 github.com/mitchellh/copystructure v1.1.1/go.mod h1:EBArHfARyrSWO/+Wyr9zwEkc6XMFB9XyNgFNmRkZZU4=
 github.com/mitchellh/go-homedir v1.0.0/go.mod h1:SfyaCUpYCn1Vlf4IUYiD9fPX4A5wJrkLzIz1N1q0pr0=
 github.com/mitchellh/go-homedir v1.1.0 h1:lukF9ziXFxDFPkA1vsr5zpc1XuPDn/wFntq5mG+4E0Y=
@@ -737,6 +741,7 @@ github.com/mitchellh/mapstructure v1.4.1 h1:CpVNEelQCZBooIPDn+AR3NpivK/TIKU8bDxd
 github.com/mitchellh/mapstructure v1.4.1/go.mod h1:bFUtVrKA4DC2yAKiSyO/QUcy7e+RRV2QTWOzhPopBRo=
 github.com/mitchellh/osext v0.0.0-20151018003038-5e2d6d41470f/go.mod h1:OkQIRizQZAeMln+1tSwduZz7+Af5oFlKirV/MSYes2A=
 github.com/mitchellh/reflectwalk v1.0.0/go.mod h1:mSTlrgnPZtwu0c4WaC2kGObEpuNDbx0jmZXqmk4esnw=
+github.com/mitchellh/reflectwalk v1.0.1 h1:FVzMWA5RllMAKIdUSC8mdWo3XtwoecrH79BY70sEEpE=
 github.com/mitchellh/reflectwalk v1.0.1/go.mod h1:mSTlrgnPZtwu0c4WaC2kGObEpuNDbx0jmZXqmk4esnw=
 github.com/moby/locker v1.0.1/go.mod h1:S7SDdo5zpBK84bzzVlKr2V0hz+7x9hWbYC/kq7oQppc=
 github.com/moby/spdystream v0.2.0/go.mod h1:f7i0iNDQJ059oMTcWxx8MA/zKFIuD/lY+0GqbN2Wy8c=
@@ -922,6 +927,7 @@ github.com/seccomp/libseccomp-golang v0.9.1/go.mod h1:GbW5+tmTXfcxTToHLXlScSlAvW
 github.com/sergi/go-diff v1.0.0/go.mod h1:0CfEIISq7TuYL3j771MWULgwwjU+GofnZX9QAmXWZgo=
 github.com/sergi/go-diff v1.1.0 h1:we8PVUC3FE2uYfodKH/nBHMSetSfHDR6scGdBi+erh0=
 github.com/sergi/go-diff v1.1.0/go.mod h1:STckp+ISIX8hZLjrqAeVduY0gWCT9IjLuqbuNXdaHfM=
+github.com/shopspring/decimal v1.2.0 h1:abSATXmQEYyShuxI4/vyW3tV1MrKAJzCZ/0zLUXYbsQ=
 github.com/shopspring/decimal v1.2.0/go.mod h1:DKyhrW/HYNuLGql+MJL6WCR6knT2jwCFRcu2hWCYk4o=
 github.com/shurcooL/sanitized_anchor_name v1.0.0/go.mod h1:1NzhyTcUVG4SuEtjjoZeVRXNmyL/1OwPU0+IJeTBvfc=
 github.com/sirupsen/logrus v1.0.4-0.20170822132746-89742aefa4b2/go.mod h1:pMByvHTf9Beacp5x1UXfOR9xyW/9antXMhjMPG0dEzc=
@@ -944,6 +950,7 @@ github.com/spf13/afero v1.1.2/go.mod h1:j4pytiNVoe2o6bmDsKpLACNPDBIoEAkihy7loJ1B
 github.com/spf13/afero v1.2.2/go.mod h1:9ZxEEn6pIJ8Rxe320qSDBk6AsU0r9pR7Q4OcevTdifk=
 github.com/spf13/afero v1.6.0/go.mod h1:Ai8FlHk4v/PARR026UzYexafAt9roJ7LcLMAmO6Z93I=
 github.com/spf13/cast v1.3.0/go.mod h1:Qx5cxh0v+4UWYiBimWS+eyWzqEqokIECu5etghLkUJE=
+github.com/spf13/cast v1.3.1 h1:nFm6S0SMdyzrzcmThSipiEubIDy8WEXKNZ0UOgiRpng=
 github.com/spf13/cast v1.3.1/go.mod h1:Qx5cxh0v+4UWYiBimWS+eyWzqEqokIECu5etghLkUJE=
 github.com/spf13/cobra v0.0.2-0.20171109065643-2da4a54c5cee/go.mod h1:1l0Ry5zgKvJasoi3XT1TypsSe7PqH0Sj9dhYf7v3XqQ=
 github.com/spf13/cobra v0.0.3/go.mod h1:1l0Ry5zgKvJasoi3XT1TypsSe7PqH0Sj9dhYf7v3XqQ=