From f51843f634ed37d02558ba49cda7c24764f928ac Mon Sep 17 00:00:00 2001
From: Julien Dessaux
Date: Tue, 26 Mar 2024 08:31:53 +0100
Subject: feat(users): implemented basic user creation promise

---
 pkg/gonf.go                |  8 ++++
 pkg/users.go               | 95 ++++++++++++++++++++++++++++++++++++++++++++++
 stdlib/os/linux/useradd.go | 26 +++++++++++++
 3 files changed, 129 insertions(+)
 create mode 100644 pkg/users.go
 create mode 100644 stdlib/os/linux/useradd.go

diff --git a/pkg/gonf.go b/pkg/gonf.go
index 88edf9c..5e02176 100644
--- a/pkg/gonf.go
+++ b/pkg/gonf.go
@@ -14,6 +14,14 @@ func EnableDebugLogs() {
 
 func Resolve() (status Status) {
 	for {
+		// ----- Users -------------------------------------------------
+		status = resolveUsers()
+		switch status {
+		case BROKEN:
+			return BROKEN
+		case REPAIRED:
+			continue
+		}
 		// ----- Files -------------------------------------------------
 		status = resolveFiles()
 		switch status {
diff --git a/pkg/users.go b/pkg/users.go
new file mode 100644
index 0000000..ca7913b
--- /dev/null
+++ b/pkg/users.go
@@ -0,0 +1,95 @@
+package gonf
+
+import (
+	"log/slog"
+)
+
+// ----- Globals ---------------------------------------------------------------
+var users []*UserPromise
+
+// users management functions
+var user_add_function func(data UserData) (Status, error)
+
+// ----- Init ------------------------------------------------------------------
+func init() {
+	users = make([]*UserPromise, 0)
+}
+
+// ----- Public ----------------------------------------------------------------
+func SetUsersConfiguration(useradd func(data UserData) (Status, error)) {
+	user_add_function = useradd
+}
+
+func User(data UserData) *UserPromise {
+	if data.Name == "" {
+		panic("User() promise invoked without specifying a username")
+	}
+	return &UserPromise{
+		chain:  nil,
+		data:   data,
+		states: nil,
+		status: PROMISED,
+	}
+}
+
+type UserData struct {
+	HomeDir string
+	Name    string
+	System  bool
+}
+
+type UserPromise struct {
+	chain  []Promise
+	data   UserData
+	states []string
+	status Status
+}
+
+func (u *UserPromise) IfRepaired(p ...Promise) Promise {
+	u.chain = append(u.chain, p...)
+	return u
+}
+
+func (u *UserPromise) Promise() Promise {
+	users = append(users, u)
+	return u
+}
+
+func (u *UserPromise) Resolve() {
+	var err error
+	u.status, err = user_add_function(u.data)
+	switch u.status {
+	case BROKEN:
+		slog.Error("user", "name", u.data.Name, "status", u.status, "error", err)
+	case KEPT:
+		slog.Debug("user", "name", u.data.Name, "status", u.status)
+	case REPAIRED:
+		slog.Info("user", "name", u.data.Name, "status", u.status)
+		if u.status == REPAIRED {
+			for _, pp := range u.chain {
+				pp.Resolve()
+			}
+		}
+	}
+}
+
+func (u UserPromise) Status() Status {
+	return u.status
+}
+
+// ----- Internal --------------------------------------------------------------
+func resolveUsers() (status Status) {
+	status = KEPT
+	for _, c := range users {
+		if c.status == PROMISED {
+			c.Resolve()
+			switch c.status {
+			case BROKEN:
+				return BROKEN
+			case REPAIRED:
+				status = REPAIRED
+			}
+		}
+	}
+	return
+}
diff --git a/stdlib/os/linux/useradd.go b/stdlib/os/linux/useradd.go
new file mode 100644
index 0000000..8dfee8b
--- /dev/null
+++ b/stdlib/os/linux/useradd.go
@@ -0,0 +1,26 @@
+package linux
+
+import (
+	"git.adyxax.org/adyxax/gonf/v2/pkg"
+	"os/exec"
+)
+
+func Useradd(data gonf.UserData) (gonf.Status, error) {
+	getent := exec.Command("getent", "passwd", data.Name)
+	if err := getent.Run(); err == nil {
+		return gonf.KEPT, nil
+	}
+	args := make([]string, 0)
+	if data.HomeDir != "" {
+		args = append(args, "--home-dir="+data.HomeDir)
+	}
+	if data.System {
+		args = append(args, "--system")
+	}
+	args = append(args, data.Name)
+	cmd := exec.Command("useradd", args...)
+	if err := cmd.Run(); err != nil {
+		return gonf.BROKEN, err
+	}
+	return gonf.REPAIRED, nil
+}
-- 
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