httpcaddyfile: Add persist_config global option (#5339)

Co-authored-by: Francis Lavoie <lavofr@gmail.com>

2 files changed, 27 insertions, 0 deletions

diff --git a/caddyconfig/httpcaddyfile/httptype.go b/caddyconfig/httpcaddyfile/httptype.go
index 43d756f..50e98ac 100644
--- a/caddyconfig/httpcaddyfile/httptype.go
+++ b/caddyconfig/httpcaddyfile/httptype.go
@@ -286,6 +286,17 @@ func (st ServerType) Setup(inputServerBlocks []caddyfile.ServerBlock,
 	if adminConfig, ok := options["admin"].(*caddy.AdminConfig); ok && adminConfig != nil {
 		cfg.Admin = adminConfig
 	}
+
+	if pc, ok := options["persist_config"].(string); ok && pc == "off" {
+		if cfg.Admin == nil {
+			cfg.Admin = new(caddy.AdminConfig)
+		}
+		if cfg.Admin.Config == nil {
+			cfg.Admin.Config = new(caddy.ConfigSettings)
+		}
+		cfg.Admin.Config.Persist = new(bool)
+	}
+
 	if len(customLogs) > 0 {
 		if cfg.Logging == nil {
 			cfg.Logging = &caddy.Logging{
diff --git a/caddyconfig/httpcaddyfile/options.go b/caddyconfig/httpcaddyfile/options.go
index 1775c93..4e5212b 100644
--- a/caddyconfig/httpcaddyfile/options.go
+++ b/caddyconfig/httpcaddyfile/options.go
@@ -54,6 +54,7 @@ func init() {
 	RegisterGlobalOption("ocsp_stapling", parseOCSPStaplingOptions)
 	RegisterGlobalOption("log", parseLogOptions)
 	RegisterGlobalOption("preferred_chains", parseOptPreferredChains)
+	RegisterGlobalOption("persist_config", parseOptPersistConfig)
 }
 
 func parseOptTrue(d *caddyfile.Dispenser, _ any) (any, error) { return true, nil }
@@ -386,6 +387,21 @@ func parseOptOnDemand(d *caddyfile.Dispenser, _ any) (any, error) {
 	return ond, nil
 }
 
+func parseOptPersistConfig(d *caddyfile.Dispenser, _ any) (any, error) {
+	d.Next() // consume parameter name
+	if !d.Next() {
+		return "", d.ArgErr()
+	}
+	val := d.Val()
+	if d.Next() {
+		return "", d.ArgErr()
+	}
+	if val != "off" {
+		return "", d.Errf("persist_config must be 'off'")
+	}
+	return val, nil
+}
+
 func parseOptAutoHTTPS(d *caddyfile.Dispenser, _ any) (any, error) {
 	d.Next() // consume parameter name
 	if !d.Next() {