Fix loopvar behavior change linting error

cmd/check_imap_mailbox_basic/main.go

@@ -70,6 +70,13 @@ func main() {
  // sufficient work is in place to allow bulk processing if there is
  // sufficient interest.
  for i, account := range cfg.Accounts {
+ // Building with `go build -gcflags=all=-d=loopvar=2` identified this
+ // loop as compiling differently with Go 1.22 (per-iteration) loop
+ // semantics.
+ //
+ // As a workaround, we create a new variable for each iteration to
+ // work around potential issues with Go versions prior to Go 1.22.
+ account := account
 
  logger := cfg.Log.With().
  Str("username", account.Username).

cmd/check_imap_mailbox_basic/summary.go

@@ -37,6 +37,14 @@ func setSummary(accounts []config.MailAccount, nes *nagios.Plugin) {
  )
 
  for _, account := range accounts {
+ // Building with `go build -gcflags=all=-d=loopvar=2` identified this
+ // loop as compiling differently with Go 1.22 (per-iteration) loop
+ // semantics.
+ //
+ // As a workaround, we create a new variable for each iteration to
+ // work around potential issues with Go versions prior to Go 1.22.
+ account := account
+
  accountSummary := fmt.Sprintf(
  "* Account: %s%s** Folders: %s%s%s",
  account.Username,

cmd/check_imap_mailbox_oauth2/main.go

@@ -71,6 +71,13 @@ func main() {
  // sufficient work is in place to allow bulk processing if there is
  // sufficient interest.
  for i, account := range cfg.Accounts {
+ // Building with `go build -gcflags=all=-d=loopvar=2` identified this
+ // loop as compiling differently with Go 1.22 (per-iteration) loop
+ // semantics.
+ //
+ // As a workaround, we create a new variable for each iteration to
+ // work around potential issues with Go versions prior to Go 1.22.
+ account := account
 
  logger := cfg.Log.With().
  Str("client_id", account.OAuth2Settings.ClientID).

cmd/check_imap_mailbox_oauth2/summary.go

@@ -37,6 +37,14 @@ func setSummary(accounts []config.MailAccount, nes *nagios.Plugin) {
  )
 
  for _, account := range accounts {
+ // Building with `go build -gcflags=all=-d=loopvar=2` identified this
+ // loop as compiling differently with Go 1.22 (per-iteration) loop
+ // semantics.
+ //
+ // As a workaround, we create a new variable for each iteration to
+ // work around potential issues with Go versions prior to Go 1.22.
+ account := account
+
  accountSummary := fmt.Sprintf(
  "* Account: %s%s** Folders: %s%s%s",
  account.Username,

cmd/list-emails/main.go

@@ -88,6 +88,13 @@ func main() {
 
  // loop over accounts
  for i, account := range cfg.Accounts {
+ // Building with `go build -gcflags=all=-d=loopvar=2` identified this
+ // loop as compiling differently with Go 1.22 (per-iteration) loop
+ // semantics.
+ //
+ // As a workaround, we create a new variable for each iteration to
+ // work around potential issues with Go versions prior to Go 1.22.
+ account := account
 
  fmt.Println("Checking account:", account.Name)
 

internal/config/file.go

@@ -30,6 +30,14 @@ func (c *Config) readConfigFile(configFile ...string) ([]byte, error) {
  var finalErr error
 
  for _, file := range configFile {
+ // Building with `go build -gcflags=all=-d=loopvar=2` identified this
+ // loop as compiling differently with Go 1.22 (per-iteration) loop
+ // semantics.
+ //
+ // As a workaround, we create a new variable for each iteration to
+ // work around potential issues with Go versions prior to Go 1.22.
+ file := file
+
  c.Log.Debug().Str("config_file", file).Msg("Attempting to open config file")
 
  fh, err := os.Open(filepath.Clean(file))