config: Fix bug in SDK's merging of duration_seconds shared config

Fixes the SDK's handling of `duration_sections` in the shared
credentials file or specified in multiple shared config and shared
credentials files under the same profile.

Fixes #1192

config/shared_config_test.go

@@ -534,6 +534,36 @@ func TestNewSharedConfig(t *testing.T) {
 			Profile:              "invaliddefaultsmode",
 			Err:                  fmt.Errorf("failed to load defaults_mode from shared config, invalid value: invalid"),
 		},
+		"merged profiles across files": {
+			ConfigFilenames:      []string{testConfigFilename},
+			CredentialsFilenames: []string{testCredentialsFilename},
+			Profile:              "merged_profiles",
+			Expected: SharedConfig{
+				Profile:             "merged_profiles",
+				RoleARN:             "creds_profile_arn",
+				RoleDurationSeconds: aws.Duration(1023 * time.Second),
+			},
+		},
+		"merged profiles across config files": {
+			ConfigFilenames:      []string{testConfigFilename, testConfigFilename},
+			CredentialsFilenames: []string{},
+			Profile:              "merged_profiles",
+			Expected: SharedConfig{
+				Profile:             "merged_profiles",
+				RoleARN:             "config_profile_arn",
+				RoleDurationSeconds: aws.Duration(3601 * time.Second),
+			},
+		},
+		"merged profiles across credentials files": {
+			ConfigFilenames:      []string{},
+			CredentialsFilenames: []string{testCredentialsFilename, testCredentialsFilename},
+			Profile:              "merged_profiles",
+			Expected: SharedConfig{
+				Profile:             "merged_profiles",
+				RoleARN:             "creds_profile_arn",
+				RoleDurationSeconds: aws.Duration(1023 * time.Second),
+			},
+		},
 	}
 
 	for name, c := range cases {
@@ -593,6 +623,12 @@ func TestLoadSharedConfigFromSection(t *testing.T) {
 			Profile:  "profile partial_creds",
 			Expected: SharedConfig{},
 		},
+		"profile with role duration": {
+			Profile: "profile with_role_duration",
+			Expected: SharedConfig{
+				RoleDurationSeconds: aws.Duration(3601 * time.Second),
+			},
+		},
 		"profile with complete creds": {
 			Profile: "profile complete_creds",
 			Expected: SharedConfig{
@@ -689,12 +725,12 @@ func TestLoadSharedConfigFromSection(t *testing.T) {
 				}
 				return
 			}
-
 			if err != nil {
 				t.Fatalf("expect no error, got %v", err)
 			}
-			if e, a := c.Expected, cfg; !reflect.DeepEqual(e, a) {
-				t.Errorf("expect %v, got %v", e, a)
+
+			if diff := cmp.Diff(c.Expected, cfg); diff != "" {
+				t.Errorf("expect shared config match\n%s", diff)
 			}
 		})
 	}

config/testdata/shared_config

@@ -13,6 +13,13 @@ aws_secret_access_key = SECRET
 [profile alt_profile_name]
 region = alt_profile_name_region
 
+[profile with_role_duration]
+duration_seconds = 3601
+
+[profile merged_profiles]
+duration_seconds = 3601
+role_arn = config_profile_arn
+
 [profile short_profile_name_first]
 region = short_profile_name_first_short
 

config/testdata/shared_credentials

@@ -18,3 +18,7 @@ region = eu-west-2
 
 [DONOTNORMALIZE]
 region = eu-west-3
+
+[merged_profiles]
+duration_seconds = 1023
+role_arn = creds_profile_arn

internal/ini/literal_tokens.go

@@ -216,22 +216,8 @@ func NewStringValue(str string) (Value, error) {
 
 // NewIntValue returns a Value type generated using an int64 input.
 func NewIntValue(i int64) (Value, error) {
-	return newValue(IntegerType, 10, []rune{rune(i)})
-}
-
-// Append will append values and change the type to a string
-// type.
-func (v *Value) Append(tok Token) {
-	r := tok.Raw()
-	if v.Type != QuotedStringType {
-		v.Type = StringType
-		r = tok.raw[1 : len(tok.raw)-1]
-	}
-	if tok.Type() != TokenLit {
-		v.raw = append(v.raw, tok.Raw()...)
-	} else {
-		v.raw = append(v.raw, r...)
-	}
+	v := strconv.FormatInt(i, 10)
+	return newValue(IntegerType, 10, []rune(v))
 }
 
 func (v Value) String() string {