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Improve error message for COPY missing destination

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Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
This commit is contained in:
Sebastiaan van Stijn 2017-09-21 16:03:59 +02:00
parent c982ee805d
commit 5d05a82913
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GPG key ID: 76698F39D527CE8C
2 changed files with 6 additions and 6 deletions
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8
builder/dockerfile/instructions/parse.go
View file

@ -235,7 +235,7 @@ func parseLabel(req parseRequest) (*LabelCommand, error) {
func parseAdd(req parseRequest) (*AddCommand, error) { func parseAdd(req parseRequest) (*AddCommand, error) {
if len(req.args) < 2 { if len(req.args) < 2 {
return nil, errAtLeastTwoArguments("ADD") return nil, errNoDestinationArgument("ADD")
} }
flChown := req.flags.AddString("chown", "") flChown := req.flags.AddString("chown", "")
if err := req.flags.Parse(); err != nil { if err := req.flags.Parse(); err != nil {
@ -250,7 +250,7 @@ func parseAdd(req parseRequest) (*AddCommand, error) {
func parseCopy(req parseRequest) (*CopyCommand, error) { func parseCopy(req parseRequest) (*CopyCommand, error) {
if len(req.args) < 2 { if len(req.args) < 2 {
return nil, errAtLeastTwoArguments("COPY") return nil, errNoDestinationArgument("COPY")
} }
flChown := req.flags.AddString("chown", "") flChown := req.flags.AddString("chown", "")
flFrom := req.flags.AddString("from", "") flFrom := req.flags.AddString("from", "")
@ -622,8 +622,8 @@ func errExactlyOneArgument(command string) error {
return errors.Errorf("%s requires exactly one argument", command) return errors.Errorf("%s requires exactly one argument", command)
} }
func errAtLeastTwoArguments(command string) error { func errNoDestinationArgument(command string) error {
return errors.Errorf("%s requires at least two arguments", command) return errors.Errorf("%s requires at least two arguments, but only one was provided. Destination could not be determined.", command)
} }
func errBlankCommandNames(command string) error { func errBlankCommandNames(command string) error {

4
builder/dockerfile/instructions/parse_test.go
View file

@ -45,7 +45,7 @@ func TestCommandsAtLeastOneArgument(t *testing.T) {
} }
} }
func TestCommandsAtLeastTwoArgument(t *testing.T) { func TestCommandsNoDestinationArgument(t *testing.T) {
commands := []string{ commands := []string{
"ADD", "ADD",
"COPY", "COPY",
@ -55,7 +55,7 @@ func TestCommandsAtLeastTwoArgument(t *testing.T) {
ast, err := parser.Parse(strings.NewReader(command + " arg1")) ast, err := parser.Parse(strings.NewReader(command + " arg1"))
require.NoError(t, err) require.NoError(t, err)
_, err = ParseInstruction(ast.AST.Children[0]) _, err = ParseInstruction(ast.AST.Children[0])
assert.EqualError(t, err, errAtLeastTwoArguments(command).Error()) assert.EqualError(t, err, errNoDestinationArgument(command).Error())
} }
} }