parse: don't use stdin if there are arguments

This should fix issue #1141 (ipfs cat "multihash too short"
error when using stdin) and perhaps others.

License: MIT
Signed-off-by: Christian Couder <chriscool@tuxfamily.org>

commands/cli/parse.go

@@ -255,13 +255,17 @@ func parseArgs(inputs []string, stdin *os.File, argDefs []cmds.Argument, recursi
 				stringArgs, inputs = appendString(stringArgs, inputs)
 
 			} else if argDef.SupportsStdin {
-				// if we have a stdin, read it in and use the data as a string value
-				stringArgs, stdin, err = appendStdinAsString(stringArgs, stdin)
-				if err != nil {
-					return nil, nil, err
+				if len(inputs) > 0 {
+					// don't use stdin if we have inputs
+					stdin = nil
+				} else {
+					// if we have a stdin, read it in and use the data as a string value
+					stringArgs, stdin, err = appendStdinAsString(stringArgs, stdin)
+					if err != nil {
+						return nil, nil, err
+					}
 				}
 			}
-
 		} else if argDef.Type == cmds.ArgFile {
 			if stdin == nil {
 				// treat stringArg values as file paths
@@ -271,8 +275,13 @@ func parseArgs(inputs []string, stdin *os.File, argDefs []cmds.Argument, recursi
 				}
 
 			} else if argDef.SupportsStdin {
-				// if we have a stdin, create a file from it
-				fileArgs, stdin = appendStdinAsFile(fileArgs, stdin)
+				if len(inputs) > 0 {
+					// don't use stdin if we have inputs
+					stdin = nil
+				} else {
+					// if we have a stdin, create a file from it
+					fileArgs, stdin = appendStdinAsFile(fileArgs, stdin)
+				}
 			}
 		}
 

commands/cli/parse_test.go

@@ -222,8 +222,8 @@ func TestArgumentParsing(t *testing.T) {
 	fstdin := fileToSimulateStdin(t, "stdin1")
 
 	test([]string{"stdinenabled"}, fstdin, []string{"stdin1"})
-	test([]string{"stdinenabled", "value1"}, fstdin, []string{"stdin1", "value1"})
-	test([]string{"stdinenabled", "value1", "value2"}, fstdin, []string{"stdin1", "value1", "value2"})
+	test([]string{"stdinenabled", "value1"}, fstdin, []string{"value1"})
+	test([]string{"stdinenabled", "value1", "value2"}, fstdin, []string{"value1", "value2"})
 
 	fstdin = fileToSimulateStdin(t, "stdin1\nstdin2")
 	test([]string{"stdinenabled"}, fstdin, []string{"stdin1", "stdin2"})