toolexec.go

Documentation: cmd/cover/testdata

     1  // Copyright 2018 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  // The toolexec program is a helper program for cmd/cover tests.
     6  // It is used so that the go tool will call the newly built version
     7  // of the cover program, rather than the installed one.
     8  //
     9  // The tests arrange to run the go tool with the argument
    10  //    -toolexec="/path/to/toolexec /path/to/testcover"
    11  // The go tool will invoke this program (compiled into /path/to/toolexec)
    12  // with the arguments shown above followed by the command to run.
    13  // This program will check whether it is expected to run the cover
    14  // program, and if so replace it with /path/to/testcover.
    15  package main
    16  
    17  import (
    18  	exec "internal/execabs"
    19  	"os"
    20  	"strings"
    21  )
    22  
    23  func main() {
    24  	if strings.HasSuffix(strings.TrimSuffix(os.Args[2], ".exe"), "cover") {
    25  		os.Args[2] = os.Args[1]
    26  	}
    27  	cmd := exec.Command(os.Args[2], os.Args[3:]...)
    28  	cmd.Stdout = os.Stdout
    29  	cmd.Stderr = os.Stderr
    30  	if err := cmd.Run(); err != nil {
    31  		os.Exit(1)
    32  	}
    33  }
    34
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