github.com/sirkon/goproxy@v1.4.8/internal/run/run.go (about)

     1  // Copyright 2011 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  // Package run implements the ``go run'' command.
     6  package run
     7  
     8  import (
     9  	"fmt"
    10  	"os"
    11  	"strings"
    12  
    13  	"github.com/sirkon/goproxy/internal/base"
    14  	"github.com/sirkon/goproxy/internal/cfg"
    15  	"github.com/sirkon/goproxy/internal/load"
    16  	"github.com/sirkon/goproxy/internal/str"
    17  	"github.com/sirkon/goproxy/internal/work"
    18  )
    19  
    20  var CmdRun = &base.Command{
    21  	UsageLine: "go run [build flags] [-exec xprog] package [arguments...]",
    22  	Short:     "compile and run Go program",
    23  	Long: `
    24  Run compiles and runs the named main Go package.
    25  Typically the package is specified as a list of .go source files,
    26  but it may also be an import path, file system path, or pattern
    27  matching a single known package, as in 'go run .' or 'go run my/cmd'.
    28  
    29  By default, 'go run' runs the compiled binary directly: 'a.out arguments...'.
    30  If the -exec flag is given, 'go run' invokes the binary using xprog:
    31  	'xprog a.out arguments...'.
    32  If the -exec flag is not given, GOOS or GOARCH is different from the system
    33  default, and a program named go_$GOOS_$GOARCH_exec can be found
    34  on the current search path, 'go run' invokes the binary using that program,
    35  for example 'go_nacl_386_exec a.out arguments...'. This allows execution of
    36  cross-compiled programs when a simulator or other execution method is
    37  available.
    38  
    39  The exit status of Run is not the exit status of the compiled binary.
    40  
    41  For more about build flags, see 'go help build'.
    42  For more about specifying packages, see 'go help packages'.
    43  
    44  See also: go build.
    45  	`,
    46  }
    47  
    48  func init() {
    49  	CmdRun.Run = runRun // break init loop
    50  
    51  	work.AddBuildFlags(CmdRun)
    52  	CmdRun.Flag.Var((*base.StringsFlag)(&work.ExecCmd), "exec", "")
    53  }
    54  
    55  func printStderr(args ...interface{}) (int, error) {
    56  	return fmt.Fprint(os.Stderr, args...)
    57  }
    58  
    59  func runRun(cmd *base.Command, args []string) {
    60  	work.BuildInit()
    61  	var b work.Builder
    62  	b.Init()
    63  	b.Print = printStderr
    64  	i := 0
    65  	for i < len(args) && strings.HasSuffix(args[i], ".go") {
    66  		i++
    67  	}
    68  	var p *load.Package
    69  	if i > 0 {
    70  		files := args[:i]
    71  		for _, file := range files {
    72  			if strings.HasSuffix(file, "_test.go") {
    73  				// GoFilesPackage is going to assign this to TestGoFiles.
    74  				// Reject since it won't be part of the build.
    75  				base.Fatalf("go run: cannot run *_test.go files (%s)", file)
    76  			}
    77  		}
    78  		p = load.GoFilesPackage(files)
    79  	} else if len(args) > 0 && !strings.HasPrefix(args[0], "-") {
    80  		pkgs := load.PackagesAndErrors(args[:1])
    81  		if len(pkgs) > 1 {
    82  			var names []string
    83  			for _, p := range pkgs {
    84  				names = append(names, p.ImportPath)
    85  			}
    86  			base.Fatalf("go run: pattern %s matches multiple packages:\n\t%s", args[0], strings.Join(names, "\n\t"))
    87  		}
    88  		p = pkgs[0]
    89  		i++
    90  	} else {
    91  		base.Fatalf("go run: no go files listed")
    92  	}
    93  	cmdArgs := args[i:]
    94  
    95  	if p.Error != nil {
    96  		base.Fatalf("%s", p.Error)
    97  	}
    98  	p.Internal.OmitDebug = true
    99  	if len(p.DepsErrors) > 0 {
   100  		// Since these are errors in dependencies,
   101  		// the same error might show up multiple times,
   102  		// once in each package that depends on it.
   103  		// Only print each once.
   104  		printed := map[*load.PackageError]bool{}
   105  		for _, err := range p.DepsErrors {
   106  			if !printed[err] {
   107  				printed[err] = true
   108  				base.Errorf("%s", err)
   109  			}
   110  		}
   111  	}
   112  	base.ExitIfErrors()
   113  	if p.Name != "main" {
   114  		base.Fatalf("go run: cannot run non-main package")
   115  	}
   116  	p.Target = "" // must build - not up to date
   117  	var src string
   118  	if len(p.GoFiles) > 0 {
   119  		src = p.GoFiles[0]
   120  	} else if len(p.CgoFiles) > 0 {
   121  		src = p.CgoFiles[0]
   122  	} else {
   123  		// this case could only happen if the provided source uses cgo
   124  		// while cgo is disabled.
   125  		hint := ""
   126  		if !cfg.BuildContext.CgoEnabled {
   127  			hint = " (cgo is disabled)"
   128  		}
   129  		base.Fatalf("go run: no suitable source files%s", hint)
   130  	}
   131  	p.Internal.ExeName = src[:len(src)-len(".go")] // name temporary executable for first go file
   132  	a1 := b.LinkAction(work.ModeBuild, work.ModeBuild, p)
   133  	a := &work.Action{Mode: "go run", Func: buildRunProgram, Args: cmdArgs, Deps: []*work.Action{a1}}
   134  	b.Do(a)
   135  }
   136  
   137  // buildRunProgram is the action for running a binary that has already
   138  // been compiled. We ignore exit status.
   139  func buildRunProgram(b *work.Builder, a *work.Action) error {
   140  	cmdline := str.StringList(work.FindExecCmd(), a.Deps[0].Target, a.Args)
   141  	if cfg.BuildN || cfg.BuildX {
   142  		b.Showcmd("", "%s", strings.Join(cmdline, " "))
   143  		if cfg.BuildN {
   144  			return nil
   145  		}
   146  	}
   147  
   148  	base.RunStdin(cmdline)
   149  	return nil
   150  }