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authorDaniel J Walsh <dwalsh@redhat.com>2021-03-26 11:23:46 -0400
committerDaniel J Walsh <dwalsh@redhat.com>2021-03-26 13:57:27 -0400
commitfc197fb4f5c0e0d90da39fe672bce7d145272415 (patch)
tree56913b09296f1116d7d22d1bb938eba55d14c700 /vendor/golang.org/x/sys
parentfa6ba9b00fb5f77ead67b624be510ec50b2f4f5e (diff)
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[NO TESTS NEEDED] Vendor in containers/buildah v1.20.0
Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>
Diffstat (limited to 'vendor/golang.org/x/sys')
-rw-r--r--vendor/golang.org/x/sys/execabs/execabs.go102
1 files changed, 102 insertions, 0 deletions
diff --git a/vendor/golang.org/x/sys/execabs/execabs.go b/vendor/golang.org/x/sys/execabs/execabs.go
new file mode 100644
index 000000000..78192498d
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+++ b/vendor/golang.org/x/sys/execabs/execabs.go
@@ -0,0 +1,102 @@
+// Copyright 2020 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package execabs is a drop-in replacement for os/exec
+// that requires PATH lookups to find absolute paths.
+// That is, execabs.Command("cmd") runs the same PATH lookup
+// as exec.Command("cmd"), but if the result is a path
+// which is relative, the Run and Start methods will report
+// an error instead of running the executable.
+//
+// See https://blog.golang.org/path-security for more information
+// about when it may be necessary or appropriate to use this package.
+package execabs
+
+import (
+ "context"
+ "fmt"
+ "os/exec"
+ "path/filepath"
+ "reflect"
+ "unsafe"
+)
+
+// ErrNotFound is the error resulting if a path search failed to find an executable file.
+// It is an alias for exec.ErrNotFound.
+var ErrNotFound = exec.ErrNotFound
+
+// Cmd represents an external command being prepared or run.
+// It is an alias for exec.Cmd.
+type Cmd = exec.Cmd
+
+// Error is returned by LookPath when it fails to classify a file as an executable.
+// It is an alias for exec.Error.
+type Error = exec.Error
+
+// An ExitError reports an unsuccessful exit by a command.
+// It is an alias for exec.ExitError.
+type ExitError = exec.ExitError
+
+func relError(file, path string) error {
+ return fmt.Errorf("%s resolves to executable in current directory (.%c%s)", file, filepath.Separator, path)
+}
+
+// LookPath searches for an executable named file in the directories
+// named by the PATH environment variable. If file contains a slash,
+// it is tried directly and the PATH is not consulted. The result will be
+// an absolute path.
+//
+// LookPath differs from exec.LookPath in its handling of PATH lookups,
+// which are used for file names without slashes. If exec.LookPath's
+// PATH lookup would have returned an executable from the current directory,
+// LookPath instead returns an error.
+func LookPath(file string) (string, error) {
+ path, err := exec.LookPath(file)
+ if err != nil {
+ return "", err
+ }
+ if filepath.Base(file) == file && !filepath.IsAbs(path) {
+ return "", relError(file, path)
+ }
+ return path, nil
+}
+
+func fixCmd(name string, cmd *exec.Cmd) {
+ if filepath.Base(name) == name && !filepath.IsAbs(cmd.Path) {
+ // exec.Command was called with a bare binary name and
+ // exec.LookPath returned a path which is not absolute.
+ // Set cmd.lookPathErr and clear cmd.Path so that it
+ // cannot be run.
+ lookPathErr := (*error)(unsafe.Pointer(reflect.ValueOf(cmd).Elem().FieldByName("lookPathErr").Addr().Pointer()))
+ if *lookPathErr == nil {
+ *lookPathErr = relError(name, cmd.Path)
+ }
+ cmd.Path = ""
+ }
+}
+
+// CommandContext is like Command but includes a context.
+//
+// The provided context is used to kill the process (by calling os.Process.Kill)
+// if the context becomes done before the command completes on its own.
+func CommandContext(ctx context.Context, name string, arg ...string) *exec.Cmd {
+ cmd := exec.CommandContext(ctx, name, arg...)
+ fixCmd(name, cmd)
+ return cmd
+
+}
+
+// Command returns the Cmd struct to execute the named program with the given arguments.
+// See exec.Command for most details.
+//
+// Command differs from exec.Command in its handling of PATH lookups,
+// which are used when the program name contains no slashes.
+// If exec.Command would have returned an exec.Cmd configured to run an
+// executable from the current directory, Command instead
+// returns an exec.Cmd that will return an error from Start or Run.
+func Command(name string, arg ...string) *exec.Cmd {
+ cmd := exec.Command(name, arg...)
+ fixCmd(name, cmd)
+ return cmd
+}