borrow wrappedreadline workarounds from terraform and implement a similar check for piped commands; this makes the cli experience much cleaner
This commit is contained in:
parent
b8ac1a800d
commit
df916e805e
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@ -1,11 +1,14 @@
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package command
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package command
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import (
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import (
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"bufio"
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"errors"
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"errors"
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"fmt"
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"fmt"
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"io"
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"io"
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"strings"
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"strings"
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"github.com/chzyer/readline"
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"github.com/hashicorp/packer/helper/wrappedreadline"
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"github.com/hashicorp/packer/packer"
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"github.com/hashicorp/packer/packer"
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"github.com/hashicorp/packer/template"
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"github.com/hashicorp/packer/template"
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"github.com/hashicorp/packer/template/interpolate"
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"github.com/hashicorp/packer/template/interpolate"
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@ -70,6 +73,11 @@ func (c *ConsoleCommand) Run(args []string) int {
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Core: core,
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Core: core,
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}
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}
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// Determine if stdin is a pipe. If so, we evaluate directly.
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if c.StdinPiped() {
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return c.modePiped(session)
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}
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return c.modeInteractive(session)
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return c.modeInteractive(session)
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}
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}
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@ -105,12 +113,45 @@ func (*ConsoleCommand) AutocompleteFlags() complete.Flags {
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}
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}
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}
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}
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func (c *ConsoleCommand) modeInteractive(session *REPLSession) int {
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func (c *ConsoleCommand) modePiped(session *REPLSession) int {
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var lastResult string
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scanner := bufio.NewScanner(wrappedreadline.Stdin())
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for scanner.Scan() {
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result, err := session.Handle(strings.TrimSpace(scanner.Text()))
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if err != nil {
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return 0
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}
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// Store the last result
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lastResult = result
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}
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// Output the final result
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c.Ui.Message(lastResult)
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return 0
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}
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func (c *ConsoleCommand) modeInteractive(session *REPLSession) int { // Setup the UI so we can output directly to stdout
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l, err := readline.NewEx(wrappedreadline.Override(&readline.Config{
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Prompt: "> ",
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InterruptPrompt: "^C",
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EOFPrompt: "exit",
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HistorySearchFold: true,
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}))
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if err != nil {
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c.Ui.Error(fmt.Sprintf(
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"Error initializing console: %s",
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err))
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return 1
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}
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for {
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for {
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// Read a line
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// Read a line
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line, err := c.Ui.Ask("> ")
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line, err := l.Readline()
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if err == packer.ErrInterrupted {
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if err == readline.ErrInterrupt {
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break
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if len(line) == 0 {
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break
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} else {
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continue
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}
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} else if err == io.EOF {
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} else if err == io.EOF {
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break
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break
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}
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}
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@ -144,6 +185,8 @@ type REPLSession struct {
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// The return value is the output and the error to show.
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// The return value is the output and the error to show.
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func (s *REPLSession) Handle(line string) (string, error) {
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func (s *REPLSession) Handle(line string) (string, error) {
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switch {
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switch {
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case strings.TrimSpace(line) == "":
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return "", nil
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case strings.TrimSpace(line) == "exit":
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case strings.TrimSpace(line) == "exit":
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return "", ErrSessionExit
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return "", ErrSessionExit
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case strings.TrimSpace(line) == "help":
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case strings.TrimSpace(line) == "help":
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@ -5,9 +5,11 @@ import (
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"flag"
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"flag"
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"fmt"
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"fmt"
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"io"
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"io"
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"os"
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kvflag "github.com/hashicorp/packer/helper/flag-kv"
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kvflag "github.com/hashicorp/packer/helper/flag-kv"
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sliceflag "github.com/hashicorp/packer/helper/flag-slice"
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sliceflag "github.com/hashicorp/packer/helper/flag-slice"
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"github.com/hashicorp/packer/helper/wrappedreadline"
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"github.com/hashicorp/packer/packer"
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"github.com/hashicorp/packer/packer"
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"github.com/hashicorp/packer/template"
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"github.com/hashicorp/packer/template"
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)
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)
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@ -140,3 +142,14 @@ func (m *Meta) ValidateFlags() error {
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// TODO
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// TODO
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return nil
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return nil
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}
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}
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// StdinPiped returns true if the input is piped.
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func (m *Meta) StdinPiped() bool {
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fi, err := wrappedreadline.Stdin().Stat()
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if err != nil {
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// If there is an error, let's just say its not piped
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return false
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}
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return fi.Mode()&os.ModeNamedPipe != 0
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}
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1
go.mod
1
go.mod
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@ -22,6 +22,7 @@ require (
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github.com/biogo/hts v0.0.0-20160420073057-50da7d4131a3
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github.com/biogo/hts v0.0.0-20160420073057-50da7d4131a3
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github.com/c2h5oh/datasize v0.0.0-20171227191756-4eba002a5eae
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github.com/c2h5oh/datasize v0.0.0-20171227191756-4eba002a5eae
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github.com/cheggaaa/pb v1.0.27
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github.com/cheggaaa/pb v1.0.27
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github.com/chzyer/readline v0.0.0-20180603132655-2972be24d48e
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github.com/creack/goselect v0.1.0 // indirect
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github.com/creack/goselect v0.1.0 // indirect
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github.com/dgrijalva/jwt-go v3.2.0+incompatible
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github.com/dgrijalva/jwt-go v3.2.0+incompatible
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github.com/digitalocean/godo v1.11.1
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github.com/digitalocean/godo v1.11.1
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2
go.sum
2
go.sum
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@ -76,6 +76,8 @@ github.com/census-instrumentation/opencensus-proto v0.2.0 h1:LzQXZOgg4CQfE6bFvXG
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github.com/census-instrumentation/opencensus-proto v0.2.0/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
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github.com/census-instrumentation/opencensus-proto v0.2.0/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
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github.com/cheggaaa/pb v1.0.27 h1:wIkZHkNfC7R6GI5w7l/PdAdzXzlrbcI3p8OAlnkTsnc=
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github.com/cheggaaa/pb v1.0.27 h1:wIkZHkNfC7R6GI5w7l/PdAdzXzlrbcI3p8OAlnkTsnc=
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github.com/cheggaaa/pb v1.0.27/go.mod h1:pQciLPpbU0oxA0h+VJYYLxO+XeDQb5pZijXscXHm81s=
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github.com/cheggaaa/pb v1.0.27/go.mod h1:pQciLPpbU0oxA0h+VJYYLxO+XeDQb5pZijXscXHm81s=
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github.com/chzyer/readline v0.0.0-20180603132655-2972be24d48e h1:fY5BOSpyZCqRo5OhCuC+XN+r/bBCmeuuJtjz+bCNIf8=
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github.com/chzyer/readline v0.0.0-20180603132655-2972be24d48e/go.mod h1:nSuG5e5PlCu98SY8svDHJxuZscDgtXS6KTTbou5AhLI=
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github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
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github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
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github.com/coreos/go-systemd v0.0.0-20181012123002-c6f51f82210d/go.mod h1:F5haX7vjVVG0kc13fIWeqUViNPyEJxv/OmvnBo0Yme4=
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github.com/coreos/go-systemd v0.0.0-20181012123002-c6f51f82210d/go.mod h1:F5haX7vjVVG0kc13fIWeqUViNPyEJxv/OmvnBo0Yme4=
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github.com/creack/goselect v0.1.0 h1:4QiXIhcpSQF50XGaBsFzesjwX/1qOY5bOveQPmN9CXY=
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github.com/creack/goselect v0.1.0 h1:4QiXIhcpSQF50XGaBsFzesjwX/1qOY5bOveQPmN9CXY=
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@ -0,0 +1,125 @@
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// Shamelessly copied from the Terraform repo because it wasn't worth vendoring
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// out two hundred lines of code so Packer could use it too.
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//
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// wrappedreadline is a package that has helpers for interacting with
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// readline from a panicwrap executable.
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//
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// panicwrap overrides the standard file descriptors so that the child process
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// no longer looks like a TTY. The helpers here access the extra file descriptors
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// passed by panicwrap to fix that.
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//
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// panicwrap should be checked for with panicwrap.Wrapped before using this
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// librar, since this library won't adapt if the binary is not wrapped.
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package wrappedreadline
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import (
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"os"
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"runtime"
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"github.com/chzyer/readline"
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"github.com/mitchellh/panicwrap"
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)
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// Override overrides the values in readline.Config that need to be
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// set with wrapped values.
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func Override(cfg *readline.Config) *readline.Config {
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cfg.Stdin = Stdin()
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cfg.Stdout = Stdout()
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cfg.Stderr = Stderr()
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cfg.FuncGetWidth = TerminalWidth
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cfg.FuncIsTerminal = IsTerminal
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rm := RawMode{StdinFd: int(Stdin().Fd())}
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cfg.FuncMakeRaw = rm.Enter
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cfg.FuncExitRaw = rm.Exit
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return cfg
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}
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// IsTerminal determines if this process is attached to a TTY.
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func IsTerminal() bool {
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// Windows is always a terminal
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if runtime.GOOS == "windows" {
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return true
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}
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// Same implementation as readline but with our custom fds
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return readline.IsTerminal(int(Stdin().Fd())) &&
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(readline.IsTerminal(int(Stdout().Fd())) ||
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readline.IsTerminal(int(Stderr().Fd())))
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}
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// TerminalWidth gets the terminal width in characters.
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func TerminalWidth() int {
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if runtime.GOOS == "windows" {
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return readline.GetScreenWidth()
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}
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return getWidth()
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}
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// RawMode is a helper for entering and exiting raw mode.
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type RawMode struct {
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StdinFd int
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state *readline.State
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}
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func (r *RawMode) Enter() (err error) {
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r.state, err = readline.MakeRaw(r.StdinFd)
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return err
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}
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func (r *RawMode) Exit() error {
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if r.state == nil {
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return nil
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}
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return readline.Restore(r.StdinFd, r.state)
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}
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// Package provides access to the standard OS streams
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// (stdin, stdout, stderr) even if wrapped under panicwrap.
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// Stdin returns the true stdin of the process.
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func Stdin() *os.File {
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stdin := os.Stdin
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if panicwrap.Wrapped(nil) {
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stdin = wrappedStdin
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}
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return stdin
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}
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// Stdout returns the true stdout of the process.
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func Stdout() *os.File {
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stdout := os.Stdout
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if panicwrap.Wrapped(nil) {
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stdout = wrappedStdout
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}
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return stdout
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}
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// Stderr returns the true stderr of the process.
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func Stderr() *os.File {
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stderr := os.Stderr
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if panicwrap.Wrapped(nil) {
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stderr = wrappedStderr
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}
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return stderr
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}
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// These are the wrapped standard streams. These are setup by the
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// platform specific code in initPlatform.
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var (
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wrappedStdin *os.File
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wrappedStdout *os.File
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wrappedStderr *os.File
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)
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func init() {
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// Initialize the platform-specific code
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initPlatform()
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}
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@ -0,0 +1,52 @@
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// +build darwin dragonfly freebsd linux,!appengine netbsd openbsd
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package wrappedreadline
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import (
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"os"
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"syscall"
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|
"unsafe"
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)
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|
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// getWidth impl for Unix
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func getWidth() int {
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stdoutFd := int(Stdout().Fd())
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stderrFd := int(Stderr().Fd())
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|
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w := getWidthFd(stdoutFd)
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|
if w < 0 {
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w = getWidthFd(stderrFd)
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|
}
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|
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|
return w
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|
}
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|
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type winsize struct {
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Row uint16
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|
Col uint16
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|
Xpixel uint16
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|
Ypixel uint16
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}
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|
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// get width of the terminal
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func getWidthFd(stdoutFd int) int {
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ws := &winsize{}
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|
retCode, _, errno := syscall.Syscall(syscall.SYS_IOCTL,
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|
uintptr(stdoutFd),
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|
uintptr(syscall.TIOCGWINSZ),
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|
uintptr(unsafe.Pointer(ws)))
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|
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|
if int(retCode) == -1 {
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|
_ = errno
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|
return -1
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|
}
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|
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|
return int(ws.Col)
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|
}
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|
|
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|
func initPlatform() {
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|
// The standard streams are passed in via extra file descriptors.
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|
wrappedStdin = os.NewFile(uintptr(3), "stdin")
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wrappedStdout = os.NewFile(uintptr(4), "stdout")
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wrappedStderr = os.NewFile(uintptr(5), "stderr")
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|
}
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|
@ -0,0 +1,57 @@
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|
// +build windows
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|
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package wrappedreadline
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|
|
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|
import (
|
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"log"
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||||||
|
"os"
|
||||||
|
"syscall"
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)
|
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|
|
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// getWidth impl for other
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|
func getWidth() int {
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|
return 0
|
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|
}
|
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|
|
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|
func initPlatform() {
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||||||
|
wrappedStdin = openConsole("CONIN$", os.Stdin)
|
||||||
|
wrappedStdout = openConsole("CONOUT$", os.Stdout)
|
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|
wrappedStderr = wrappedStdout
|
||||||
|
}
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|
|
||||||
|
// openConsole opens a console handle, using a backup if it fails.
|
||||||
|
// This is used to get the exact console handle instead of the redirected
|
||||||
|
// handles from panicwrap.
|
||||||
|
func openConsole(name string, backup *os.File) *os.File {
|
||||||
|
// Convert to UTF16
|
||||||
|
path, err := syscall.UTF16PtrFromString(name)
|
||||||
|
if err != nil {
|
||||||
|
log.Printf("[ERROR] wrappedstreams: %s", err)
|
||||||
|
return backup
|
||||||
|
}
|
||||||
|
|
||||||
|
// Determine the share mode
|
||||||
|
var shareMode uint32
|
||||||
|
switch name {
|
||||||
|
case "CONIN$":
|
||||||
|
shareMode = syscall.FILE_SHARE_READ
|
||||||
|
case "CONOUT$":
|
||||||
|
shareMode = syscall.FILE_SHARE_WRITE
|
||||||
|
}
|
||||||
|
|
||||||
|
// Get the file
|
||||||
|
h, err := syscall.CreateFile(
|
||||||
|
path,
|
||||||
|
syscall.GENERIC_READ|syscall.GENERIC_WRITE,
|
||||||
|
shareMode,
|
||||||
|
nil,
|
||||||
|
syscall.OPEN_EXISTING,
|
||||||
|
0, 0)
|
||||||
|
if err != nil {
|
||||||
|
log.Printf("[ERROR] wrappedstreams: %s", err)
|
||||||
|
return backup
|
||||||
|
}
|
||||||
|
|
||||||
|
// Create the Go file
|
||||||
|
return os.NewFile(uintptr(h), name)
|
||||||
|
}
|
Loading…
Reference in New Issue