67 lines
2 KiB
Go
67 lines
2 KiB
Go
package npm
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import (
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"bytes"
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"fmt"
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"io"
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"io/ioutil"
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"os"
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"os/exec"
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"strings"
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"github.com/pkg/errors"
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)
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// Pack runs `npm pack` in the given directory, packaging the Node.js app located there into a
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// tarball and returning it as `[]byte`. `stdout` is ignored for the command, as it does not
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// generate useful data.
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func Pack(dir string, stderr io.Writer) ([]byte, error) {
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// We pass `--loglevel=error` to prevent `npm` from printing warnings about missing
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// `description`, `repository`, and `license` fields in the package.json file.
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c := exec.Command("npm", "pack", "--loglevel=error")
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c.Dir = dir
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// Run the command. Note that `npm pack` doesn't have the ability to rename the resulting
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// filename, since it's meant to be uploaded directly to npm, which means that we have to get
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// that information by parsing the output of the command.
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var stdout bytes.Buffer
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c.Stdout = &stdout
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c.Stderr = os.Stderr
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if err := c.Run(); err != nil {
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return nil, err
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}
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packfile := strings.TrimSpace(stdout.String())
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defer os.Remove(packfile)
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packTarball, err := ioutil.ReadFile(packfile)
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if err != nil {
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return nil, fmt.Errorf(
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"npm pack completed successfully but the packed .tar.gz file was not generated")
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}
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return packTarball, nil
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}
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// Install runs `npm install` in the given directory, installing the dependencies for the Node.js
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// app located there.
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func Install(dir string, stdout, stderr io.Writer) error {
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// We pass `--loglevel=error` to prevent `npm` from printing warnings about missing
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// `description`, `repository`, and `license` fields in the package.json file.
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c := exec.Command("npm", "install", "--loglevel=error")
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c.Dir = dir
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// Run the command.
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c.Stdout = stdout
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c.Stderr = stderr
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if err := c.Run(); err != nil {
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return err
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}
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// Ensure the "node_modules" directory exists.
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if _, err := os.Stat("node_modules"); os.IsNotExist(err) {
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return errors.Errorf("npm install reported success, but node_modules directory is missing")
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}
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return nil
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}
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