tartrazine/internal/tests/utils.go

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package tests
import (
"fmt"
"io/ioutil"
"os"
"os/exec"
)
// Re-used by the packages: enry (test), enry (benchmark) and code-generator (test).
// Does not rely on testify, panics on errors so that there always is a trace to the caller.
func MaybeCloneLinguist(envVar, url, commit string) (string, bool, error) {
var err error
linguistTmpDir := os.Getenv(envVar)
isCleanupNeeded := false
isLinguistCloned := linguistTmpDir != ""
if !isLinguistCloned {
linguistTmpDir, err = ioutil.TempDir("", "linguist-")
if err != nil {
panic(err)
}
isCleanupNeeded = true
cmd := exec.Command("git", "clone", "--depth", "150", url, linguistTmpDir)
if err := cmd.Run(); err != nil {
panicOn(cmd.String(), err)
}
}
cwd, err := os.Getwd()
if err != nil {
panic(err)
}
if err = os.Chdir(linguistTmpDir); err != nil {
panic(err)
}
cmd := exec.Command("git", "checkout", commit)
if err := cmd.Run(); err != nil {
panicOn(cmd.String(), err)
}
if err = os.Chdir(cwd); err != nil {
panicOn(cmd.String(), err)
}
return linguistTmpDir, isCleanupNeeded, nil
}
func panicOn(cmd string, err error) {
panic(fmt.Errorf("%q returned %w", cmd, err))
}