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fix(agent/usershell): check shell on darwin via dscl #8366

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Merged
merged 2 commits into from
Jul 11, 2023
Merged

fix(agent/usershell): check shell on darwin via dscl #8366

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39a9bab
fix(agent/usershell): check shell on darwin via dscl
mafredri Jul 7, 2023
433dd87
Merge branch 'main' into mafredri/fix-darwin-usershell
mafredri Jul 11, 2023
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23 changes: 20 additions & 3 deletions agent/usershell/usershell_darwin.go
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Original file line number Diff line number Diff line change
@@ -1,8 +1,25 @@
package usershell

import "os"
import (
"os"
"os/exec"
"path/filepath"
"strings"

"golang.org/x/xerrors"
)

// Get returns the $SHELL environment variable.
func Get(_ string) (string, error) {
return os.Getenv("SHELL"), nil
func Get(username string) (string, error) {
// This command will output "UserShell: /bin/zsh" if successful, we
// can ignore the error since we have fallback behavior.
out, _ := exec.Command("dscl", ".", "-read", filepath.Join("/Users", username), "UserShell").Output()
s, ok := strings.CutPrefix(string(out), "UserShell: ")
if ok {
return strings.TrimSpace(s), nil
}
if s = os.Getenv("SHELL"); s != "" {
return s, nil
}
return "", xerrors.Errorf("shell for user %q not found via dscl or in $SHELL", username)
}
5 changes: 4 additions & 1 deletion agent/usershell/usershell_other.go
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Original file line number Diff line number Diff line change
Expand Up @@ -27,5 +27,8 @@ func Get(username string) (string, error) {
}
return parts[6], nil
}
return "", xerrors.Errorf("user %q not found in /etc/passwd", username)
if s := os.Getenv("SHELL"); s != "" {
return s, nil
}
return "", xerrors.Errorf("shell for user %q not found in /etc/passwd or $SHELL", username)
}
27 changes: 0 additions & 27 deletions agent/usershell/usershell_other_test.go
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46 changes: 46 additions & 0 deletions agent/usershell/usershell_test.go
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Original file line number Diff line number Diff line change
@@ -0,0 +1,46 @@
package usershell_test

import (
"os/user"
"runtime"
"testing"

"github.com/stretchr/testify/require"

"github.com/coder/coder/agent/usershell"
)

//nolint:paralleltest,tparallel // This test sets an environment variable.
func TestGet(t *testing.T) {
if runtime.GOOS == "windows" {
t.SkipNow()
}

t.Run("Fallback", func(t *testing.T) {
t.Setenv("SHELL", "/bin/sh")

t.Run("NonExistentUser", func(t *testing.T) {
shell, err := usershell.Get("notauser")
require.NoError(t, err)
require.Equal(t, "/bin/sh", shell)
})
})

t.Run("NoFallback", func(t *testing.T) {
// Disable env fallback for these tests.
t.Setenv("SHELL", "")

t.Run("NotFound", func(t *testing.T) {
_, err := usershell.Get("notauser")
require.Error(t, err)
})

t.Run("User", func(t *testing.T) {
u, err := user.Current()
require.NoError(t, err)
shell, err := usershell.Get(u.Username)
require.NoError(t, err)
require.NotEmpty(t, shell)
})
})
}