github.com/telepresenceio/telepresence/v2@v2.20.0-pro.6.0.20240517030216-236ea954e789/pkg/client/cli/intercept/prepare_mount_windows.go (about)

     1  package intercept
     2  
     3  import (
     4  	"fmt"
     5  	"os"
     6  
     7  	"github.com/telepresenceio/telepresence/v2/pkg/errcat"
     8  )
     9  
    10  func PrepareMount(_ string, mountPoint string) (string, error) {
    11  	var err error
    12  	if mountPoint == "" {
    13  		// Find a free drive letter. Background at T, loop around and skip C and D,
    14  		// A and B aren't often used nowadays. No floppy-disks.
    15  		for _, c := range "TUVXYZABEFGHIJKLMNOPQR" {
    16  			_, err = os.Stat(fmt.Sprintf(`%c:\`, c))
    17  			if os.IsNotExist(err) {
    18  				return fmt.Sprintf(`%c:`, c), nil
    19  			}
    20  		}
    21  		return "", errcat.User.New("found no available drive to use as mount point")
    22  	}
    23  
    24  	// Mount point must be a drive letter
    25  	ok := len(mountPoint) == 2 && mountPoint[1] == ':'
    26  	if ok {
    27  		dl := mountPoint[0]
    28  		ok = dl >= 'A' && dl <= 'Z' || dl >= 'a' && dl <= 'z'
    29  	}
    30  	if !ok {
    31  		err = errcat.User.New("mount point must be a drive letter followed by a colon")
    32  	}
    33  	return mountPoint, err
    34  }