Implements Windows volume/mount support

Based on WSL2 9p support: remaps windows paths to /mnt/<drive> locations for
both podman and Docker API clients.

Signed-off-by: Jason T. Greene <jason.greene@redhat.com>

1 files changed, 59 insertions, 0 deletions

diff --git a/pkg/specgen/winpath.go b/pkg/specgen/winpath.go
new file mode 100644
index 000000000..f4249fab1
--- /dev/null
+++ b/pkg/specgen/winpath.go
@@ -0,0 +1,59 @@
+package specgen
+
+import (
+	"fmt"
+	"strings"
+	"unicode"
+
+	"github.com/pkg/errors"
+)
+
+func isHostWinPath(path string) bool {
+	return shouldResolveWinPaths() && strings.HasPrefix(path, `\\`) || hasWinDriveScheme(path, 0) || winPathExists(path)
+}
+
+func hasWinDriveScheme(path string, start int) bool {
+	if len(path) < start+2 || path[start+1] != ':' {
+		return false
+	}
+
+	drive := rune(path[start])
+	return drive < unicode.MaxASCII && unicode.IsLetter(drive)
+}
+
+// Converts a Windows path to a WSL guest path if local env is a WSL linux guest or this is a Windows client.
+func ConvertWinMountPath(path string) (string, error) {
+	if !shouldResolveWinPaths() {
+		return path, nil
+	}
+
+	if strings.HasPrefix(path, "/") {
+		// Handle /[driveletter]/windows/path form (e.g. c:\Users\bar == /c/Users/bar)
+		if len(path) > 2 && path[2] == '/' && shouldResolveUnixWinVariant(path) {
+			drive := unicode.ToLower(rune(path[1]))
+			if unicode.IsLetter(drive) && drive <= unicode.MaxASCII {
+				return fmt.Sprintf("/mnt/%c/%s", drive, path[3:]), nil
+			}
+		}
+
+		// unix path - pass through
+		return path, nil
+	}
+
+	// Convert remote win client relative paths to absolute
+	path = resolveRelativeOnWindows(path)
+
+	// Strip extended marker prefix if present
+	path = strings.TrimPrefix(path, `\\?\`)
+
+	// Drive installed via wsl --mount
+	if strings.HasPrefix(path, `\\.\`) {
+		path = "/mnt/wsl/" + path[4:]
+	} else if len(path) > 1 && path[1] == ':' {
+		path = "/mnt/" + strings.ToLower(path[0:1]) + path[2:]
+	} else {
+		return path, errors.New("unsupported UNC path")
+	}
+
+	return strings.ReplaceAll(path, `\`, "/"), nil
+}