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78 lines
1.5 KiB
78 lines
1.5 KiB
package fs
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import (
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"fmt"
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"os"
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"os/exec"
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"os/user"
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"path"
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"path/filepath"
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"strings"
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)
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func resolvePath(p string, u *user.User) ([]string, error) {
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p, err := resolveVars(p, u)
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if err != nil {
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return nil, err
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}
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return resolveGlob(p)
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}
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func resolveVars(p string, u *user.User) (string, error) {
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const pathVar = "${PATH}/"
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const homeVar = "${HOME}"
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const uidVar = "${UID}"
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const userVar = "${USER}"
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switch {
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case strings.HasPrefix(p, pathVar):
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emptyPath := false
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if os.Getenv("PATH") == "" {
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emptyPath = true
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os.Setenv("PATH", "/bin:/usr/bin:/sbin:/usr/sbin")
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}
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resolved, err := exec.LookPath(p[len(pathVar):])
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if emptyPath {
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os.Setenv("PATH", "") // Do not use Unsetenv, incompatible with golang 1.3
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}
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if err != nil {
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return "", fmt.Errorf("failed to resolve %s", p)
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}
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return resolved, nil
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case strings.HasPrefix(p, homeVar):
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if u == nil {
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return p, nil
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}
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return path.Join(u.HomeDir, p[len(homeVar):]), nil
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case strings.Contains(p, uidVar):
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if u == nil {
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return p, nil
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}
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return strings.Replace(p, uidVar, u.Uid, -1), nil
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case strings.Contains(p, userVar):
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if u == nil {
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return p, nil
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}
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return strings.Replace(p, userVar, u.Username, -1), nil
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}
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return p, nil
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}
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func isGlobbed(p string) bool {
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return strings.Contains(p, "*")
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}
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func resolveGlob(p string) ([]string, error) {
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if !isGlobbed(p) {
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return []string{p}, nil
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}
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list, err := filepath.Glob(p)
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if err != nil {
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return nil, fmt.Errorf("failed to glob resolve %s: %v", p, err)
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}
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return list, nil
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}
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