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subgraph-oz/fs/resolve.go

55 lines
1.2 KiB

package fs
import (
"fmt"
"os/exec"
"path"
"path/filepath"
"strings"
)
func (fs *Filesystem) resolvePath(p string) ([]string, error) {
p, err := fs.resolveVars(p)
if err != nil {
return nil, err
}
return fs.resolveGlob(p)
}
func (fs *Filesystem) resolveVars(p string) (string, error) {
const pathVar = "${PATH}/"
const homeVar = "${HOME}"
const uidVar = "${UID}"
const userVar = "${USER}"
switch {
case strings.HasPrefix(p, pathVar):
resolved, err := exec.LookPath(p[len(pathVar):])
if err != nil {
return "", fmt.Errorf("failed to resolve %s", p)
}
return resolved, nil
case strings.HasPrefix(p, homeVar):
return path.Join(fs.user.HomeDir, p[len(homeVar):]), nil
case strings.Contains(p, uidVar):
return strings.Replace(p, uidVar, fs.user.Uid, -1), nil
case strings.Contains(p, userVar):
return strings.Replace(p, userVar, fs.user.Username, -1), nil
}
return p, nil
}
func (fs *Filesystem) resolveGlob(p string) ([]string, error) {
if !strings.Contains(p, "*") {
return []string{p}, nil
}
list, err := filepath.Glob(p)
if err != nil {
return nil, fmt.Errorf("failed to glob resolve %s: %v", p, err)
}
return list, nil
}