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package open
import (
"errors"
"fmt"
"syscall"
)
// InChroot opens the file at `path` after chrooting to `root` and then
// changing its working directory to `wd`. Both `wd` and `path` are evaluated
// in the chroot.
// Returns a file handle, an Errno value if there was an error and the
// underlying error was a standard library error code, and a non-empty error if
// one was detected.
func InChroot(root, wd, path string, mode int, perm uint32) (fd int, errno syscall.Errno, err error) {
requests := requests{
Root: root,
Wd: wd,
Open: []request{
{
Path: path,
Mode: mode,
Perms: perm,
},
},
}
results := inChroot(requests)
if len(results.Open) != 1 {
return -1, 0, fmt.Errorf("got %d results back instead of 1", len(results.Open))
}
if results.Open[0].Err != "" {
if results.Open[0].Errno != 0 {
err = fmt.Errorf("%s: %w", results.Open[0].Err, results.Open[0].Errno)
} else {
err = errors.New(results.Open[0].Err)
}
}
return int(results.Open[0].Fd), results.Open[0].Errno, err
}
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