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sys: compile volume-path regex once, and update GoDoc

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Ideally, we would construct this lazily, but adding a function and a
sync.Once felt like a bit "too much".

Also updated the GoDoc for some functions to better describe what they do.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
This commit is contained in:
Sebastiaan van Stijn 2022-10-14 16:39:11 +02:00
parent 8ee685662d
commit d422c87e44
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1 changed files with 13 additions and 10 deletions
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23
sys/filesys_windows.go
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@ -25,19 +25,22 @@ import (
"golang.org/x/sys/windows"
)
const (
// SddlAdministratorsLocalSystem is local administrators plus NT AUTHORITY\System
SddlAdministratorsLocalSystem = "D:P(A;OICI;GA;;;BA)(A;OICI;GA;;;SY)"
)
// SddlAdministratorsLocalSystem is local administrators plus NT AUTHORITY\System.
const SddlAdministratorsLocalSystem = "D:P(A;OICI;GA;;;BA)(A;OICI;GA;;;SY)"
// MkdirAllWithACL is a wrapper for MkdirAll that creates a directory
// ACL'd for Builtin Administrators and Local System.
func MkdirAllWithACL(path string, perm os.FileMode) error {
// volumePath is a regular expression to check if a path is a Windows
// volume path (e.g., "\\?\Volume{4c1b02c1-d990-11dc-99ae-806e6f6e6963}".
var volumePath = regexp.MustCompile(`^\\\\\?\\Volume{[a-z0-9-]+}$`)
// MkdirAllWithACL is a custom version of os.MkdirAll modified for use on Windows
// so that it is both volume path aware, and to create a directory
// an appropriate SDDL defined ACL for Builtin Administrators and Local System.
func MkdirAllWithACL(path string, _ os.FileMode) error {
return mkdirall(path, true)
}
// MkdirAll implementation that is volume path aware for Windows. It can be used
// as a drop-in replacement for os.MkdirAll()
// MkdirAll is a custom version of os.MkdirAll that is volume path aware for
// Windows. It can be used as a drop-in replacement for os.MkdirAll.
func MkdirAll(path string, _ os.FileMode) error {
return mkdirall(path, false)
}
@ -46,7 +49,7 @@ func MkdirAll(path string, _ os.FileMode) error {
// so that it is both volume path aware, and can create a directory with
// a DACL.
func mkdirall(path string, adminAndLocalSystem bool) error {
if re := regexp.MustCompile(`^\\\\\?\\Volume{[a-z0-9-]+}$`); re.MatchString(path) {
if volumePath.MatchString(path) {
return nil
}