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idtools: add lookup by UID with libsubid #1265

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merged 1 commit into from
Jun 16, 2022
Merged

idtools: add lookup by UID with libsubid #1265

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17 changes: 17 additions & 0 deletions pkg/idtools/idtools_supported.go
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Original file line number Diff line number Diff line change
@@ -1,8 +1,10 @@
//go:build linux && cgo && libsubid
// +build linux,cgo,libsubid

package idtools

import (
"os/user"
"unsafe"

"github.com/pkg/errors"
Expand Down Expand Up @@ -32,19 +34,34 @@ import "C"

func readSubid(username string, isUser bool) (ranges, error) {
var ret ranges
uidstr := ""

if username == "ALL" {
return nil, errors.New("username ALL not supported")
}

if u, err := user.Lookup(username); err == nil {
uidstr = u.Uid
}

cUsername := C.CString(username)
defer C.free(unsafe.Pointer(cUsername))

cuidstr := C.CString(uidstr)
defer C.free(unsafe.Pointer(cuidstr))

var nRanges C.int
var cRanges *C.struct_subid_range
if isUser {
nRanges = C.subid_get_uid_ranges(cUsername, &cRanges)
if nRanges <= 0 {
nRanges = C.subid_get_uid_ranges(cuidstr, &cRanges)
}
} else {
nRanges = C.subid_get_gid_ranges(cUsername, &cRanges)
if nRanges <= 0 {
nRanges = C.subid_get_gid_ranges(cuidstr, &cRanges)
}
}
if nRanges < 0 {
return nil, errors.New("cannot read subids")
Expand Down