Ophestra
c6be82bcf9
All checks were successful
Test / Create distribution (push) Successful in 33s
Test / Sandbox (push) Successful in 2m6s
Test / Hakurei (push) Successful in 3m6s
Test / Sandbox (race detector) (push) Successful in 4m14s
Test / Hpkg (push) Successful in 4m11s
Test / Hakurei (race detector) (push) Successful in 4m40s
Test / Flake checks (push) Successful in 1m18s
This increases readability since this can help disambiguate absolute paths from similarly named path segments. Signed-off-by: Ophestra <cat@gensokyo.uk>
48 lines
1.5 KiB
Go
48 lines
1.5 KiB
Go
package container
|
|
|
|
import (
|
|
"bytes"
|
|
"log"
|
|
"os"
|
|
"strconv"
|
|
"sync"
|
|
)
|
|
|
|
var (
|
|
kernelOverflowuid int
|
|
kernelOverflowgid int
|
|
kernelCapLastCap int
|
|
|
|
sysctlOnce sync.Once
|
|
)
|
|
|
|
const (
|
|
kernelOverflowuidPath = FHSProcSys + "kernel/overflowuid"
|
|
kernelOverflowgidPath = FHSProcSys + "kernel/overflowgid"
|
|
kernelCapLastCapPath = FHSProcSys + "kernel/cap_last_cap"
|
|
)
|
|
|
|
func mustReadSysctl() {
|
|
if v, err := os.ReadFile(kernelOverflowuidPath); err != nil {
|
|
log.Fatalf("cannot read %q: %v", kernelOverflowuidPath, err)
|
|
} else if kernelOverflowuid, err = strconv.Atoi(string(bytes.TrimSpace(v))); err != nil {
|
|
log.Fatalf("cannot interpret %q: %v", kernelOverflowuidPath, err)
|
|
}
|
|
|
|
if v, err := os.ReadFile(kernelOverflowgidPath); err != nil {
|
|
log.Fatalf("cannot read %q: %v", kernelOverflowgidPath, err)
|
|
} else if kernelOverflowgid, err = strconv.Atoi(string(bytes.TrimSpace(v))); err != nil {
|
|
log.Fatalf("cannot interpret %q: %v", kernelOverflowgidPath, err)
|
|
}
|
|
|
|
if v, err := os.ReadFile(kernelCapLastCapPath); err != nil {
|
|
log.Fatalf("cannot read %q: %v", kernelCapLastCapPath, err)
|
|
} else if kernelCapLastCap, err = strconv.Atoi(string(bytes.TrimSpace(v))); err != nil {
|
|
log.Fatalf("cannot interpret %q: %v", kernelCapLastCapPath, err)
|
|
}
|
|
}
|
|
|
|
func OverflowUid() int { sysctlOnce.Do(mustReadSysctl); return kernelOverflowuid }
|
|
func OverflowGid() int { sysctlOnce.Do(mustReadSysctl); return kernelOverflowgid }
|
|
func LastCap() uintptr { sysctlOnce.Do(mustReadSysctl); return uintptr(kernelCapLastCap) }
|