Ophestra
1b5ecd9eaf
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This allows slightly easier use of the vanity url. This also provides some disambiguation between low level containers and hakurei app containers. Signed-off-by: Ophestra <cat@gensokyo.uk>
48 lines
1.5 KiB
Go
48 lines
1.5 KiB
Go
package container
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import (
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"bytes"
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"log"
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"os"
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"strconv"
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"sync"
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)
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var (
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kernelOverflowuid int
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kernelOverflowgid int
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kernelCapLastCap int
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sysctlOnce sync.Once
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)
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const (
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kernelOverflowuidPath = "/proc/sys/kernel/overflowuid"
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kernelOverflowgidPath = "/proc/sys/kernel/overflowgid"
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kernelCapLastCapPath = "/proc/sys/kernel/cap_last_cap"
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)
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func mustReadSysctl() {
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if v, err := os.ReadFile(kernelOverflowuidPath); err != nil {
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log.Fatalf("cannot read %q: %v", kernelOverflowuidPath, err)
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} else if kernelOverflowuid, err = strconv.Atoi(string(bytes.TrimSpace(v))); err != nil {
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log.Fatalf("cannot interpret %q: %v", kernelOverflowuidPath, err)
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}
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if v, err := os.ReadFile(kernelOverflowgidPath); err != nil {
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log.Fatalf("cannot read %q: %v", kernelOverflowgidPath, err)
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} else if kernelOverflowgid, err = strconv.Atoi(string(bytes.TrimSpace(v))); err != nil {
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log.Fatalf("cannot interpret %q: %v", kernelOverflowgidPath, err)
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}
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if v, err := os.ReadFile(kernelCapLastCapPath); err != nil {
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log.Fatalf("cannot read %q: %v", kernelCapLastCapPath, err)
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} else if kernelCapLastCap, err = strconv.Atoi(string(bytes.TrimSpace(v))); err != nil {
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log.Fatalf("cannot interpret %q: %v", kernelCapLastCapPath, err)
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}
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}
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func OverflowUid() int { sysctlOnce.Do(mustReadSysctl); return kernelOverflowuid }
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func OverflowGid() int { sysctlOnce.Do(mustReadSysctl); return kernelOverflowgid }
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func LastCap() uintptr { sysctlOnce.Do(mustReadSysctl); return uintptr(kernelCapLastCap) }
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