ab6f0b6358
- remove the need to map host's /dev - remove race issues or need to have a working `udevadm settle`
64 lines
1.4 KiB
Go
64 lines
1.4 KiB
Go
package main
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import (
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"bytes"
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"log"
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"os"
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"path/filepath"
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"strconv"
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"strings"
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"syscall"
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"golang.org/x/sys/unix"
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)
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// Simulate a udev run for our needs
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func syncSysToDev() {
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// loop devices
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sysPaths, _ := filepath.Glob("/sys/devices/virtual/block/loop*/**/dev")
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for _, sysPath := range sysPaths {
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mknodBlk(sysPath)
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}
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}
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func mknodBlk(sysPath string) {
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devPath := "/dev/" + filepath.Base(filepath.Dir(sysPath))
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if _, err := os.Stat(devPath); os.IsNotExist(err) {
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// ok
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} else if err != nil {
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log.Printf("stat %s failed: %v", devPath, err)
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return
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} else {
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return // exists
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}
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devBytes, err := os.ReadFile(sysPath)
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if err != nil {
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log.Printf("read %s failed: %v", sysPath, err)
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return
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}
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devBytes = bytes.TrimSpace(devBytes)
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// rust: let Some(dev) = devBytes.split_once(':').filter_map(|a,b| Some(mkdev(a.parse().ok()?, b.parse().ok()?)));
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majorStr, minorStr, ok := strings.Cut(string(devBytes), ":")
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if !ok {
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log.Printf("%s: invalid dev string: %s", sysPath, string(devBytes))
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return
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}
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major, err := strconv.ParseUint(majorStr, 10, 32)
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if err != nil {
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log.Printf("%s: invalid major: %q", sysPath, majorStr)
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return
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}
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minor, err := strconv.ParseUint(minorStr, 10, 32)
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if err != nil {
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log.Printf("%s: invalid minor: %q", sysPath, minorStr)
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return
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}
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devMajMin := int(unix.Mkdev(uint32(major), uint32(minor)))
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log.Printf("mknod %s b %d %d", devPath, major, minor)
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unix.Mknod(devPath, syscall.S_IFBLK|0o0600, devMajMin)
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}
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