72 lines
1.8 KiB
Go
72 lines
1.8 KiB
Go
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package main
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import (
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"fmt"
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"golang.org/x/sys/unix"
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)
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// Running as PID 1 there is nothing underneath us: sysfs and devtmpfs are what
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// every check, counter and device node below is reached through, and no one
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// else is going to mount them. Written as checks like everything else, so this
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// is a silent no-op under a running system.
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type mountSpec struct {
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dir string
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fstype string
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magic int64
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flags uintptr
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}
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var wantMounts = []mountSpec{
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{"/proc", "proc", unix.PROC_SUPER_MAGIC, unix.MS_NOSUID | unix.MS_NODEV | unix.MS_NOEXEC},
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{"/sys", "sysfs", unix.SYSFS_MAGIC, unix.MS_NOSUID | unix.MS_NODEV | unix.MS_NOEXEC},
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// devtmpfs reports itself as tmpfs, so an existing tmpfs on /dev is taken
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// as good enough; the kernel populates the nodes either way.
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{"/dev", "devtmpfs", unix.TMPFS_MAGIC, unix.MS_NOSUID},
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}
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func checkMount(m mountSpec) checkResult {
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res := checkResult{item: "mount " + m.dir}
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var st unix.Statfs_t
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err := unix.Statfs(m.dir, &st)
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if err == unix.ENOENT {
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if err := unix.Mkdir(m.dir, 0o755); err != nil {
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res.err = fmt.Errorf("creating %s: %w", m.dir, err)
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res.fatal = true
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return res
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}
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err = unix.Statfs(m.dir, &st)
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}
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if err != nil {
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res.err = err
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res.fatal = true
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return res
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}
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if int64(st.Type) == m.magic {
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res.state = m.fstype + " already mounted"
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return res
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}
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if err := unix.Mount(m.fstype, m.dir, m.fstype, m.flags, ""); err != nil {
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res.err = err
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res.fatal = true
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return res
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}
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res.fixed = true
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res.state = "mounted " + m.fstype
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return res
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}
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// Each mount is what the next check stands on, so the first failure ends it.
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func mountFilesystems() []checkResult {
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var out []checkResult
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for _, m := range wantMounts {
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res := checkMount(m)
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out = append(out, res)
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if res.fatal {
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return out
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}
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}
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return out
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}
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