74 lines
1.8 KiB
Go
74 lines
1.8 KiB
Go
// +build !windows
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// Package kernel provides helper function to get, parse and compare kernel
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// versions for different platforms.
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package kernel
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import (
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"errors"
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"fmt"
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)
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// VersionInfo holds information about the kernel.
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type VersionInfo struct {
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Kernel int // Version of the kernel (e.g. 4.1.2-generic -> 4)
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Major int // Major part of the kernel version (e.g. 4.1.2-generic -> 1)
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Minor int // Minor part of the kernel version (e.g. 4.1.2-generic -> 2)
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Flavor string // Flavor of the kernel version (e.g. 4.1.2-generic -> generic)
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}
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func (k *VersionInfo) String() string {
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return fmt.Sprintf("%d.%d.%d%s", k.Kernel, k.Major, k.Minor, k.Flavor)
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}
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// CompareKernelVersion compares two kernel.VersionInfo structs.
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// Returns -1 if a < b, 0 if a == b, 1 it a > b
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func CompareKernelVersion(a, b VersionInfo) int {
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if a.Kernel < b.Kernel {
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return -1
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} else if a.Kernel > b.Kernel {
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return 1
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}
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if a.Major < b.Major {
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return -1
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} else if a.Major > b.Major {
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return 1
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}
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if a.Minor < b.Minor {
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return -1
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} else if a.Minor > b.Minor {
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return 1
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}
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return 0
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}
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// ParseRelease parses a string and creates a VersionInfo based on it.
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func ParseRelease(release string) (*VersionInfo, error) {
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var (
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kernel, major, minor, parsed int
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flavor, partial string
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)
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// Ignore error from Sscanf to allow an empty flavor. Instead, just
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// make sure we got all the version numbers.
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parsed, _ = fmt.Sscanf(release, "%d.%d%s", &kernel, &major, &partial)
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if parsed < 2 {
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return nil, errors.New("Can't parse kernel version " + release)
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}
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// sometimes we have 3.12.25-gentoo, but sometimes we just have 3.12-1-amd64
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parsed, _ = fmt.Sscanf(partial, ".%d%s", &minor, &flavor)
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if parsed < 1 {
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flavor = partial
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}
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return &VersionInfo{
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Kernel: kernel,
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Major: major,
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Minor: minor,
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Flavor: flavor,
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}, nil
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}
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