113 lines
2.6 KiB
Go
113 lines
2.6 KiB
Go
package osutil
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import (
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"fmt"
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"log"
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"os"
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"path/filepath"
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"strings"
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"golang.org/x/sys/unix"
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)
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// Try to guess whether the system has merged dirs under /usr
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func HasMergedUsr() bool {
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for _, dir := range []string{"/bin", "/lib"} {
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stat, err := os.Lstat(dir)
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if err != nil {
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// TODO: probably because the dir doesn't exist... so
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// should we assume that it's because the system has some weird
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// implementation of "merge /usr"?
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return true
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} else if stat.Mode()&os.ModeSymlink == 0 {
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// Not a symlink, so must not be merged /usr
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return false
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}
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}
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return true
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}
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// Converts given path to one supported by a merged /usr config.
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// E.g., /bin/foo becomes /usr/bin/foo, /lib/bar becomes /usr/lib/bar
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// See: https://www.freedesktop.org/wiki/Software/systemd/TheCaseForTheUsrMerge
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func MergeUsr(file string) string {
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// Prepend /usr to supported paths
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for _, prefix := range []string{"/bin", "/sbin", "/lib", "/lib64"} {
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if strings.HasPrefix(file, prefix) {
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file = filepath.Join("/usr", file)
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break
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}
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}
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// Convert /usr/sbin --> /usr/bin
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if part, found := strings.CutPrefix(file, "/usr/sbin"); found {
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file = filepath.Join("/usr/bin/", part)
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}
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return file
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}
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// Converts a relative symlink target path (e.g. ../../lib/foo.so), that is
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// absolute path
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func RelativeSymlinkTargetToDir(symPath string, dir string) (string, error) {
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var path string
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oldWd, err := os.Getwd()
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if err != nil {
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log.Print("Unable to get current working dir")
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return path, err
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}
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if err := os.Chdir(dir); err != nil {
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log.Print("Unable to change to working dir: ", dir)
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return path, err
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}
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path, err = filepath.Abs(symPath)
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if err != nil {
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log.Print("Unable to resolve abs path to: ", symPath)
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return path, err
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}
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if err := os.Chdir(oldWd); err != nil {
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log.Print("Unable to change to old working dir")
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return path, err
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}
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return path, nil
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}
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func FreeSpace(path string) (uint64, error) {
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var stat unix.Statfs_t
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unix.Statfs(path, &stat)
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size := stat.Bavail * uint64(stat.Bsize)
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return size, nil
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}
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func getKernelReleaseFile() (string, error) {
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files, _ := filepath.Glob("/usr/share/kernel/*/kernel.release")
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// only one kernel flavor supported
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if len(files) != 1 {
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return "", fmt.Errorf("only one kernel release/flavor is supported, found: %q", files)
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}
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return files[0], nil
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}
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func GetKernelVersion() (string, error) {
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var version string
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releaseFile, err := getKernelReleaseFile()
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if err != nil {
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return version, err
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}
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contents, err := os.ReadFile(releaseFile)
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if err != nil {
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return version, err
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}
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return strings.TrimSpace(string(contents)), nil
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}
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