diff --git a/go.mod b/go.mod index 59c6df10912..bcf73f21544 100644 --- a/go.mod +++ b/go.mod @@ -10,7 +10,7 @@ require ( github.com/cyphar/filepath-securejoin v0.2.3 github.com/docker/go-units v0.4.0 github.com/godbus/dbus/v5 v5.0.6 - github.com/moby/sys/mountinfo v0.5.0 + github.com/moby/sys/mountinfo v0.6.1 github.com/mrunalp/fileutils v0.5.0 github.com/opencontainers/runtime-spec v1.0.3-0.20210326190908-1c3f411f0417 github.com/opencontainers/selinux v1.10.0 diff --git a/go.sum b/go.sum index 9018c6fbd2c..aced7558f69 100644 --- a/go.sum +++ b/go.sum @@ -29,8 +29,8 @@ github.com/kr/pretty v0.2.1/go.mod h1:ipq/a2n7PKx3OHsz4KJII5eveXtPO4qwEXGdVfWzfn github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ= github.com/kr/text v0.1.0 h1:45sCR5RtlFHMR4UwH9sdQ5TC8v0qDQCHnXt+kaKSTVE= github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI= -github.com/moby/sys/mountinfo v0.5.0 h1:2Ks8/r6lopsxWi9m58nlwjaeSzUX9iiL1vj5qB/9ObI= -github.com/moby/sys/mountinfo v0.5.0/go.mod h1:3bMD3Rg+zkqx8MRYPi7Pyb0Ie97QEBmdxbhnCLlSvSU= +github.com/moby/sys/mountinfo v0.6.1 h1:+H/KnGEAGRpTrEAqNVQ2AM3SiwMgJUt/TXj+Z8cmCIc= +github.com/moby/sys/mountinfo v0.6.1/go.mod h1:3bMD3Rg+zkqx8MRYPi7Pyb0Ie97QEBmdxbhnCLlSvSU= github.com/mrunalp/fileutils v0.5.0 h1:NKzVxiH7eSk+OQ4M+ZYW1K6h27RUV3MI6NUTsHhU6Z4= github.com/mrunalp/fileutils v0.5.0/go.mod h1:M1WthSahJixYnrXQl/DFQuteStB1weuxD2QJNHXfbSQ= github.com/opencontainers/runtime-spec v1.0.3-0.20210326190908-1c3f411f0417 h1:3snG66yBm59tKhhSPQrQ/0bCrv1LQbKt40LnUPiUxdc= diff --git a/vendor/github.com/moby/sys/mountinfo/mounted_linux.go b/vendor/github.com/moby/sys/mountinfo/mounted_linux.go index 5c9e3e30e66..bf221e687f1 100644 --- a/vendor/github.com/moby/sys/mountinfo/mounted_linux.go +++ b/vendor/github.com/moby/sys/mountinfo/mounted_linux.go @@ -7,6 +7,34 @@ import ( "golang.org/x/sys/unix" ) +// MountedFast is a method of detecting a mount point without reading +// mountinfo from procfs. A caller can only trust the result if no error +// and sure == true are returned. Otherwise, other methods (e.g. parsing +// /proc/mounts) have to be used. If unsure, use Mounted instead (which +// uses MountedFast, but falls back to parsing mountinfo if needed). +// +// If a non-existent path is specified, an appropriate error is returned. +// In case the caller is not interested in this particular error, it should +// be handled separately using e.g. errors.Is(err, os.ErrNotExist). +// +// This function is only available on Linux. When available (since kernel +// v5.6), openat2(2) syscall is used to reliably detect all mounts. Otherwise, +// the implementation falls back to using stat(2), which can reliably detect +// normal (but not bind) mounts. +func MountedFast(path string) (mounted, sure bool, err error) { + // Root is always mounted. + if path == string(os.PathSeparator) { + return true, true, nil + } + + path, err = normalizePath(path) + if err != nil { + return false, false, err + } + mounted, sure, err = mountedFast(path) + return +} + // mountedByOpenat2 is a method of detecting a mount that works for all kinds // of mounts (incl. bind mounts), but requires a recent (v5.6+) linux kernel. func mountedByOpenat2(path string) (bool, error) { @@ -34,24 +62,40 @@ func mountedByOpenat2(path string) (bool, error) { return false, &os.PathError{Op: "openat2", Path: path, Err: err} } -func mounted(path string) (bool, error) { - path, err := normalizePath(path) - if err != nil { - return false, err +// mountedFast is similar to MountedFast, except it expects a normalized path. +func mountedFast(path string) (mounted, sure bool, err error) { + // Root is always mounted. + if path == string(os.PathSeparator) { + return true, true, nil } + // Try a fast path, using openat2() with RESOLVE_NO_XDEV. - mounted, err := mountedByOpenat2(path) + mounted, err = mountedByOpenat2(path) if err == nil { - return mounted, nil + return mounted, true, nil } + // Another fast path: compare st.st_dev fields. mounted, err = mountedByStat(path) // This does not work for bind mounts, so false negative // is possible, therefore only trust if return is true. if mounted && err == nil { + return true, true, nil + } + + return +} + +func mounted(path string) (bool, error) { + path, err := normalizePath(path) + if err != nil { + return false, err + } + mounted, sure, err := mountedFast(path) + if sure && err == nil { return mounted, nil } - // Fallback to parsing mountinfo + // Fallback to parsing mountinfo. return mountedByMountinfo(path) } diff --git a/vendor/github.com/moby/sys/mountinfo/mounted_unix.go b/vendor/github.com/moby/sys/mountinfo/mounted_unix.go index 45ddad236f3..242f82cc72a 100644 --- a/vendor/github.com/moby/sys/mountinfo/mounted_unix.go +++ b/vendor/github.com/moby/sys/mountinfo/mounted_unix.go @@ -4,7 +4,6 @@ package mountinfo import ( - "fmt" "os" "path/filepath" @@ -33,13 +32,13 @@ func mountedByStat(path string) (bool, error) { func normalizePath(path string) (realPath string, err error) { if realPath, err = filepath.Abs(path); err != nil { - return "", fmt.Errorf("unable to get absolute path for %q: %w", path, err) + return "", err } if realPath, err = filepath.EvalSymlinks(realPath); err != nil { - return "", fmt.Errorf("failed to canonicalise path for %q: %w", path, err) + return "", err } if _, err := os.Stat(realPath); err != nil { - return "", fmt.Errorf("failed to stat target of %q: %w", path, err) + return "", err } return realPath, nil } diff --git a/vendor/github.com/moby/sys/mountinfo/mountinfo.go b/vendor/github.com/moby/sys/mountinfo/mountinfo.go index 9867a66dd85..c7e5cb42aca 100644 --- a/vendor/github.com/moby/sys/mountinfo/mountinfo.go +++ b/vendor/github.com/moby/sys/mountinfo/mountinfo.go @@ -13,9 +13,9 @@ func GetMounts(f FilterFunc) ([]*Info, error) { // Mounted determines if a specified path is a mount point. In case of any // error, false (and an error) is returned. // -// The non-existent path returns an error. If a caller is not interested -// in this particular error, it should handle it separately using e.g. -// errors.Is(err, os.ErrNotExist). +// If a non-existent path is specified, an appropriate error is returned. +// In case the caller is not interested in this particular error, it should +// be handled separately using e.g. errors.Is(err, os.ErrNotExist). func Mounted(path string) (bool, error) { // root is always mounted if path == string(os.PathSeparator) { diff --git a/vendor/modules.txt b/vendor/modules.txt index ce2cb8ac820..2f3959a25f1 100644 --- a/vendor/modules.txt +++ b/vendor/modules.txt @@ -28,7 +28,7 @@ github.com/docker/go-units # github.com/godbus/dbus/v5 v5.0.6 ## explicit github.com/godbus/dbus/v5 -# github.com/moby/sys/mountinfo v0.5.0 +# github.com/moby/sys/mountinfo v0.6.1 ## explicit github.com/moby/sys/mountinfo # github.com/mrunalp/fileutils v0.5.0