forked from TrueCloudLab/restic
c23c0f7c14
Fixes #3687. Uses the cast suggested by @MichaelEischer, except that the contant isn't cast along, because it's untyped and will be converted by the compiler as necessary.
71 lines
1.5 KiB
Go
71 lines
1.5 KiB
Go
package fs
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import (
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"io"
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"io/ioutil"
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"os"
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"testing"
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"time"
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rtest "github.com/restic/restic/internal/test"
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"golang.org/x/sys/unix"
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)
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func TestNoatime(t *testing.T) {
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f, err := ioutil.TempFile("", "restic-test-noatime")
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if err != nil {
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t.Fatal(err)
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}
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defer func() {
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_ = f.Close()
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err = Remove(f.Name())
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if err != nil {
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t.Fatal(err)
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}
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}()
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// Only run this test on common filesystems that support O_NOATIME.
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// On others, we may not get an error.
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if !supportsNoatime(t, f) {
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t.Skip("temp directory may not support O_NOATIME, skipping")
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}
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// From this point on, we own the file, so we should not get EPERM.
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_, err = io.WriteString(f, "Hello!")
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rtest.OK(t, err)
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_, err = f.Seek(0, io.SeekStart)
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rtest.OK(t, err)
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getAtime := func() time.Time {
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info, err := f.Stat()
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rtest.OK(t, err)
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return ExtendedStat(info).AccessTime
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}
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atime := getAtime()
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err = setFlags(f)
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rtest.OK(t, err)
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_, err = f.Read(make([]byte, 1))
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rtest.OK(t, err)
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rtest.Equals(t, atime, getAtime())
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}
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func supportsNoatime(t *testing.T, f *os.File) bool {
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var fsinfo unix.Statfs_t
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err := unix.Fstatfs(int(f.Fd()), &fsinfo)
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rtest.OK(t, err)
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// The funky cast works around a compiler error on 32-bit archs:
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// "unix.BTRFS_SUPER_MAGIC (untyped int constant 2435016766) overflows int32".
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// https://github.com/golang/go/issues/52061
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typ := int64(uint(fsinfo.Type))
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return typ == unix.BTRFS_SUPER_MAGIC ||
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typ == unix.EXT2_SUPER_MAGIC ||
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typ == unix.EXT3_SUPER_MAGIC ||
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typ == unix.EXT4_SUPER_MAGIC ||
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typ == unix.TMPFS_MAGIC
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}
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