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Always copy PHP and legacy CLI files if they have changed
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,79 @@ | ||
| package file | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "crypto/sha256" | ||
| "encoding/hex" | ||
| "io" | ||
| "os" | ||
| ) | ||
|
|
||
| // CopyIfChanged copies source data to a destination filename if it has changed. | ||
| // It is considered changed if its length or contents are different. | ||
| func CopyIfChanged(destFilename string, source []byte, perm os.FileMode) error { | ||
| matches, err := compare(destFilename, source) | ||
| if (err != nil && !os.IsNotExist(err)) || matches { | ||
| return err | ||
| } | ||
| return os.WriteFile(destFilename, source, perm) | ||
| } | ||
|
|
||
| // compare checks if a file matches the given source. | ||
| func compare(filename string, data []byte) (bool, error) { | ||
| f, err := os.Open(filename) | ||
| if err != nil { | ||
| return false, err | ||
| } | ||
| defer f.Close() | ||
|
|
||
| fi, err := f.Stat() | ||
| if err != nil { | ||
| return false, err | ||
| } | ||
| if fi.Size() != int64(len(data)) { | ||
| return false, nil | ||
| } | ||
|
|
||
| var ( | ||
| buf = make([]byte, 32*1024) | ||
| offset = 0 | ||
| ) | ||
| for { | ||
| n, err := f.Read(buf) | ||
| if err != nil { | ||
| if err == io.EOF { | ||
| break | ||
| } | ||
| return false, err | ||
| } | ||
| if offset+n > len(data) || !bytes.Equal(data[offset:offset+n], buf[:n]) { | ||
| return false, nil | ||
| } | ||
| offset += n | ||
| } | ||
|
|
||
| return offset == len(data), nil | ||
| } | ||
|
|
||
| // CheckHash checks if a file has the given SHA256 hash. | ||
| func CheckHash(filename, hash string) (bool, error) { | ||
| fh, err := sha256File(filename) | ||
| if err != nil { | ||
| return false, err | ||
| } | ||
| return fh == hash, nil | ||
| } | ||
|
|
||
| // sha256File calculates the SHA256 hash of a file. | ||
| func sha256File(filename string) (string, error) { | ||
| f, err := os.Open(filename) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
| defer f.Close() | ||
| h := sha256.New() | ||
| if _, err := io.Copy(h, f); err != nil { | ||
| return "", err | ||
| } | ||
| return hex.EncodeToString(h.Sum(nil)), nil | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,63 @@ | ||
| package file | ||
|
|
||
| import ( | ||
| "os" | ||
| "path/filepath" | ||
| "testing" | ||
| "time" | ||
|
|
||
| "github.com/stretchr/testify/assert" | ||
| "github.com/stretchr/testify/require" | ||
| ) | ||
|
|
||
| func TestCopyIfChanged(t *testing.T) { | ||
| cases := []struct { | ||
| name string | ||
| initialData []byte | ||
| sourceData []byte | ||
| expectWrite bool | ||
| }{ | ||
| {"File does not exist", nil, []byte("new data"), true}, | ||
| {"File matches source", []byte("same data"), []byte("same data"), false}, | ||
| {"File content differs", []byte("old data"), []byte("new data"), true}, | ||
| {"File size differs", []byte("short"), []byte("much longer data"), true}, | ||
| {"Empty source", []byte("existing data"), []byte{}, true}, | ||
| } | ||
|
|
||
| tmpDir := t.TempDir() | ||
| for _, c := range cases { | ||
| t.Run(c.name, func(t *testing.T) { | ||
| destFile := filepath.Join(tmpDir, "testfile") | ||
|
|
||
| if c.initialData != nil { | ||
| require.NoError(t, os.WriteFile(destFile, c.initialData, 0o600)) | ||
| time.Sleep(time.Millisecond * 5) | ||
| } | ||
|
|
||
| var modTimeBeforeCopy time.Time | ||
| stat, err := os.Stat(destFile) | ||
| if c.initialData == nil { | ||
| require.True(t, os.IsNotExist(err)) | ||
| } else { | ||
| require.NoError(t, err) | ||
| modTimeBeforeCopy = stat.ModTime() | ||
| } | ||
|
|
||
| err = CopyIfChanged(destFile, c.sourceData, 0o600) | ||
| require.NoError(t, err) | ||
|
|
||
| statAfterCopy, err := os.Stat(destFile) | ||
| require.NoError(t, err) | ||
| if c.expectWrite { | ||
| assert.Greater(t, statAfterCopy.ModTime().Truncate(time.Millisecond), modTimeBeforeCopy.Truncate(time.Millisecond)) | ||
| } else { | ||
| assert.Equal(t, modTimeBeforeCopy.Truncate(time.Millisecond), statAfterCopy.ModTime().Truncate(time.Millisecond)) | ||
| } | ||
|
|
||
| data, err := os.ReadFile(destFile) | ||
| require.NoError(t, err) | ||
|
|
||
| assert.Equal(t, data, c.sourceData) | ||
| }) | ||
| } | ||
| } |
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