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| 1 | +// Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved. |
| 2 | + |
| 3 | +package oci_tool |
| 4 | + |
| 5 | +import ( |
| 6 | + "bufio" |
| 7 | + "fmt" |
| 8 | + "io" |
| 9 | + "io/ioutil" |
| 10 | + "os" |
| 11 | + "path" |
| 12 | + "path/filepath" |
| 13 | +) |
| 14 | + |
| 15 | +// Individual file io strategies for different operations |
| 16 | +type FileAction func(string, string) error |
| 17 | + |
| 18 | +// Traverse a directory, executing the supplied FileAction on each file |
| 19 | +func ProcessDirectory(targetDir string, backupDir string, fileActionFn FileAction, targetExtns ...string) (err error) { |
| 20 | + |
| 21 | + _, err = os.Stat(targetDir) |
| 22 | + |
| 23 | + if err != nil { |
| 24 | + return fmt.Errorf("Error reading directory\n %s", err) |
| 25 | + } |
| 26 | + |
| 27 | + files, err := ioutil.ReadDir(targetDir) |
| 28 | + |
| 29 | + if err != nil { |
| 30 | + fmt.Errorf("Error reading directory contents \n %s", err) |
| 31 | + } |
| 32 | + |
| 33 | + for _, res := range files { |
| 34 | + targetRes := path.Join(targetDir, res.Name()) |
| 35 | + backupRes := path.Join(backupDir, res.Name()) |
| 36 | + |
| 37 | + if res.IsDir() { |
| 38 | + err = ProcessDirectory(targetRes, backupRes, fileActionFn, targetExtns...) |
| 39 | + |
| 40 | + if err != nil { |
| 41 | + return err |
| 42 | + } |
| 43 | + } else { |
| 44 | + if len(targetExtns) == 0 { |
| 45 | + err = fileActionFn(targetRes, backupRes) |
| 46 | + |
| 47 | + if err != nil { |
| 48 | + return err |
| 49 | + } |
| 50 | + } else { |
| 51 | + if contains(targetExtns, filepath.Ext(res.Name())) { |
| 52 | + err = fileActionFn(targetRes, backupRes) |
| 53 | + |
| 54 | + if err != nil { |
| 55 | + return err |
| 56 | + } |
| 57 | + } else { |
| 58 | + fmt.Println("Skipping: ", targetDir) |
| 59 | + } |
| 60 | + } |
| 61 | + } |
| 62 | + } |
| 63 | + |
| 64 | + return |
| 65 | +} |
| 66 | + |
| 67 | +// Copy file from targetFile path to backupFile path |
| 68 | +func CopyFile(targetFile string, backupFile string) (err error) { |
| 69 | + |
| 70 | + // make sure directory structure exists |
| 71 | + bkDir := path.Dir(backupFile) |
| 72 | + _, err = os.Stat(bkDir) |
| 73 | + |
| 74 | + if err != nil { |
| 75 | + if os.IsNotExist(err) { |
| 76 | + oDir := path.Dir(targetFile) |
| 77 | + fi, err := os.Stat(oDir) |
| 78 | + |
| 79 | + if err != nil { |
| 80 | + return fmt.Errorf("Error reading original directory %s", err) |
| 81 | + } |
| 82 | + |
| 83 | + err = os.MkdirAll(bkDir, fi.Mode()) |
| 84 | + |
| 85 | + if err != nil { |
| 86 | + return fmt.Errorf("Error creating directory for file %s", err) |
| 87 | + } |
| 88 | + } else { |
| 89 | + return fmt.Errorf("Unexpected error reading original directory %s", err) |
| 90 | + } |
| 91 | + } |
| 92 | + |
| 93 | + src, err := os.Open(targetFile) |
| 94 | + |
| 95 | + if err != nil { |
| 96 | + return fmt.Errorf("Error reading original file\n %s", err) |
| 97 | + } |
| 98 | + |
| 99 | + defer src.Close() |
| 100 | + |
| 101 | + dst, err := os.Create(backupFile) |
| 102 | + |
| 103 | + if err != nil { |
| 104 | + return fmt.Errorf("Error creating backup file\n %s", err) |
| 105 | + } |
| 106 | + |
| 107 | + defer dst.Close() |
| 108 | + |
| 109 | + fmt.Printf("Copying %s --> %s", targetFile, backupFile) |
| 110 | + size, err := io.Copy(dst, src) |
| 111 | + |
| 112 | + if err != nil { |
| 113 | + return fmt.Errorf("Error writing file\n %s", err) |
| 114 | + } |
| 115 | + |
| 116 | + fmt.Printf(", %d bytes\n", size) |
| 117 | + return |
| 118 | +} |
| 119 | + |
| 120 | +// Read file from backup location, apply transforms and overwrite original file |
| 121 | +func MigratePlanFile(targetFile string, backupFile string) (err error) { |
| 122 | + src, err := os.Open(backupFile) |
| 123 | + |
| 124 | + if err != nil { |
| 125 | + return fmt.Errorf("Error reading file\n %s", err) |
| 126 | + } |
| 127 | + |
| 128 | + defer src.Close() |
| 129 | + |
| 130 | + dst, err := os.Create(targetFile) |
| 131 | + |
| 132 | + if err != nil { |
| 133 | + return fmt.Errorf("Error creating write location\n %s", err) |
| 134 | + } |
| 135 | + |
| 136 | + defer dst.Close() |
| 137 | + |
| 138 | + wrtr := bufio.NewWriter(dst) |
| 139 | + |
| 140 | + var replaceStrategy func(string) string |
| 141 | + if filepath.Ext(backupFile) == ".tf" { |
| 142 | + replaceStrategy = replaceTemplateTokens |
| 143 | + } else { |
| 144 | + replaceStrategy = replaceStatefileTokens |
| 145 | + } |
| 146 | + |
| 147 | + scanner := bufio.NewScanner(src) |
| 148 | + for scanner.Scan() { |
| 149 | + str := scanner.Text() |
| 150 | + str = replaceStrategy(str) |
| 151 | + fmt.Fprintln(wrtr, str) |
| 152 | + } |
| 153 | + wrtr.Flush() |
| 154 | + |
| 155 | + return |
| 156 | +} |
| 157 | + |
| 158 | +// Scan TF files for provider blocks and inject a region value if not specified |
| 159 | +func AddRegionToProvider(targetFile string, backupFile string) error { |
| 160 | + fmt.Printf("Scanning %s\n", targetFile) |
| 161 | + |
| 162 | + fileInfo, err := os.Stat(targetFile) |
| 163 | + |
| 164 | + const maxSize = 1024 * 1024 |
| 165 | + if fileInfo.Size() > maxSize { |
| 166 | + return fmt.Errorf("File too large to process") |
| 167 | + } |
| 168 | + |
| 169 | + fileBytes, err := ioutil.ReadFile(targetFile) |
| 170 | + str, err := scanAndUpdateProvider(string(fileBytes)) |
| 171 | + |
| 172 | + if err != nil { |
| 173 | + return fmt.Errorf("Error updating provider block\n %s", err) |
| 174 | + } |
| 175 | + |
| 176 | + ioutil.WriteFile(targetFile, []byte(str), fileInfo.Mode()) |
| 177 | + |
| 178 | + return err |
| 179 | +} |
| 180 | + |
| 181 | +// find a string in a slice of strings |
| 182 | +func contains(items []string, target string) bool { |
| 183 | + for _, item := range items { |
| 184 | + if item == target { |
| 185 | + return true |
| 186 | + } |
| 187 | + } |
| 188 | + return false |
| 189 | +} |
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