1 | /* vi: set sw=4 ts=4:
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2 | *
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3 | * Apply a "universal" diff.
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4 | * Adapted from toybox's patch implementation.
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5 | *
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6 | * Copyright 2007 Rob Landley <rob@landley.net>
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7 | *
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8 | * see http://www.opengroup.org/onlinepubs/009695399/utilities/patch.html
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9 | * (But only does -u, because who still cares about "ed"?)
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10 | *
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11 | * TODO:
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12 | * -b backup
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13 | * -l treat all whitespace as a single space
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14 | * -d chdir first
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15 | * -D define wrap #ifdef and #ifndef around changes
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16 | * -o outfile output here instead of in place
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17 | * -r rejectfile write rejected hunks to this file
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18 | * --dry-run (regression!)
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19 | *
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20 | * -f force (no questions asked)
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21 | * -F fuzz (number, default 2)
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22 | * [file] which file to patch
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23 | */
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24 |
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25 | //config:config PATCH
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26 | //config: bool "patch"
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27 | //config: default y
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28 | //config: help
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29 | //config: Apply a unified diff formatted patch.
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30 |
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31 | //applet:IF_PATCH(APPLET(patch, BB_DIR_USR_BIN, BB_SUID_DROP))
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32 |
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33 | //kbuild:lib-$(CONFIG_PATCH) += patch.o
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34 |
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35 | //usage:#define patch_trivial_usage
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36 | //usage: "[OPTIONS] [ORIGFILE [PATCHFILE]]"
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37 | //usage:#define patch_full_usage "\n\n"
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38 | //usage: IF_LONG_OPTS(
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39 | //usage: " -p,--strip N Strip N leading components from file names"
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40 | //usage: "\n -i,--input DIFF Read DIFF instead of stdin"
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41 | //usage: "\n -R,--reverse Reverse patch"
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42 | //usage: "\n -N,--forward Ignore already applied patches"
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43 | /*usage: "\n --dry-run Don't actually change files" - TODO */
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44 | //usage: "\n -E,--remove-empty-files Remove output files if they become empty"
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45 | //usage: )
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46 | //usage: IF_NOT_LONG_OPTS(
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47 | //usage: " -p N Strip N leading components from file names"
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48 | //usage: "\n -i DIFF Read DIFF instead of stdin"
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49 | //usage: "\n -R Reverse patch"
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50 | //usage: "\n -N Ignore already applied patches"
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51 | //usage: "\n -E Remove output files if they become empty"
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52 | //usage: )
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53 | /* -u "interpret as unified diff" is supported but not documented: this info is not useful for --help */
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54 | /* -x "debug" is supported but does nothing */
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55 | //usage:
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56 | //usage:#define patch_example_usage
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57 | //usage: "$ patch -p1 < example.diff\n"
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58 | //usage: "$ patch -p0 -i example.diff"
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59 |
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60 | #include "libbb.h"
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61 |
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62 |
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63 | // libbb candidate?
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64 |
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65 | struct double_list {
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66 | struct double_list *next;
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67 | struct double_list *prev;
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68 | char *data;
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69 | };
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70 |
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71 | // Free all the elements of a linked list
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72 | // Call freeit() on each element before freeing it.
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73 | static void dlist_free(struct double_list *list, void (*freeit)(void *data))
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74 | {
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75 | while (list) {
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76 | void *pop = list;
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77 | list = list->next;
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78 | freeit(pop);
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79 | // Bail out also if list is circular.
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80 | if (list == pop) break;
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81 | }
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82 | }
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83 |
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84 | // Add an entry before "list" element in (circular) doubly linked list
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85 | static struct double_list *dlist_add(struct double_list **list, char *data)
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86 | {
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87 | struct double_list *llist;
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88 | struct double_list *line = xmalloc(sizeof(*line));
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89 |
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90 | line->data = data;
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91 | llist = *list;
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92 | if (llist) {
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93 | struct double_list *p;
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94 | line->next = llist;
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95 | p = line->prev = llist->prev;
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96 | // (list is circular, we assume p is never NULL)
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97 | p->next = line;
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98 | llist->prev = line;
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99 | } else
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100 | *list = line->next = line->prev = line;
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101 |
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102 | return line;
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103 | }
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104 |
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105 |
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106 | struct globals {
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107 | char *infile;
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108 | long prefix;
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109 |
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110 | struct double_list *current_hunk;
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111 |
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112 | long oldline, oldlen, newline, newlen;
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113 | long linenum;
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114 | int context, state, hunknum;
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115 | int filein, fileout;
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116 | char *tempname;
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117 |
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118 | int exitval;
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119 | };
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120 | #define TT (*ptr_to_globals)
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121 | #define INIT_TT() do { \
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122 | SET_PTR_TO_GLOBALS(xzalloc(sizeof(TT))); \
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123 | } while (0)
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124 |
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125 |
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126 | #define FLAG_STR "Rup:i:NEx"
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127 | /* FLAG_REVERSE must be == 1! Code uses this fact. */
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128 | #define FLAG_REVERSE (1 << 0)
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129 | #define FLAG_u (1 << 1)
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130 | #define FLAG_PATHLEN (1 << 2)
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131 | #define FLAG_INPUT (1 << 3)
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132 | #define FLAG_IGNORE (1 << 4)
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133 | #define FLAG_RMEMPTY (1 << 5)
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134 | /* Enable this bit and use -x for debug output: */
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135 | #define FLAG_DEBUG (0 << 6)
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136 |
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137 | // Dispose of a line of input, either by writing it out or discarding it.
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138 |
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139 | // state < 2: just free
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140 | // state = 2: write whole line to stderr
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141 | // state = 3: write whole line to fileout
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142 | // state > 3: write line+1 to fileout when *line != state
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143 |
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144 | #define PATCH_DEBUG (option_mask32 & FLAG_DEBUG)
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145 |
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146 | static void do_line(void *data)
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147 | {
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148 | struct double_list *dlist = data;
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149 |
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150 | if (TT.state>1 && *dlist->data != TT.state)
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151 | fdprintf(TT.state == 2 ? 2 : TT.fileout,
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152 | "%s\n", dlist->data+(TT.state>3 ? 1 : 0));
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153 |
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154 | if (PATCH_DEBUG) fdprintf(2, "DO %d: %s\n", TT.state, dlist->data);
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155 |
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156 | free(dlist->data);
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157 | free(dlist);
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158 | }
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159 |
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160 | static void finish_oldfile(void)
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161 | {
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162 | if (TT.tempname) {
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163 | // Copy the rest of the data and replace the original with the copy.
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164 | char *temp;
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165 |
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166 | if (TT.filein != -1) {
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167 | bb_copyfd_eof(TT.filein, TT.fileout);
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168 | xclose(TT.filein);
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169 | }
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170 | xclose(TT.fileout);
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171 |
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172 | temp = xstrdup(TT.tempname);
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173 | temp[strlen(temp) - 6] = '\0';
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174 | rename(TT.tempname, temp);
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175 | free(temp);
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176 |
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177 | free(TT.tempname);
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178 | TT.tempname = NULL;
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179 | }
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180 | TT.fileout = TT.filein = -1;
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181 | }
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182 |
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183 | static void fail_hunk(void)
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184 | {
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185 | if (!TT.current_hunk) return;
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186 |
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187 | fdprintf(2, "Hunk %d FAILED %ld/%ld.\n", TT.hunknum, TT.oldline, TT.newline);
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188 | TT.exitval = 1;
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189 |
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190 | // If we got to this point, we've seeked to the end. Discard changes to
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191 | // this file and advance to next file.
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192 |
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193 | TT.state = 2;
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194 | TT.current_hunk->prev->next = NULL;
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195 | dlist_free(TT.current_hunk, do_line);
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196 | TT.current_hunk = NULL;
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197 |
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198 | // Abort the copy and delete the temporary file.
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199 | close(TT.filein);
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200 | close(TT.fileout);
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201 | unlink(TT.tempname);
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202 | free(TT.tempname);
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203 | TT.tempname = NULL;
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204 |
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205 | TT.state = 0;
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206 | }
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207 |
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208 | // Given a hunk of a unified diff, make the appropriate change to the file.
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209 | // This does not use the location information, but instead treats a hunk
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210 | // as a sort of regex. Copies data from input to output until it finds
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211 | // the change to be made, then outputs the changed data and returns.
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212 | // (Finding EOF first is an error.) This is a single pass operation, so
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213 | // multiple hunks must occur in order in the file.
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214 |
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215 | static int apply_one_hunk(void)
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216 | {
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217 | struct double_list *plist, *buf = NULL, *check;
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218 | int matcheof = 0, reverse = option_mask32 & FLAG_REVERSE, backwarn = 0;
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219 | /* Do we try "dummy" revert to check whether
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220 | * to silently skip this hunk? Used to implement -N.
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221 | */
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222 | int dummy_revert = 0;
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223 |
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224 | // Break doubly linked list so we can use singly linked traversal function.
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225 | TT.current_hunk->prev->next = NULL;
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226 |
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227 | // Match EOF if there aren't as many ending context lines as beginning
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228 | for (plist = TT.current_hunk; plist; plist = plist->next) {
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229 | if (plist->data[0]==' ') matcheof++;
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230 | else matcheof = 0;
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231 | if (PATCH_DEBUG) fdprintf(2, "HUNK:%s\n", plist->data);
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232 | }
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233 | matcheof = !matcheof || matcheof < TT.context;
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234 |
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235 | if (PATCH_DEBUG) fdprintf(2,"MATCHEOF=%c\n", matcheof ? 'Y' : 'N');
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236 |
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237 | // Loop through input data searching for this hunk. Match all context
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238 | // lines and all lines to be removed until we've found the end of a
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239 | // complete hunk.
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240 | plist = TT.current_hunk;
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241 | buf = NULL;
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242 | if (reverse ? TT.oldlen : TT.newlen) for (;;) {
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243 | char *data = xmalloc_reads(TT.filein, NULL);
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244 |
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245 | TT.linenum++;
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246 |
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247 | // Figure out which line of hunk to compare with next. (Skip lines
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248 | // of the hunk we'd be adding.)
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249 | while (plist && *plist->data == "+-"[reverse]) {
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250 | if (data && !strcmp(data, plist->data+1)) {
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251 | if (!backwarn) {
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252 | backwarn = TT.linenum;
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253 | if (option_mask32 & FLAG_IGNORE) {
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254 | dummy_revert = 1;
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255 | reverse ^= 1;
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256 | continue;
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257 | }
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258 | }
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259 | }
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260 | plist = plist->next;
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261 | }
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262 |
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263 | // Is this EOF?
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264 | if (!data) {
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265 | if (PATCH_DEBUG) fdprintf(2, "INEOF\n");
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266 |
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267 | // Does this hunk need to match EOF?
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268 | if (!plist && matcheof) break;
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269 |
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270 | if (backwarn)
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271 | fdprintf(2,"Possibly reversed hunk %d at %ld\n",
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272 | TT.hunknum, TT.linenum);
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273 |
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274 | // File ended before we found a place for this hunk.
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275 | fail_hunk();
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276 | goto done;
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277 | }
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278 |
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279 | if (PATCH_DEBUG) fdprintf(2, "IN: %s\n", data);
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280 | check = dlist_add(&buf, data);
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281 |
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282 | // Compare this line with next expected line of hunk.
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283 | // todo: teach the strcmp() to ignore whitespace.
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284 |
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285 | // A match can fail because the next line doesn't match, or because
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286 | // we hit the end of a hunk that needed EOF, and this isn't EOF.
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287 |
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288 | // If match failed, flush first line of buffered data and
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289 | // recheck buffered data for a new match until we find one or run
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290 | // out of buffer.
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291 |
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292 | for (;;) {
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293 | if (!plist || strcmp(check->data, plist->data+1)) {
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294 | // Match failed. Write out first line of buffered data and
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295 | // recheck remaining buffered data for a new match.
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296 |
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297 | if (PATCH_DEBUG)
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298 | fdprintf(2, "NOT: %s\n", plist->data);
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299 |
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300 | TT.state = 3;
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301 | check = buf;
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302 | buf = buf->next;
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303 | check->prev->next = buf;
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304 | buf->prev = check->prev;
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305 | do_line(check);
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306 | plist = TT.current_hunk;
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307 |
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308 | // If we've reached the end of the buffer without confirming a
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309 | // match, read more lines.
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310 | if (check == buf) {
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311 | buf = NULL;
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312 | break;
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313 | }
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314 | check = buf;
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315 | } else {
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316 | if (PATCH_DEBUG)
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317 | fdprintf(2, "MAYBE: %s\n", plist->data);
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318 | // This line matches. Advance plist, detect successful match.
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319 | plist = plist->next;
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320 | if (!plist && !matcheof) goto out;
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321 | check = check->next;
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322 | if (check == buf) break;
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323 | }
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324 | }
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325 | }
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326 | out:
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327 | // We have a match. Emit changed data.
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328 | TT.state = "-+"[reverse ^ dummy_revert];
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329 | dlist_free(TT.current_hunk, do_line);
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330 | TT.current_hunk = NULL;
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331 | TT.state = 1;
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332 | done:
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333 | if (buf) {
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334 | buf->prev->next = NULL;
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335 | dlist_free(buf, do_line);
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336 | }
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337 |
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338 | return TT.state;
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339 | }
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340 |
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341 | // Read a patch file and find hunks, opening/creating/deleting files.
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342 | // Call apply_one_hunk() on each hunk.
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343 |
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344 | // state 0: Not in a hunk, look for +++.
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345 | // state 1: Found +++ file indicator, look for @@
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346 | // state 2: In hunk: counting initial context lines
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347 | // state 3: In hunk: getting body
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348 |
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349 | int patch_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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350 | int patch_main(int argc UNUSED_PARAM, char **argv)
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351 | {
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352 | int opts;
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353 | int reverse, state = 0;
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354 | char *oldname = NULL, *newname = NULL;
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355 | char *opt_p, *opt_i;
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356 | long oldlen = oldlen; /* for compiler */
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357 | long newlen = newlen; /* for compiler */
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358 |
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359 | INIT_TT();
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360 |
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361 | opts = getopt32(argv, FLAG_STR, &opt_p, &opt_i);
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362 | argv += optind;
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363 | reverse = opts & FLAG_REVERSE;
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364 | TT.prefix = (opts & FLAG_PATHLEN) ? xatoi(opt_p) : 0; // can be negative!
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365 | TT.filein = TT.fileout = -1;
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366 | if (opts & FLAG_INPUT) {
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367 | xmove_fd(xopen_stdin(opt_i), STDIN_FILENO);
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368 | } else {
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369 | if (argv[0] && argv[1]) {
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370 | xmove_fd(xopen_stdin(argv[1]), STDIN_FILENO);
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371 | }
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372 | }
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373 | if (argv[0]) {
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374 | oldname = xstrdup(argv[0]);
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375 | newname = xstrdup(argv[0]);
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376 | }
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377 |
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378 | // Loop through the lines in the patch
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379 | for(;;) {
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380 | char *patchline;
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381 |
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382 | patchline = xmalloc_fgetline(stdin);
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383 | if (!patchline) break;
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384 |
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385 | // Other versions of patch accept damaged patches,
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386 | // so we need to also.
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387 | if (!*patchline) {
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388 | free(patchline);
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389 | patchline = xstrdup(" ");
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390 | }
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391 |
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392 | // Are we assembling a hunk?
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393 | if (state >= 2) {
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394 | if (*patchline==' ' || *patchline=='+' || *patchline=='-') {
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395 | dlist_add(&TT.current_hunk, patchline);
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396 |
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397 | if (*patchline != '+') oldlen--;
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398 | if (*patchline != '-') newlen--;
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399 |
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400 | // Context line?
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401 | if (*patchline==' ' && state==2) TT.context++;
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402 | else state=3;
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403 |
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404 | // If we've consumed all expected hunk lines, apply the hunk.
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405 |
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406 | if (!oldlen && !newlen) state = apply_one_hunk();
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407 | continue;
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408 | }
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409 | fail_hunk();
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410 | state = 0;
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411 | continue;
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412 | }
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413 |
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414 | // Open a new file?
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415 | if (!strncmp("--- ", patchline, 4) || !strncmp("+++ ", patchline, 4)) {
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416 | char *s, **name = reverse ? &newname : &oldname;
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417 | int i;
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418 |
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419 | if (*patchline == '+') {
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420 | name = reverse ? &oldname : &newname;
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421 | state = 1;
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422 | }
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423 |
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424 | finish_oldfile();
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425 |
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426 | if (!argv[0]) {
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427 | free(*name);
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428 | // Trim date from end of filename (if any). We don't care.
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429 | for (s = patchline+4; *s && *s!='\t'; s++)
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430 | if (*s=='\\' && s[1]) s++;
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431 | i = atoi(s);
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432 | if (i>1900 && i<=1970)
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433 | *name = xstrdup("/dev/null");
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434 | else {
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435 | *s = 0;
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436 | *name = xstrdup(patchline+4);
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437 | }
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438 | }
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439 |
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440 | // We defer actually opening the file because svn produces broken
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441 | // patches that don't signal they want to create a new file the
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442 | // way the patch man page says, so you have to read the first hunk
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443 | // and _guess_.
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444 |
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445 | // Start a new hunk? Usually @@ -oldline,oldlen +newline,newlen @@
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446 | // but a missing ,value means the value is 1.
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447 | } else if (state == 1 && !strncmp("@@ -", patchline, 4)) {
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448 | int i;
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449 | char *s = patchline+4;
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450 |
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451 | // Read oldline[,oldlen] +newline[,newlen]
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452 |
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453 | TT.oldlen = oldlen = TT.newlen = newlen = 1;
|
---|
454 | TT.oldline = strtol(s, &s, 10);
|
---|
455 | if (*s == ',') TT.oldlen = oldlen = strtol(s+1, &s, 10);
|
---|
456 | TT.newline = strtol(s+2, &s, 10);
|
---|
457 | if (*s == ',') TT.newlen = newlen = strtol(s+1, &s, 10);
|
---|
458 |
|
---|
459 | if (oldlen < 1 && newlen < 1)
|
---|
460 | bb_error_msg_and_die("Really? %s", patchline);
|
---|
461 |
|
---|
462 | TT.context = 0;
|
---|
463 | state = 2;
|
---|
464 |
|
---|
465 | // If this is the first hunk, open the file.
|
---|
466 | if (TT.filein == -1) {
|
---|
467 | int oldsum, newsum, empty = 0;
|
---|
468 | char *name;
|
---|
469 |
|
---|
470 | oldsum = TT.oldline + oldlen;
|
---|
471 | newsum = TT.newline + newlen;
|
---|
472 |
|
---|
473 | name = reverse ? oldname : newname;
|
---|
474 |
|
---|
475 | // We're deleting oldname if new file is /dev/null (before -p)
|
---|
476 | // or if new hunk is empty (zero context) after patching
|
---|
477 | if (!strcmp(name, "/dev/null") || !(reverse ? oldsum : newsum)) {
|
---|
478 | name = reverse ? newname : oldname;
|
---|
479 | empty++;
|
---|
480 | }
|
---|
481 |
|
---|
482 | // handle -p path truncation.
|
---|
483 | for (i = 0, s = name; *s;) {
|
---|
484 | if ((option_mask32 & FLAG_PATHLEN) && TT.prefix == i)
|
---|
485 | break;
|
---|
486 | if (*s++ != '/')
|
---|
487 | continue;
|
---|
488 | while (*s == '/')
|
---|
489 | s++;
|
---|
490 | i++;
|
---|
491 | name = s;
|
---|
492 | }
|
---|
493 |
|
---|
494 | if (empty) {
|
---|
495 | // File is empty after the patches have been applied
|
---|
496 | state = 0;
|
---|
497 | if (option_mask32 & FLAG_RMEMPTY) {
|
---|
498 | // If flag -E or --remove-empty-files is set
|
---|
499 | printf("removing %s\n", name);
|
---|
500 | xunlink(name);
|
---|
501 | } else {
|
---|
502 | printf("patching file %s\n", name);
|
---|
503 | xclose(xopen(name, O_WRONLY | O_TRUNC));
|
---|
504 | }
|
---|
505 | // If we've got a file to open, do so.
|
---|
506 | } else if (!(option_mask32 & FLAG_PATHLEN) || i <= TT.prefix) {
|
---|
507 | struct stat statbuf;
|
---|
508 |
|
---|
509 | // If the old file was null, we're creating a new one.
|
---|
510 | if (!strcmp(oldname, "/dev/null") || !oldsum) {
|
---|
511 | printf("creating %s\n", name);
|
---|
512 | s = strrchr(name, '/');
|
---|
513 | if (s) {
|
---|
514 | *s = 0;
|
---|
515 | bb_make_directory(name, -1, FILEUTILS_RECUR);
|
---|
516 | *s = '/';
|
---|
517 | }
|
---|
518 | TT.filein = xopen(name, O_CREAT|O_EXCL|O_RDWR);
|
---|
519 | } else {
|
---|
520 | printf("patching file %s\n", name);
|
---|
521 | TT.filein = xopen(name, O_RDONLY);
|
---|
522 | }
|
---|
523 |
|
---|
524 | TT.tempname = xasprintf("%sXXXXXX", name);
|
---|
525 | TT.fileout = xmkstemp(TT.tempname);
|
---|
526 | // Set permissions of output file
|
---|
527 | fstat(TT.filein, &statbuf);
|
---|
528 | fchmod(TT.fileout, statbuf.st_mode);
|
---|
529 |
|
---|
530 | TT.linenum = 0;
|
---|
531 | TT.hunknum = 0;
|
---|
532 | }
|
---|
533 | }
|
---|
534 |
|
---|
535 | TT.hunknum++;
|
---|
536 |
|
---|
537 | continue;
|
---|
538 | }
|
---|
539 |
|
---|
540 | // If we didn't continue above, discard this line.
|
---|
541 | free(patchline);
|
---|
542 | }
|
---|
543 |
|
---|
544 | finish_oldfile();
|
---|
545 |
|
---|
546 | if (ENABLE_FEATURE_CLEAN_UP) {
|
---|
547 | free(oldname);
|
---|
548 | free(newname);
|
---|
549 | }
|
---|
550 |
|
---|
551 | return TT.exitval;
|
---|
552 | }
|
---|