diff-no-index.c

   1 /*
   2  * "diff --no-index" support
   3  * Copyright (c) 2007 by Johannes Schindelin
   4  * Copyright (c) 2008 by Junio C Hamano
   5  */
   6
   7 #include "cache.h"
   8 #include "color.h"
   9 #include "commit.h"
  10 #include "blob.h"
  11 #include "tag.h"
  12 #include "diff.h"
  13 #include "diffcore.h"
  14 #include "revision.h"
  15 #include "log-tree.h"
  16 #include "builtin.h"
  17 #include "string-list.h"
  18
  19 static int read_directory(const char *path, struct string_list *list)
  20 {
  21         DIR *dir;
  22         struct dirent *e;
  23
  24         if (!(dir = opendir(path)))
  25                 return error("Could not open directory %s", path);
  26
  27         while ((e = readdir(dir)))
  28                 if (strcmp(".", e->d_name) && strcmp("..", e->d_name))
  29                         string_list_insert(list, e->d_name);
  30
  31         closedir(dir);
  32         return 0;
  33 }
  34
  35 static int get_mode(const char *path, int *mode)
  36 {
  37         struct stat st;
  38
  39         if (!path || !strcmp(path, "/dev/null"))
  40                 *mode = 0;
  41 #ifdef _WIN32
  42         else if (!strcasecmp(path, "nul"))
  43                 *mode = 0;
  44 #endif
  45         else if (!strcmp(path, "-"))
  46                 *mode = create_ce_mode(0666);
  47         else if (lstat(path, &st))
  48                 return error("Could not access '%s'", path);
  49         else
  50                 *mode = st.st_mode;
  51         return 0;
  52 }
  53
  54 static int queue_diff(struct diff_options *o,
  55                 const char *name1, const char *name2)
  56 {
  57         int mode1 = 0, mode2 = 0;
  58
  59         if (get_mode(name1, &mode1) || get_mode(name2, &mode2))
  60                 return -1;
  61
  62         if (mode1 && mode2 && S_ISDIR(mode1) != S_ISDIR(mode2))
  63                 return error("file/directory conflict: %s, %s", name1, name2);
  64
  65         if (S_ISDIR(mode1) || S_ISDIR(mode2)) {
  66                 char buffer1[PATH_MAX], buffer2[PATH_MAX];
  67                 struct string_list p1 = {NULL, 0, 0, 1}, p2 = {NULL, 0, 0, 1};
  68                 int len1 = 0, len2 = 0, i1, i2, ret = 0;
  69
  70                 if (name1 && read_directory(name1, &p1))
  71                         return -1;
  72                 if (name2 && read_directory(name2, &p2)) {
  73                         string_list_clear(&p1, 0);
  74                         return -1;
  75                 }
  76
  77                 if (name1) {
  78                         len1 = strlen(name1);
  79                         if (len1 > 0 && name1[len1 - 1] == '/')
  80                                 len1--;
  81                         memcpy(buffer1, name1, len1);
  82                         buffer1[len1++] = '/';
  83                 }
  84
  85                 if (name2) {
  86                         len2 = strlen(name2);
  87                         if (len2 > 0 && name2[len2 - 1] == '/')
  88                                 len2--;
  89                         memcpy(buffer2, name2, len2);
  90                         buffer2[len2++] = '/';
  91                 }
  92
  93                 for (i1 = i2 = 0; !ret && (i1 < p1.nr || i2 < p2.nr); ) {
  94                         const char *n1, *n2;
  95                         int comp;
  96
  97                         if (i1 == p1.nr)
  98                                 comp = 1;
  99                         else if (i2 == p2.nr)
 100                                 comp = -1;
 101                         else
 102                                 comp = strcmp(p1.items[i1].string,
 103                                         p2.items[i2].string);
 104
 105                         if (comp > 0)
 106                                 n1 = NULL;
 107                         else {
 108                                 n1 = buffer1;
 109                                 strncpy(buffer1 + len1, p1.items[i1++].string,
 110                                                 PATH_MAX - len1);
 111                         }
 112
 113                         if (comp < 0)
 114                                 n2 = NULL;
 115                         else {
 116                                 n2 = buffer2;
 117                                 strncpy(buffer2 + len2, p2.items[i2++].string,
 118                                                 PATH_MAX - len2);
 119                         }
 120
 121                         ret = queue_diff(o, n1, n2);
 122                 }
 123                 string_list_clear(&p1, 0);
 124                 string_list_clear(&p2, 0);
 125
 126                 return ret;
 127         } else {
 128                 struct diff_filespec *d1, *d2;
 129
 130                 if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
 131                         unsigned tmp;
 132                         const char *tmp_c;
 133                         tmp = mode1; mode1 = mode2; mode2 = tmp;
 134                         tmp_c = name1; name1 = name2; name2 = tmp_c;
 135                 }
 136
 137                 if (!name1)
 138                         name1 = "/dev/null";
 139                 if (!name2)
 140                         name2 = "/dev/null";
 141                 d1 = alloc_filespec(name1);
 142                 d2 = alloc_filespec(name2);
 143                 fill_filespec(d1, null_sha1, mode1);
 144                 fill_filespec(d2, null_sha1, mode2);
 145
 146                 diff_queue(&diff_queued_diff, d1, d2);
 147                 return 0;
 148         }
 149 }
 150
 151 static int path_outside_repo(const char *path)
 152 {
 153         const char *work_tree;
 154         size_t len;
 155
 156         if (!is_absolute_path(path))
 157                 return 0;
 158         work_tree = get_git_work_tree();
 159         if (!work_tree)
 160                 return 1;
 161         len = strlen(work_tree);
 162         if (strncmp(path, work_tree, len) ||
 163             (path[len] != '\0' && path[len] != '/'))
 164                 return 1;
 165         return 0;
 166 }
 167
 168 void diff_no_index(struct rev_info *revs,
 169                    int argc, const char **argv,
 170                    int nongit, const char *prefix)
 171 {
 172         int i;
 173         int no_index = 0;
 174         unsigned options = 0;
 175
 176         /* Were we asked to do --no-index explicitly? */
 177         for (i = 1; i < argc; i++) {
 178                 if (!strcmp(argv[i], "--")) {
 179                         i++;
 180                         break;
 181                 }
 182                 if (!strcmp(argv[i], "--no-index"))
 183                         no_index = 1;
 184                 if (argv[i][0] != '-')
 185                         break;
 186         }
 187
 188         if (!no_index && !nongit) {
 189                 /*
 190                  * Inside a git repository, without --no-index.  Only
 191                  * when a path outside the repository is given,
 192                  * e.g. "git diff /var/tmp/[12]", or "git diff
 193                  * Makefile /var/tmp/Makefile", allow it to be used as
 194                  * a colourful "diff" replacement.
 195                  */
 196                 if ((argc != i + 2) ||
 197                     (!path_outside_repo(argv[i]) &&
 198                      !path_outside_repo(argv[i+1])))
 199                         return;
 200         }
 201         if (argc != i + 2)
 202                 usagef("git diff %s <path> <path>",
 203                        no_index ? "--no-index" : "[--no-index]");
 204
 205         diff_setup(&revs->diffopt);
 206         for (i = 1; i < argc - 2; ) {
 207                 int j;
 208                 if (!strcmp(argv[i], "--no-index"))
 209                         i++;
 210                 else if (!strcmp(argv[i], "-q")) {
 211                         options |= DIFF_SILENT_ON_REMOVED;
 212                         i++;
 213                 }
 214                 else if (!strcmp(argv[i], "--"))
 215                         i++;
 216                 else {
 217                         j = diff_opt_parse(&revs->diffopt, argv + i, argc - i);
 218                         if (!j)
 219                                 die("invalid diff option/value: %s", argv[i]);
 220                         i += j;
 221                 }
 222         }
 223
 224         /*
 225          * If the user asked for our exit code then don't start a
 226          * pager or we would end up reporting its exit code instead.
 227          */
 228         if (!DIFF_OPT_TST(&revs->diffopt, EXIT_WITH_STATUS))
 229                 setup_pager();
 230
 231         if (prefix) {
 232                 int len = strlen(prefix);
 233
 234                 revs->diffopt.paths = xcalloc(2, sizeof(char *));
 235                 for (i = 0; i < 2; i++) {
 236                         const char *p = argv[argc - 2 + i];
 237                         /*
 238                          * stdin should be spelled as '-'; if you have
 239                          * path that is '-', spell it as ./-.
 240                          */
 241                         p = (strcmp(p, "-")
 242                              ? xstrdup(prefix_filename(prefix, len, p))
 243                              : p);
 244                         revs->diffopt.paths[i] = p;
 245                 }
 246         }
 247         else
 248                 revs->diffopt.paths = argv + argc - 2;
 249         revs->diffopt.nr_paths = 2;
 250         revs->diffopt.skip_stat_unmatch = 1;
 251         if (!revs->diffopt.output_format)
 252                 revs->diffopt.output_format = DIFF_FORMAT_PATCH;
 253
 254         DIFF_OPT_SET(&revs->diffopt, EXIT_WITH_STATUS);
 255         DIFF_OPT_SET(&revs->diffopt, NO_INDEX);
 256
 257         revs->max_count = -2;
 258         if (diff_setup_done(&revs->diffopt) < 0)
 259                 die("diff_setup_done failed");
 260
 261         if (queue_diff(&revs->diffopt, revs->diffopt.paths[0],
 262                        revs->diffopt.paths[1]))
 263                 exit(1);
 264         diff_set_mnemonic_prefix(&revs->diffopt, "1/", "2/");
 265         diffcore_std(&revs->diffopt);
 266         diff_flush(&revs->diffopt);
 267
 268         /*
 269          * The return code for --no-index imitates diff(1):
 270          * 0 = no changes, 1 = changes, else error
 271          */
 272         exit(revs->diffopt.found_changes);
 273 }