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                 struct strbuf buffer1 = STRBUF_INIT;
  67                 struct strbuf buffer2 = STRBUF_INIT;
  68                 struct string_list p1 = STRING_LIST_INIT_DUP;
  69                 struct string_list p2 = STRING_LIST_INIT_DUP;
  70                 int i1, i2, ret = 0;
  71                 size_t len1 = 0, len2 = 0;
  72
  73                 if (name1 && read_directory(name1, &p1))
  74                         return -1;
  75                 if (name2 && read_directory(name2, &p2)) {
  76                         string_list_clear(&p1, 0);
  77                         return -1;
  78                 }
  79
  80                 if (name1) {
  81                         strbuf_addstr(&buffer1, name1);
  82                         if (buffer1.len && buffer1.buf[buffer1.len - 1] != '/')
  83                                 strbuf_addch(&buffer1, '/');
  84                         len1 = buffer1.len;
  85                 }
  86
  87                 if (name2) {
  88                         strbuf_addstr(&buffer2, name2);
  89                         if (buffer2.len && buffer2.buf[buffer2.len - 1] != '/')
  90                                 strbuf_addch(&buffer2, '/');
  91                         len2 = buffer2.len;
  92                 }
  93
  94                 for (i1 = i2 = 0; !ret && (i1 < p1.nr || i2 < p2.nr); ) {
  95                         const char *n1, *n2;
  96                         int comp;
  97
  98                         strbuf_setlen(&buffer1, len1);
  99                         strbuf_setlen(&buffer2, len2);
 100
 101                         if (i1 == p1.nr)
 102                                 comp = 1;
 103                         else if (i2 == p2.nr)
 104                                 comp = -1;
 105                         else
 106                                 comp = strcmp(p1.items[i1].string, p2.items[i2].string);
 107
 108                         if (comp > 0)
 109                                 n1 = NULL;
 110                         else {
 111                                 strbuf_addstr(&buffer1, p1.items[i1++].string);
 112                                 n1 = buffer1.buf;
 113                         }
 114
 115                         if (comp < 0)
 116                                 n2 = NULL;
 117                         else {
 118                                 strbuf_addstr(&buffer2, p2.items[i2++].string);
 119                                 n2 = buffer2.buf;
 120                         }
 121
 122                         ret = queue_diff(o, n1, n2);
 123                 }
 124                 string_list_clear(&p1, 0);
 125                 string_list_clear(&p2, 0);
 126                 strbuf_release(&buffer1);
 127                 strbuf_release(&buffer2);
 128
 129                 return ret;
 130         } else {
 131                 struct diff_filespec *d1, *d2;
 132
 133                 if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
 134                         unsigned tmp;
 135                         const char *tmp_c;
 136                         tmp = mode1; mode1 = mode2; mode2 = tmp;
 137                         tmp_c = name1; name1 = name2; name2 = tmp_c;
 138                 }
 139
 140                 if (!name1)
 141                         name1 = "/dev/null";
 142                 if (!name2)
 143                         name2 = "/dev/null";
 144                 d1 = alloc_filespec(name1);
 145                 d2 = alloc_filespec(name2);
 146                 fill_filespec(d1, null_sha1, mode1);
 147                 fill_filespec(d2, null_sha1, mode2);
 148
 149                 diff_queue(&diff_queued_diff, d1, d2);
 150                 return 0;
 151         }
 152 }
 153
 154 static int path_outside_repo(const char *path)
 155 {
 156         const char *work_tree;
 157         size_t len;
 158
 159         if (!is_absolute_path(path))
 160                 return 0;
 161         work_tree = get_git_work_tree();
 162         if (!work_tree)
 163                 return 1;
 164         len = strlen(work_tree);
 165         if (strncmp(path, work_tree, len) ||
 166             (path[len] != '\0' && path[len] != '/'))
 167                 return 1;
 168         return 0;
 169 }
 170
 171 void diff_no_index(struct rev_info *revs,
 172                    int argc, const char **argv,
 173                    int nongit, const char *prefix)
 174 {
 175         int i;
 176         int no_index = 0;
 177         unsigned options = 0;
 178
 179         /* Were we asked to do --no-index explicitly? */
 180         for (i = 1; i < argc; i++) {
 181                 if (!strcmp(argv[i], "--")) {
 182                         i++;
 183                         break;
 184                 }
 185                 if (!strcmp(argv[i], "--no-index"))
 186                         no_index = 1;
 187                 if (argv[i][0] != '-')
 188                         break;
 189         }
 190
 191         if (!no_index && !nongit) {
 192                 /*
 193                  * Inside a git repository, without --no-index.  Only
 194                  * when a path outside the repository is given,
 195                  * e.g. "git diff /var/tmp/[12]", or "git diff
 196                  * Makefile /var/tmp/Makefile", allow it to be used as
 197                  * a colourful "diff" replacement.
 198                  */
 199                 if ((argc != i + 2) ||
 200                     (!path_outside_repo(argv[i]) &&
 201                      !path_outside_repo(argv[i+1])))
 202                         return;
 203         }
 204         if (argc != i + 2)
 205                 usagef("git diff %s <path> <path>",
 206                        no_index ? "--no-index" : "[--no-index]");
 207
 208         diff_setup(&revs->diffopt);
 209         for (i = 1; i < argc - 2; ) {
 210                 int j;
 211                 if (!strcmp(argv[i], "--no-index"))
 212                         i++;
 213                 else if (!strcmp(argv[i], "-q")) {
 214                         options |= DIFF_SILENT_ON_REMOVED;
 215                         i++;
 216                 }
 217                 else if (!strcmp(argv[i], "--"))
 218                         i++;
 219                 else {
 220                         j = diff_opt_parse(&revs->diffopt, argv + i, argc - i);
 221                         if (!j)
 222                                 die("invalid diff option/value: %s", argv[i]);
 223                         i += j;
 224                 }
 225         }
 226
 227         /*
 228          * If the user asked for our exit code then don't start a
 229          * pager or we would end up reporting its exit code instead.
 230          */
 231         if (!DIFF_OPT_TST(&revs->diffopt, EXIT_WITH_STATUS))
 232                 setup_pager();
 233
 234         if (prefix) {
 235                 int len = strlen(prefix);
 236                 const char *paths[3];
 237                 memset(paths, 0, sizeof(paths));
 238
 239                 for (i = 0; i < 2; i++) {
 240                         const char *p = argv[argc - 2 + i];
 241                         /*
 242                          * stdin should be spelled as '-'; if you have
 243                          * path that is '-', spell it as ./-.
 244                          */
 245                         p = (strcmp(p, "-")
 246                              ? xstrdup(prefix_filename(prefix, len, p))
 247                              : p);
 248                         paths[i] = p;
 249                 }
 250                 diff_tree_setup_paths(paths, &revs->diffopt);
 251         }
 252         else
 253                 diff_tree_setup_paths(argv + argc - 2, &revs->diffopt);
 254         revs->diffopt.skip_stat_unmatch = 1;
 255         if (!revs->diffopt.output_format)
 256                 revs->diffopt.output_format = DIFF_FORMAT_PATCH;
 257
 258         DIFF_OPT_SET(&revs->diffopt, EXIT_WITH_STATUS);
 259         DIFF_OPT_SET(&revs->diffopt, NO_INDEX);
 260
 261         revs->max_count = -2;
 262         if (diff_setup_done(&revs->diffopt) < 0)
 263                 die("diff_setup_done failed");
 264
 265         if (queue_diff(&revs->diffopt, revs->diffopt.pathspec.raw[0],
 266                        revs->diffopt.pathspec.raw[1]))
 267                 exit(1);
 268         diff_set_mnemonic_prefix(&revs->diffopt, "1/", "2/");
 269         diffcore_std(&revs->diffopt);
 270         diff_flush(&revs->diffopt);
 271
 272         /*
 273          * The return code for --no-index imitates diff(1):
 274          * 0 = no changes, 1 = changes, else error
 275          */
 276         exit(revs->diffopt.found_changes);
 277 }