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