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(e->d_name, list);
  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         else if (!strcmp(path, "-"))
  42                 *mode = create_ce_mode(0666);
  43         else if (lstat(path, &st))
  44                 return error("Could not access '%s'", path);
  45         else
  46                 *mode = st.st_mode;
  47         return 0;
  48 }
  49
  50 static int queue_diff(struct diff_options *o,
  51                 const char *name1, const char *name2)
  52 {
  53         int mode1 = 0, mode2 = 0;
  54
  55         if (get_mode(name1, &mode1) || get_mode(name2, &mode2))
  56                 return -1;
  57
  58         if (mode1 && mode2 && S_ISDIR(mode1) != S_ISDIR(mode2))
  59                 return error("file/directory conflict: %s, %s", name1, name2);
  60
  61         if (S_ISDIR(mode1) || S_ISDIR(mode2)) {
  62                 char buffer1[PATH_MAX], buffer2[PATH_MAX];
  63                 struct string_list p1 = {NULL, 0, 0, 1}, p2 = {NULL, 0, 0, 1};
  64                 int len1 = 0, len2 = 0, i1, i2, ret = 0;
  65
  66                 if (name1 && read_directory(name1, &p1))
  67                         return -1;
  68                 if (name2 && read_directory(name2, &p2)) {
  69                         string_list_clear(&p1, 0);
  70                         return -1;
  71                 }
  72
  73                 if (name1) {
  74                         len1 = strlen(name1);
  75                         if (len1 > 0 && name1[len1 - 1] == '/')
  76                                 len1--;
  77                         memcpy(buffer1, name1, len1);
  78                         buffer1[len1++] = '/';
  79                 }
  80
  81                 if (name2) {
  82                         len2 = strlen(name2);
  83                         if (len2 > 0 && name2[len2 - 1] == '/')
  84                                 len2--;
  85                         memcpy(buffer2, name2, len2);
  86                         buffer2[len2++] = '/';
  87                 }
  88
  89                 for (i1 = i2 = 0; !ret && (i1 < p1.nr || i2 < p2.nr); ) {
  90                         const char *n1, *n2;
  91                         int comp;
  92
  93                         if (i1 == p1.nr)
  94                                 comp = 1;
  95                         else if (i2 == p2.nr)
  96                                 comp = -1;
  97                         else
  98                                 comp = strcmp(p1.items[i1].string,
  99                                         p2.items[i2].string);
 100
 101                         if (comp > 0)
 102                                 n1 = NULL;
 103                         else {
 104                                 n1 = buffer1;
 105                                 strncpy(buffer1 + len1, p1.items[i1++].string,
 106                                                 PATH_MAX - len1);
 107                         }
 108
 109                         if (comp < 0)
 110                                 n2 = NULL;
 111                         else {
 112                                 n2 = buffer2;
 113                                 strncpy(buffer2 + len2, p2.items[i2++].string,
 114                                                 PATH_MAX - len2);
 115                         }
 116
 117                         ret = queue_diff(o, n1, n2);
 118                 }
 119                 string_list_clear(&p1, 0);
 120                 string_list_clear(&p2, 0);
 121
 122                 return ret;
 123         } else {
 124                 struct diff_filespec *d1, *d2;
 125
 126                 if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
 127                         unsigned tmp;
 128                         const char *tmp_c;
 129                         tmp = mode1; mode1 = mode2; mode2 = tmp;
 130                         tmp_c = name1; name1 = name2; name2 = tmp_c;
 131                 }
 132
 133                 if (!name1)
 134                         name1 = "/dev/null";
 135                 if (!name2)
 136                         name2 = "/dev/null";
 137                 d1 = alloc_filespec(name1);
 138                 d2 = alloc_filespec(name2);
 139                 fill_filespec(d1, null_sha1, mode1);
 140                 fill_filespec(d2, null_sha1, mode2);
 141
 142                 diff_queue(&diff_queued_diff, d1, d2);
 143                 return 0;
 144         }
 145 }
 146
 147 static int path_outside_repo(const char *path)
 148 {
 149         /*
 150          * We have already done setup_git_directory_gently() so we
 151          * know we are inside a git work tree already.
 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         len = strlen(work_tree);
 160         if (strncmp(path, work_tree, len) ||
 161             (path[len] != '\0' && path[len] != '/'))
 162                 return 1;
 163         return 0;
 164 }
 165
 166 void diff_no_index(struct rev_info *revs,
 167                    int argc, const char **argv,
 168                    int nongit, const char *prefix)
 169 {
 170         int i;
 171         int no_index = 0;
 172         unsigned options = 0;
 173
 174         /* Were we asked to do --no-index explicitly? */
 175         for (i = 1; i < argc; i++) {
 176                 if (!strcmp(argv[i], "--")) {
 177                         i++;
 178                         break;
 179                 }
 180                 if (!strcmp(argv[i], "--no-index"))
 181                         no_index = 1;
 182                 if (argv[i][0] != '-')
 183                         break;
 184         }
 185
 186         if (!no_index && !nongit) {
 187                 /*
 188                  * Inside a git repository, without --no-index.  Only
 189                  * when a path outside the repository is given,
 190                  * e.g. "git diff /var/tmp/[12]", or "git diff
 191                  * Makefile /var/tmp/Makefile", allow it to be used as
 192                  * a colourful "diff" replacement.
 193                  */
 194                 if ((argc != i + 2) ||
 195                     (!path_outside_repo(argv[i]) &&
 196                      !path_outside_repo(argv[i+1])))
 197                         return;
 198         }
 199         if (argc != i + 2)
 200                 die("git diff %s takes two paths",
 201                     no_index ? "--no-index" : "[--no-index]");
 202
 203         diff_setup(&revs->diffopt);
 204         if (!revs->diffopt.output_format)
 205                 revs->diffopt.output_format = DIFF_FORMAT_PATCH;
 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
 251         DIFF_OPT_SET(&revs->diffopt, EXIT_WITH_STATUS);
 252         DIFF_OPT_SET(&revs->diffopt, NO_INDEX);
 253
 254         revs->max_count = -2;
 255         if (diff_setup_done(&revs->diffopt) < 0)
 256                 die("diff_setup_done failed");
 257
 258         if (queue_diff(&revs->diffopt, revs->diffopt.paths[0],
 259                        revs->diffopt.paths[1]))
 260                 exit(1);
 261         diff_set_mnemonic_prefix(&revs->diffopt, "1/", "2/");
 262         diffcore_std(&revs->diffopt);
 263         diff_flush(&revs->diffopt);
 264
 265         /*
 266          * The return code for --no-index imitates diff(1):
 267          * 0 = no changes, 1 = changes, else error
 268          */
 269         exit(revs->diffopt.found_changes);
 270 }