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 (stat(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                         return;
 178                 if (!strcmp(argv[i], "--no-index"))
 179                         no_index = 1;
 180                 if (argv[i][0] != '-')
 181                         break;
 182         }
 183
 184         if (!no_index && !nongit) {
 185                 /*
 186                  * Inside a git repository, without --no-index.  Only
 187                  * when a path outside the repository is given,
 188                  * e.g. "git diff /var/tmp/[12]", or "git diff
 189                  * Makefile /var/tmp/Makefile", allow it to be used as
 190                  * a colourful "diff" replacement.
 191                  */
 192                 if ((argc != i + 2) ||
 193                     (!path_outside_repo(argv[i]) &&
 194                      !path_outside_repo(argv[i+1])))
 195                         return;
 196         }
 197         if (argc != i + 2)
 198                 die("git diff %s takes two paths",
 199                     no_index ? "--no-index" : "[--no-index]");
 200
 201         /*
 202          * If the user asked for our exit code then don't start a
 203          * pager or we would end up reporting its exit code instead.
 204          */
 205         if (!DIFF_OPT_TST(&revs->diffopt, EXIT_WITH_STATUS))
 206                 setup_pager();
 207
 208         diff_setup(&revs->diffopt);
 209         if (!revs->diffopt.output_format)
 210                 revs->diffopt.output_format = DIFF_FORMAT_PATCH;
 211         for (i = 1; i < argc - 2; ) {
 212                 int j;
 213                 if (!strcmp(argv[i], "--no-index"))
 214                         i++;
 215                 else if (!strcmp(argv[1], "-q"))
 216                         options |= DIFF_SILENT_ON_REMOVED;
 217                 else {
 218                         j = diff_opt_parse(&revs->diffopt, argv + i, argc - i);
 219                         if (!j)
 220                                 die("invalid diff option/value: %s", argv[i]);
 221                         i += j;
 222                 }
 223         }
 224
 225         if (prefix) {
 226                 int len = strlen(prefix);
 227
 228                 revs->diffopt.paths = xcalloc(2, sizeof(char*));
 229                 for (i = 0; i < 2; i++) {
 230                         const char *p = argv[argc - 2 + i];
 231                         /*
 232                          * stdin should be spelled as '-'; if you have
 233                          * path that is '-', spell it as ./-.
 234                          */
 235                         p = (strcmp(p, "-")
 236                              ? xstrdup(prefix_filename(prefix, len, p))
 237                              : p);
 238                         revs->diffopt.paths[i] = p;
 239                 }
 240         }
 241         else
 242                 revs->diffopt.paths = argv + argc - 2;
 243         revs->diffopt.nr_paths = 2;
 244
 245         DIFF_OPT_SET(&revs->diffopt, EXIT_WITH_STATUS);
 246         DIFF_OPT_SET(&revs->diffopt, NO_INDEX);
 247
 248         revs->max_count = -2;
 249         if (diff_setup_done(&revs->diffopt) < 0)
 250                 die("diff_setup_done failed");
 251
 252         if (queue_diff(&revs->diffopt, revs->diffopt.paths[0],
 253                        revs->diffopt.paths[1]))
 254                 exit(1);
 255         diff_set_mnemonic_prefix(&revs->diffopt, "1/", "2/");
 256         diffcore_std(&revs->diffopt);
 257         diff_flush(&revs->diffopt);
 258
 259         /*
 260          * The return code for --no-index imitates diff(1):
 261          * 0 = no changes, 1 = changes, else error
 262          */
 263         exit(revs->diffopt.found_changes);
 264 }