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 #include "dir.h"
  19
  20 static int read_directory_contents(const char *path, struct string_list *list)
  21 {
  22         DIR *dir;
  23         struct dirent *e;
  24
  25         if (!(dir = opendir(path)))
  26                 return error("Could not open directory %s", path);
  27
  28         while ((e = readdir(dir)))
  29                 if (!is_dot_or_dotdot(e->d_name))
  30                         string_list_insert(list, e->d_name);
  31
  32         closedir(dir);
  33         return 0;
  34 }
  35
  36 /*
  37  * This should be "(standard input)" or something, but it will
  38  * probably expose many more breakages in the way no-index code
  39  * is bolted onto the diff callchain.
  40  */
  41 static const char file_from_standard_input[] = "-";
  42
  43 static int get_mode(const char *path, int *mode)
  44 {
  45         struct stat st;
  46
  47         if (!path || !strcmp(path, "/dev/null"))
  48                 *mode = 0;
  49 #ifdef GIT_WINDOWS_NATIVE
  50         else if (!strcasecmp(path, "nul"))
  51                 *mode = 0;
  52 #endif
  53         else if (path == file_from_standard_input)
  54                 *mode = create_ce_mode(0666);
  55         else if (lstat(path, &st))
  56                 return error("Could not access '%s'", path);
  57         else
  58                 *mode = st.st_mode;
  59         return 0;
  60 }
  61
  62 static int populate_from_stdin(struct diff_filespec *s)
  63 {
  64         struct strbuf buf = STRBUF_INIT;
  65         size_t size = 0;
  66
  67         if (strbuf_read(&buf, 0, 0) < 0)
  68                 return error("error while reading from stdin %s",
  69                                      strerror(errno));
  70
  71         s->should_munmap = 0;
  72         s->data = strbuf_detach(&buf, &size);
  73         s->size = size;
  74         s->should_free = 1;
  75         s->is_stdin = 1;
  76         return 0;
  77 }
  78
  79 static struct diff_filespec *noindex_filespec(const char *name, int mode)
  80 {
  81         struct diff_filespec *s;
  82
  83         if (!name)
  84                 name = "/dev/null";
  85         s = alloc_filespec(name);
  86         fill_filespec(s, null_sha1, 0, mode);
  87         if (name == file_from_standard_input)
  88                 populate_from_stdin(s);
  89         return s;
  90 }
  91
  92 static int queue_diff(struct diff_options *o,
  93                       const char *name1, const char *name2)
  94 {
  95         int mode1 = 0, mode2 = 0;
  96
  97         if (get_mode(name1, &mode1) || get_mode(name2, &mode2))
  98                 return -1;
  99
 100         if (mode1 && mode2 && S_ISDIR(mode1) != S_ISDIR(mode2))
 101                 return error("file/directory conflict: %s, %s", name1, name2);
 102
 103         if (S_ISDIR(mode1) || S_ISDIR(mode2)) {
 104                 struct strbuf buffer1 = STRBUF_INIT;
 105                 struct strbuf buffer2 = STRBUF_INIT;
 106                 struct string_list p1 = STRING_LIST_INIT_DUP;
 107                 struct string_list p2 = STRING_LIST_INIT_DUP;
 108                 int i1, i2, ret = 0;
 109                 size_t len1 = 0, len2 = 0;
 110
 111                 if (name1 && read_directory_contents(name1, &p1))
 112                         return -1;
 113                 if (name2 && read_directory_contents(name2, &p2)) {
 114                         string_list_clear(&p1, 0);
 115                         return -1;
 116                 }
 117
 118                 if (name1) {
 119                         strbuf_addstr(&buffer1, name1);
 120                         if (buffer1.len && buffer1.buf[buffer1.len - 1] != '/')
 121                                 strbuf_addch(&buffer1, '/');
 122                         len1 = buffer1.len;
 123                 }
 124
 125                 if (name2) {
 126                         strbuf_addstr(&buffer2, name2);
 127                         if (buffer2.len && buffer2.buf[buffer2.len - 1] != '/')
 128                                 strbuf_addch(&buffer2, '/');
 129                         len2 = buffer2.len;
 130                 }
 131
 132                 for (i1 = i2 = 0; !ret && (i1 < p1.nr || i2 < p2.nr); ) {
 133                         const char *n1, *n2;
 134                         int comp;
 135
 136                         strbuf_setlen(&buffer1, len1);
 137                         strbuf_setlen(&buffer2, len2);
 138
 139                         if (i1 == p1.nr)
 140                                 comp = 1;
 141                         else if (i2 == p2.nr)
 142                                 comp = -1;
 143                         else
 144                                 comp = strcmp(p1.items[i1].string, p2.items[i2].string);
 145
 146                         if (comp > 0)
 147                                 n1 = NULL;
 148                         else {
 149                                 strbuf_addstr(&buffer1, p1.items[i1++].string);
 150                                 n1 = buffer1.buf;
 151                         }
 152
 153                         if (comp < 0)
 154                                 n2 = NULL;
 155                         else {
 156                                 strbuf_addstr(&buffer2, p2.items[i2++].string);
 157                                 n2 = buffer2.buf;
 158                         }
 159
 160                         ret = queue_diff(o, n1, n2);
 161                 }
 162                 string_list_clear(&p1, 0);
 163                 string_list_clear(&p2, 0);
 164                 strbuf_release(&buffer1);
 165                 strbuf_release(&buffer2);
 166
 167                 return ret;
 168         } else {
 169                 struct diff_filespec *d1, *d2;
 170
 171                 if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
 172                         unsigned tmp;
 173                         const char *tmp_c;
 174                         tmp = mode1; mode1 = mode2; mode2 = tmp;
 175                         tmp_c = name1; name1 = name2; name2 = tmp_c;
 176                 }
 177
 178                 d1 = noindex_filespec(name1, mode1);
 179                 d2 = noindex_filespec(name2, mode2);
 180                 diff_queue(&diff_queued_diff, d1, d2);
 181                 return 0;
 182         }
 183 }
 184
 185 void diff_no_index(struct rev_info *revs,
 186                    int argc, const char **argv,
 187                    const char *prefix)
 188 {
 189         int i, prefixlen;
 190         const char *paths[2];
 191
 192         diff_setup(&revs->diffopt);
 193         for (i = 1; i < argc - 2; ) {
 194                 int j;
 195                 if (!strcmp(argv[i], "--no-index"))
 196                         i++;
 197                 else if (!strcmp(argv[i], "--"))
 198                         i++;
 199                 else {
 200                         j = diff_opt_parse(&revs->diffopt, argv + i, argc - i);
 201                         if (j <= 0)
 202                                 die("invalid diff option/value: %s", argv[i]);
 203                         i += j;
 204                 }
 205         }
 206
 207         prefixlen = prefix ? strlen(prefix) : 0;
 208         for (i = 0; i < 2; i++) {
 209                 const char *p = argv[argc - 2 + i];
 210                 if (!strcmp(p, "-"))
 211                         /*
 212                          * stdin should be spelled as "-"; if you have
 213                          * path that is "-", spell it as "./-".
 214                          */
 215                         p = file_from_standard_input;
 216                 else if (prefixlen)
 217                         p = xstrdup(prefix_filename(prefix, prefixlen, p));
 218                 paths[i] = p;
 219         }
 220         revs->diffopt.skip_stat_unmatch = 1;
 221         if (!revs->diffopt.output_format)
 222                 revs->diffopt.output_format = DIFF_FORMAT_PATCH;
 223
 224         DIFF_OPT_SET(&revs->diffopt, NO_INDEX);
 225
 226         revs->max_count = -2;
 227         diff_setup_done(&revs->diffopt);
 228
 229         setup_diff_pager(&revs->diffopt);
 230         DIFF_OPT_SET(&revs->diffopt, EXIT_WITH_STATUS);
 231
 232         if (queue_diff(&revs->diffopt, paths[0], paths[1]))
 233                 exit(1);
 234         diff_set_mnemonic_prefix(&revs->diffopt, "1/", "2/");
 235         diffcore_std(&revs->diffopt);
 236         diff_flush(&revs->diffopt);
 237
 238         /*
 239          * The return code for --no-index imitates diff(1):
 240          * 0 = no changes, 1 = changes, else error
 241          */
 242         exit(diff_result_code(&revs->diffopt, 0));
 243 }