builtin-add.c

   1 /*
   2  * "git add" builtin command
   3  *
   4  * Copyright (C) 2006 Linus Torvalds
   5  */
   6 #include <fnmatch.h>
   7
   8 #include "cache.h"
   9 #include "builtin.h"
  10 #include "dir.h"
  11
  12 static const char builtin_add_usage[] =
  13 "git-add [-n] [-v] <filepattern>...";
  14
  15 static int common_prefix(const char **pathspec)
  16 {
  17         const char *path, *slash, *next;
  18         int prefix;
  19
  20         if (!pathspec)
  21                 return 0;
  22
  23         path = *pathspec;
  24         slash = strrchr(path, '/');
  25         if (!slash)
  26                 return 0;
  27
  28         prefix = slash - path + 1;
  29         while ((next = *++pathspec) != NULL) {
  30                 int len = strlen(next);
  31                 if (len >= prefix && !memcmp(path, next, len))
  32                         continue;
  33                 for (;;) {
  34                         if (!len)
  35                                 return 0;
  36                         if (next[--len] != '/')
  37                                 continue;
  38                         if (memcmp(path, next, len+1))
  39                                 continue;
  40                         prefix = len + 1;
  41                         break;
  42                 }
  43         }
  44         return prefix;
  45 }
  46
  47 static int match_one(const char *match, const char *name, int namelen)
  48 {
  49         int matchlen;
  50
  51         /* If the match was just the prefix, we matched */
  52         matchlen = strlen(match);
  53         if (!matchlen)
  54                 return 1;
  55
  56         /*
  57          * If we don't match the matchstring exactly,
  58          * we need to match by fnmatch
  59          */
  60         if (strncmp(match, name, matchlen))
  61                 return !fnmatch(match, name, 0);
  62
  63         /*
  64          * If we did match the string exactly, we still
  65          * need to make sure that it happened on a path
  66          * component boundary (ie either the last character
  67          * of the match was '/', or the next character of
  68          * the name was '/' or the terminating NUL.
  69          */
  70         return  match[matchlen-1] == '/' ||
  71                 name[matchlen] == '/' ||
  72                 !name[matchlen];
  73 }
  74
  75 static int match(const char **pathspec, const char *name, int namelen, int prefix, char *seen)
  76 {
  77         int retval;
  78         const char *match;
  79
  80         name += prefix;
  81         namelen -= prefix;
  82
  83         for (retval = 0; (match = *pathspec++) != NULL; seen++) {
  84                 if (retval & *seen)
  85                         continue;
  86                 match += prefix;
  87                 if (match_one(match, name, namelen)) {
  88                         retval = 1;
  89                         *seen = 1;
  90                 }
  91         }
  92         return retval;
  93 }
  94
  95 static void prune_directory(struct dir_struct *dir, const char **pathspec, int prefix)
  96 {
  97         char *seen;
  98         int i, specs;
  99         struct dir_entry **src, **dst;
 100
 101         for (specs = 0; pathspec[specs];  specs++)
 102                 /* nothing */;
 103         seen = xmalloc(specs);
 104         memset(seen, 0, specs);
 105
 106         src = dst = dir->entries;
 107         i = dir->nr;
 108         while (--i >= 0) {
 109                 struct dir_entry *entry = *src++;
 110                 if (!match(pathspec, entry->name, entry->len, prefix, seen)) {
 111                         free(entry);
 112                         continue;
 113                 }
 114                 *dst++ = entry;
 115         }
 116         dir->nr = dst - dir->entries;
 117
 118         for (i = 0; i < specs; i++) {
 119                 struct stat st;
 120                 const char *match;
 121                 if (seen[i])
 122                         continue;
 123
 124                 /* Existing file? We must have ignored it */
 125                 match = pathspec[i];
 126                 if (!match[0] || !lstat(match, &st))
 127                         continue;
 128                 die("pathspec '%s' did not match any files", match);
 129         }
 130 }
 131
 132 static void fill_directory(struct dir_struct *dir, const char **pathspec)
 133 {
 134         const char *path, *base;
 135         int baselen;
 136
 137         /* Set up the default git porcelain excludes */
 138         memset(dir, 0, sizeof(*dir));
 139         dir->exclude_per_dir = ".gitignore";
 140         path = git_path("info/exclude");
 141         if (!access(path, R_OK))
 142                 add_excludes_from_file(dir, path);
 143
 144         /*
 145          * Calculate common prefix for the pathspec, and
 146          * use that to optimize the directory walk
 147          */
 148         baselen = common_prefix(pathspec);
 149         path = ".";
 150         base = "";
 151         if (baselen) {
 152                 char *common = xmalloc(baselen + 1);
 153                 common = xmalloc(baselen + 1);
 154                 memcpy(common, *pathspec, baselen);
 155                 common[baselen] = 0;
 156                 path = base = common;
 157         }
 158
 159         /* Read the directory and prune it */
 160         read_directory(dir, path, base, baselen);
 161         if (pathspec)
 162                 prune_directory(dir, pathspec, baselen);
 163 }
 164
 165 static int add_file_to_index(const char *path, int verbose)
 166 {
 167         int size, namelen;
 168         struct stat st;
 169         struct cache_entry *ce;
 170
 171         if (lstat(path, &st))
 172                 die("%s: unable to stat (%s)", path, strerror(errno));
 173
 174         if (!S_ISREG(st.st_mode) && !S_ISLNK(st.st_mode))
 175                 die("%s: can only add regular files or symbolic links", path);
 176
 177         namelen = strlen(path);
 178         size = cache_entry_size(namelen);
 179         ce = xcalloc(1, size);
 180         memcpy(ce->name, path, namelen);
 181         ce->ce_flags = htons(namelen);
 182         fill_stat_cache_info(ce, &st);
 183
 184         ce->ce_mode = create_ce_mode(st.st_mode);
 185         if (!trust_executable_bit) {
 186                 /* If there is an existing entry, pick the mode bits
 187                  * from it.
 188                  */
 189                 int pos = cache_name_pos(path, namelen);
 190                 if (pos >= 0)
 191                         ce->ce_mode = active_cache[pos]->ce_mode;
 192         }
 193
 194         if (index_path(ce->sha1, path, &st, 1))
 195                 die("unable to index file %s", path);
 196         if (add_cache_entry(ce, ADD_CACHE_OK_TO_ADD))
 197                 die("unable to add %s to index",path);
 198         if (verbose)
 199                 printf("add '%s'\n", path);
 200         return 0;
 201 }
 202
 203 static struct cache_file cache_file;
 204
 205 int cmd_add(int argc, const char **argv, char **envp)
 206 {
 207         int i, newfd;
 208         int verbose = 0, show_only = 0;
 209         const char *prefix = setup_git_directory();
 210         const char **pathspec;
 211         struct dir_struct dir;
 212
 213         git_config(git_default_config);
 214
 215         newfd = hold_index_file_for_update(&cache_file, get_index_file());
 216         if (newfd < 0)
 217                 die("unable to create new cachefile");
 218
 219         if (read_cache() < 0)
 220                 die("index file corrupt");
 221
 222         for (i = 1; i < argc; i++) {
 223                 const char *arg = argv[i];
 224
 225                 if (arg[0] != '-')
 226                         break;
 227                 if (!strcmp(arg, "--")) {
 228                         i++;
 229                         break;
 230                 }
 231                 if (!strcmp(arg, "-n")) {
 232                         show_only = 1;
 233                         continue;
 234                 }
 235                 if (!strcmp(arg, "-v")) {
 236                         verbose = 1;
 237                         continue;
 238                 }
 239                 die(builtin_add_usage);
 240         }
 241         git_config(git_default_config);
 242         pathspec = get_pathspec(prefix, argv + i);
 243
 244         fill_directory(&dir, pathspec);
 245
 246         if (show_only) {
 247                 const char *sep = "", *eof = "";
 248                 for (i = 0; i < dir.nr; i++) {
 249                         printf("%s%s", sep, dir.entries[i]->name);
 250                         sep = " ";
 251                         eof = "\n";
 252                 }
 253                 fputs(eof, stdout);
 254                 return 0;
 255         }
 256
 257         for (i = 0; i < dir.nr; i++)
 258                 add_file_to_index(dir.entries[i]->name, verbose);
 259
 260         if (active_cache_changed) {
 261                 if (write_cache(newfd, active_cache, active_nr) ||
 262                     commit_index_file(&cache_file))
 263                         die("Unable to write new index file");
 264         }
 265
 266         return 0;
 267 }