pathspec.c

   1 #include "cache.h"
   2 #include "dir.h"
   3 #include "pathspec.h"
   4
   5 /*
   6  * Finds which of the given pathspecs match items in the index.
   7  *
   8  * For each pathspec, sets the corresponding entry in the seen[] array
   9  * (which should be specs items long, i.e. the same size as pathspec)
  10  * to the nature of the "closest" (i.e. most specific) match found for
  11  * that pathspec in the index, if it was a closer type of match than
  12  * the existing entry.  As an optimization, matching is skipped
  13  * altogether if seen[] already only contains non-zero entries.
  14  *
  15  * If seen[] has not already been written to, it may make sense
  16  * to use find_pathspecs_matching_against_index() instead.
  17  */
  18 void add_pathspec_matches_against_index(const char **pathspec,
  19                                         char *seen, int specs)
  20 {
  21         int num_unmatched = 0, i;
  22
  23         /*
  24          * Since we are walking the index as if we were walking the directory,
  25          * we have to mark the matched pathspec as seen; otherwise we will
  26          * mistakenly think that the user gave a pathspec that did not match
  27          * anything.
  28          */
  29         for (i = 0; i < specs; i++)
  30                 if (!seen[i])
  31                         num_unmatched++;
  32         if (!num_unmatched)
  33                 return;
  34         for (i = 0; i < active_nr; i++) {
  35                 const struct cache_entry *ce = active_cache[i];
  36                 match_pathspec(pathspec, ce->name, ce_namelen(ce), 0, seen);
  37         }
  38 }
  39
  40 /*
  41  * Finds which of the given pathspecs match items in the index.
  42  *
  43  * This is a one-shot wrapper around add_pathspec_matches_against_index()
  44  * which allocates, populates, and returns a seen[] array indicating the
  45  * nature of the "closest" (i.e. most specific) matches which each of the
  46  * given pathspecs achieves against all items in the index.
  47  */
  48 char *find_pathspecs_matching_against_index(const char **pathspec)
  49 {
  50         char *seen;
  51         int i;
  52
  53         for (i = 0; pathspec[i];  i++)
  54                 ; /* just counting */
  55         seen = xcalloc(i, 1);
  56         add_pathspec_matches_against_index(pathspec, seen, i);
  57         return seen;
  58 }
  59
  60 /*
  61  * Check the index to see whether path refers to a submodule, or
  62  * something inside a submodule.  If the former, returns the path with
  63  * any trailing slash stripped.  If the latter, dies with an error
  64  * message.
  65  */
  66 const char *check_path_for_gitlink(const char *path)
  67 {
  68         int i, path_len = strlen(path);
  69         for (i = 0; i < active_nr; i++) {
  70                 const struct cache_entry *ce = active_cache[i];
  71                 if (S_ISGITLINK(ce->ce_mode)) {
  72                         int ce_len = ce_namelen(ce);
  73                         if (path_len <= ce_len || path[ce_len] != '/' ||
  74                             memcmp(ce->name, path, ce_len))
  75                                 /* path does not refer to this
  76                                  * submodule or anything inside it */
  77                                 continue;
  78                         if (path_len == ce_len + 1) {
  79                                 /* path refers to submodule;
  80                                  * strip trailing slash */
  81                                 return xstrndup(ce->name, ce_len);
  82                         } else {
  83                                 die (_("Path '%s' is in submodule '%.*s'"),
  84                                      path, ce_len, ce->name);
  85                         }
  86                 }
  87         }
  88         return path;
  89 }
  90
  91 /*
  92  * Dies if the given path refers to a file inside a symlinked
  93  * directory in the index.
  94  */
  95 void die_if_path_beyond_symlink(const char *path, const char *prefix)
  96 {
  97         if (has_symlink_leading_path(path, strlen(path))) {
  98                 int len = prefix ? strlen(prefix) : 0;
  99                 die(_("'%s' is beyond a symbolic link"), path + len);
 100         }
 101 }