contrib/cvs-1.12/src/repos.c

   1 /*
   2  * Copyright (C) 1986-2005 The Free Software Foundation, Inc.
   3  *
   4  * Portions Copyright (C) 1998-2005 Derek Price, Ximbiot <http://ximbiot.com>,
   5  *                                  and others.
   6  *
   7  * Portions Copyright (C) 1992, Brian Berliner and Jeff Polk
   8  * Portions Copyright (C) 1989-1992, Brian Berliner
   9  *
  10  * You may distribute under the terms of the GNU General Public License as
  11  * specified in the README file that comes with the CVS source distribution.
  12  */
  13
  14 #include "cvs.h"
  15 #include "getline.h"
  16
  17
  18
  19 /* Determine the name of the RCS repository for directory DIR in the
  20    current working directory, or for the current working directory
  21    itself if DIR is NULL.  Returns the name in a newly-malloc'd
  22    string.  On error, gives a fatal error and does not return.
  23    UPDATE_DIR is the path from where cvs was invoked (for use in error
  24    messages), and should contain DIR as its last component.
  25    UPDATE_DIR can be NULL to signify the directory in which cvs was
  26    invoked.  */
  27
  28 char *
  29 Name_Repository (const char *dir, const char *update_dir)
  30 {
  31     FILE *fpin;
  32     const char *xupdate_dir;
  33     char *repos = NULL;
  34     size_t repos_allocated = 0;
  35     char *tmp;
  36     char *cp;
  37
  38     if (update_dir && *update_dir)
  39         xupdate_dir = update_dir;
  40     else
  41         xupdate_dir = ".";
  42
  43     if (dir != NULL)
  44         tmp = Xasprintf ("%s/%s", dir, CVSADM_REP);
  45     else
  46         tmp = xstrdup (CVSADM_REP);
  47
  48     /*
  49      * The assumption here is that the repository is always contained in the
  50      * first line of the "Repository" file.
  51      */
  52     fpin = CVS_FOPEN (tmp, "r");
  53
  54     if (fpin == NULL)
  55     {
  56         int save_errno = errno;
  57         char *cvsadm;
  58
  59         if (dir != NULL)
  60             cvsadm = Xasprintf ("%s/%s", dir, CVSADM);
  61         else
  62             cvsadm = xstrdup (CVSADM);
  63
  64         if (!isdir (cvsadm))
  65         {
  66             error (0, 0, "in directory `%s':", xupdate_dir);
  67             error (1, 0, "there is no version here; do `%s checkout' first",
  68                    program_name);
  69         }
  70         free (cvsadm);
  71
  72         if (existence_error (save_errno))
  73         {
  74             /* This occurs at least in the case where the user manually
  75              * creates a directory named CVS.
  76              */
  77             error (0, 0, "in directory `%s':", xupdate_dir);
  78             error (0, 0, "CVS directory found without administrative files.");
  79             error (0, 0, "Use CVS to create the CVS directory, or rename the");
  80             error (0, 0, "directory if it is intended to store something");
  81             error (0, 0, "besides CVS administrative files.");
  82             error (1, 0, "*PANIC* administration files missing!");
  83         }
  84
  85         error (1, save_errno, "cannot open `%s'", tmp);
  86     }
  87
  88     if (getline (&repos, &repos_allocated, fpin) < 0)
  89     {
  90         /* FIXME: should be checking for end of file separately.  */
  91         error (0, 0, "in directory `%s':", xupdate_dir);
  92         error (1, errno, "cannot read `%s'", CVSADM_REP);
  93     }
  94     if (fclose (fpin) < 0)
  95         error (0, errno, "cannot close `%s'", tmp);
  96     free (tmp);
  97
  98     if ((cp = strrchr (repos, '\n')) != NULL)
  99         *cp = '\0';                     /* strip the newline */
 100
 101     /* If this is a relative repository pathname, turn it into an absolute
 102      * one by tacking on the current root.  There is no need to grab it from
 103      * the CVS/Root file via the Name_Root() function because by the time
 104      * this function is called, we the contents of CVS/Root have already been
 105      * compared to original_root and found to match.
 106      */
 107     if (!ISABSOLUTE (repos))
 108     {
 109         char *newrepos;
 110
 111         if (current_parsed_root == NULL)
 112         {
 113             error (0, 0, "in directory `%s:", xupdate_dir);
 114             error (0, 0, "must set the CVSROOT environment variable\n");
 115             error (0, 0, "or specify the '-d' option to `%s'.", program_name);
 116             error (1, 0, "invalid repository setting");
 117         }
 118         if (pathname_levels (repos) > 0)
 119         {
 120             error (0, 0, "in directory `%s':", xupdate_dir);
 121             error (0, 0, "`..'-relative repositories are not supported.");
 122             error (1, 0, "invalid source repository");
 123         }
 124         newrepos = Xasprintf ("%s/%s", original_parsed_root->directory, repos);
 125         free (repos);
 126         repos = newrepos;
 127     }
 128
 129     Sanitize_Repository_Name (repos);
 130
 131     return repos;
 132 }
 133
 134
 135
 136 /*
 137  * Return a pointer to the repository name relative to CVSROOT from a
 138  * possibly fully qualified repository
 139  */
 140 const char *
 141 Short_Repository (const char *repository)
 142 {
 143     if (repository == NULL)
 144         return NULL;
 145
 146     /* If repository matches CVSroot at the beginning, strip off CVSroot */
 147     /* And skip leading '/' in rep, in case CVSroot ended with '/'. */
 148     if (strncmp (original_parsed_root->directory, repository,
 149                  strlen (original_parsed_root->directory)) == 0)
 150     {
 151         const char *rep = repository + strlen (original_parsed_root->directory);
 152         return (*rep == '/') ? rep+1 : rep;
 153     }
 154     else
 155         return repository;
 156 }
 157
 158
 159
 160 /* Sanitize the repository name (in place) by removing trailing
 161  * slashes and a trailing "." if present.  It should be safe for
 162  * callers to use strcat and friends to create repository names.
 163  * Without this check, names like "/path/to/repos/./foo" and
 164  * "/path/to/repos//foo" would be created.  For example, one
 165  * significant case is the CVSROOT-detection code in commit.c.  It
 166  * decides whether or not it needs to rebuild the administrative file
 167  * database by doing a string compare.  If we've done a `cvs co .' to
 168  * get the CVSROOT files, "/path/to/repos/./CVSROOT" and
 169  * "/path/to/repos/CVSROOT" are the arguments that are compared!
 170  *
 171  * This function ends up being called from the same places as
 172  * strip_path, though what it does is much more conservative.  Many
 173  * comments about this operation (which was scattered around in
 174  * several places in the source code) ran thus:
 175  *
 176  *    ``repository ends with "/."; omit it.  This sort of thing used
 177  *    to be taken care of by strip_path.  Now we try to be more
 178  *    selective.  I suspect that it would be even better to push it
 179  *    back further someday, so that the trailing "/." doesn't get into
 180  *    repository in the first place, but we haven't taken things that
 181  *    far yet.''        --Jim Kingdon (recurse.c, 07-Sep-97)
 182  */
 183
 184 void
 185 Sanitize_Repository_Name (char *repository)
 186 {
 187     size_t len;
 188
 189     assert (repository != NULL);
 190
 191     strip_trailing_slashes (repository);
 192
 193     len = strlen (repository);
 194     if (len >= 2
 195         && repository[len - 1] == '.'
 196         && ISSLASH (repository[len - 2]))
 197     {
 198         repository[len - 2] = '\0';
 199     }
 200 }