diplodocus.org Git - nmh/blob - sbr/context_read.c

   1 /* context_read.c -- find and read profile and context files
   2  *
   3  * This code is Copyright (c) 2002, by the authors of nmh.  See the
   4  * COPYRIGHT file in the root directory of the nmh distribution for
   5  * complete copyright information.
   6  *
   7  *      This function must be called early on in any nmh utility, and
   8  *      may only be called once.  It does the following:
   9  *
  10  *       o  Sets the global variable "mypath" to the home directory path.
  11  *
  12  *       o  Sets the global variable "defpath" to the absolute path of
  13  *          the profile file.
  14  *
  15  *       o  Reads in the profile file.  Bails out if it can't.
  16  *
  17  *       o  Makes sure that the mail directory exists, prompting for
  18  *          creation if it doesn't.
  19  *
  20  *       o  Reads the context file either as set by the MHCONTEXT
  21  *          environment variable or by the profile.
  22  */
  23
  24 #include <h/mh.h>                               /* mh internals */
  25 #include <pwd.h>                                /* structure for getpwuid() results */
  26
  27 void
  28 context_read (void)
  29 {
  30     char                        buf[BUFSIZ];    /* path name buffer */
  31     char                        *cp;            /* miscellaneous pointer */
  32     char                        *nd;            /* nmh directory pointer */
  33     struct      stat            st;             /* stat() results */
  34     struct      passwd          *pw;            /* getpwuid() results */
  35     FILE                        *ib;            /* profile and context file pointer */
  36     int failed_to_lock = 0;
  37
  38     /*
  39      *  If this routine _is_ called again (despite the warnings in the
  40      *  comments above), return immediately.
  41      */
  42     if ( m_defs != 0 )
  43         return;
  44
  45     /*
  46      *  Find user's home directory.  Try the HOME environment variable first,
  47      *  the home directory field in the password file if that's not found.
  48      */
  49
  50     if ((mypath = getenv("HOME")) == NULL) {
  51         if ((pw = getpwuid(getuid())) == NULL || *pw->pw_dir == '\0')
  52             adios(NULL, "cannot determine your home directory");
  53         else
  54             mypath = pw->pw_dir;
  55     }
  56
  57     /*
  58      *  Find and read user's profile.  Check for the existence of an MH environment
  59      *  variable first with non-empty contents.  Convert any relative path name
  60      *  found there to an absolute one.  Look for the profile in the user's home
  61      *  directory if the MH environment variable isn't set.
  62      */
  63
  64     if ((cp = getenv("MH")) && *cp != '\0') {
  65         defpath = path(cp, TFILE);
  66
  67         /* defpath is an absolute path; make sure that always MH is, too. */
  68         setenv("MH", defpath, 1);
  69         if (stat(defpath, &st) != -1 && (st.st_mode & S_IFREG) == 0)
  70                 adios(NULL, "`%s' specified by your MH environment variable is not a normal file", cp);
  71
  72         if ((ib = fopen(defpath, "r")) == NULL)
  73             adios(NULL, "unable to read the `%s' profile specified by your MH environment variable", defpath);
  74     }
  75     else {
  76         defpath = concat(mypath, "/", mh_profile, NULL);
  77
  78         if ((ib = fopen(defpath, "r")) == NULL)
  79             adios(NULL, "Doesn't look like nmh is installed.  Run install-mh to do so.");
  80
  81         cp = mh_profile;
  82     }
  83
  84     readconfig (&m_defs, ib, cp, 0);
  85     fclose (ib);
  86
  87     /*
  88      *  Find the user's nmh directory, which is specified by the "path" profile component.
  89      *  Convert a relative path name to an absolute one rooted in the home directory.
  90      */
  91
  92     if ((cp = context_find ("path")) == NULL)
  93         adios(NULL, "Your %s file does not contain a path entry.", defpath);
  94
  95     if (*cp == '\0')
  96         adios(NULL, "Your `%s' profile file does not contain a valid path entry.", defpath);
  97
  98     if (*cp != '/')
  99         (void)snprintf (nd = buf, sizeof(buf), "%s/%s", mypath, cp);
 100     else
 101         nd = cp;
 102
 103     if (stat(nd, &st) == -1) {
 104         if (errno != ENOENT)
 105             adios (nd, "error opening");
 106
 107         cp = concat ("Your MH-directory \"", nd, "\" doesn't exist; Create it? ", NULL);
 108
 109         if (!read_yes_or_no_if_tty(cp))
 110             adios (NULL, "unable to access MH-directory \"%s\"", nd);
 111
 112         free (cp);
 113
 114         if (!makedir (nd))
 115             adios (NULL, "unable to create %s", nd);
 116     }
 117
 118     else if ((st.st_mode & S_IFDIR) == 0)
 119         adios (NULL, "`%s' is not a directory", nd);
 120
 121     /*
 122      *  Open and read user's context file.  The name of the context file comes from the
 123      *  profile unless overridden by the MHCONTEXT environment variable.
 124      */
 125
 126     if ((cp = getenv ("MHCONTEXT")) == NULL || *cp == '\0')
 127         cp = context;
 128
 129     /* context is NULL if context_foil() was called to disable use of context
 130      * We also support users setting explicitly setting MHCONTEXT to /dev/null.
 131      * (if this wasn't special-cased then the locking would be liable to fail)
 132      */
 133     if (!cp || (strcmp(cp,"/dev/null") == 0)) {
 134         ctxpath = NULL;
 135         return;
 136     }
 137
 138     ctxpath = getcpy (m_maildir (cp));
 139
 140     if ((ib = lkfopendata (ctxpath, "r", &failed_to_lock))) {
 141         readconfig ((struct node **) 0, ib, cp, 1);
 142         lkfclosedata (ib, ctxpath);
 143     }
 144 }