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

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