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     int failed_to_lock = 0;
  38
  39     /*
  40      *  If this routine _is_ called again (despite the wanings in the
  41      *  comments above), return immediately.
  42      */
  43     if ( m_defs != 0 )
  44         return;
  45
  46     /*
  47      *  Find user's home directory.  Try the HOME environment variable first,
  48      *  the home directory field in the password file if that's not found.
  49      */
  50
  51     if ((mypath = getenv("HOME")) == (char *)0) {
  52         if ((pw = getpwuid(getuid())) == (struct passwd *)0 || *pw->pw_dir == '\0')
  53             adios(NULL, "cannot determine your home directory");
  54         else
  55             mypath = pw->pw_dir;
  56     }
  57
  58     /*
  59      *  Find and read user's profile.  Check for the existence of an MH environment
  60      *  variable first with non-empty contents.  Convert any relative path name
  61      *  found there to an absolute one.  Look for the profile in the user's home
  62      *  directory if the MH environment variable isn't set.
  63      */
  64
  65     if ((cp = getenv("MH")) && *cp != '\0') {
  66         defpath = path(cp, TFILE);
  67
  68         if (stat(defpath, &st) != -1 && (st.st_mode & S_IFREG) == 0)
  69                 adios((char *)0, "`%s' specified by your MH environment variable is not a normal file", cp);
  70
  71         if ((ib = fopen(defpath, "r")) == (FILE *)0)
  72             adios((char *)0, "unable to read the `%s' profile specified by your MH environment variable", defpath);
  73     }
  74     else {
  75         defpath = concat(mypath, "/", mh_profile, NULL);
  76
  77         if ((ib = fopen(defpath, "r")) == (FILE *)0)
  78             adios((char *)0, "Doesn't look like nmh is installed.  Run install-mh to do so.");
  79
  80         cp = mh_profile;
  81     }
  82
  83     readconfig (&m_defs, ib, cp, 0);
  84     fclose (ib);
  85
  86     /*
  87      *  Find the user's nmh directory, which is specified by the "path" profile component.
  88      *  Convert a relative path name to an absolute one rooted in the home directory.
  89      */
  90
  91     if ((cp = context_find ("path")) == (char *)0)
  92         adios(NULL, "Your %s file does not contain a path entry.", defpath);
  93
  94     if (*cp == '\0')
  95         adios(NULL, "Your `%s' profile file does not contain a valid path entry.", defpath);
  96
  97     if (*cp != '/')
  98         (void)snprintf (nd = buf, sizeof(buf), "%s/%s", mypath, cp);
  99     else
 100         nd = cp;
 101
 102     if (stat(nd, &st) == -1) {
 103         if (errno != ENOENT)
 104             adios (nd, "error opening");
 105
 106         cp = concat ("Your MH-directory \"", nd, "\" doesn't exist; Create it? ", NULL);
 107
 108         if (!getanswer(cp))
 109             adios (NULL, "unable to access MH-directory \"%s\"", nd);
 110
 111         free (cp);
 112
 113         if (!makedir (nd))
 114             adios (NULL, "unable to create %s", nd);
 115     }
 116
 117     else if ((st.st_mode & S_IFDIR) == 0)
 118         adios ((char *)0, "`%s' is not a directory", nd);
 119
 120     /*
 121      *  Open and read user's context file.  The name of the context file comes from the
 122      *  profile unless overridden by the MHCONTEXT environment variable.
 123      */
 124
 125     if ((cp = getenv ("MHCONTEXT")) == (char *)0 || *cp == '\0')
 126         cp = context;
 127
 128     /* context is NULL if context_foil() was called to disable use of context
 129      * We also support users setting explicitly setting MHCONTEXT to /dev/null.
 130      * (if this wasn't specialcased then the locking would be liable to fail)
 131      */
 132     if (!cp || (strcmp(cp,"/dev/null") == 0)) {
 133         ctxpath = NULL;
 134         return;
 135     }
 136
 137     ctxpath = getcpy (m_maildir (cp));
 138
 139     if ((ib = lkfopendata (ctxpath, "r", &failed_to_lock))) {
 140         readconfig ((struct node **) 0, ib, cp, 1);
 141         lkfclosedata (ib, ctxpath);
 142     }
 143
 144     return;
 145 }