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

   1 /*
   2  * context_read.c -- find and read profile and context files
   3  *
   4  * $Id$
   5  *
   6  * This code is Copyright (c) 2002, by the authors of nmh.  See the
   7  * COPYRIGHT file in the root directory of the nmh distribution for
   8  * complete copyright information.
   9  *
  10  *      This function must be called early on in any nmh utility, and
  11  *      may only be called once.  It does the following:
  12  *
  13  *       o  Sets the global variable "mypath" to the home directory path.
  14  *
  15  *       o  Sets the global variable "defpath" to the absolute path of
  16  *          the profile file.
  17  *
  18  *       o  Reads in the profile file.  Bails out if it can't.
  19  *
  20  *       o  Makes sure that the mail directory exists, prompting for
  21  *          creation if it doesn't.
  22  *
  23  *       o  Reads the context file either as set by the MHCONTEXT
  24  *          environment variable or by the profile.
  25  */
  26
  27 #include <h/mh.h>                               /* mh internals */
  28 #include <errno.h>                              /* system call errors */
  29 #include <pwd.h>                                /* structure for getpwuid() results */
  30
  31 void
  32 context_read (void)
  33 {
  34     char                        buf[BUFSIZ];    /* path name buffer */
  35     char                        *cp;            /* miscellaneous pointer */
  36     char                        *nd;            /* nmh directory pointer */
  37     struct      stat            st;             /* stat() results */
  38     register    struct  passwd  *pw;            /* getpwuid() results */
  39     register    FILE            *ib;            /* profile and context file pointer */
  40
  41     /*
  42      *  If this routine _is_ called again (despite the wanings in the
  43      *  comments above), return immediately.
  44      */
  45     if ( m_defs != 0 )
  46         return;
  47
  48     /*
  49      *  Find user's home directory.  Try the HOME environment variable first,
  50      *  the home directory field in the password file if that's not found.
  51      */
  52
  53     if ((mypath = getenv("HOME")) == (char *)0) {
  54         if ((pw = getpwuid(getuid())) == (struct passwd *)0 || *pw->pw_dir == '\0')
  55             adios(NULL, "cannot determine your home directory");
  56         else
  57             mypath = pw->pw_dir;
  58     }
  59
  60     /*
  61      *  Find and read user's profile.  Check for the existence of an MH environment
  62      *  variable first with non-empty contents.  Convert any relative path name
  63      *  found there to an absolute one.  Look for the profile in the user's home
  64      *  directory if the MH environment variable isn't set.
  65      */
  66
  67     if ((cp = getenv("MH")) && *cp != '\0') {
  68         defpath = path(cp, TFILE);
  69
  70         if (stat(defpath, &st) != -1 && (st.st_mode & S_IFREG) == 0)
  71                 adios((char *)0, "`%s' specified by your MH environment variable is not a normal file", cp);
  72
  73         if ((ib = fopen(defpath, "r")) == (FILE *)0)
  74             adios((char *)0, "unable to read the `%s' profile specified by your MH environment variable", defpath);
  75     }
  76     else {
  77         defpath = concat(mypath, "/", mh_profile, NULL);
  78
  79         if ((ib = fopen(defpath, "r")) == (FILE *)0)
  80             adios((char *)0, "Doesn't look like nmh is installed.  Run install-mh to do so.");
  81
  82         cp = mh_profile;
  83     }
  84
  85     readconfig (&m_defs, ib, cp, 0);
  86     fclose (ib);
  87
  88     /*
  89      *  Find the user's nmh directory, which is specified by the "path" profile component.
  90      *  Convert a relative path name to an absolute one rooted in the home directory.
  91      */
  92
  93     if ((cp = context_find ("path")) == (char *)0)
  94         adios(NULL, "Your %s file does not contain a path entry.", defpath);
  95
  96     if (*cp == '\0')
  97         adios(NULL, "Your `%s' profile file does not contain a valid path entry.", defpath);
  98
  99     if (*cp != '/')
 100         (void)snprintf (nd = buf, sizeof(buf), "%s/%s", mypath, cp);
 101     else
 102         nd = cp;
 103
 104     if (stat(nd, &st) == -1) {
 105         if (errno != ENOENT)
 106             adios (nd, "error opening");
 107
 108         cp = concat ("Your MH-directory \"", nd, "\" doesn't exist; Create it? ", NULL);
 109
 110         if (!getanswer(cp))
 111             adios (NULL, "unable to access MH-directory \"%s\"", nd);
 112
 113         free (cp);
 114
 115         if (!makedir (nd))
 116             adios (NULL, "unable to create %s", nd);
 117     }
 118
 119     else if ((st.st_mode & S_IFDIR) == 0)
 120         adios ((char *)0, "`%s' is not a directory", nd);
 121
 122     /*
 123      *  Open and read user's context file.  The name of the context file comes from the
 124      *  profile unless overridden by the MHCONTEXT environment variable.
 125      */
 126
 127     if ((cp = getenv ("MHCONTEXT")) == (char *)0 || *cp == '\0')
 128         cp = context;
 129
 130     /* context is NULL if context_foil() was called to disable use of context
 131      * We also support users setting explicitly setting MHCONTEXT to /dev/null.
 132      * (if this wasn't specialcased then the locking would be liable to fail)
 133      */
 134     if (!cp || (strcmp(cp,"/dev/null") == 0)) {
 135         ctxpath = NULL;
 136         return;
 137     }
 138
 139     ctxpath = getcpy (m_maildir (cp));
 140
 141     if ((ib = lkfopen (ctxpath, "r"))) {
 142         readconfig ((struct node **) 0, ib, cp, 1);
 143         lkfclose (ib, ctxpath);
 144     }
 145
 146     return;
 147 }