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 "lock_file.h"
  26 #include "m_maildir.h"
  27 #include "makedir.h"
  28 #include <pwd.h>                                /* structure for getpwuid() results */
  29 #include "h/utils.h"
  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     struct      passwd          *pw;            /* getpwuid() results */
  39     FILE                        *ib;            /* profile and context file pointer */
  40     int failed_to_lock = 0;
  41
  42     /*
  43      *  If this routine _is_ called again (despite the warnings in the
  44      *  comments above), return immediately.
  45      */
  46     if ( m_defs != 0 )
  47         return;
  48
  49     /*
  50      *  Find user's home directory.  Try the HOME environment variable first,
  51      *  the home directory field in the password file if that's not found.
  52      */
  53
  54     if ((mypath = getenv("HOME")) == NULL) {
  55         if ((pw = getpwuid(getuid())) == NULL || *pw->pw_dir == '\0')
  56             die("cannot determine your home directory");
  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         /* defpath is an absolute path; make sure that always MH is, too. */
  71         setenv("MH", defpath, 1);
  72         if (stat(defpath, &st) != -1 && (st.st_mode & S_IFREG) == 0)
  73                 die("`%s' specified by your MH environment variable is not a normal file", cp);
  74
  75         if ((ib = fopen(defpath, "r")) == NULL)
  76             die("unable to read the `%s' profile specified by your MH environment variable", defpath);
  77     }
  78     else {
  79         defpath = concat(mypath, "/", mh_profile, NULL);
  80
  81         if ((ib = fopen(defpath, "r")) == NULL)
  82             die("Doesn't look like nmh is installed.  Run install-mh to do so.");
  83
  84         cp = mh_profile;
  85     }
  86
  87     readconfig (&m_defs, ib, cp, 0);
  88     fclose (ib);
  89
  90     /*
  91      *  Find the user's nmh directory, which is specified by the "path" profile component.
  92      *  Convert a relative path name to an absolute one rooted in the home directory.
  93      */
  94
  95     if ((cp = context_find ("path")) == NULL)
  96         die("Your %s file does not contain a path entry.", defpath);
  97
  98     if (*cp == '\0')
  99         die("Your `%s' profile file does not contain a valid path entry.", defpath);
 100
 101     if (*cp != '/')
 102         (void)snprintf (nd = buf, sizeof(buf), "%s/%s", mypath, cp);
 103     else
 104         nd = cp;
 105
 106     if (stat(nd, &st) == -1) {
 107         if (errno != ENOENT)
 108             adios (nd, "error opening");
 109
 110         cp = concat ("Your MH-directory \"", nd, "\" doesn't exist; Create it? ", NULL);
 111
 112         if (!read_yes_or_no_if_tty(cp))
 113             die("unable to access MH-directory \"%s\"", nd);
 114
 115         free (cp);
 116
 117         if (!makedir (nd))
 118             die("unable to create %s", nd);
 119     }
 120
 121     else if ((st.st_mode & S_IFDIR) == 0)
 122         die("`%s' is not a directory", nd);
 123
 124     /*
 125      *  Open and read user's context file.  The name of the context file comes from the
 126      *  profile unless overridden by the MHCONTEXT environment variable.
 127      */
 128
 129     if ((cp = getenv ("MHCONTEXT")) == NULL || *cp == '\0')
 130         cp = context;
 131
 132     /* context is NULL if context_foil() was called to disable use of context
 133      * We also support users setting explicitly setting MHCONTEXT to /dev/null.
 134      * (if this wasn't special-cased then the locking would be liable to fail)
 135      */
 136     if (!cp || (strcmp(cp,"/dev/null") == 0)) {
 137         ctxpath = NULL;
 138         return;
 139     }
 140
 141     ctxpath = mh_xstrdup(m_maildir(cp));
 142
 143     if ((ib = lkfopendata (ctxpath, "r", &failed_to_lock))) {
 144         readconfig(NULL, ib, cp, 1);
 145         lkfclosedata (ib, ctxpath);
 146     }
 147 }