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 "error.h"
  26 #include "lock_file.h"
  27 #include "m_maildir.h"
  28 #include "makedir.h"
  29 #include <pwd.h>                                /* structure for getpwuid() results */
  30 #include "h/utils.h"
  31
  32 void
  33 context_read (void)
  34 {
  35     char                        buf[BUFSIZ];    /* path name buffer */
  36     char                        *cp;            /* miscellaneous pointer */
  37     char                        *nd;            /* nmh directory pointer */
  38     struct      stat            st;             /* stat() results */
  39     struct      passwd          *pw;            /* getpwuid() results */
  40     FILE                        *ib;            /* profile and context file pointer */
  41     int failed_to_lock = 0;
  42
  43     /*
  44      *  If this routine _is_ called again (despite the warnings in the
  45      *  comments above), return immediately.
  46      */
  47     if ( m_defs != 0 )
  48         return;
  49
  50     /*
  51      *  Find user's home directory.  Try the HOME environment variable first,
  52      *  the home directory field in the password file if that's not found.
  53      */
  54
  55     if ((mypath = getenv("HOME")) == NULL) {
  56         if ((pw = getpwuid(getuid())) == NULL || *pw->pw_dir == '\0')
  57             die("cannot determine your home directory");
  58         mypath = pw->pw_dir;
  59     }
  60
  61     /*
  62      *  Find and read user's profile.  Check for the existence of an MH environment
  63      *  variable first with non-empty contents.  Convert any relative path name
  64      *  found there to an absolute one.  Look for the profile in the user's home
  65      *  directory if the MH environment variable isn't set.
  66      */
  67
  68     if ((cp = getenv("MH")) && *cp != '\0') {
  69         defpath = path(cp, TFILE);
  70
  71         /* defpath is an absolute path; make sure that always MH is, too. */
  72         setenv("MH", defpath, 1);
  73         if (stat(defpath, &st) != -1 && (st.st_mode & S_IFREG) == 0)
  74                 die("`%s' specified by your MH environment variable is not a normal file", cp);
  75
  76         if ((ib = fopen(defpath, "r")) == NULL)
  77             die("unable to read the `%s' profile specified by your MH environment variable", defpath);
  78     }
  79     else {
  80         defpath = concat(mypath, "/", mh_profile, NULL);
  81
  82         if ((ib = fopen(defpath, "r")) == NULL)
  83             die("Doesn't look like nmh is installed.  Run install-mh to do so.");
  84
  85         cp = mh_profile;
  86     }
  87
  88     readconfig (&m_defs, ib, cp, 0);
  89     fclose (ib);
  90
  91     /*
  92      *  Find the user's nmh directory, which is specified by the "path" profile component.
  93      *  Convert a relative path name to an absolute one rooted in the home directory.
  94      */
  95
  96     if ((cp = context_find ("path")) == NULL)
  97         die("Your %s file does not contain a path entry.", defpath);
  98
  99     if (*cp == '\0')
 100         die("Your `%s' profile file does not contain a valid path entry.", defpath);
 101
 102     if (*cp != '/')
 103         (void)snprintf (nd = buf, sizeof(buf), "%s/%s", mypath, cp);
 104     else
 105         nd = cp;
 106
 107     if (stat(nd, &st) == -1) {
 108         if (errno != ENOENT)
 109             adios (nd, "error opening");
 110
 111         cp = concat ("Your MH-directory \"", nd, "\" doesn't exist; Create it? ", NULL);
 112
 113         if (!read_yes_or_no_if_tty(cp))
 114             die("unable to access MH-directory \"%s\"", nd);
 115
 116         free (cp);
 117
 118         if (!makedir (nd))
 119             die("unable to create %s", nd);
 120     }
 121
 122     else if ((st.st_mode & S_IFDIR) == 0)
 123         die("`%s' is not a directory", nd);
 124
 125     /*
 126      *  Open and read user's context file.  The name of the context file comes from the
 127      *  profile unless overridden by the MHCONTEXT environment variable.
 128      */
 129
 130     if ((cp = getenv ("MHCONTEXT")) == NULL || *cp == '\0')
 131         cp = context;
 132
 133     /* context is NULL if context_foil() was called to disable use of context
 134      * We also support users setting explicitly setting MHCONTEXT to /dev/null.
 135      * (if this wasn't special-cased then the locking would be liable to fail)
 136      */
 137     if (!cp || (strcmp(cp,"/dev/null") == 0)) {
 138         ctxpath = NULL;
 139         return;
 140     }
 141
 142     ctxpath = mh_xstrdup(m_maildir(cp));
 143
 144     if ((ib = lkfopendata (ctxpath, "r", &failed_to_lock))) {
 145         readconfig(NULL, ib, cp, 1);
 146         lkfclosedata (ib, ctxpath);
 147     }
 148 }