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