git.ozlabs.org Git - petitboot/blob - discover/kboot-parser.c

   1 #define _GNU_SOURCE
   2
   3 #include <assert.h>
   4 #include <stdlib.h>
   5 #include <string.h>
   6
   7 #include "log/log.h"
   8 #include "talloc/talloc.h"
   9 #include "types/types.h"
  10 #include "parser-conf.h"
  11 #include "parser-utils.h"
  12 #include "resource.h"
  13
  14 static void kboot_process_pair(struct conf_context *conf, const char *name,
  15                 char *value)
  16 {
  17         const char *const *ignored_names = conf->parser_info;
  18         struct discover_boot_option *d_opt;
  19         struct boot_option *opt;
  20         char *pos;
  21         char *args;
  22         const char *initrd;
  23         const char *root;
  24
  25         /* ignore bare values */
  26
  27         if (!name)
  28                 return;
  29
  30         if (conf_param_in_list(ignored_names, name))
  31                 return;
  32
  33         if (conf_set_global_option(conf, name, value))
  34                 return;
  35
  36         /* opt must be associated with dc */
  37
  38         d_opt = talloc_zero(conf->dc, struct discover_boot_option);
  39         d_opt->device = conf->dc->device;
  40         opt = talloc_zero(d_opt, struct boot_option);
  41
  42         if (!opt)
  43                 return;
  44
  45         opt->id = talloc_asprintf(opt, "%s#%s", conf->dc->device->device->id,
  46                         name);
  47         opt->name = talloc_strdup(opt, name);
  48         d_opt->option = opt;
  49
  50         args = talloc_strdup(opt, "");
  51         initrd = conf_get_global_option(conf, "initrd");
  52         root = conf_get_global_option(conf, "root");
  53
  54         pos = strchr(value, ' ');
  55
  56         /* if there's no space, it's only a kernel image with no params */
  57
  58         if (!pos)
  59                 goto out_add;
  60         *pos = 0;
  61
  62         for (pos++; pos;) {
  63                 char *cl_name, *cl_value;
  64
  65                 pos = conf_get_pair_equal(conf, pos, &cl_name, &cl_value, ' ');
  66
  67                 if (!cl_name) {
  68                         args = talloc_asprintf_append(args, "%s ", cl_value);
  69                         continue;
  70                 }
  71
  72                 if (streq(cl_name, "initrd")) {
  73                         initrd = cl_value;
  74                         continue;
  75                 }
  76
  77                 if (streq(cl_name, "root")) {
  78                         root = cl_value;
  79                         continue;
  80                 }
  81
  82                 args = talloc_asprintf_append(args, "%s=%s ", cl_name,
  83                         cl_value);
  84         }
  85
  86 out_add:
  87         d_opt->boot_image = create_devpath_resource(d_opt,
  88                                 conf->dc->device, value);
  89
  90         if (root) {
  91                 opt->boot_args = talloc_asprintf(opt, "root=%s %s", root, args);
  92                 talloc_free(args);
  93         } else
  94                 opt->boot_args = args;
  95
  96         if (initrd) {
  97                 d_opt->initrd = create_devpath_resource(d_opt,
  98                                 conf->dc->device, initrd);
  99
 100                 opt->description = talloc_asprintf(opt, "%s initrd=%s %s",
 101                         value, initrd, opt->boot_args);
 102         } else
 103                 opt->description = talloc_asprintf(opt, "%s %s", value,
 104                         opt->boot_args);
 105
 106         conf_strip_str(opt->boot_args);
 107         conf_strip_str(opt->description);
 108
 109         discover_context_add_boot_option(conf->dc, d_opt);
 110 }
 111
 112 static struct conf_global_option kboot_global_options[] = {
 113         { .name = "initrd" },
 114         { .name = "root" },
 115         { .name = "video" },
 116         { .name = NULL }
 117 };
 118
 119 static const char *const kboot_conf_files[] = {
 120         "/kboot.conf",
 121         "/kboot.cnf",
 122         "/etc/kboot.conf",
 123         "/etc/kboot.cnf",
 124         "/KBOOT.CONF",
 125         "/KBOOT.CNF",
 126         "/ETC/KBOOT.CONF",
 127         "/ETC/KBOOT.CNF",
 128         NULL
 129 };
 130
 131 static const char *const kboot_ignored_names[] = {
 132         "default",
 133         "delay",
 134         "message",
 135         "timeout",
 136         NULL
 137 };
 138
 139 static int kboot_parse(struct discover_context *dc, char *buf, int len)
 140 {
 141         struct conf_context *conf;
 142
 143         conf = talloc_zero(dc, struct conf_context);
 144
 145         if (!conf)
 146                 return 0;
 147
 148         conf->dc = dc;
 149         conf->global_options = kboot_global_options,
 150         conf_init_global_options(conf);
 151         conf->get_pair = conf_get_pair_equal;
 152         conf->process_pair = kboot_process_pair;
 153         conf->parser_info = (void *)kboot_ignored_names,
 154
 155         conf_parse_buf(conf, buf, len);
 156
 157         talloc_free(conf);
 158         return 1;
 159 }
 160
 161 static struct parser kboot_parser = {
 162         .name                   = "kboot",
 163         .method                 = CONF_METHOD_LOCAL_FILE,
 164         .parse                  = kboot_parse,
 165         .filenames              = kboot_conf_files,
 166         .resolve_resource       = resolve_devpath_resource,
 167 };
 168
 169 register_parser(kboot_parser);