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

   1 #if defined(HAVE_CONFIG_H)
   2 #include "config.h"
   3 #endif
   4
   5 #include <assert.h>
   6 #include <stdlib.h>
   7 #include <string.h>
   8
   9 #include "log/log.h"
  10 #include "talloc/talloc.h"
  11 #include "types/types.h"
  12 #include "parser-conf.h"
  13 #include "parser-utils.h"
  14 #include "resource.h"
  15
  16 static void kboot_process_pair(struct conf_context *conf, const char *name,
  17                 char *value)
  18 {
  19         const char *const *ignored_names = conf->parser_info;
  20         struct discover_boot_option *d_opt;
  21         struct boot_option *opt;
  22         char *pos;
  23         char *args;
  24         const char *initrd;
  25         const char *root;
  26         const char *dtb;
  27
  28         /* ignore bare values */
  29
  30         if (!name)
  31                 return;
  32
  33         if (conf_param_in_list(ignored_names, name))
  34                 return;
  35
  36         if (conf_set_global_option(conf, name, value))
  37                 return;
  38
  39         /* opt must be associated with dc */
  40
  41         d_opt = talloc_zero(conf->dc, struct discover_boot_option);
  42         d_opt->device = conf->dc->device;
  43         opt = talloc_zero(d_opt, struct boot_option);
  44
  45         if (!opt)
  46                 return;
  47
  48         opt->id = talloc_asprintf(opt, "%s#%s", conf->dc->device->device->id,
  49                         name);
  50         opt->name = talloc_strdup(opt, name);
  51         d_opt->option = opt;
  52
  53         args = talloc_strdup(opt, "");
  54         initrd = conf_get_global_option(conf, "initrd");
  55         root = conf_get_global_option(conf, "root");
  56         dtb = conf_get_global_option(conf, "dtb");
  57
  58         pos = strchr(value, ' ');
  59
  60         /* if there's no space, it's only a kernel image with no params */
  61
  62         if (!pos)
  63                 goto out_add;
  64         *pos = 0;
  65
  66         for (pos++; pos;) {
  67                 char *cl_name, *cl_value;
  68
  69                 pos = conf_get_pair_equal(conf, pos, &cl_name, &cl_value, ' ');
  70
  71                 if (!cl_name) {
  72                         args = talloc_asprintf_append(args, "%s ", cl_value);
  73                         continue;
  74                 }
  75
  76                 if (streq(cl_name, "initrd")) {
  77                         initrd = cl_value;
  78                         continue;
  79                 }
  80
  81                 if (streq(cl_name, "root")) {
  82                         root = cl_value;
  83                         continue;
  84                 }
  85
  86                 if (streq(cl_name, "dtb")) {
  87                         dtb = cl_value;
  88                         continue;
  89                 }
  90
  91                 args = talloc_asprintf_append(args, "%s=%s ", cl_name,
  92                         cl_value);
  93         }
  94
  95 out_add:
  96         d_opt->boot_image = create_devpath_resource(d_opt,
  97                                 conf->dc->device, value);
  98
  99         if (root) {
 100                 opt->boot_args = talloc_asprintf(opt, "root=%s %s", root, args);
 101                 talloc_free(args);
 102         } else
 103                 opt->boot_args = args;
 104
 105         opt->description = talloc_asprintf(opt, "%s %s", value,
 106                         opt->boot_args);
 107
 108         if (initrd) {
 109                 d_opt->initrd = create_devpath_resource(d_opt,
 110                                 conf->dc->device, initrd);
 111                 opt->description = talloc_asprintf_append(opt->description,
 112                                 " initrd=%s", initrd);
 113         }
 114
 115         if (dtb) {
 116                 d_opt->dtb = create_devpath_resource(d_opt,
 117                                 conf->dc->device, dtb);
 118                 opt->description = talloc_asprintf_append(opt->description,
 119                                 " dtb=%s", dtb);
 120         }
 121
 122         conf_strip_str(opt->boot_args);
 123         conf_strip_str(opt->description);
 124
 125         discover_context_add_boot_option(conf->dc, d_opt);
 126 }
 127
 128 static struct conf_global_option kboot_global_options[] = {
 129         { .name = "dtb" },
 130         { .name = "initrd" },
 131         { .name = "root" },
 132         { .name = "video" },
 133         { .name = NULL }
 134 };
 135
 136 static const char *const kboot_conf_files[] = {
 137         "/kboot.conf",
 138         "/kboot.cnf",
 139         "/etc/kboot.conf",
 140         "/etc/kboot.cnf",
 141         "/KBOOT.CONF",
 142         "/KBOOT.CNF",
 143         "/ETC/KBOOT.CONF",
 144         "/ETC/KBOOT.CNF",
 145         NULL
 146 };
 147
 148 static const char *const kboot_ignored_names[] = {
 149         "default",
 150         "delay",
 151         "message",
 152         "timeout",
 153         NULL
 154 };
 155
 156 static int kboot_parse(struct discover_context *dc)
 157 {
 158         struct conf_context *conf;
 159         const char * const *filename;
 160         char *buf;
 161         int len, rc;
 162
 163         /* Support block device boot only at present */
 164         if (dc->event)
 165                 return -1;
 166
 167         conf = talloc_zero(dc, struct conf_context);
 168
 169         if (!conf)
 170                 return -1;
 171
 172         conf->dc = dc;
 173         conf->global_options = kboot_global_options,
 174         conf_init_global_options(conf);
 175         conf->get_pair = conf_get_pair_equal;
 176         conf->process_pair = kboot_process_pair;
 177         conf->parser_info = (void *)kboot_ignored_names;
 178
 179         for (filename = kboot_conf_files; *filename; filename++) {
 180                 rc = parser_request_file(dc, dc->device, *filename, &buf, &len);
 181                 if (rc)
 182                         continue;
 183
 184                 conf_parse_buf(conf, buf, len);
 185                 talloc_free(buf);
 186         }
 187
 188         talloc_free(conf);
 189         return 0;
 190 }
 191
 192 static struct parser kboot_parser = {
 193         .name                   = "kboot",
 194         .parse                  = kboot_parse,
 195         .resolve_resource       = resolve_devpath_resource,
 196 };
 197
 198 register_parser(kboot_parser);