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 #include <i18n/i18n.h>
   9
  10 #include "log/log.h"
  11 #include "talloc/talloc.h"
  12 #include "types/types.h"
  13 #include "parser-conf.h"
  14 #include "parser-utils.h"
  15 #include "resource.h"
  16
  17 static void kboot_process_pair(struct conf_context *conf, const char *name,
  18                 char *value)
  19 {
  20         const char *const *ignored_names = conf->parser_info;
  21         struct discover_boot_option *d_opt;
  22         struct boot_option *opt;
  23         char *pos;
  24         char *args;
  25         const char *initrd;
  26         const char *root;
  27         const char *dtb;
  28
  29         /* ignore bare values */
  30
  31         if (!name)
  32                 return;
  33
  34         if (conf_param_in_list(ignored_names, name))
  35                 return;
  36
  37         if (conf_set_global_option(conf, name, value))
  38                 return;
  39
  40         /* opt must be associated with dc */
  41
  42         d_opt = talloc_zero(conf->dc, struct discover_boot_option);
  43         d_opt->device = conf->dc->device;
  44         opt = talloc_zero(d_opt, struct boot_option);
  45
  46         if (!opt)
  47                 return;
  48
  49         opt->id = talloc_asprintf(opt, "%s#%s", conf->dc->device->device->id,
  50                         name);
  51         opt->name = talloc_strdup(opt, name);
  52         d_opt->option = opt;
  53
  54         args = talloc_strdup(opt, "");
  55         initrd = conf_get_global_option(conf, "initrd");
  56         root = conf_get_global_option(conf, "root");
  57         dtb = conf_get_global_option(conf, "dtb");
  58
  59         pos = strchr(value, ' ');
  60
  61         /* if there's no space, it's only a kernel image with no params */
  62
  63         if (!pos)
  64                 goto out_add;
  65         *pos = 0;
  66
  67         for (pos++; pos;) {
  68                 char *cl_name, *cl_value;
  69
  70                 pos = conf_get_pair_equal(conf, pos, &cl_name, &cl_value, ' ');
  71
  72                 if (!cl_name) {
  73                         args = talloc_asprintf_append(args, "%s ", cl_value);
  74                         continue;
  75                 }
  76
  77                 if (streq(cl_name, "initrd")) {
  78                         initrd = cl_value;
  79                         continue;
  80                 }
  81
  82                 if (streq(cl_name, "root")) {
  83                         root = cl_value;
  84                         continue;
  85                 }
  86
  87                 if (streq(cl_name, "dtb")) {
  88                         dtb = cl_value;
  89                         continue;
  90                 }
  91
  92                 args = talloc_asprintf_append(args, "%s=%s ", cl_name,
  93                         cl_value);
  94         }
  95
  96 out_add:
  97         d_opt->boot_image = create_devpath_resource(d_opt,
  98                                 conf->dc->device, value);
  99
 100         char* args_sigfile_default = talloc_asprintf(d_opt,
 101                 "%s.cmdline.sig", value);
 102         d_opt->args_sig_file = create_devpath_resource(d_opt,
 103                                 conf->dc->device, args_sigfile_default);
 104         talloc_free(args_sigfile_default);
 105
 106         if (root) {
 107                 opt->boot_args = talloc_asprintf(opt, "root=%s %s", root, args);
 108                 talloc_free(args);
 109         } else
 110                 opt->boot_args = args;
 111
 112         opt->description = talloc_asprintf(opt, "%s %s", value,
 113                         opt->boot_args);
 114
 115         if (initrd) {
 116                 d_opt->initrd = create_devpath_resource(d_opt,
 117                                 conf->dc->device, initrd);
 118                 opt->description = talloc_asprintf_append(opt->description,
 119                                 " initrd=%s", initrd);
 120         }
 121
 122         if (dtb) {
 123                 d_opt->dtb = create_devpath_resource(d_opt,
 124                                 conf->dc->device, dtb);
 125                 opt->description = talloc_asprintf_append(opt->description,
 126                                 " dtb=%s", dtb);
 127         }
 128
 129         conf_strip_str(opt->boot_args);
 130         conf_strip_str(opt->description);
 131
 132         discover_context_add_boot_option(conf->dc, d_opt);
 133 }
 134
 135 static struct conf_global_option kboot_global_options[] = {
 136         { .name = "dtb" },
 137         { .name = "initrd" },
 138         { .name = "root" },
 139         { .name = "video" },
 140         { .name = NULL }
 141 };
 142
 143 static const char *const kboot_conf_files[] = {
 144         "/kboot.conf",
 145         "/kboot.cnf",
 146         "/etc/kboot.conf",
 147         "/etc/kboot.cnf",
 148         "/KBOOT.CONF",
 149         "/KBOOT.CNF",
 150         "/ETC/KBOOT.CONF",
 151         "/ETC/KBOOT.CNF",
 152         NULL
 153 };
 154
 155 static const char *const kboot_ignored_names[] = {
 156         "default",
 157         "delay",
 158         "message",
 159         "timeout",
 160         NULL
 161 };
 162
 163 static int kboot_parse(struct discover_context *dc)
 164 {
 165         struct conf_context *conf;
 166         const char * const *filename;
 167         char *buf;
 168         int len, rc;
 169
 170         /* Support block device boot only at present */
 171         if (dc->event)
 172                 return -1;
 173
 174         conf = talloc_zero(dc, struct conf_context);
 175
 176         if (!conf)
 177                 return -1;
 178
 179         conf->dc = dc;
 180         conf->global_options = kboot_global_options,
 181         conf_init_global_options(conf);
 182         conf->get_pair = conf_get_pair_equal;
 183         conf->process_pair = kboot_process_pair;
 184         conf->parser_info = (void *)kboot_ignored_names;
 185
 186         for (filename = kboot_conf_files; *filename; filename++) {
 187                 rc = parser_request_file(dc, dc->device, *filename, &buf, &len);
 188                 if (rc)
 189                         continue;
 190
 191                 conf_parse_buf(conf, buf, len);
 192                 device_handler_status_dev_info(dc->handler, dc->device,
 193                                 _("Parsed kboot configuration from %s"),
 194                                 *filename);
 195                 talloc_free(buf);
 196         }
 197
 198         talloc_free(conf);
 199         return 0;
 200 }
 201
 202 static struct parser kboot_parser = {
 203         .name                   = "kboot",
 204         .parse                  = kboot_parse,
 205         .resolve_resource       = resolve_devpath_resource,
 206 };
 207
 208 register_parser(kboot_parser);