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         char* args_sigfile_default = talloc_asprintf(d_opt,
 100                 "%s.cmdline.sig", value);
 101         d_opt->args_sig_file = create_devpath_resource(d_opt,
 102                                 conf->dc->device, args_sigfile_default);
 103         talloc_free(args_sigfile_default);
 104
 105         if (root) {
 106                 opt->boot_args = talloc_asprintf(opt, "root=%s %s", root, args);
 107                 talloc_free(args);
 108         } else
 109                 opt->boot_args = args;
 110
 111         opt->description = talloc_asprintf(opt, "%s %s", value,
 112                         opt->boot_args);
 113
 114         if (initrd) {
 115                 d_opt->initrd = create_devpath_resource(d_opt,
 116                                 conf->dc->device, initrd);
 117                 opt->description = talloc_asprintf_append(opt->description,
 118                                 " initrd=%s", initrd);
 119         }
 120
 121         if (dtb) {
 122                 d_opt->dtb = create_devpath_resource(d_opt,
 123                                 conf->dc->device, dtb);
 124                 opt->description = talloc_asprintf_append(opt->description,
 125                                 " dtb=%s", dtb);
 126         }
 127
 128         conf_strip_str(opt->boot_args);
 129         conf_strip_str(opt->description);
 130
 131         discover_context_add_boot_option(conf->dc, d_opt);
 132 }
 133
 134 static struct conf_global_option kboot_global_options[] = {
 135         { .name = "dtb" },
 136         { .name = "initrd" },
 137         { .name = "root" },
 138         { .name = "video" },
 139         { .name = NULL }
 140 };
 141
 142 static const char *const kboot_conf_files[] = {
 143         "/kboot.conf",
 144         "/kboot.cnf",
 145         "/etc/kboot.conf",
 146         "/etc/kboot.cnf",
 147         "/KBOOT.CONF",
 148         "/KBOOT.CNF",
 149         "/ETC/KBOOT.CONF",
 150         "/ETC/KBOOT.CNF",
 151         NULL
 152 };
 153
 154 static const char *const kboot_ignored_names[] = {
 155         "default",
 156         "delay",
 157         "message",
 158         "timeout",
 159         NULL
 160 };
 161
 162 static int kboot_parse(struct discover_context *dc)
 163 {
 164         struct conf_context *conf;
 165         const char * const *filename;
 166         char *buf;
 167         int len, rc;
 168
 169         /* Support block device boot only at present */
 170         if (dc->event)
 171                 return -1;
 172
 173         conf = talloc_zero(dc, struct conf_context);
 174
 175         if (!conf)
 176                 return -1;
 177
 178         conf->dc = dc;
 179         conf->global_options = kboot_global_options,
 180         conf_init_global_options(conf);
 181         conf->get_pair = conf_get_pair_equal;
 182         conf->process_pair = kboot_process_pair;
 183         conf->parser_info = (void *)kboot_ignored_names;
 184
 185         for (filename = kboot_conf_files; *filename; filename++) {
 186                 rc = parser_request_file(dc, dc->device, *filename, &buf, &len);
 187                 if (rc)
 188                         continue;
 189
 190                 conf_parse_buf(conf, buf, len);
 191                 talloc_free(buf);
 192         }
 193
 194         talloc_free(conf);
 195         return 0;
 196 }
 197
 198 static struct parser kboot_parser = {
 199         .name                   = "kboot",
 200         .parse                  = kboot_parse,
 201         .resolve_resource       = resolve_devpath_resource,
 202 };
 203
 204 register_parser(kboot_parser);