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