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 "paths.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
  49         args = talloc_strdup(opt, "");
  50         initrd = conf_get_global_option(conf, "initrd");
  51         root = conf_get_global_option(conf, "root");
  52
  53         pos = strchr(value, ' ');
  54
  55         /* if there's no space, it's only a kernel image with no params */
  56
  57         if (!pos)
  58                 goto out_add;
  59         *pos = 0;
  60
  61         for (pos++; pos;) {
  62                 char *cl_name, *cl_value;
  63
  64                 pos = conf_get_pair_equal(conf, pos, &cl_name, &cl_value, ' ');
  65
  66                 if (!cl_name) {
  67                         args = talloc_asprintf_append(args, "%s ", cl_value);
  68                         continue;
  69                 }
  70
  71                 if (streq(cl_name, "initrd")) {
  72                         initrd = cl_value;
  73                         continue;
  74                 }
  75
  76                 if (streq(cl_name, "root")) {
  77                         root = cl_value;
  78                         continue;
  79                 }
  80
  81                 args = talloc_asprintf_append(args, "%s=%s ", cl_name,
  82                         cl_value);
  83         }
  84
  85 out_add:
  86         opt->boot_image_file = resolve_path(opt, value,
  87                         conf->dc->device->device_path);
  88
  89         if (root) {
  90                 opt->boot_args = talloc_asprintf(opt, "root=%s %s", root, args);
  91                 talloc_free(args);
  92         } else
  93                 opt->boot_args = args;
  94
  95         if (initrd) {
  96                 opt->initrd_file = resolve_path(opt, initrd,
  97                                 conf->dc->device->device_path);
  98
  99                 opt->description = talloc_asprintf(opt, "%s initrd=%s %s",
 100                         value, initrd, opt->boot_args);
 101         } else
 102                 opt->description = talloc_asprintf(opt, "%s %s", value,
 103                         opt->boot_args);
 104
 105         conf_strip_str(opt->boot_args);
 106         conf_strip_str(opt->description);
 107
 108         discover_context_add_boot_option(conf->dc, d_opt);
 109 }
 110
 111 static struct conf_global_option kboot_global_options[] = {
 112         { .name = "initrd" },
 113         { .name = "root" },
 114         { .name = "video" },
 115         { .name = NULL }
 116 };
 117
 118 static const char *const kboot_conf_files[] = {
 119         "/kboot.conf",
 120         "/kboot.cnf",
 121         "/etc/kboot.conf",
 122         "/etc/kboot.cnf",
 123         "/KBOOT.CONF",
 124         "/KBOOT.CNF",
 125         "/ETC/KBOOT.CONF",
 126         "/ETC/KBOOT.CNF",
 127         NULL
 128 };
 129
 130 static const char *const kboot_ignored_names[] = {
 131         "default",
 132         "delay",
 133         "message",
 134         "timeout",
 135         NULL
 136 };
 137
 138 static int kboot_parse(struct discover_context *dc, char *buf, int len)
 139 {
 140         struct conf_context *conf;
 141
 142         conf = talloc_zero(dc, struct conf_context);
 143
 144         if (!conf)
 145                 return 0;
 146
 147         conf->dc = dc;
 148         conf->global_options = kboot_global_options,
 149         conf_init_global_options(conf);
 150         conf->get_pair = conf_get_pair_equal;
 151         conf->process_pair = kboot_process_pair;
 152         conf->parser_info = (void *)kboot_ignored_names,
 153
 154         conf_parse_buf(conf, buf, len);
 155
 156         talloc_free(conf);
 157         return 1;
 158 }
 159
 160 struct parser __kboot_parser = {
 161         .name           = "kboot",
 162         .parse          = kboot_parse,
 163         .filenames      = kboot_conf_files,
 164 };