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 device *dev;
  19         char *pos;
  20         char *args;
  21         const char *initrd;
  22         const char *root;
  23         struct boot_option *opt;
  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         dev = conf->dc->device->device;
  39         opt = talloc_zero(dev, struct boot_option);
  40
  41         if (!opt)
  42                 return;
  43
  44         opt->id = talloc_asprintf(opt, "%s#%s", dev->id, name);
  45         opt->name = talloc_strdup(opt, name);
  46
  47         args = talloc_strdup(opt, "");
  48         initrd = conf_get_global_option(conf, "initrd");
  49         root = conf_get_global_option(conf, "root");
  50
  51         pos = strchr(value, ' ');
  52
  53         /* if there's no space, it's only a kernel image with no params */
  54
  55         if (!pos)
  56                 goto out_add;
  57         *pos = 0;
  58
  59         for (pos++; pos;) {
  60                 char *cl_name, *cl_value;
  61
  62                 pos = conf_get_pair_equal(conf, pos, &cl_name, &cl_value, ' ');
  63
  64                 if (!cl_name) {
  65                         args = talloc_asprintf_append(args, "%s ", cl_value);
  66                         continue;
  67                 }
  68
  69                 if (streq(cl_name, "initrd")) {
  70                         initrd = cl_value;
  71                         continue;
  72                 }
  73
  74                 if (streq(cl_name, "root")) {
  75                         root = cl_value;
  76                         continue;
  77                 }
  78
  79                 args = talloc_asprintf_append(args, "%s=%s ", cl_name,
  80                         cl_value);
  81         }
  82
  83 out_add:
  84         opt->boot_image_file = resolve_path(opt, value,
  85                         conf->dc->device->device_path);
  86
  87         if (root) {
  88                 opt->boot_args = talloc_asprintf(opt, "root=%s %s", root, args);
  89                 talloc_free(args);
  90         } else
  91                 opt->boot_args = args;
  92
  93         if (initrd) {
  94                 opt->initrd_file = resolve_path(opt, initrd,
  95                                 conf->dc->device->device_path);
  96
  97                 opt->description = talloc_asprintf(opt, "%s initrd=%s %s",
  98                         value, initrd, opt->boot_args);
  99         } else
 100                 opt->description = talloc_asprintf(opt, "%s %s", value,
 101                         opt->boot_args);
 102
 103         conf_strip_str(opt->boot_args);
 104         conf_strip_str(opt->description);
 105
 106         discover_context_add_boot_option(conf->dc, opt);
 107 }
 108
 109 static struct conf_global_option kboot_global_options[] = {
 110         { .name = "initrd" },
 111         { .name = "root" },
 112         { .name = "video" },
 113         { .name = NULL }
 114 };
 115
 116 static const char *const kboot_conf_files[] = {
 117         "/kboot.conf",
 118         "/kboot.cnf",
 119         "/etc/kboot.conf",
 120         "/etc/kboot.cnf",
 121         "/KBOOT.CONF",
 122         "/KBOOT.CNF",
 123         "/ETC/KBOOT.CONF",
 124         "/ETC/KBOOT.CNF",
 125         NULL
 126 };
 127
 128 static const char *const kboot_ignored_names[] = {
 129         "default",
 130         "delay",
 131         "message",
 132         "timeout",
 133         NULL
 134 };
 135
 136 static int kboot_parse(struct discover_context *dc, char *buf, int len)
 137 {
 138         struct conf_context *conf;
 139
 140         conf = talloc_zero(dc, struct conf_context);
 141
 142         if (!conf)
 143                 return 0;
 144
 145         conf->dc = dc;
 146         conf->global_options = kboot_global_options,
 147         conf_init_global_options(conf);
 148         conf->get_pair = conf_get_pair_equal;
 149         conf->process_pair = kboot_process_pair;
 150         conf->parser_info = (void *)kboot_ignored_names,
 151
 152         conf_parse_buf(conf, buf, len);
 153
 154         talloc_free(conf);
 155         return 1;
 156 }
 157
 158 struct parser __kboot_parser = {
 159         .name           = "kboot",
 160         .parse          = kboot_parse,
 161         .filenames      = kboot_conf_files,
 162 };