git.ozlabs.org Git - petitboot/blob - discover/boot.c

   1
   2 #define _GNU_SOURCE
   3
   4 #include <stdbool.h>
   5 #include <stdlib.h>
   6 #include <assert.h>
   7 #include <dirent.h>
   8 #include <string.h>
   9 #include <fcntl.h>
  10 #include <sys/types.h>
  11
  12 #include <log/log.h>
  13 #include <pb-protocol/pb-protocol.h>
  14 #include <process/process.h>
  15 #include <system/system.h>
  16 #include <talloc/talloc.h>
  17 #include <url/url.h>
  18
  19 #include "device-handler.h"
  20 #include "boot.h"
  21 #include "paths.h"
  22 #include "resource.h"
  23
  24 static const char *boot_hook_dir = PKG_SYSCONF_DIR "/boot.d";
  25 enum {
  26         BOOT_HOOK_EXIT_OK       = 0,
  27         BOOT_HOOK_EXIT_UPDATE   = 2,
  28 };
  29
  30
  31 struct boot_task {
  32         char *local_image;
  33         char *local_initrd;
  34         char *local_dtb;
  35         char *args;
  36
  37         bool dry_run;
  38 };
  39
  40 /**
  41  * kexec_load - kexec load helper.
  42  */
  43 static int kexec_load(struct boot_task *boot_task)
  44 {
  45         int result;
  46         const char *argv[7];
  47         const char **p;
  48         char *s_initrd = NULL;
  49         char *s_dtb = NULL;
  50         char *s_args = NULL;
  51
  52         p = argv;
  53         *p++ = pb_system_apps.kexec;    /* 1 */
  54         *p++ = "-l";                    /* 2 */
  55
  56         if (boot_task->local_initrd) {
  57                 s_initrd = talloc_asprintf(boot_task, "--initrd=%s",
  58                                 boot_task->local_initrd);
  59                 assert(s_initrd);
  60                 *p++ = s_initrd;         /* 3 */
  61         }
  62
  63         if (boot_task->local_dtb) {
  64                 s_dtb = talloc_asprintf(boot_task, "--dtb=%s",
  65                                                 boot_task->local_dtb);
  66                 assert(s_dtb);
  67                 *p++ = s_dtb;            /* 4 */
  68         }
  69
  70         if (boot_task->args) {
  71                 s_args = talloc_asprintf(boot_task, "--append=%s",
  72                                                 boot_task->args);
  73                 assert(s_args);
  74                 *p++ = s_args;          /* 5 */
  75         }
  76
  77         *p++ = boot_task->local_image;  /* 6 */
  78         *p++ = NULL;                    /* 7 */
  79
  80         result = pb_run_cmd(argv, 1, boot_task->dry_run);
  81
  82         if (result)
  83                 pb_log("%s: failed: (%d)\n", __func__, result);
  84
  85         return result;
  86 }
  87
  88 /**
  89  * kexec_reboot - Helper to boot the new kernel.
  90  *
  91  * Must only be called after a successful call to kexec_load().
  92  */
  93
  94 static int kexec_reboot(bool dry_run)
  95 {
  96         int result = 0;
  97         const char *argv[4];
  98         const char **p;
  99
 100         /* First try running shutdown.  Init scripts should run 'exec -e' */
 101
 102         p = argv;
 103         *p++ = pb_system_apps.shutdown; /* 1 */
 104         *p++ =  "-r";                   /* 2 */
 105         *p++ =  "now";                  /* 3 */
 106         *p++ =  NULL;                   /* 4 */
 107
 108         result = pb_run_cmd(argv, 1, dry_run);
 109
 110         /* On error, force a kexec with the -e option */
 111
 112         if (result) {
 113                 p = argv;
 114                 *p++ = pb_system_apps.kexec;    /* 1 */
 115                 *p++ = "-e";                    /* 2 */
 116                 *p++ = NULL;                    /* 3 */
 117
 118                 result = pb_run_cmd(argv, 1, 0);
 119         }
 120
 121         if (result)
 122                 pb_log("%s: failed: (%d)\n", __func__, result);
 123
 124         /* okay, kexec -e -f */
 125         if (result) {
 126                 p = argv;
 127                 *p++ = pb_system_apps.kexec;    /* 1 */
 128                 *p++ = "-e";                    /* 2 */
 129                 *p++ = "-f";                    /* 3 */
 130                 *p++ = NULL;                    /* 4 */
 131
 132                 result = pb_run_cmd(argv, 1, 0);
 133         }
 134
 135         if (result)
 136                 pb_log("%s: failed: (%d)\n", __func__, result);
 137
 138
 139         return result;
 140 }
 141
 142 static void update_status(boot_status_fn fn, void *arg, int type,
 143                 char *message)
 144 {
 145         struct boot_status status;
 146
 147         status.type = type;
 148         status.message = message;
 149         status.progress = -1;
 150         status.detail = NULL;
 151
 152         fn(arg, &status);
 153 }
 154
 155 static void boot_hook_update_param(void *ctx, struct boot_task *task,
 156                 const char *name, const char *value)
 157 {
 158         struct p {
 159                 const char *name;
 160                 char **p;
 161         } *param, params[] = {
 162                 { "boot_image",         &task->local_image },
 163                 { "boot_initrd",        &task->local_initrd },
 164                 { "boot_dtb",           &task->local_dtb },
 165                 { "boot_args",          &task->args },
 166                 { NULL, NULL },
 167         };
 168
 169         for (param = params; param->name; param++) {
 170                 if (strcmp(param->name, name))
 171                         continue;
 172
 173                 *param->p = talloc_strdup(ctx, value);
 174                 return;
 175         }
 176 }
 177
 178 static void boot_hook_update(struct boot_task *task, const char *hookname,
 179                 char *buf)
 180 {
 181         char *line, *name, *val, *sep;
 182         char *saveptr;
 183
 184         for (;; buf = NULL) {
 185
 186                 line = strtok_r(buf, "\n", &saveptr);
 187                 if (!line)
 188                         break;
 189
 190                 sep = strchr(line, '=');
 191                 if (!sep)
 192                         continue;
 193
 194                 *sep = '\0';
 195                 name = line;
 196                 val = sep + 1;
 197
 198                 boot_hook_update_param(task, task, name, val);
 199
 200                 pb_log("boot hook %s specified %s=%s\n",
 201                                 hookname, name, val);
 202         }
 203 }
 204
 205 static void boot_hook_setenv(struct boot_task *task)
 206 {
 207         unsetenv("boot_image");
 208         unsetenv("boot_initrd");
 209         unsetenv("boot_dtb");
 210         unsetenv("boot_args");
 211
 212         setenv("boot_image", task->local_image, 1);
 213         if (task->local_initrd)
 214                 setenv("boot_initrd", task->local_initrd, 1);
 215         if (task->local_dtb)
 216                 setenv("boot_dtb", task->local_dtb, 1);
 217         if (task->args)
 218                 setenv("boot_args", task->args, 1);
 219 }
 220
 221 static int hook_filter(const struct dirent *dirent)
 222 {
 223         return dirent->d_type == DT_REG || dirent->d_type == DT_LNK;
 224 }
 225
 226 static int hook_cmp(const struct dirent **a, const struct dirent **b)
 227 {
 228         return strcmp((*a)->d_name, (*b)->d_name);
 229 }
 230
 231 static void run_boot_hooks(struct boot_task *task, boot_status_fn status_fn,
 232                 void *status_arg)
 233 {
 234         struct dirent **hooks;
 235         int i, n;
 236
 237         n = scandir(boot_hook_dir, &hooks, hook_filter, hook_cmp);
 238         if (n < 1)
 239                 return;
 240
 241         update_status(status_fn, status_arg, BOOT_STATUS_INFO,
 242                         "running boot hooks");
 243
 244         boot_hook_setenv(task);
 245
 246         for (i = 0; i < n; i++) {
 247                 const char *argv[2] = { NULL, NULL };
 248                 struct process *process;
 249                 char *path;
 250                 int rc;
 251
 252                 path = join_paths(task, boot_hook_dir, hooks[i]->d_name);
 253
 254                 if (access(path, X_OK)) {
 255                         talloc_free(path);
 256                         continue;
 257                 }
 258
 259                 process = process_create(task);
 260
 261                 argv[0] = path;
 262                 process->path = path;
 263                 process->argv = argv;
 264                 process->keep_stdout = true;
 265
 266                 pb_log("running boot hook %s\n", hooks[i]->d_name);
 267
 268                 rc = process_run_sync(process);
 269                 if (rc) {
 270                         pb_log("boot hook exec failed!\n");
 271
 272                 } else if (WIFEXITED(process->exit_status) &&
 273                            WEXITSTATUS(process->exit_status)
 274                                 == BOOT_HOOK_EXIT_UPDATE) {
 275                         /* if the hook returned with BOOT_HOOK_EXIT_UPDATE,
 276                          * then we process stdout to look for updated params
 277                          */
 278                         if (rc == BOOT_HOOK_EXIT_UPDATE) {
 279                                 boot_hook_update(task, hooks[i]->d_name,
 280                                                 process->stdout_buf);
 281                                 boot_hook_setenv(task);
 282                         }
 283                 }
 284
 285                 process_release(process);
 286                 talloc_free(path);
 287         }
 288
 289         free(hooks);
 290 }
 291
 292 int boot(void *ctx, struct discover_boot_option *opt, struct boot_command *cmd,
 293                 int dry_run, boot_status_fn status_fn, void *status_arg)
 294 {
 295         struct boot_task *boot_task;
 296         struct pb_url *image, *initrd, *dtb;
 297         unsigned int clean_image = 0;
 298         unsigned int clean_initrd = 0;
 299         unsigned int clean_dtb = 0;
 300         int result;
 301
 302         image = NULL;
 303         initrd = NULL;
 304         dtb = NULL;
 305
 306         if (cmd && cmd->boot_image_file) {
 307                 image = pb_url_parse(opt, cmd->boot_image_file);
 308         } else if (opt && opt->boot_image) {
 309                 image = opt->boot_image->url;
 310         } else {
 311                 pb_log("%s: no image specified", __func__);
 312                 return -1;
 313         }
 314
 315         boot_task = talloc_zero(ctx, struct boot_task);
 316         boot_task->dry_run = dry_run;
 317
 318         if (cmd && cmd->initrd_file) {
 319                 initrd = pb_url_parse(opt, cmd->initrd_file);
 320         } else if (opt && opt->initrd) {
 321                 initrd = opt->initrd->url;
 322         }
 323
 324         if (cmd && cmd->dtb_file) {
 325                 dtb = pb_url_parse(opt, cmd->dtb_file);
 326         } else if (opt && opt->dtb) {
 327                 dtb = opt->dtb->url;
 328         }
 329
 330         if (cmd && cmd->boot_args) {
 331                 boot_task->args = talloc_strdup(boot_task, cmd->boot_args);
 332         } else if (opt && opt->option->boot_args) {
 333                 boot_task->args = talloc_strdup(boot_task,
 334                                                 opt->option->boot_args);
 335         } else {
 336                 boot_task->args = NULL;
 337         }
 338
 339         result = -1;
 340
 341         update_status(status_fn, status_arg, BOOT_STATUS_INFO,
 342                         "loading kernel");
 343         boot_task->local_image = load_url(NULL, image, &clean_image);
 344         if (!boot_task->local_image) {
 345                 update_status(status_fn, status_arg, BOOT_STATUS_ERROR,
 346                                 "Couldn't load kernel image");
 347                 goto no_load;
 348         }
 349
 350         if (initrd) {
 351                 update_status(status_fn, status_arg, BOOT_STATUS_INFO,
 352                                 "loading initrd");
 353                 boot_task->local_initrd = load_url(NULL, initrd, &clean_initrd);
 354                 if (!boot_task->local_initrd) {
 355                         update_status(status_fn, status_arg, BOOT_STATUS_ERROR,
 356                                         "Couldn't load initrd image");
 357                         goto no_load;
 358                 }
 359         }
 360
 361         if (dtb) {
 362                 update_status(status_fn, status_arg, BOOT_STATUS_INFO,
 363                                 "loading device tree");
 364                 boot_task->local_dtb = load_url(NULL, dtb, &clean_dtb);
 365                 if (!boot_task->local_dtb) {
 366                         update_status(status_fn, status_arg, BOOT_STATUS_ERROR,
 367                                         "Couldn't load device tree");
 368                         goto no_load;
 369                 }
 370         }
 371
 372         run_boot_hooks(boot_task, status_fn, status_arg);
 373
 374         update_status(status_fn, status_arg, BOOT_STATUS_INFO,
 375                         "performing kexec_load");
 376
 377         result = kexec_load(boot_task);
 378
 379         if (result) {
 380                 update_status(status_fn, status_arg, BOOT_STATUS_ERROR,
 381                                 "kexec load failed");
 382         }
 383
 384 no_load:
 385         if (clean_image)
 386                 unlink(boot_task->local_image);
 387         if (clean_initrd)
 388                 unlink(boot_task->local_initrd);
 389         if (clean_dtb)
 390                 unlink(boot_task->local_dtb);
 391
 392         talloc_free(boot_task);
 393
 394         if (!result) {
 395                 update_status(status_fn, status_arg, BOOT_STATUS_INFO,
 396                                 "performing kexec reboot");
 397
 398                 result = kexec_reboot(boot_task->dry_run);
 399
 400                 if (result) {
 401                         update_status(status_fn, status_arg, BOOT_STATUS_ERROR,
 402                                         "kexec reboot failed");
 403                 }
 404         }
 405
 406         return result;
 407 }