discover: kexec harder
[petitboot] / discover / boot.c
index ddb9e7dc367539343e09cb28d321388c5fecb452..29aefa916a8e149b973c69baccbb52b6a6bef799 100644 (file)
 
+#include <assert.h>
+
+#include <log/log.h>
+#include <pb-protocol/pb-protocol.h>
+#include <system/system.h>
+#include <talloc/talloc.h>
+#include <url/url.h>
+
+#include "device-handler.h"
 #include "boot.h"
+#include "paths.h"
+#include "resource.h"
+
+/**
+ * kexec_load - kexec load helper.
+ * @l_image: The local image file for kexec to execute.
+ * @l_initrd: Optional local initrd file for kexec --initrd, can be NULL.
+ * @args: Optional command line args for kexec --append, can be NULL.
+ */
+
+static int kexec_load(const char *l_image, const char *l_initrd,
+       const char *args, int dry_run)
+{
+       int result;
+       const char *argv[6];
+       const char **p;
+       char *s_initrd = NULL;
+       char *s_args = NULL;
+
+       p = argv;
+       *p++ = pb_system_apps.kexec;    /* 1 */
+       *p++ = "-l";                    /* 2 */
+
+       if (l_initrd) {
+               s_initrd = talloc_asprintf(NULL, "--initrd=%s", l_initrd);
+               assert(s_initrd);
+               *p++ = s_initrd;         /* 3 */
+       }
+
+       if (args) {
+               s_args = talloc_asprintf(NULL, "--append=%s", args);
+               assert(s_args);
+               *p++ = s_args;          /* 4 */
+       }
+
+       *p++ = l_image;                 /* 5 */
+       *p++ = NULL;                    /* 6 */
+
+       result = pb_run_cmd(argv, 1, dry_run);
+
+       if (result)
+               pb_log("%s: failed: (%d)\n", __func__, result);
+
+       talloc_free(s_initrd);
+       talloc_free(s_args);
+
+       return result;
+}
+
+/**
+ * kexec_reboot - Helper to boot the new kernel.
+ *
+ * Must only be called after a successful call to kexec_load().
+ */
+
+static int kexec_reboot(int dry_run)
+{
+       int result = 0;
+       const char *argv[4];
+       const char **p;
+
+       /* First try running shutdown.  Init scripts should run 'exec -e' */
+
+       p = argv;
+       *p++ = pb_system_apps.shutdown; /* 1 */
+       *p++ =  "-r";                   /* 2 */
+       *p++ =  "now";                  /* 3 */
+       *p++ =  NULL;                   /* 4 */
+
+       result = pb_run_cmd(argv, 1, dry_run);
+
+       /* On error, force a kexec with the -e option */
+
+       if (result) {
+               p = argv;
+               *p++ = pb_system_apps.kexec;    /* 1 */
+               *p++ = "-e";                    /* 2 */
+               *p++ = NULL;                    /* 3 */
+
+               result = pb_run_cmd(argv, 1, 0);
+       }
+
+       if (result)
+               pb_log("%s: failed: (%d)\n", __func__, result);
+
+       /* okay, kexec -e -f */
+       if (result) {
+               p = argv;
+               *p++ = pb_system_apps.kexec;    /* 1 */
+               *p++ = "-e";                    /* 2 */
+               *p++ = "-f";                    /* 3 */
+               *p++ = NULL;                    /* 4 */
 
-int boot(void *ctx, struct boot_option *opt, struct boot_command *cmd,
-               int dry_run)
+               result = pb_run_cmd(argv, 1, 0);
+       }
+
+       if (result)
+               pb_log("%s: failed: (%d)\n", __func__, result);
+
+
+       return result;
+}
+
+static void update_status(boot_status_fn fn, void *arg, int type,
+               char *message)
 {
-       /* todo: run kexec with options from opt & cmd */
-       (void)ctx;
-       (void)opt;
-       (void)cmd;
-       (void)dry_run;
+       struct boot_status status;
+
+       status.type = type;
+       status.message = message;
+       status.progress = -1;
+       status.detail = NULL;
+
+       fn(arg, &status);
+}
+
+int boot(void *ctx, struct discover_boot_option *opt, struct boot_command *cmd,
+               int dry_run, boot_status_fn status_fn, void *status_arg)
+{
+       char *local_image, *local_initrd;
+       unsigned int clean_image = 0;
+       unsigned int clean_initrd = 0;
+       struct pb_url *image, *initrd;
+       char *args;
+       int result;
+
+       local_initrd = NULL;
+       image = NULL;
+       initrd = NULL;
+       args = NULL;
+
+       if (cmd->boot_image_file) {
+               image = pb_url_parse(opt, cmd->boot_image_file);
+       } else if (opt && opt->boot_image) {
+               image = opt->boot_image->url;
+       } else {
+               pb_log("%s: no image specified", __func__);
+               return -1;
+       }
+
+       if (cmd->initrd_file) {
+               initrd = pb_url_parse(opt, cmd->initrd_file);
+       } else if (opt && opt->initrd) {
+               initrd = opt->initrd->url;
+       }
+
+       if (cmd->boot_args) {
+               args = talloc_strdup(ctx, cmd->boot_args);
+       } else if (opt && opt->option->boot_args) {
+               args = talloc_strdup(ctx, opt->option->boot_args);
+       }
+
+       result = -1;
+
+       update_status(status_fn, status_arg, BOOT_STATUS_INFO,
+                       "loading kernel");
+       local_image = load_url(NULL, image, &clean_image);
+       if (!local_image) {
+               update_status(status_fn, status_arg, BOOT_STATUS_ERROR,
+                               "Couldn't load kernel image");
+               goto no_load;
+       }
+
+       if (initrd) {
+               update_status(status_fn, status_arg, BOOT_STATUS_INFO,
+                               "loading initrd");
+               local_initrd = load_url(NULL, initrd, &clean_initrd);
+               if (!local_initrd) {
+                       update_status(status_fn, status_arg, BOOT_STATUS_ERROR,
+                                       "Couldn't load initrd image");
+                       goto no_load;
+               }
+       }
+
+       update_status(status_fn, status_arg, BOOT_STATUS_INFO,
+                       "performing kexec_load");
+
+       result = kexec_load(local_image, local_initrd, args, dry_run);
+
+       if (result) {
+               update_status(status_fn, status_arg, BOOT_STATUS_ERROR,
+                               "kexec load failed");
+       }
+
+no_load:
+       if (clean_image)
+               unlink(local_image);
+       if (clean_initrd)
+               unlink(local_initrd);
+
+       talloc_free(local_image);
+       talloc_free(local_initrd);
+
+       if (!result) {
+               update_status(status_fn, status_arg, BOOT_STATUS_INFO,
+                               "performing kexec reboot");
+
+               result = kexec_reboot(dry_run);
+
+               if (result) {
+                       update_status(status_fn, status_arg, BOOT_STATUS_ERROR,
+                                       "kexec reboot failed");
+               }
+       }
 
-       return 0;
+       return result;
 }