Move boot to discover server

[petitboot] / discover / boot.c

diff --git a/discover/boot.c b/discover/boot.c
index ddb9e7dc367539343e09cb28d321388c5fecb452..6109562491db79855655a4bf8431e07c20bd1e0f 100644 (file)
--- a/discover/boot.c
+++ b/discover/boot.c
@@ -1,14 +1,159 @@
 
 

+#include <assert.h>
+
+#include <log/log.h>
+#include <pb-protocol/pb-protocol.h>
+#include <system/system.h>
+#include <talloc/talloc.h>
+

 #include "boot.h"
 #include "boot.h"

+#include "paths.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);
+
+       return result;
+}

 
 int boot(void *ctx, struct boot_option *opt, struct boot_command *cmd,
                int dry_run)
 {
 
 int boot(void *ctx, struct boot_option *opt, struct boot_command *cmd,
                int dry_run)
 {

-       /* todo: run kexec with options from opt & cmd */
-       (void)ctx;
-       (void)opt;
-       (void)cmd;
-       (void)dry_run;
+       char *local_image, *local_initrd;
+       unsigned int clean_image = 0;
+       unsigned int clean_initrd = 0;
+       char *image, *initrd, *args;
+       int result;
+
+       image = NULL;
+       initrd = NULL;
+       args = NULL;
+
+       if (cmd->boot_image_file) {
+               image = talloc_strdup(ctx, cmd->boot_image_file);
+       } else if (opt && opt->boot_image_file) {
+               image = talloc_strdup(ctx, opt->boot_image_file);
+       } else {
+               pb_log("%s: no image specified", __func__);
+               return -1;
+       }
+
+       if (cmd->initrd_file) {
+               image = talloc_strdup(ctx, cmd->initrd_file);
+       } else if (opt && opt->initrd_file) {
+               image = talloc_strdup(ctx, opt->initrd_file);
+       }
+
+       if (cmd->boot_args) {
+               args = talloc_strdup(ctx, cmd->boot_args);
+       } else if (opt && opt->boot_args) {
+               args = talloc_strdup(ctx, opt->boot_args);
+       }
+
+       result = -1;
+
+       local_image = load_file(NULL, image, &clean_image);
+       if (!local_image)
+               goto no_load;
+
+       local_initrd = NULL;
+       if (initrd) {
+               local_initrd = load_file(NULL, initrd, &clean_initrd);
+               if (!local_initrd)
+                       goto no_load;
+       }
+
+       result = kexec_load(local_image, local_initrd, args, dry_run);
+
+no_load:
+       if (clean_image)
+               unlink(local_image);
+       if (clean_initrd)
+               unlink(local_initrd);
+
+       talloc_free(local_image);
+       talloc_free(local_initrd);
+
+       if (!result)
+               result = kexec_reboot(dry_run);

 
 

-       return 0;
+       return result;

 }
 }