lib: consolidate util macros in util/util.h
[petitboot] / discover / boot.c
index 2f381a7d0e069619120ccc234a4f2f33ba1effae..13dfe0c9781fc5be889e48e34340cbb4e952aecd 100644 (file)
@@ -15,6 +15,7 @@
 #include <system/system.h>
 #include <talloc/talloc.h>
 #include <url/url.h>
+#include <util/util.h>
 
 #include "device-handler.h"
 #include "boot.h"
@@ -27,26 +28,15 @@ enum {
        BOOT_HOOK_EXIT_UPDATE   = 2,
 };
 
-enum boot_process_state {
-       BOOT_STATE_INITIAL,
-       BOOT_STATE_IMAGE_LOADING,
-       BOOT_STATE_INITRD_LOADING,
-       BOOT_STATE_DTB_LOADING,
-       BOOT_STATE_FINISH,
-       BOOT_STATE_UNKNOWN,
-};
-
-
 struct boot_task {
        struct load_url_result *image;
        struct load_url_result *initrd;
        struct load_url_result *dtb;
        const char *args;
-       struct pb_url *image_url, *initrd_url, *dtb_url;
        boot_status_fn status_fn;
        void *status_arg;
-       enum boot_process_state state;
        bool dry_run;
+       bool cancelled;
 };
 
 /**
@@ -147,6 +137,8 @@ static void __attribute__((format(__printf__, 4, 5))) update_status(
        status.progress = -1;
        status.detail = NULL;
 
+       pb_debug("boot status: [%d] %s\n", type, status.message);
+
        fn(arg, &status);
 
        talloc_free(status.message);
@@ -288,6 +280,25 @@ static void run_boot_hooks(struct boot_task *task)
        free(hooks);
 }
 
+static bool load_pending(struct load_url_result *result)
+{
+       return result && result->status == LOAD_ASYNC;
+}
+
+static int check_load(struct boot_task *task, const char *name,
+               struct load_url_result *result)
+{
+       if (!result)
+               return 0;
+       if (result->status != LOAD_ERROR)
+               return 0;
+
+       update_status(task->status_fn, task->status_arg,
+                       BOOT_STATUS_ERROR,
+                       "Couldn't load %s", name);
+       return -1;
+}
+
 static void cleanup_load(struct load_url_result *result)
 {
        if (!result)
@@ -299,90 +310,59 @@ static void cleanup_load(struct load_url_result *result)
        unlink(result->local);
 }
 
-static void boot_process(struct load_url_result *result, void *data)
+static void cleanup_cancellations(struct boot_task *task,
+               struct load_url_result *cur_result)
 {
-       struct boot_task *task = data;
-       int rc = -1;
+       struct load_url_result *result, **results[] = {
+               &task->image, &task->initrd, &task->dtb,
+       };
+       bool pending = false;
+       unsigned int i;
 
-       if (task->state == BOOT_STATE_INITIAL) {
-               update_status(task->status_fn, task->status_arg,
-                               BOOT_STATUS_INFO, "loading kernel");
-               task->image = load_url_async(task, task->image_url,
-                                               boot_process, task);
-               if (!task->image) {
-                       update_status(task->status_fn, task->status_arg,
-                                       BOOT_STATUS_ERROR,
-                                       "Couldn't load kernel image");
-                       goto no_load;
-               }
-               task->state = BOOT_STATE_IMAGE_LOADING;
-               return;
-       }
+       for (i = 0; i < ARRAY_SIZE(results); i++) {
+               result = *results[i];
 
-       if (task->state == BOOT_STATE_IMAGE_LOADING) {
-               if (result->status == LOAD_ERROR) {
-                       update_status(task->status_fn, task->status_arg,
-                                       BOOT_STATUS_ERROR,
-                                       "Error loading kernel image");
-                       goto no_load;
-               }
-               task->state = BOOT_STATE_INITRD_LOADING;
+               if (!result)
+                       continue;
 
-               if (task->initrd_url) {
-                       update_status(task->status_fn, task->status_arg,
-                                       BOOT_STATUS_INFO, "loading initrd");
-                       task->initrd = load_url_async(task, task->initrd_url,
-                                                       boot_process, task);
-                       if (!task->initrd) {
-                               update_status(task->status_fn, task->status_arg,
-                                               BOOT_STATUS_ERROR,
-                                               "Couldn't load initrd image");
-                               goto no_load;
-                       }
-                       return;
+               /* We need to cleanup and free any completed loads */
+               if (result == cur_result || result->status == LOAD_OK
+                               || result->status == LOAD_ERROR) {
+                       cleanup_load(result);
+                       talloc_free(result);
+                       *results[i] = NULL;
+
+               /* ... and cancel any pending loads, which we'll free in
+                * the completion callback */
+               } else if (result->status == LOAD_ASYNC) {
+                       load_url_async_cancel(result);
+                       pending = true;
                }
        }
 
-       if (task->state == BOOT_STATE_INITRD_LOADING) {
-               if (result->status) {
-                       update_status(task->status_fn, task->status_arg,
-                                       BOOT_STATUS_ERROR,
-                                       "Error loading initrd");
-                       goto no_load;
-               }
-               task->state = BOOT_STATE_DTB_LOADING;
+       if (!pending)
+               talloc_free(task);
+}
 
-               if (task->dtb_url) {
-                       update_status(task->status_fn, task->status_arg,
-                                       BOOT_STATUS_INFO,
-                                       "loading device tree");
-                       task->dtb = load_url_async(task, task->dtb_url,
-                                                       boot_process, task);
-                       if (!task->dtb) {
-                               update_status(task->status_fn, task->status_arg,
-                                               BOOT_STATUS_ERROR,
-                                               "Couldn't load device tree");
-                               goto no_load;
-                       }
-                       return;
-               }
-       }
+static void boot_process(struct load_url_result *result, void *data)
+{
+       struct boot_task *task = data;
+       int rc = -1;
 
-       if (task->state == BOOT_STATE_DTB_LOADING) {
-               if (result->status) {
-                       update_status(task->status_fn, task->status_arg,
-                                       BOOT_STATUS_ERROR,
-                                       "Error loading dtb");
-                       goto no_load;
-               }
-               task->state = BOOT_STATE_FINISH;
+       if (task->cancelled) {
+               cleanup_cancellations(task, result);
+               return;
        }
 
-
-       if (task->state != BOOT_STATE_FINISH) {
-               task->state = BOOT_STATE_UNKNOWN;
+       if (load_pending(task->image) ||
+                       load_pending(task->initrd) ||
+                       load_pending(task->dtb))
                return;
-       }
+
+       if (check_load(task, "kernel image", task->image) ||
+                       check_load(task, "initrd", task->initrd) ||
+                       check_load(task, "dtb", task->dtb))
+               goto no_load;
 
        run_boot_hooks(task);
 
@@ -412,16 +392,32 @@ no_load:
                                        "kexec reboot failed");
                }
        }
+}
 
-       talloc_free(task);
+static int start_url_load(struct boot_task *task, const char *name,
+               struct pb_url *url, struct load_url_result **result)
+{
+       if (!url)
+               return 0;
+
+       *result = load_url_async(task, url, boot_process, task);
+       if (!*result) {
+               update_status(task->status_fn, task->status_arg,
+                               BOOT_STATUS_ERROR,
+                               "Error loading %s", name);
+               return -1;
+       }
+       return 0;
 }
 
-int boot(void *ctx, struct discover_boot_option *opt, struct boot_command *cmd,
-               int dry_run, boot_status_fn status_fn, void *status_arg)
+struct boot_task *boot(void *ctx, struct discover_boot_option *opt,
+               struct boot_command *cmd, int dry_run,
+               boot_status_fn status_fn, void *status_arg)
 {
+       struct pb_url *image = NULL, *initrd = NULL, *dtb = NULL;
        struct boot_task *boot_task;
-       struct pb_url *image = NULL;
        const char *boot_desc;
+       int rc;
 
        if (opt && opt->option->name)
                boot_desc = opt->option->name;
@@ -441,28 +437,26 @@ int boot(void *ctx, struct discover_boot_option *opt, struct boot_command *cmd,
                pb_log("%s: no image specified\n", __func__);
                update_status(status_fn, status_arg, BOOT_STATUS_INFO,
                                "Boot failed: no image specified");
-               return -1;
+               return NULL;
        }
 
-       boot_task = talloc_zero(ctx, struct boot_task);
-       boot_task->image_url = image;
-       boot_task->dry_run = dry_run;
-       boot_task->status_fn = status_fn;
-       boot_task->status_arg = status_arg;
-       boot_task->state = BOOT_STATE_INITIAL;
-
        if (cmd && cmd->initrd_file) {
-               boot_task->initrd_url = pb_url_parse(opt, cmd->initrd_file);
+               initrd = pb_url_parse(opt, cmd->initrd_file);
        } else if (opt && opt->initrd) {
-               boot_task->initrd_url = opt->initrd->url;
+               initrd = opt->initrd->url;
        }
 
        if (cmd && cmd->dtb_file) {
-               boot_task->dtb_url = pb_url_parse(opt, cmd->dtb_file);
+               dtb = pb_url_parse(opt, cmd->dtb_file);
        } else if (opt && opt->dtb) {
-               boot_task->dtb_url = opt->dtb->url;
+               dtb = opt->dtb->url;
        }
 
+       boot_task = talloc_zero(ctx, struct boot_task);
+       boot_task->dry_run = dry_run;
+       boot_task->status_fn = status_fn;
+       boot_task->status_arg = status_arg;
+
        if (cmd && cmd->boot_args) {
                boot_task->args = talloc_strdup(boot_task, cmd->boot_args);
        } else if (opt && opt->option->boot_args) {
@@ -472,7 +466,28 @@ int boot(void *ctx, struct discover_boot_option *opt, struct boot_command *cmd,
                boot_task->args = NULL;
        }
 
+       /* start async loads for boot resources */
+       rc = start_url_load(boot_task, "kernel image", image, &boot_task->image)
+         || start_url_load(boot_task, "initrd", initrd, &boot_task->initrd)
+         || start_url_load(boot_task, "dtb", dtb, &boot_task->dtb);
+
+       /* If all URLs are local, we may be done. */
+       if (rc) {
+               talloc_free(boot_task);
+               return NULL;
+       }
+
        boot_process(NULL, boot_task);
 
-       return 0;
+       return boot_task;
+}
+
+void boot_cancel(struct boot_task *task)
+{
+       task->cancelled = true;
+
+       update_status(task->status_fn, task->status_arg, BOOT_STATUS_INFO,
+                       "Boot cancelled");
+
+       cleanup_cancellations(task, NULL);
 }