ui/ncurses: Use pmenu_item destrutor to free ncurses ITEMs
[petitboot] / discover / boot.c
index 6095cd8d865f8e02cc350b7665371b9771472e50..e5803a76dcf0fbc228f2c426b19c415c28d382ef 100644 (file)
@@ -1,5 +1,7 @@
 
-#define _GNU_SOURCE
+#if defined(HAVE_CONFIG_H)
+#include "config.h"
+#endif
 
 #include <stdbool.h>
 #include <stdlib.h>
@@ -15,6 +17,7 @@
 #include <system/system.h>
 #include <talloc/talloc.h>
 #include <url/url.h>
+#include <util/util.h>
 
 #include "device-handler.h"
 #include "boot.h"
@@ -27,14 +30,18 @@ enum {
        BOOT_HOOK_EXIT_UPDATE   = 2,
 };
 
-
 struct boot_task {
-       char *local_image;
-       char *local_initrd;
-       char *local_dtb;
-       char *args;
-
+       struct load_url_result *image;
+       struct load_url_result *initrd;
+       struct load_url_result *dtb;
+       const char *local_image;
+       const char *local_initrd;
+       const char *local_dtb;
+       const char *args;
+       boot_status_fn status_fn;
+       void *status_arg;
        bool dry_run;
+       bool cancelled;
 };
 
 /**
@@ -135,6 +142,8 @@ 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);
@@ -145,7 +154,7 @@ static void boot_hook_update_param(void *ctx, struct boot_task *task,
 {
        struct p {
                const char *name;
-               char **p;
+               const char **p;
        } *param, params[] = {
                { "boot_image",         &task->local_image },
                { "boot_initrd",        &task->local_initrd },
@@ -216,8 +225,7 @@ static int hook_cmp(const struct dirent **a, const struct dirent **b)
        return strcmp((*a)->d_name, (*b)->d_name);
 }
 
-static void run_boot_hooks(struct boot_task *task, boot_status_fn status_fn,
-               void *status_arg)
+static void run_boot_hooks(struct boot_task *task)
 {
        struct dirent **hooks;
        int i, n;
@@ -226,7 +234,7 @@ static void run_boot_hooks(struct boot_task *task, boot_status_fn status_fn,
        if (n < 1)
                return;
 
-       update_status(status_fn, status_arg, BOOT_STATUS_INFO,
+       update_status(task->status_fn, task->status_arg, BOOT_STATUS_INFO,
                        "running boot hooks");
 
        boot_hook_setenv(task);
@@ -263,11 +271,9 @@ static void run_boot_hooks(struct boot_task *task, boot_status_fn status_fn,
                        /* if the hook returned with BOOT_HOOK_EXIT_UPDATE,
                         * then we process stdout to look for updated params
                         */
-                       if (rc == BOOT_HOOK_EXIT_UPDATE) {
-                               boot_hook_update(task, hooks[i]->d_name,
-                                               process->stdout_buf);
-                               boot_hook_setenv(task);
-                       }
+                       boot_hook_update(task, hooks[i]->d_name,
+                                       process->stdout_buf);
+                       boot_hook_setenv(task);
                }
 
                process_release(process);
@@ -277,19 +283,160 @@ static void run_boot_hooks(struct boot_task *task, boot_status_fn status_fn,
        free(hooks);
 }
 
-int boot(void *ctx, struct discover_boot_option *opt, struct boot_command *cmd,
-               int dry_run, boot_status_fn status_fn, void *status_arg)
+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)
+               return;
+       if (result->status != LOAD_OK)
+               return;
+       if (!result->cleanup_local)
+               return;
+       unlink(result->local);
+}
+
+static void cleanup_cancellations(struct boot_task *task,
+               struct load_url_result *cur_result)
+{
+       struct load_url_result *result, **results[] = {
+               &task->image, &task->initrd, &task->dtb,
+       };
+       bool pending = false;
+       unsigned int i;
+
+       for (i = 0; i < ARRAY_SIZE(results); i++) {
+               result = *results[i];
+
+               if (!result)
+                       continue;
+
+               /* 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 (!pending)
+               talloc_free(task);
+}
+
+static void boot_process(struct load_url_result *result, void *data)
 {
+       struct boot_task *task = data;
+       int rc = -1;
+
+       if (task->cancelled) {
+               cleanup_cancellations(task, result);
+               return;
+       }
+
+       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;
+
+       /* we make a copy of the local paths, as the boot hooks might update
+        * and/or create these */
+       task->local_image = task->image ? task->image->local : NULL;
+       task->local_initrd = task->initrd ? task->initrd->local : NULL;
+       task->local_dtb = task->dtb ? task->dtb->local : NULL;
+
+       run_boot_hooks(task);
+
+       update_status(task->status_fn, task->status_arg, BOOT_STATUS_INFO,
+                       "performing kexec_load");
+
+       rc = kexec_load(task);
+       if (rc) {
+               update_status(task->status_fn, task->status_arg,
+                               BOOT_STATUS_ERROR, "kexec load failed");
+       }
+
+no_load:
+       cleanup_load(task->image);
+       cleanup_load(task->initrd);
+       cleanup_load(task->dtb);
+
+       if (!rc) {
+               update_status(task->status_fn, task->status_arg,
+                               BOOT_STATUS_INFO,
+                               "performing kexec reboot");
+
+               rc = kexec_reboot(task);
+               if (rc) {
+                       update_status(task->status_fn, task->status_arg,
+                                       BOOT_STATUS_ERROR,
+                                       "kexec reboot failed");
+               }
+       }
+}
+
+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;
+}
+
+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, *initrd, *dtb;
-       unsigned int clean_image = 0;
-       unsigned int clean_initrd = 0;
-       unsigned int clean_dtb = 0;
-       int result;
+       const char *boot_desc;
+       int rc;
+
+       if (opt && opt->option->name)
+               boot_desc = opt->option->name;
+       else if (cmd && cmd->boot_image_file)
+               boot_desc = cmd->boot_image_file;
+       else
+               boot_desc = "(unknown)";
 
-       image = NULL;
-       initrd = NULL;
-       dtb = NULL;
+       update_status(status_fn, status_arg, BOOT_STATUS_INFO,
+                       "Booting %s.", boot_desc);
 
        if (cmd && cmd->boot_image_file) {
                image = pb_url_parse(opt, cmd->boot_image_file);
@@ -297,12 +444,11 @@ int boot(void *ctx, struct discover_boot_option *opt, struct boot_command *cmd,
                image = opt->boot_image->url;
        } else {
                pb_log("%s: no image specified\n", __func__);
-               return -1;
+               update_status(status_fn, status_arg, BOOT_STATUS_INFO,
+                               "Boot failed: no image specified");
+               return NULL;
        }
 
-       boot_task = talloc_zero(ctx, struct boot_task);
-       boot_task->dry_run = dry_run;
-
        if (cmd && cmd->initrd_file) {
                initrd = pb_url_parse(opt, cmd->initrd_file);
        } else if (opt && opt->initrd) {
@@ -315,6 +461,11 @@ int boot(void *ctx, struct discover_boot_option *opt, struct boot_command *cmd,
                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) {
@@ -324,72 +475,28 @@ int boot(void *ctx, struct discover_boot_option *opt, struct boot_command *cmd,
                boot_task->args = NULL;
        }
 
-       result = -1;
+       /* 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);
 
-       update_status(status_fn, status_arg, BOOT_STATUS_INFO,
-                       "loading kernel");
-       boot_task->local_image = load_url(NULL, image, &clean_image);
-       if (!boot_task->local_image) {
-               update_status(status_fn, status_arg, BOOT_STATUS_ERROR,
-                               "Couldn't load kernel image");
-               goto no_load;
+       /* If all URLs are local, we may be done. */
+       if (rc) {
+               talloc_free(boot_task);
+               return NULL;
        }
 
-       if (initrd) {
-               update_status(status_fn, status_arg, BOOT_STATUS_INFO,
-                               "loading initrd");
-               boot_task->local_initrd = load_url(NULL, initrd, &clean_initrd);
-               if (!boot_task->local_initrd) {
-                       update_status(status_fn, status_arg, BOOT_STATUS_ERROR,
-                                       "Couldn't load initrd image");
-                       goto no_load;
-               }
-       }
-
-       if (dtb) {
-               update_status(status_fn, status_arg, BOOT_STATUS_INFO,
-                               "loading device tree");
-               boot_task->local_dtb = load_url(NULL, dtb, &clean_dtb);
-               if (!boot_task->local_dtb) {
-                       update_status(status_fn, status_arg, BOOT_STATUS_ERROR,
-                                       "Couldn't load device tree");
-                       goto no_load;
-               }
-       }
-
-       run_boot_hooks(boot_task, status_fn, status_arg);
+       boot_process(NULL, boot_task);
 
-       update_status(status_fn, status_arg, BOOT_STATUS_INFO,
-                       "performing kexec_load");
-
-       result = kexec_load(boot_task);
-
-       if (result) {
-               update_status(status_fn, status_arg, BOOT_STATUS_ERROR,
-                               "kexec load failed");
-       }
-
-no_load:
-       if (clean_image)
-               unlink(boot_task->local_image);
-       if (clean_initrd)
-               unlink(boot_task->local_initrd);
-       if (clean_dtb)
-               unlink(boot_task->local_dtb);
-
-       if (!result) {
-               update_status(status_fn, status_arg, BOOT_STATUS_INFO,
-                               "performing kexec reboot");
-
-               result = kexec_reboot(boot_task);
+       return boot_task;
+}
 
-               if (result) {
-                       update_status(status_fn, status_arg, BOOT_STATUS_ERROR,
-                                       "kexec reboot failed");
-               }
-       }
+void boot_cancel(struct boot_task *task)
+{
+       task->cancelled = true;
 
-       talloc_free(boot_task);
+       update_status(task->status_fn, task->status_arg, BOOT_STATUS_INFO,
+                       "Boot cancelled");
 
-       return result;
+       cleanup_cancellations(task, NULL);
 }