X-Git-Url: https://git.ozlabs.org/?p=petitboot;a=blobdiff_plain;f=discover%2Fboot.c;h=e57810d54d46a10687c0182d9004d63b0349d188;hp=ae44717523f6df24e36674321186b067023cf65e;hb=f9a63d3a640cb30a12598cedc0dd7d8b6fc5b4de;hpb=72332700113065602e3545b7a358a34c102851d8

diff --git a/discover/boot.c b/discover/boot.c
index ae44717..e57810d 100644
--- a/discover/boot.c
+++ b/discover/boot.c
@@ -1,6 +1,13 @@
 
+#define _GNU_SOURCE
+
 #include <stdbool.h>
+#include <stdlib.h>
 #include <assert.h>
+#include <dirent.h>
+#include <string.h>
+#include <fcntl.h>
+#include <sys/types.h>
 
 #include <log/log.h>
 #include <pb-protocol/pb-protocol.h>
@@ -13,11 +20,18 @@
 #include "paths.h"
 #include "resource.h"
 
+static const char *boot_hook_dir = PKG_SYSCONF_DIR "/boot.d";
+enum {
+	BOOT_HOOK_EXIT_OK	= 0,
+	BOOT_HOOK_EXIT_UPDATE	= 2,
+};
+
+
 struct boot_task {
 	char *local_image;
 	char *local_initrd;
 	char *local_dtb;
-	const char *args;
+	char *args;
 
 	bool dry_run;
 };
@@ -139,6 +153,128 @@ static void update_status(boot_status_fn fn, void *arg, int type,
 	fn(arg, &status);
 }
 
+static void boot_hook_update_param(void *ctx, struct boot_task *task,
+		const char *name, const char *value)
+{
+	struct p {
+		const char *name;
+		char **p;
+	} *param, params[] = {
+		{ "boot_image",		&task->local_image },
+		{ "boot_initrd",	&task->local_initrd },
+		{ "boot_dtb",		&task->local_dtb },
+		{ "boot_args",		&task->args },
+		{ NULL, NULL },
+	};
+
+	for (param = params; param->name; param++) {
+		if (strcmp(param->name, name))
+			continue;
+
+		*param->p = talloc_strdup(ctx, value);
+		return;
+	}
+}
+
+static void boot_hook_update(void *ctx, const char *hookname,
+		struct boot_task *task, char *buf)
+{
+	char *line, *name, *val, *sep;
+	char *saveptr;
+
+	for (;; buf = NULL) {
+
+		line = strtok_r(buf, "\n", &saveptr);
+		if (!line)
+			break;
+
+		sep = strchr(line, '=');
+		if (!sep)
+			continue;
+
+		*sep = '\0';
+		name = line;
+		val = sep + 1;
+
+		boot_hook_update_param(ctx, task, name, val);
+
+		pb_log("boot hook %s specified %s=%s\n",
+				hookname, name, val);
+	}
+}
+
+static void boot_hook_setenv(struct boot_task *task)
+{
+	unsetenv("boot_image");
+	unsetenv("boot_initrd");
+	unsetenv("boot_dtb");
+	unsetenv("boot_args");
+
+	setenv("boot_image", task->local_image, 1);
+	if (task->local_initrd)
+		setenv("boot_initrd", task->local_initrd, 1);
+	if (task->local_dtb)
+		setenv("boot_dtb", task->local_dtb, 1);
+	if (task->args)
+		setenv("boot_args", task->args, 1);
+}
+
+static int hook_filter(const struct dirent *dirent)
+{
+	return dirent->d_type == DT_REG || dirent->d_type == DT_LNK;
+}
+
+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(void *ctx, struct boot_task *task,
+		boot_status_fn status_fn, void *status_arg)
+{
+	struct dirent **hooks;
+	int i, n;
+
+	n = scandir(boot_hook_dir, &hooks, hook_filter, hook_cmp);
+	if (n < 1)
+		return;
+
+	update_status(status_fn, status_arg, BOOT_STATUS_INFO,
+			"running boot hooks");
+
+	boot_hook_setenv(task);
+
+	for (i = 0; i < n; i++) {
+		const char *argv[2] = { NULL, NULL };
+		char *path, *buf;
+		int buf_len, rc;
+
+		path = join_paths(ctx, boot_hook_dir, hooks[i]->d_name);
+
+		if (access(path, X_OK))
+			continue;
+
+		pb_log("running boot hook %s\n", hooks[i]->d_name);
+
+		argv[0] = path;
+		rc = pb_run_cmd_pipe(argv, 1, task->dry_run, ctx,
+				&buf, &buf_len);
+
+		/* 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(ctx, hooks[i]->d_name, task, buf);
+			boot_hook_setenv(task);
+		}
+
+		talloc_free(buf);
+		talloc_free(path);
+	}
+
+	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)
 {
@@ -185,6 +321,9 @@ int boot(void *ctx, struct discover_boot_option *opt, struct boot_command *cmd,
 
 	result = -1;
 
+	boot_task.local_initrd = NULL;
+	boot_task.local_dtb = NULL;
+
 	update_status(status_fn, status_arg, BOOT_STATUS_INFO,
 			"loading kernel");
 	boot_task.local_image = load_url(NULL, image, &clean_image);
@@ -194,7 +333,6 @@ int boot(void *ctx, struct discover_boot_option *opt, struct boot_command *cmd,
 		goto no_load;
 	}
 
-	boot_task.local_initrd = NULL;
 	if (initrd) {
 		update_status(status_fn, status_arg, BOOT_STATUS_INFO,
 				"loading initrd");
@@ -206,7 +344,6 @@ int boot(void *ctx, struct discover_boot_option *opt, struct boot_command *cmd,
 		}
 	}
 
-	boot_task.local_dtb = NULL;
 	if (dtb) {
 		update_status(status_fn, status_arg, BOOT_STATUS_INFO,
 				"loading device tree");
@@ -218,6 +355,8 @@ int boot(void *ctx, struct discover_boot_option *opt, struct boot_command *cmd,
 		}
 	}
 
+	run_boot_hooks(ctx, &boot_task, status_fn, status_arg);
+
 	update_status(status_fn, status_arg, BOOT_STATUS_INFO,
 			"performing kexec_load");