Use ramdisk_size from kernel cmdline

If we can't get file's size then use ramdisk_size if given.

config-stage1.h

@@ -18,12 +18,6 @@
 #define _GNU_SOURCE 1
 #include "version.h"
 
-/* If we have more than that amount of memory (in bytes), we assume we can load the second stage as a ramdisk */
-#define MEM_LIMIT_RAMDISK (256 * 1024 * 1024)
-
-/* If we have more than that amount of memory (in bytes), we assume we can load the rescue as a ramdisk */
-#define MEM_LIMIT_RESCUE (128 * 1024 * 1024)
-
 #define VERSION_FILE     "/.VERSION"
 #define RAMDISK_LOCATION "/"
 #define IMAGE_LOCATION   "/image"

disk.c

@@ -310,11 +310,11 @@ static enum return_type try_with_partition(char *choice)
 		goto err;
 	}
 
-	if (stat(ramdisk_path, &statbuf)) {
-		stg1_error_message("Could not get ramdisk size: %s", strerror(errno));
+	ramdisk_size = get_ramdisk_size(ramdisk_path);
+	if (ramdisk_size == 0) {
+		stg1_error_message("Could not get %s size: %s", ramdisk_path, strerror(errno));
 		goto err;
 	}
-	ramdisk_size = (unsigned long)statbuf.st_size;
 
 	log_message("found the %s Installation, good news!", version);
 

network.c

@@ -763,11 +763,13 @@ enum return_type ftp_prepare(void)
 	char * questions_auto[] = { "server", "directory", "user", "pass", NULL };
 	static char ** answers = NULL;
 	enum return_type results;
+	unsigned long ramdisk_size;
 
 	update_splash("prepare");
-	if (!ramdisk_possible(MEM_LIMIT_RAMDISK)) {
+	ramdisk_size = get_ramdisk_size(NULL);
+	if (!ramdisk_possible(ramdisk_size)) {
 		stg1_error_message("FTP install needs more than %d Mbytes of memory (detected %u Mbytes).",
-			      BYTES2MB(MEM_LIMIT_RAMDISK), BYTES2MB(total_memory()));
+			      BYTES2MB(ramdisk_size), BYTES2MB(total_memory()));
 		return RETURN_ERROR;
 	}
 
@@ -854,12 +856,14 @@ enum return_type http_prepare(void)
 	char * questions_auto[] = { "server", "directory", NULL };
 	static char ** answers = NULL;
 	enum return_type results;
+	unsigned long ramdisk_size;
 
 	update_splash("prepare");
 
-	if (!ramdisk_possible(MEM_LIMIT_RAMDISK)) {
+	ramdisk_size = get_ramdisk_size(NULL);
+	if (!ramdisk_possible(ramdisk_size)) {
 		stg1_error_message("HTTP install needs more than %d Mbytes of memory (detected %u Mbytes).",
-			      BYTES2MB(MEM_LIMIT_RAMDISK), BYTES2MB(total_memory()));
+			      BYTES2MB(ramdisk_size), BYTES2MB(total_memory()));
 		return RETURN_ERROR;
 	}
 

stage1.c

@@ -342,7 +342,7 @@ void stage1()
 	init_frontend(buf);
 	update_splash("init_frontend");
 
-	if (IS_RESCUE && !ramdisk_possible(MEM_LIMIT_RESCUE)) {
+	if (IS_RESCUE && !ramdisk_possible(get_ramdisk_size(NULL))) {
 		stg1_error_message("You are starting the rescue with a low memory configuration. "
 				   "From that point, experience showed us that the program may stop "
 				   "or crash at any point without immediate proper reason. Continue at "

tools.c

@@ -48,8 +48,15 @@
 #include "init.h"
 #endif
 
+/* If we have more than that amount of memory (in bytes), we assume we can load the second stage as a ramdisk */
+#define MEM_LIMIT_RAMDISK (256 * 1024 * 1024)
+
+/* If we have more than that amount of memory (in bytes), we assume we can load the rescue as a ramdisk */
+#define MEM_LIMIT_RESCUE (128 * 1024 * 1024)
+
 static struct param_elem params[50];
 static int param_number = 0;
+static unsigned long cmdline_ramdisk_size = 0;
 
 void process_cmdline(void)
 {
@@ -105,6 +112,17 @@ void process_cmdline(void)
 			set_param(MODE_AUTOMATIC);
 			grab_automatic_params(value);
 		}
+		if (!strcmp(name, "ramdisk_size")) {
+			long tmp;
+			char *endptr = NULL;
+			errno = 0;
+			tmp = strtol(value, &endptr, 0);
+			if (errno == 0 && endptr && *endptr == '\0' && tmp > 0) {
+				/* ramdisk_size in cmdline given in Kbs, convert
+				 * its value to bytes */
+				cmdline_ramdisk_size = (unsigned long)tmp * 1024;
+			}
+		}
 		if (buf[i] == '\0')
 			break;
 		i++;
@@ -213,6 +231,23 @@ unsigned long total_memory(void)
 	return value;
 }
 
+unsigned long get_ramdisk_size(const char *ramdisk_path)
+{
+	/* If path is given then use it and return 0 if stat failed */
+	if (ramdisk_path) {
+		struct stat statbuf;
+
+		return stat(ramdisk_path, &statbuf) ? 0 : (unsigned long)statbuf.st_size;
+	}
+
+	/* Use ramdisk_size from cmdline if given */
+	if (cmdline_ramdisk_size)
+		return cmdline_ramdisk_size;
+
+	/* Fallback to hardcoded values as last resort */
+	return IS_RESCUE ? MEM_LIMIT_RESCUE : MEM_LIMIT_RAMDISK;
+}
+
 
 int ramdisk_possible(unsigned long ramdisk_size)
 {
@@ -229,7 +264,6 @@ int ramdisk_possible(unsigned long ramdisk_size)
 	}
 }
 
-
 static void save_stuff_for_rescue(void)
 {
 	char * file = "/etc/resolv.conf";
@@ -453,10 +487,9 @@ enum return_type load_ramdisk(char *ramdisk_path, unsigned long size)
 	}
 
 	if (size == 0) {
-		struct stat statr;
-		if (stat(img_name, &statr))
+		size = get_ramdisk_size(img_name);
+		if (size == 0)
 			return RETURN_ERROR;
-		size = (unsigned long)statr.st_size;
 	}
 
 	return load_ramdisk_fd(st2_fd, size);

tools.h

@@ -31,6 +31,7 @@ void unset_param(int i);
 int charstar_to_int(char * s);
 /* Returns total memory in Kb */
 unsigned long total_memory(void);
+unsigned long get_ramdisk_size(const char *ramdisk_path);
 int ramdisk_possible(unsigned long ramdisk_size);
 char * get_ramdisk_realname(void);
 enum return_type load_ramdisk(char *, unsigned long size);