From 4b8c59a17adef232c3e1997b47876e7df72bbce3 Mon Sep 17 00:00:00 2001
From: Guillaume Cottenceau <gc@mandriva.com>
Date: Mon, 24 Sep 2001 22:39:09 +0000
Subject: hd.img now detects partition types... backport from DrakX :-)

---
 mdk-stage1/disk.c   | 103 +++++++++++++++++++++++++++++++++++++++++++++++++++-
 mdk-stage1/mount.c  |   2 +-
 mdk-stage1/mount.h  |   4 ++
 mdk-stage1/stage1.c |   2 +-
 4 files changed, 107 insertions(+), 4 deletions(-)

diff --git a/mdk-stage1/disk.c b/mdk-stage1/disk.c
index ec9e1a97f..515b95395 100644
--- a/mdk-stage1/disk.c
+++ b/mdk-stage1/disk.c
@@ -37,6 +37,100 @@
 
 #include "disk.h"
 
+struct partition_detection_anchor {
+	off_t offset;
+	const char * anchor;
+};
+
+static int seek_and_compare(int fd, struct partition_detection_anchor anch)
+{
+	char buf[500];
+	int count;
+	if (lseek(fd, anch.offset, SEEK_SET) == (off_t)-1) {
+		log_perror("seek failed");
+		return -1;
+	}
+	count = read(fd, buf, strlen(anch.anchor));
+	if (count != strlen(anch.anchor)) {
+		log_perror("read failed");
+		return -1;
+	}
+	buf[count] = '\0';
+	if (strcmp(anch.anchor, buf))
+		return 1;
+	return 0;
+}
+
+static const char * detect_partition_type(char * dev)
+{
+	struct partition_detection_info {
+		const char * name;
+		struct partition_detection_anchor anchor0;
+		struct partition_detection_anchor anchor1;
+		struct partition_detection_anchor anchor2;
+	};
+	struct partition_detection_info partitions_signatures[] = { 
+		{ "Linux Swap", { 4086, "SWAP-SPACE" }, { 0, NULL } },
+		{ "Linux Swap", { 4086, "SWAPSPACE2" }, { 0, NULL } },
+		{ "Ext2", { 0x438, "\x53\xEF" }, { 0, NULL } },
+		{ "ReiserFS", { 0x10034, "ReIsErFs" }, { 0, NULL } },
+		{ "ReiserFS", { 0x10034, "ReIsEr2Fs" }, { 0, NULL } },
+		{ "XFS", { 0, "XFSB" }, { 0x200, "XAGF" }, { 0x400, "XAGI" } },
+		{ "JFS", { 0x8000, "JFS1" }, { 0, NULL } },
+		{ "NTFS", { 0x1FE, "\x55\xAA" }, { 0x3, "NTFS" }, { 0, NULL } },
+		{ "FAT32", { 0x1FE, "\x55\xAA" }, { 0x52, "FAT32" }, { 0, NULL } },
+		{ "FAT", { 0x1FE, "\x55\xAA" }, { 0x36, "FAT" }, { 0, NULL } },
+		{ "Linux LVM", { 0, "HM\1\0" }, { 0, NULL }, { 0, NULL } }
+	};
+	int partitions_signatures_nb = sizeof(partitions_signatures) / sizeof(struct partition_detection_info);
+	int i;
+	int fd;
+
+	char device_fullname[50];
+	strcpy(device_fullname, "/dev/");
+	strcat(device_fullname, dev);
+
+	if (ensure_dev_exists(device_fullname))
+		return NULL;
+	log_message("guessing type of %s", device_fullname);
+
+	if ((fd = open(device_fullname, O_RDONLY, 0)) < 0) {
+		log_perror("open");
+		return NULL;
+	}
+	
+	for (i=0; i<partitions_signatures_nb; i++) {
+		int results = seek_and_compare(fd, partitions_signatures[i].anchor0);
+		if (results == -1)
+			goto detect_partition_type_end;
+		if (results == 1)
+			continue;
+		if (!partitions_signatures[i].anchor1.anchor)
+			goto detect_partition_found_it;
+
+		results = seek_and_compare(fd, partitions_signatures[i].anchor1);
+		if (results == -1)
+			goto detect_partition_type_end;
+		if (results == 1)
+			continue;
+		if (!partitions_signatures[i].anchor2.anchor)
+			goto detect_partition_found_it;
+
+		results = seek_and_compare(fd, partitions_signatures[i].anchor2);
+		if (results == -1)
+			goto detect_partition_type_end;
+		if (results == 1)
+			continue;
+
+	detect_partition_found_it:
+		return partitions_signatures[i].name;
+	}
+
+ detect_partition_type_end:
+	close(fd);
+	return NULL;
+}
+
 static char * disk_extract_list_directory(char * direct)
 {
 	char ** full = list_directory(direct);
@@ -84,9 +178,14 @@ static enum return_type try_with_device(char *dev_name)
 		bzero(name, sizeof(name));
 		sscanf(buf, " %d %d %d %s", &major, &minor, &blocks, name);
 		if ((strstr(name, dev_name) == name) && (blocks > 1) && (name[strlen(dev_name)] != '\0')) {
+			const char * partition_type = detect_partition_type(name);
 			parts[i] = strdup(name);
-			parts_comments[i] = (char *) malloc(sizeof(char) * 25);
-			snprintf(parts_comments[i], 24, "size: %d Mbytes", blocks >> 10);
+			parts_comments[i] = (char *) malloc(sizeof(char) * 100);
+			sprintf(parts_comments[i], "size: %d Mbytes", blocks >> 10);
+			if (partition_type) {
+				strcat(parts_comments[i], ", type: ");
+				strcat(parts_comments[i], partition_type);
+			}
 			i++;
 		}
 	}
diff --git a/mdk-stage1/mount.c b/mdk-stage1/mount.c
index b41604cfe..257638421 100644
--- a/mdk-stage1/mount.c
+++ b/mdk-stage1/mount.c
@@ -34,7 +34,7 @@
 
 #ifndef DISABLE_MEDIAS
 /* WARNING: this won't work if the argument is not /dev/ based */
-static int ensure_dev_exists(char *dev)
+int ensure_dev_exists(char *dev)
 {
 	int major, minor;
 	int type = S_IFBLK; /* my default type is block. don't forget to change for chars */
diff --git a/mdk-stage1/mount.h b/mdk-stage1/mount.h
index 992796bde..82795462f 100644
--- a/mdk-stage1/mount.h
+++ b/mdk-stage1/mount.h
@@ -28,4 +28,8 @@
 
 int my_mount(char *dev, char *location, char *fs, int force_rw);
 
+#ifndef DISABLE_MEDIAS
+int ensure_dev_exists(char *dev);
+#endif
+
 #endif
diff --git a/mdk-stage1/stage1.c b/mdk-stage1/stage1.c
index b8c6914ce..de9bffd2f 100644
--- a/mdk-stage1/stage1.c
+++ b/mdk-stage1/stage1.c
@@ -324,7 +324,7 @@ static enum return_type method_select_and_prepare(void)
 	results = ask_from_list_auto("Please choose the installation method.", means, &choice, "method", means_auto);
 
 	if (results != RETURN_OK)
-		return 	method_select_and_prepare();
+		return method_select_and_prepare();
 
 	results = RETURN_ERROR;
 
-- 
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