337 lines
9.2 KiB
C
337 lines
9.2 KiB
C
/*
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* Guillaume Cottenceau (gc@mandrakesoft.com)
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*
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* Copyright 2000 MandrakeSoft
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*
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* This software may be freely redistributed under the terms of the GNU
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* public license.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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/*
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* Portions from Erik Troan (ewt@redhat.com)
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*
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* Copyright 1996 Red Hat Software
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*
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*/
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#include <stdlib.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/mount.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include "stage1.h"
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#include "frontend.h"
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#include "modules.h"
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#include "probing.h"
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#include "log.h"
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#include "mount.h"
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#include "lomount.h"
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#include "automatic.h"
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#include "disk.h"
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struct partition_detection_anchor {
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off_t offset;
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const char * anchor;
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};
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static int seek_and_compare(int fd, struct partition_detection_anchor anch)
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{
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char buf[500];
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int count;
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if (lseek(fd, anch.offset, SEEK_SET) == (off_t)-1) {
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log_perror("seek failed");
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return -1;
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}
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count = read(fd, buf, strlen(anch.anchor));
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if (count != strlen(anch.anchor)) {
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log_perror("read failed");
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return -1;
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}
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buf[count] = '\0';
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if (strcmp(anch.anchor, buf))
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return 1;
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return 0;
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}
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static const char * detect_partition_type(char * dev)
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{
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struct partition_detection_info {
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const char * name;
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struct partition_detection_anchor anchor0;
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struct partition_detection_anchor anchor1;
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struct partition_detection_anchor anchor2;
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};
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struct partition_detection_info partitions_signatures[] = {
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{ "Linux Swap", { 4086, "SWAP-SPACE" }, { 0, NULL } },
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{ "Linux Swap", { 4086, "SWAPSPACE2" }, { 0, NULL } },
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{ "Ext2", { 0x438, "\x53\xEF" }, { 0, NULL } },
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{ "ReiserFS", { 0x10034, "ReIsErFs" }, { 0, NULL } },
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{ "ReiserFS", { 0x10034, "ReIsEr2Fs" }, { 0, NULL } },
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{ "XFS", { 0, "XFSB" }, { 0x200, "XAGF" }, { 0x400, "XAGI" } },
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{ "JFS", { 0x8000, "JFS1" }, { 0, NULL } },
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{ "NTFS", { 0x1FE, "\x55\xAA" }, { 0x3, "NTFS" }, { 0, NULL } },
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{ "FAT32", { 0x1FE, "\x55\xAA" }, { 0x52, "FAT32" }, { 0, NULL } },
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{ "FAT", { 0x1FE, "\x55\xAA" }, { 0x36, "FAT" }, { 0, NULL } },
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{ "Linux LVM", { 0, "HM\1\0" }, { 0, NULL }, { 0, NULL } }
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};
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int partitions_signatures_nb = sizeof(partitions_signatures) / sizeof(struct partition_detection_info);
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int i;
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int fd;
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char device_fullname[50];
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strcpy(device_fullname, "/dev/");
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strcat(device_fullname, dev);
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if (ensure_dev_exists(device_fullname))
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return NULL;
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log_message("guessing type of %s", device_fullname);
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if ((fd = open(device_fullname, O_RDONLY, 0)) < 0) {
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log_perror("open");
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return NULL;
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}
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for (i=0; i<partitions_signatures_nb; i++) {
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int results = seek_and_compare(fd, partitions_signatures[i].anchor0);
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if (results == -1)
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goto detect_partition_type_end;
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if (results == 1)
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continue;
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if (!partitions_signatures[i].anchor1.anchor)
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goto detect_partition_found_it;
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results = seek_and_compare(fd, partitions_signatures[i].anchor1);
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if (results == -1)
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goto detect_partition_type_end;
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if (results == 1)
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continue;
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if (!partitions_signatures[i].anchor2.anchor)
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goto detect_partition_found_it;
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results = seek_and_compare(fd, partitions_signatures[i].anchor2);
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if (results == -1)
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goto detect_partition_type_end;
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if (results == 1)
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continue;
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detect_partition_found_it:
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return partitions_signatures[i].name;
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}
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detect_partition_type_end:
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close(fd);
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return NULL;
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}
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static char * disk_extract_list_directory(char * direct)
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{
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char ** full = list_directory(direct);
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char tmp[2000] = "";
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int i;
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for (i=0; i<5 ; i++) {
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if (!full || !*full)
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break;
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strcat(tmp, *full);
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strcat(tmp, "\n");
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full++;
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}
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return strdup(tmp);
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}
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static enum return_type try_with_device(char *dev_name)
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{
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char * questions_location[] = { "Directory or ISO image", NULL };
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char * questions_location_auto[] = { "directory", NULL };
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static char ** answers_location = NULL;
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char device_fullname[50];
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char location_full[500];
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char * disk_own_mount = "/tmp/hdimage";
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int major, minor, blocks;
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char name[100];
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char buf[512];
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FILE * f;
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char * parts[50];
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char * parts_comments[50];
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struct stat statbuf;
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int i = 0;
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enum return_type results;
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char * choice;
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if (!(f = fopen("/proc/partitions", "rb")) || !fgets(buf, sizeof(buf), f) || !fgets(buf, sizeof(buf), f)) {
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log_perror(dev_name);
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stg1_error_message("Could not read partitions information.");
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return RETURN_ERROR;
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}
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while (fgets(buf, sizeof(buf), f)) {
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bzero(name, sizeof(name));
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sscanf(buf, " %d %d %d %s", &major, &minor, &blocks, name);
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if ((strstr(name, dev_name) == name) && (blocks > 1) && (name[strlen(dev_name)] != '\0')) {
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const char * partition_type = detect_partition_type(name);
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parts[i] = strdup(name);
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parts_comments[i] = (char *) malloc(sizeof(char) * 100);
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sprintf(parts_comments[i], "size: %d Mbytes", blocks >> 10);
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if (partition_type) {
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strcat(parts_comments[i], ", type: ");
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strcat(parts_comments[i], partition_type);
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}
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i++;
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}
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}
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parts[i] = NULL;
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fclose(f);
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if (parts[0] == NULL) {
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stg1_error_message("No partitions found.");
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return RETURN_ERROR;
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}
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results = ask_from_list_comments_auto("Please choose the partition where is copied the " DISTRIB_NAME " Distribution.",
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parts, parts_comments, &choice, "partition", parts);
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if (results != RETURN_OK)
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return results;
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strcpy(device_fullname, "/dev/");
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strcat(device_fullname, choice);
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if (my_mount(device_fullname, disk_own_mount, "ext2", 0) == -1 &&
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my_mount(device_fullname, disk_own_mount, "vfat", 0) == -1 &&
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my_mount(device_fullname, disk_own_mount, "reiserfs", 0) == -1) {
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stg1_error_message("I can't find a valid filesystem (tried: ext2, vfat, reiserfs).");
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return try_with_device(dev_name);
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}
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if (ask_from_entries_auto("Please enter the directory (or ISO image file) containing the " DISTRIB_NAME " Distribution.",
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questions_location, &answers_location, 24, questions_location_auto, NULL) != RETURN_OK) {
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umount(disk_own_mount);
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return try_with_device(dev_name);
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}
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strcpy(location_full, disk_own_mount);
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strcat(location_full, "/");
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strcat(location_full, answers_location[0]);
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if (access(location_full, R_OK)) {
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stg1_error_message("Directory or ISO image file could not be found on partition.\n"
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"Here's a short extract of the files in the root of the partition:\n"
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"%s", disk_extract_list_directory(disk_own_mount));
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umount(disk_own_mount);
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return try_with_device(dev_name);
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}
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unlink(IMAGE_LOCATION);
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if (!stat(location_full, &statbuf) && !S_ISDIR(statbuf.st_mode)) {
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log_message("%s exists and is not a directory, assuming this is an ISO image", location_full);
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if (lomount(location_full, IMAGE_LOCATION)) {
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stg1_error_message("Could not mount file %s as an ISO image of the " DISTRIB_NAME " Distribution.", answers_location[0]);
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umount(disk_own_mount);
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return try_with_device(dev_name);
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}
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} else
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{
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if(symlink(location_full, IMAGE_LOCATION))
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perror("symlink");
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}
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if (IS_SPECIAL_STAGE2 || ramdisk_possible()) {
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/* RAMDISK install */
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if (access(IMAGE_LOCATION RAMDISK_LOCATION, R_OK)) {
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stg1_error_message("I can't find the " DISTRIB_NAME " Distribution in the specified directory. "
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"(I need the subdirectory " RAMDISK_LOCATION ")\n"
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"Here's a short extract of the files in the directory:\n"
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"%s", disk_extract_list_directory(IMAGE_LOCATION));
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loumount();
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umount(disk_own_mount);
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return try_with_device(dev_name);
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}
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if (load_ramdisk() != RETURN_OK) {
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stg1_error_message("Could not load program into memory.");
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loumount();
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umount(disk_own_mount);
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return try_with_device(dev_name);
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}
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} else {
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/* LIVE install */
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char p;
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if (access(get_ramdisk_path(), R_OK)) {
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stg1_error_message("I can't find the " DISTRIB_NAME " Distribution in the specified directory. "
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"Here's a short extract of the files in the directory:\n"
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"%s", disk_extract_list_directory(IMAGE_LOCATION));
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loumount();
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umount(disk_own_mount);
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return try_with_device(dev_name);
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}
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log_message("found the " DISTRIB_NAME " Installation, good news!");
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}
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if (IS_RESCUE) {
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loumount();
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umount(disk_own_mount);
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}
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method_name = strdup("disk");
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return RETURN_OK;
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}
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enum return_type disk_prepare(void)
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{
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char ** medias, ** ptr, ** medias_models;
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char * choice;
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int i, count = 0;
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enum return_type results;
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my_insmod("sd_mod", ANY_DRIVER_TYPE, NULL);
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get_medias(DISK, &medias, &medias_models);
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ptr = medias;
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while (ptr && *ptr) {
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count++;
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ptr++;
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}
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if (count == 0) {
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stg1_error_message("No DISK drive found.");
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i = ask_insmod(SCSI_ADAPTERS);
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if (i == RETURN_BACK)
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return RETURN_BACK;
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return disk_prepare();
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}
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if (count == 1) {
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results = try_with_device(*medias);
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if (results == RETURN_OK)
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return RETURN_OK;
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i = ask_insmod(SCSI_ADAPTERS);
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if (i == RETURN_BACK)
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return RETURN_BACK;
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return disk_prepare();
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}
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results = ask_from_list_comments_auto("Please choose the DISK drive on which you copied the " DISTRIB_NAME " Distribution.",
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medias, medias_models, &choice, "disk", medias);
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if (results != RETURN_OK)
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return results;
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results = try_with_device(choice);
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if (results == RETURN_OK)
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return RETURN_OK;
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i = ask_insmod(SCSI_ADAPTERS);
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if (i == RETURN_BACK)
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return RETURN_BACK;
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return disk_prepare();
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}
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