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EMMC support in applypatch

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Let applypatch read and write EMMC partitions as well as MTD ones.
This enables incremental updates that include boot image changes, as
well as OTA of new recovery partitions.

Change-Id: I3766b9e77c639769ddf693b675da51d57f6e6b1d
This commit is contained in:
Doug Zongker 2010-07-07 13:55:25 -07:00
parent 3d177d055c
commit f291d858f8
2 changed files with 181 additions and 108 deletions
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287
applypatch/applypatch.c
View File

@ -30,10 +30,10 @@
#include "mtdutils/mtdutils.h"
#include "edify/expr.h"
int SaveFileContents(const char* filename, FileContents file);
int LoadMTDContents(const char* filename, FileContents* file);
static int SaveFileContents(const char* filename, FileContents file);
static int LoadPartitionContents(const char* filename, FileContents* file);
int ParseSha1(const char* str, uint8_t* digest);
ssize_t FileSink(unsigned char* data, ssize_t len, void* token);
static ssize_t FileSink(unsigned char* data, ssize_t len, void* token);
static int mtd_partitions_scanned = 0;
@ -42,10 +42,11 @@ static int mtd_partitions_scanned = 0;
int LoadFileContents(const char* filename, FileContents* file) {
file->data = NULL;
// A special 'filename' beginning with "MTD:" means to load the
// contents of an MTD partition.
if (strncmp(filename, "MTD:", 4) == 0) {
return LoadMTDContents(filename, file);
// A special 'filename' beginning with "MTD:" or "EMMC:" means to
// load the contents of a partition.
if (strncmp(filename, "MTD:", 4) == 0 ||
strncmp(filename, "EMMC:", 5) == 0) {
return LoadPartitionContents(filename, file);
}
if (stat(filename, &file->st) != 0) {
@ -98,26 +99,35 @@ void FreeFileContents(FileContents* file) {
free(file);
}
// Load the contents of an MTD partition into the provided
// Load the contents of an MTD or EMMC partition into the provided
// FileContents. filename should be a string of the form
// "MTD:<partition_name>:<size_1>:<sha1_1>:<size_2>:<sha1_2>:...".
// The smallest size_n bytes for which that prefix of the mtd contents
// has the corresponding sha1 hash will be loaded. It is acceptable
// for a size value to be repeated with different sha1s. Will return
// 0 on success.
// "MTD:<partition_name>:<size_1>:<sha1_1>:<size_2>:<sha1_2>:..." (or
// "EMMC:<partition_device>:..."). The smallest size_n bytes for
// which that prefix of the partition contents has the corresponding
// sha1 hash will be loaded. It is acceptable for a size value to be
// repeated with different sha1s. Will return 0 on success.
//
// This complexity is needed because if an OTA installation is
// interrupted, the partition might contain either the source or the
// target data, which might be of different lengths. We need to know
// the length in order to read from MTD (there is no "end-of-file"
// marker), so the caller must specify the possible lengths and the
// hash of the data, and we'll do the load expecting to find one of
// those hashes.
int LoadMTDContents(const char* filename, FileContents* file) {
// the length in order to read from a partition (there is no
// "end-of-file" marker), so the caller must specify the possible
// lengths and the hash of the data, and we'll do the load expecting
// to find one of those hashes.
enum PartitionType { MTD, EMMC };
static int LoadPartitionContents(const char* filename, FileContents* file) {
char* copy = strdup(filename);
const char* magic = strtok(copy, ":");
if (strcmp(magic, "MTD") != 0) {
printf("LoadMTDContents called with bad filename (%s)\n",
enum PartitionType type;
if (strcmp(magic, "MTD") == 0) {
type = MTD;
} else if (strcmp(magic, "EMMC") == 0) {
type = EMMC;
} else {
printf("LoadPartitionContents called with bad filename (%s)\n",
filename);
return -1;
}
@ -131,7 +141,7 @@ int LoadMTDContents(const char* filename, FileContents* file) {
}
}
if (colons < 3 || colons%2 == 0) {
printf("LoadMTDContents called with bad filename (%s)\n",
printf("LoadPartitionContents called with bad filename (%s)\n",
filename);
}
@ -144,7 +154,7 @@ int LoadMTDContents(const char* filename, FileContents* file) {
const char* size_str = strtok(NULL, ":");
size[i] = strtol(size_str, NULL, 10);
if (size[i] == 0) {
printf("LoadMTDContents called with bad size (%s)\n", filename);
printf("LoadPartitionContents called with bad size (%s)\n", filename);
return -1;
}
sha1sum[i] = strtok(NULL, ":");
@ -156,23 +166,38 @@ int LoadMTDContents(const char* filename, FileContents* file) {
size_array = size;
qsort(index, pairs, sizeof(int), compare_size_indices);
if (!mtd_partitions_scanned) {
mtd_scan_partitions();
mtd_partitions_scanned = 1;
}
MtdReadContext* ctx = NULL;
FILE* dev = NULL;
const MtdPartition* mtd = mtd_find_partition_by_name(partition);
if (mtd == NULL) {
printf("mtd partition \"%s\" not found (loading %s)\n",
partition, filename);
return -1;
}
switch (type) {
case MTD:
if (!mtd_partitions_scanned) {
mtd_scan_partitions();
mtd_partitions_scanned = 1;
}
MtdReadContext* ctx = mtd_read_partition(mtd);
if (ctx == NULL) {
printf("failed to initialize read of mtd partition \"%s\"\n",
partition);
return -1;
const MtdPartition* mtd = mtd_find_partition_by_name(partition);
if (mtd == NULL) {
printf("mtd partition \"%s\" not found (loading %s)\n",
partition, filename);
return -1;
}
ctx = mtd_read_partition(mtd);
if (ctx == NULL) {
printf("failed to initialize read of mtd partition \"%s\"\n",
partition);
return -1;
}
break;
case EMMC:
dev = fopen(partition, "rb");
if (dev == NULL) {
printf("failed to open emmc partition \"%s\": %s\n",
partition, strerror(errno));
return -1;
}
}
SHA_CTX sha_ctx;
@ -191,7 +216,15 @@ int LoadMTDContents(const char* filename, FileContents* file) {
size_t next = size[index[i]] - file->size;
size_t read = 0;
if (next > 0) {
read = mtd_read_data(ctx, p, next);
switch (type) {
case MTD:
read = mtd_read_data(ctx, p, next);
break;
case EMMC:
read = fread(p, 1, next, dev);
break;
}
if (next != read) {
printf("short read (%d bytes of %d) for partition \"%s\"\n",
read, next, partition);
@ -220,7 +253,7 @@ int LoadMTDContents(const char* filename, FileContents* file) {
if (memcmp(sha_so_far, parsed_sha, SHA_DIGEST_SIZE) == 0) {
// we have a match. stop reading the partition; we'll return
// the data we've read so far.
printf("mtd read matched size %d sha %s\n",
printf("partition read matched size %d sha %s\n",
size[index[i]], sha1sum[index[i]]);
break;
}
@ -228,12 +261,21 @@ int LoadMTDContents(const char* filename, FileContents* file) {
p += read;
}
mtd_read_close(ctx);
switch (type) {
case MTD:
mtd_read_close(ctx);
break;
case EMMC:
fclose(dev);
break;
}
if (i == pairs) {
// Ran off the end of the list of (size,sha1) pairs without
// finding a match.
printf("contents of MTD partition \"%s\" didn't match %s\n",
printf("contents of partition \"%s\" didn't match %s\n",
partition, filename);
free(file->data);
file->data = NULL;
@ -261,7 +303,7 @@ int LoadMTDContents(const char* filename, FileContents* file) {
// Save the contents of the given FileContents object under the given
// filename. Return 0 on success.
int SaveFileContents(const char* filename, FileContents file) {
static int SaveFileContents(const char* filename, FileContents file) {
int fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC);
if (fd < 0) {
printf("failed to open \"%s\" for write: %s\n",
@ -292,61 +334,87 @@ int SaveFileContents(const char* filename, FileContents file) {
return 0;
}
// Write a memory buffer to target_mtd partition, a string of the form
// "MTD:<partition>[:...]". Return 0 on success.
int WriteToMTDPartition(unsigned char* data, size_t len,
const char* target_mtd) {
char* partition = strchr(target_mtd, ':');
// Write a memory buffer to 'target' partition, a string of the form
// "MTD:<partition>[:...]" or "EMMC:<partition_device>:". Return 0 on
// success.
int WriteToPartition(unsigned char* data, size_t len,
const char* target) {
char* copy = strdup(target);
const char* magic = strtok(copy, ":");
enum PartitionType type;
if (strcmp(magic, "MTD") == 0) {
type = MTD;
} else if (strcmp(magic, "EMMC") == 0) {
type = EMMC;
} else {
printf("WriteToPartition called with bad target (%s)\n", target);
return -1;
}
const char* partition = strtok(NULL, ":");
if (partition == NULL) {
printf("bad MTD target name \"%s\"\n", target_mtd);
return -1;
}
++partition;
// Trim off anything after a colon, eg "MTD:boot:blah:blah:blah...".
// We want just the partition name "boot".
partition = strdup(partition);
char* end = strchr(partition, ':');
if (end != NULL)
*end = '\0';
if (!mtd_partitions_scanned) {
mtd_scan_partitions();
mtd_partitions_scanned = 1;
}
const MtdPartition* mtd = mtd_find_partition_by_name(partition);
if (mtd == NULL) {
printf("mtd partition \"%s\" not found for writing\n", partition);
printf("bad partition target name \"%s\"\n", target);
return -1;
}
MtdWriteContext* ctx = mtd_write_partition(mtd);
if (ctx == NULL) {
printf("failed to init mtd partition \"%s\" for writing\n",
partition);
return -1;
switch (type) {
case MTD:
if (!mtd_partitions_scanned) {
mtd_scan_partitions();
mtd_partitions_scanned = 1;
}
const MtdPartition* mtd = mtd_find_partition_by_name(partition);
if (mtd == NULL) {
printf("mtd partition \"%s\" not found for writing\n",
partition);
return -1;
}
MtdWriteContext* ctx = mtd_write_partition(mtd);
if (ctx == NULL) {
printf("failed to init mtd partition \"%s\" for writing\n",
partition);
return -1;
}
size_t written = mtd_write_data(ctx, (char*)data, len);
if (written != len) {
printf("only wrote %d of %d bytes to MTD %s\n",
written, len, partition);
mtd_write_close(ctx);
return -1;
}
if (mtd_erase_blocks(ctx, -1) < 0) {
printf("error finishing mtd write of %s\n", partition);
mtd_write_close(ctx);
return -1;
}
if (mtd_write_close(ctx)) {
printf("error closing mtd write of %s\n", partition);
return -1;
}
break;
case EMMC:
;
FILE* f = fopen(partition, "wb");
if (fwrite(data, 1, len, f) != len) {
printf("short write writing to %s (%s)\n",
partition, strerror(errno));
return -1;
}
if (fclose(f) != 0) {
printf("error closing %s (%s)\n", partition, strerror(errno));
return -1;
}
break;
}
size_t written = mtd_write_data(ctx, (char*)data, len);
if (written != len) {
printf("only wrote %d of %d bytes to MTD %s\n",
written, len, partition);
mtd_write_close(ctx);
return -1;
}
if (mtd_erase_blocks(ctx, -1) < 0) {
printf("error finishing mtd write of %s\n", partition);
mtd_write_close(ctx);
return -1;
}
if (mtd_write_close(ctx)) {
printf("error closing mtd write of %s\n", partition);
return -1;
}
free(partition);
free(copy);
return 0;
}
@ -406,7 +474,7 @@ int applypatch_check(const char* filename,
file.data = NULL;
// It's okay to specify no sha1s; the check will pass if the
// LoadFileContents is successful. (Useful for reading MTD
// LoadFileContents is successful. (Useful for reading
// partitions, where the filename encodes the sha1s; no need to
// check them twice.)
if (LoadFileContents(filename, &file) != 0 ||
@ -518,8 +586,8 @@ int CacheSizeCheck(size_t bytes) {
// - otherwise, or if any error is encountered, exits with non-zero
// status.
//
// <source_filename> may refer to an MTD partition to read the source
// data. See the comments for the LoadMTDContents() function above
// <source_filename> may refer to a partition to read the source data.
// See the comments for the LoadPartition Contents() function above
// for the format of such a filename.
int applypatch(const char* source_filename,
@ -623,14 +691,16 @@ int applypatch(const char* source_filename,
// Is there enough room in the target filesystem to hold the patched
// file?
if (strncmp(target_filename, "MTD:", 4) == 0) {
// If the target is an MTD partition, we're actually going to
// write the output to /tmp and then copy it to the partition.
// statfs() always returns 0 blocks free for /tmp, so instead
// we'll just assume that /tmp has enough space to hold the file.
if (strncmp(target_filename, "MTD:", 4) == 0 ||
strncmp(target_filename, "EMMC:", 5) == 0) {
// If the target is a partition, we're actually going to
// write the output to /tmp and then copy it to the
// partition. statfs() always returns 0 blocks free for
// /tmp, so instead we'll just assume that /tmp has enough
// space to hold the file.
// We still write the original source to cache, in case the MTD
// write is interrupted.
// We still write the original source to cache, in case
// the partition write is interrupted.
if (MakeFreeSpaceOnCache(source_file.size) < 0) {
printf("not enough free space on /cache\n");
return 1;
@ -660,11 +730,13 @@ int applypatch(const char* source_filename,
// copy the source file to cache, then delete it from the original
// location.
if (strncmp(source_filename, "MTD:", 4) == 0) {
if (strncmp(source_filename, "MTD:", 4) == 0 ||
strncmp(source_filename, "EMMC:", 5) == 0) {
// It's impossible to free space on the target filesystem by
// deleting the source if the source is an MTD partition. If
// deleting the source if the source is a partition. If
// we're ever in a state where we need to do this, fail.
printf("not enough free space for target but source is MTD\n");
printf("not enough free space for target but source "
"is partition\n");
return 1;
}
@ -703,7 +775,8 @@ int applypatch(const char* source_filename,
void* token = NULL;
output = -1;
outname = NULL;
if (strncmp(target_filename, "MTD:", 4) == 0) {
if (strncmp(target_filename, "MTD:", 4) == 0 ||
strncmp(target_filename, "EMMC:", 5) == 0) {
// We store the decoded output in memory.
msi.buffer = malloc(target_size);
if (msi.buffer == NULL) {
@ -779,8 +852,8 @@ int applypatch(const char* source_filename,
}
if (output < 0) {
// Copy the temp file to the MTD partition.
if (WriteToMTDPartition(msi.buffer, msi.pos, target_filename) != 0) {
// Copy the temp file to the partition.
if (WriteToPartition(msi.buffer, msi.pos, target_filename) != 0) {
printf("write of patched data to %s failed\n", target_filename);
return 1;
}

2
ui.c
View File

@ -29,7 +29,7 @@
#include "minui/minui.h"
#include "recovery_ui.h"
#define MAX_COLS 64
#define MAX_COLS 96
#define MAX_ROWS 32
#define CHAR_WIDTH 10