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-rw-r--r--applypatch/applypatch.c147
1 files changed, 129 insertions, 18 deletions
diff --git a/applypatch/applypatch.c b/applypatch/applypatch.c
index 488fd8c6f..0dcdce0b1 100644
--- a/applypatch/applypatch.c
+++ b/applypatch/applypatch.c
@@ -39,7 +39,8 @@ static int GenerateTarget(FileContents* source_file,
const char* source_filename,
const char* target_filename,
const uint8_t target_sha1[SHA_DIGEST_SIZE],
- size_t target_size);
+ size_t target_size,
+ const Value* bonus_data);
static int mtd_partitions_scanned = 0;
@@ -420,18 +421,111 @@ int WriteToPartition(unsigned char* data, size_t len,
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));
+ {
+ size_t start = 0;
+ int success = 0;
+ int fd = open(partition, O_RDWR | O_SYNC);
+ if (fd < 0) {
+ printf("failed to open %s: %s\n", partition, strerror(errno));
+ return -1;
+ }
+ int attempt;
+
+ for (attempt = 0; attempt < 10; ++attempt) {
+ size_t next_sync = start + (1<<20);
+ printf("raw O_SYNC write %s attempt %d start at %d\n", partition, attempt+1, start);
+ lseek(fd, start, SEEK_SET);
+ while (start < len) {
+ size_t to_write = len - start;
+ if (to_write > 4096) to_write = 4096;
+
+ ssize_t written = write(fd, data+start, to_write);
+ if (written < 0) {
+ if (errno == EINTR) {
+ written = 0;
+ } else {
+ printf("failed write writing to %s (%s)\n",
+ partition, strerror(errno));
+ return -1;
+ }
+ }
+ start += written;
+ if (start >= next_sync) {
+ fsync(fd);
+ next_sync = start + (1<<20);
+ }
+ }
+ fsync(fd);
+
+ // drop caches so our subsequent verification read
+ // won't just be reading the cache.
+ sync();
+ int dc = open("/proc/sys/vm/drop_caches", O_WRONLY);
+ write(dc, "3\n", 2);
+ close(dc);
+ sleep(1);
+ printf(" caches dropped\n");
+
+ // verify
+ lseek(fd, 0, SEEK_SET);
+ unsigned char buffer[4096];
+ start = len;
+ size_t p;
+ for (p = 0; p < len; p += sizeof(buffer)) {
+ size_t to_read = len - p;
+ if (to_read > sizeof(buffer)) to_read = sizeof(buffer);
+
+ size_t so_far = 0;
+ while (so_far < to_read) {
+ ssize_t read_count = read(fd, buffer+so_far, to_read-so_far);
+ if (read_count < 0) {
+ if (errno == EINTR) {
+ read_count = 0;
+ } else {
+ printf("verify read error %s at %d: %s\n",
+ partition, p, strerror(errno));
+ return -1;
+ }
+ }
+ if ((size_t)read_count < to_read) {
+ printf("short verify read %s at %d: %d %d %s\n",
+ partition, p, read_count, to_read, strerror(errno));
+ }
+ so_far += read_count;
+ }
+
+ if (memcmp(buffer, data+p, to_read)) {
+ printf("verification failed starting at %d\n", p);
+ start = p;
+ break;
+ }
+ }
+
+ if (start == len) {
+ printf("verification read succeeded (attempt %d)\n", attempt+1);
+ success = true;
+ break;
+ }
+
+ sleep(2);
+ }
+
+ if (!success) {
+ printf("failed to verify after all attempts\n");
return -1;
}
- if (fclose(f) != 0) {
+
+ if (close(fd) != 0) {
printf("error closing %s (%s)\n", partition, strerror(errno));
return -1;
}
+ // hack: sync and sleep after closing in hopes of getting
+ // the data actually onto flash.
+ printf("sleeping after close\n");
+ sync();
+ sleep(5);
break;
+ }
}
free(copy);
@@ -472,7 +566,7 @@ int ParseSha1(const char* str, uint8_t* digest) {
// Search an array of sha1 strings for one matching the given sha1.
// Return the index of the match on success, or -1 if no match is
// found.
-int FindMatchingPatch(uint8_t* sha1, const char** patch_sha1_str,
+int FindMatchingPatch(uint8_t* sha1, char* const * const patch_sha1_str,
int num_patches) {
int i;
uint8_t patch_sha1[SHA_DIGEST_SIZE];
@@ -584,6 +678,14 @@ int CacheSizeCheck(size_t bytes) {
}
}
+static void print_short_sha1(const uint8_t sha1[SHA_DIGEST_SIZE]) {
+ int i;
+ const char* hex = "0123456789abcdef";
+ for (i = 0; i < 4; ++i) {
+ putchar(hex[(sha1[i]>>4) & 0xf]);
+ putchar(hex[sha1[i] & 0xf]);
+ }
+}
// This function applies binary patches to files in a way that is safe
// (the original file is not touched until we have the desired
@@ -617,8 +719,9 @@ int applypatch(const char* source_filename,
size_t target_size,
int num_patches,
char** const patch_sha1_str,
- Value** patch_data) {
- printf("\napplying patch to %s\n", source_filename);
+ Value** patch_data,
+ Value* bonus_data) {
+ printf("patch %s: ", source_filename);
if (target_filename[0] == '-' &&
target_filename[1] == '\0') {
@@ -644,8 +747,9 @@ int applypatch(const char* source_filename,
if (memcmp(source_file.sha1, target_sha1, SHA_DIGEST_SIZE) == 0) {
// The early-exit case: the patch was already applied, this file
// has the desired hash, nothing for us to do.
- printf("\"%s\" is already target; no patch needed\n",
- target_filename);
+ printf("already ");
+ print_short_sha1(target_sha1);
+ putchar('\n');
free(source_file.data);
return 0;
}
@@ -699,7 +803,7 @@ int applypatch(const char* source_filename,
int result = GenerateTarget(&source_file, source_patch_value,
&copy_file, copy_patch_value,
source_filename, target_filename,
- target_sha1, target_size);
+ target_sha1, target_size, bonus_data);
free(source_file.data);
free(copy_file.data);
@@ -713,7 +817,8 @@ static int GenerateTarget(FileContents* source_file,
const char* source_filename,
const char* target_filename,
const uint8_t target_sha1[SHA_DIGEST_SIZE],
- size_t target_size) {
+ size_t target_size,
+ const Value* bonus_data) {
int retry = 1;
SHA_CTX ctx;
int output;
@@ -766,8 +871,10 @@ static int GenerateTarget(FileContents* source_file,
enough_space =
(free_space > (256 << 10)) && // 256k (two-block) minimum
(free_space > (target_size * 3 / 2)); // 50% margin of error
- printf("target %ld bytes; free space %ld bytes; retry %d; enough %d\n",
- (long)target_size, (long)free_space, retry, enough_space);
+ if (!enough_space) {
+ printf("target %ld bytes; free space %ld bytes; retry %d; enough %d\n",
+ (long)target_size, (long)free_space, retry, enough_space);
+ }
}
if (!enough_space) {
@@ -802,7 +909,7 @@ static int GenerateTarget(FileContents* source_file,
unlink(source_filename);
size_t free_space = FreeSpaceForFile(target_fs);
- printf("(now %ld bytes free for target)\n", (long)free_space);
+ printf("(now %ld bytes free for target) ", (long)free_space);
}
}
@@ -867,7 +974,7 @@ static int GenerateTarget(FileContents* source_file,
} else if (header_bytes_read >= 8 &&
memcmp(header, "IMGDIFF2", 8) == 0) {
result = ApplyImagePatch(source_to_use->data, source_to_use->size,
- patch, sink, token, &ctx);
+ patch, sink, token, &ctx, bonus_data);
} else {
printf("Unknown patch file format\n");
return 1;
@@ -898,6 +1005,10 @@ static int GenerateTarget(FileContents* source_file,
if (memcmp(current_target_sha1, target_sha1, SHA_DIGEST_SIZE) != 0) {
printf("patch did not produce expected sha1\n");
return 1;
+ } else {
+ printf("now ");
+ print_short_sha1(target_sha1);
+ putchar('\n');
}
if (output < 0) {
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-04 12:34:37 +0100