retry patch using cache if in-place write fails (cdb621bf) · Commits · e / os / android_build

tools/applypatch/applypatch.c

+226 −183

Original line number	Diff line number	Diff line
		@@ -21,6 +21,8 @@
		#include <string.h>
		#include <sys/stat.h>
		#include <sys/statfs.h>
		#include <sys/types.h>
		#include <fcntl.h>
		#include <unistd.h>

		#include "mincrypt/sha.h"
		@@ -30,6 +32,7 @@
		int SaveFileContents(const char* filename, FileContents file);
		int LoadMTDContents(const char* filename, FileContents* file);
		int ParseSha1(const char* str, uint8_t* digest);
		size_t FileSink(unsigned char* data, size_t len, void* token);

		static int mtd_partitions_scanned = 0;

		@@ -45,7 +48,7 @@ int LoadFileContents(const char* filename, FileContents* file) {
		}

		if (stat(filename, &file->st) != 0) {
		fprintf(stderr, "failed to stat \"%s\": %s\n", filename, strerror(errno));
		printf("failed to stat \"%s\": %s\n", filename, strerror(errno));
		return -1;
		}

		@@ -54,7 +57,7 @@ int LoadFileContents(const char* filename, FileContents* file) {

		FILE* f = fopen(filename, "rb");
		if (f == NULL) {
		fprintf(stderr, "failed to open \"%s\": %s\n", filename, strerror(errno));
		printf("failed to open \"%s\": %s\n", filename, strerror(errno));
		free(file->data);
		file->data = NULL;
		return -1;
		@@ -62,7 +65,7 @@ int LoadFileContents(const char* filename, FileContents* file) {

		size_t bytes_read = fread(file->data, 1, file->size, f);
		if (bytes_read != file->size) {
		fprintf(stderr, "short read of \"%s\" (%d bytes of %d)\n",
		printf("short read of \"%s\" (%d bytes of %d)\n",
		filename, bytes_read, file->size);
		free(file->data);
		file->data = NULL;
		@@ -108,7 +111,7 @@ int LoadMTDContents(const char* filename, FileContents* file) {
		char* copy = strdup(filename);
		const char* magic = strtok(copy, ":");
		if (strcmp(magic, "MTD") != 0) {
		fprintf(stderr, "LoadMTDContents called with bad filename (%s)\n",
		printf("LoadMTDContents called with bad filename (%s)\n",
		filename);
		return -1;
		}
		@@ -122,7 +125,7 @@ int LoadMTDContents(const char* filename, FileContents* file) {
		}
		}
		if (colons < 3 \|\| colons%2 == 0) {
		fprintf(stderr, "LoadMTDContents called with bad filename (%s)\n",
		printf("LoadMTDContents called with bad filename (%s)\n",
		filename);
		}

		@@ -135,7 +138,7 @@ int LoadMTDContents(const char* filename, FileContents* file) {
		const char* size_str = strtok(NULL, ":");
		size[i] = strtol(size_str, NULL, 10);
		if (size[i] == 0) {
		fprintf(stderr, "LoadMTDContents called with bad size (%s)\n", filename);
		printf("LoadMTDContents called with bad size (%s)\n", filename);
		return -1;
		}
		sha1sum[i] = strtok(NULL, ":");
		@@ -154,14 +157,14 @@ int LoadMTDContents(const char* filename, FileContents* file) {

		const MtdPartition* mtd = mtd_find_partition_by_name(partition);
		if (mtd == NULL) {
		fprintf(stderr, "mtd partition \"%s\" not found (loading %s)\n",
		printf("mtd partition \"%s\" not found (loading %s)\n",
		partition, filename);
		return -1;
		}

		MtdReadContext* ctx = mtd_read_partition(mtd);
		if (ctx == NULL) {
		fprintf(stderr, "failed to initialize read of mtd partition \"%s\"\n",
		printf("failed to initialize read of mtd partition \"%s\"\n",
		partition);
		return -1;
		}
		@@ -184,7 +187,7 @@ int LoadMTDContents(const char* filename, FileContents* file) {
		if (next > 0) {
		read = mtd_read_data(ctx, p, next);
		if (next != read) {
		fprintf(stderr, "short read (%d bytes of %d) for partition \"%s\"\n",
		printf("short read (%d bytes of %d) for partition \"%s\"\n",
		read, next, partition);
		free(file->data);
		file->data = NULL;
		@@ -201,7 +204,7 @@ int LoadMTDContents(const char* filename, FileContents* file) {
		const uint8_t* sha_so_far = SHA_final(&temp_ctx);

		if (ParseSha1(sha1sum[index[i]], parsed_sha) != 0) {
		fprintf(stderr, "failed to parse sha1 %s in %s\n",
		printf("failed to parse sha1 %s in %s\n",
		sha1sum[index[i]], filename);
		free(file->data);
		file->data = NULL;
		@@ -224,7 +227,7 @@ int LoadMTDContents(const char* filename, FileContents* file) {
		if (i == pairs) {
		// Ran off the end of the list of (size,sha1) pairs without
		// finding a match.
		fprintf(stderr, "contents of MTD partition \"%s\" didn't match %s\n",
		printf("contents of MTD partition \"%s\" didn't match %s\n",
		partition, filename);
		free(file->data);
		file->data = NULL;
		@@ -253,29 +256,29 @@ 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) {
		FILE* f = fopen(filename, "wb");
		if (f == NULL) {
		fprintf(stderr, "failed to open \"%s\" for write: %s\n",
		int fd = open(filename, O_WRONLY \| O_CREAT \| O_TRUNC);
		if (fd < 0) {
		printf("failed to open \"%s\" for write: %s\n",
		filename, strerror(errno));
		return -1;
		}

		size_t bytes_written = fwrite(file.data, 1, file.size, f);
		size_t bytes_written = FileSink(file.data, file.size, &fd);
		if (bytes_written != file.size) {
		fprintf(stderr, "short write of \"%s\" (%d bytes of %d)\n",
		filename, bytes_written, file.size);
		printf("short write of \"%s\" (%d bytes of %d) (%s)\n",
		filename, bytes_written, file.size, strerror(errno));
		close(fd);
		return -1;
		}
		fflush(f);
		fsync(fileno(f));
		fclose(f);
		fsync(fd);
		close(fd);

		if (chmod(filename, file.st.st_mode) != 0) {
		fprintf(stderr, "chmod of \"%s\" failed: %s\n", filename, strerror(errno));
		printf("chmod of \"%s\" failed: %s\n", filename, strerror(errno));
		return -1;
		}
		if (chown(filename, file.st.st_uid, file.st.st_gid) != 0) {
		fprintf(stderr, "chown of \"%s\" failed: %s\n", filename, strerror(errno));
		printf("chown of \"%s\" failed: %s\n", filename, strerror(errno));
		return -1;
		}

		@@ -288,7 +291,7 @@ int WriteToMTDPartition(unsigned char* data, size_t len,
		const char* target_mtd) {
		char* partition = strchr(target_mtd, ':');
		if (partition == NULL) {
		fprintf(stderr, "bad MTD target name \"%s\"\n", target_mtd);
		printf("bad MTD target name \"%s\"\n", target_mtd);
		return -1;
		}
		++partition;
		@@ -306,33 +309,33 @@ int WriteToMTDPartition(unsigned char* data, size_t len,

		const MtdPartition* mtd = mtd_find_partition_by_name(partition);
		if (mtd == NULL) {
		fprintf(stderr, "mtd partition \"%s\" not found for writing\n", partition);
		printf("mtd partition \"%s\" not found for writing\n", partition);
		return -1;
		}

		MtdWriteContext* ctx = mtd_write_partition(mtd);
		if (ctx == NULL) {
		fprintf(stderr, "failed to init mtd partition \"%s\" for writing\n",
		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) {
		fprintf(stderr, "only wrote %d of %d bytes to MTD %s\n",
		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) {
		fprintf(stderr, "error finishing mtd write of %s\n", partition);
		printf("error finishing mtd write of %s\n", partition);
		mtd_write_close(ctx);
		return -1;
		}

		if (mtd_write_close(ctx)) {
		fprintf(stderr, "error closing mtd write of %s\n", partition);
		printf("error closing mtd write of %s\n", partition);
		return -1;
		}

		@@ -381,7 +384,7 @@ int ParseShaArgs(int argc, char argv, Patch patches, int* num_patches) {
		int i;
		for (i = 0; i < *num_patches; ++i) {
		if (ParseSha1(argv[i], (*patches)[i].sha1) != 0) {
		fprintf(stderr, "failed to parse sha1 \"%s\"\n", argv[i]);
		printf("failed to parse sha1 \"%s\"\n", argv[i]);
		return -1;
		}
		if (argv[i][SHA_DIGEST_SIZE*2] == '\0') {
		@@ -389,7 +392,7 @@ int ParseShaArgs(int argc, char argv, Patch patches, int* num_patches) {
		} else if (argv[i][SHA_DIGEST_SIZE*2] == ':') {
		(patches)[i].patch_filename = argv[i] + (SHA_DIGEST_SIZE2+1);
		} else {
		fprintf(stderr, "failed to parse filename \"%s\"\n", argv[i]);
		printf("failed to parse filename \"%s\"\n", argv[i]);
		return -1;
		}
		}
		@@ -414,7 +417,7 @@ const Patch* FindMatchingPatch(uint8_t* sha1, Patch* patches, int num_patches) {
		// nonzero otherwise.
		int CheckMode(int argc, char** argv) {
		if (argc < 3) {
		fprintf(stderr, "no filename given\n");
		printf("no filename given\n");
		return 2;
		}

		@@ -432,7 +435,7 @@ int CheckMode(int argc, char** argv) {
		if (LoadFileContents(argv[2], &file) != 0 \|\|
		(num_patches > 0 &&
		FindMatchingPatch(file.sha1, patches, num_patches) == NULL)) {
		fprintf(stderr, "file \"%s\" doesn't have any of expected "
		printf("file \"%s\" doesn't have any of expected "
		"sha1 sums; checking cache\n", argv[2]);

		free(file.data);
		@@ -444,12 +447,12 @@ int CheckMode(int argc, char** argv) {
		// passes.

		if (LoadFileContents(CACHE_TEMP_SOURCE, &file) != 0) {
		fprintf(stderr, "failed to load cache file\n");
		printf("failed to load cache file\n");
		return 1;
		}

		if (FindMatchingPatch(file.sha1, patches, num_patches) == NULL) {
		fprintf(stderr, "cache bits don't match any sha1 for \"%s\"\n",
		printf("cache bits don't match any sha1 for \"%s\"\n",
		argv[2]);
		return 1;
		}
		@@ -465,7 +468,19 @@ int ShowLicenses() {
		}

		size_t FileSink(unsigned char* data, size_t len, void* token) {
		return fwrite(data, 1, len, (FILE*)token);
		int fd = (int )token;
		ssize_t done = 0;
		ssize_t wrote;
		while (done < (ssize_t) len) {
		wrote = write(fd, data+done, len-done);
		if (wrote <= 0) {
		printf("error writing %d bytes: %s\n", (int)(len-done), strerror(errno));
		return done;
		}
		done += wrote;
		}
		printf("wrote %d bytes to output\n", (int)done);
		return done;
		}

		typedef struct {
		@@ -489,7 +504,7 @@ size_t MemorySink(unsigned char* data, size_t len, void* token) {
		size_t FreeSpaceForFile(const char* filename) {
		struct statfs sf;
		if (statfs(filename, &sf) != 0) {
		fprintf(stderr, "failed to statfs %s: %s\n", filename, strerror(errno));
		printf("failed to statfs %s: %s\n", filename, strerror(errno));
		return -1;
		}
		return sf.f_bsize * sf.f_bfree;
		@@ -583,8 +598,10 @@ int applypatch(int argc, char** argv) {
		target_filename = source_filename;
		}

		printf("\napplying patch to %s\n", source_filename);

		if (ParseSha1(argv[3], target_sha1) != 0) {
		fprintf(stderr, "failed to parse tgt-sha1 \"%s\"\n", argv[3]);
		printf("failed to parse tgt-sha1 \"%s\"\n", argv[3]);
		return 1;
		}

		@@ -605,7 +622,7 @@ int applypatch(int argc, char** argv) {
		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.
		fprintf(stderr, "\"%s\" is already target; no patch needed\n",
		printf("\"%s\" is already target; no patch needed\n",
		target_filename);
		return 0;
		}
		@@ -630,11 +647,11 @@ int applypatch(int argc, char** argv) {

		if (source_patch_filename == NULL) {
		free(source_file.data);
		fprintf(stderr, "source file is bad; trying copy\n");
		printf("source file is bad; trying copy\n");

		if (LoadFileContents(CACHE_TEMP_SOURCE, &copy_file) < 0) {
		// fail.
		fprintf(stderr, "failed to read copy file\n");
		printf("failed to read copy file\n");
		return 1;
		}

		@@ -646,11 +663,32 @@ int applypatch(int argc, char** argv) {

		if (copy_patch_filename == NULL) {
		// fail.
		fprintf(stderr, "copy file doesn't match source SHA-1s either\n");
		printf("copy file doesn't match source SHA-1s either\n");
		return 1;
		}
		}

		int retry = 1;
		SHA_CTX ctx;
		int output;
		MemorySinkInfo msi;
		FileContents* source_to_use;
		char* outname;

		// assume that target_filename (eg "/system/app/Foo.apk") is located
		// on the same filesystem as its top-level directory ("/system").
		// We need something that exists for calling statfs().
		char target_fs[strlen(target_filename)+1];
		char* slash = strchr(target_filename+1, '/');
		if (slash != NULL) {
		int count = slash - target_filename;
		strncpy(target_fs, target_filename, count);
		target_fs[count] = '\0';
		} else {
		strcpy(target_fs, target_filename);
		}

		do {
		// Is there enough room in the target filesystem to hold the patched
		// file?

		@@ -663,29 +701,28 @@ int applypatch(int argc, char** argv) {
		// We still write the original source to cache, in case the MTD
		// write is interrupted.
		if (MakeFreeSpaceOnCache(source_file.size) < 0) {
		fprintf(stderr, "not enough free space on /cache\n");
		printf("not enough free space on /cache\n");
		return 1;
		}
		if (SaveFileContents(CACHE_TEMP_SOURCE, source_file) < 0) {
		fprintf(stderr, "failed to back up source file\n");
		printf("failed to back up source file\n");
		return 1;
		}
		made_copy = 1;
		retry = 0;
		} else {
		// assume that target_filename (eg "/system/app/Foo.apk") is located
		// on the same filesystem as its top-level directory ("/system").
		// We need something that exists for calling statfs().
		char* target_fs = strdup(target_filename);
		char* slash = strchr(target_fs+1, '/');
		if (slash != NULL) {
		*slash = '\0';
		}

		int enough_space = 0;
		if (retry > 0) {
		size_t free_space = FreeSpaceForFile(target_fs);
		int enough_space =
		free_space > (target_size * 3 / 2); // 50% margin of error
		printf("target %ld bytes; free space %ld bytes; enough %d\n",
		(long)target_size, (long)free_space, enough_space);
		(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) {
		retry = 0;
		}

		if (!enough_space && source_patch_filename != NULL) {
		// Using the original source, but not enough free space. First
		@@ -696,17 +733,17 @@ int applypatch(int argc, char** argv) {
		// It's impossible to free space on the target filesystem by
		// deleting the source if the source is an MTD partition. If
		// we're ever in a state where we need to do this, fail.
		fprintf(stderr, "not enough free space for target but source is MTD\n");
		printf("not enough free space for target but source is MTD\n");
		return 1;
		}

		if (MakeFreeSpaceOnCache(source_file.size) < 0) {
		fprintf(stderr, "not enough free space on /cache\n");
		printf("not enough free space on /cache\n");
		return 1;
		}

		if (SaveFileContents(CACHE_TEMP_SOURCE, source_file) < 0) {
		fprintf(stderr, "failed to back up source file\n");
		printf("failed to back up source file\n");
		return 1;
		}
		made_copy = 1;
		@@ -717,7 +754,6 @@ int applypatch(int argc, char** argv) {
		}
		}

		FileContents* source_to_use;
		const char* patch_filename;
		if (source_patch_filename != NULL) {
		source_to_use = &source_file;
		@@ -727,16 +763,15 @@ int applypatch(int argc, char** argv) {
		patch_filename = copy_patch_filename;
		}

		char* outname = NULL;
		FILE* output = NULL;
		MemorySinkInfo msi;
		SinkFn sink = NULL;
		void* token = NULL;
		output = -1;
		outname = NULL;
		if (strncmp(target_filename, "MTD:", 4) == 0) {
		// We store the decoded output in memory.
		msi.buffer = malloc(target_size);
		if (msi.buffer == NULL) {
		fprintf(stderr, "failed to alloc %ld bytes for output\n",
		printf("failed to alloc %ld bytes for output\n",
		(long)target_size);
		return 1;
		}
		@@ -750,75 +785,83 @@ int applypatch(int argc, char** argv) {
		strcpy(outname, target_filename);
		strcat(outname, ".patch");

		output = fopen(outname, "wb");
		if (output == NULL) {
		fprintf(stderr, "failed to open output file %s: %s\n",
		output = open(outname, O_WRONLY \| O_CREAT \| O_TRUNC);
		if (output < 0) {
		printf("failed to open output file %s: %s\n",
		outname, strerror(errno));
		return 1;
		}
		sink = FileSink;
		token = output;
		token = &output;
		}

		#define MAX_HEADER_LENGTH 8
		unsigned char header[MAX_HEADER_LENGTH];
		FILE* patchf = fopen(patch_filename, "rb");
		if (patchf == NULL) {
		fprintf(stderr, "failed to open patch file %s: %s\n",
		printf("failed to open patch file %s: %s\n",
		patch_filename, strerror(errno));
		return 1;
		}
		int header_bytes_read = fread(header, 1, MAX_HEADER_LENGTH, patchf);
		fclose(patchf);

		SHA_CTX ctx;
		SHA_init(&ctx);

		int result;

		if (header_bytes_read >= 4 &&
		header[0] == 0xd6 && header[1] == 0xc3 &&
		header[2] == 0xc4 && header[3] == 0) {
		// xdelta3 patches begin "VCD" (with the high bits set) followed
		// by a zero byte (the version number).
		fprintf(stderr, "error: xdelta3 patches no longer supported\n");
		printf("error: xdelta3 patches no longer supported\n");
		return 1;
		} else if (header_bytes_read >= 8 &&
		memcmp(header, "BSDIFF40", 8) == 0) {
		int result = ApplyBSDiffPatch(source_to_use->data, source_to_use->size,
		result = ApplyBSDiffPatch(source_to_use->data, source_to_use->size,
		patch_filename, 0, sink, token, &ctx);
		if (result != 0) {
		fprintf(stderr, "ApplyBSDiffPatch failed\n");
		return result;
		}
		} else if (header_bytes_read >= 8 &&
		memcmp(header, "IMGDIFF", 7) == 0 &&
		(header[7] == '1' \|\| header[7] == '2')) {
		int result = ApplyImagePatch(source_to_use->data, source_to_use->size,
		result = ApplyImagePatch(source_to_use->data, source_to_use->size,
		patch_filename, sink, token, &ctx);
		if (result != 0) {
		fprintf(stderr, "ApplyImagePatch failed\n");
		return result;
		}
		} else {
		fprintf(stderr, "Unknown patch file format\n");
		printf("Unknown patch file format\n");
		return 1;
		}

		if (output != NULL) {
		fflush(output);
		fsync(fileno(output));
		fclose(output);
		if (output >= 0) {
		fsync(output);
		close(output);
		}

		if (result != 0) {
		if (retry == 0) {
		printf("applying patch failed\n");
		return result;
		} else {
		printf("applying patch failed; retrying\n");
		}
		if (outname != NULL) {
		unlink(outname);
		}
		} else {
		// succeeded; no need to retry
		break;
		}
		} while (retry-- > 0);

		const uint8_t* current_target_sha1 = SHA_final(&ctx);
		if (memcmp(current_target_sha1, target_sha1, SHA_DIGEST_SIZE) != 0) {
		fprintf(stderr, "patch did not produce expected sha1\n");
		printf("patch did not produce expected sha1\n");
		return 1;
		}

		if (output == NULL) {
		if (output < 0) {
		// Copy the temp file to the MTD partition.
		if (WriteToMTDPartition(msi.buffer, msi.pos, target_filename) != 0) {
		fprintf(stderr, "write of patched data to %s failed\n", target_filename);
		printf("write of patched data to %s failed\n", target_filename);
		return 1;
		}
		free(msi.buffer);
		@@ -826,18 +869,18 @@ int applypatch(int argc, char** argv) {
		// Give the .patch file the same owner, group, and mode of the
		// original source file.
		if (chmod(outname, source_to_use->st.st_mode) != 0) {
		fprintf(stderr, "chmod of \"%s\" failed: %s\n", outname, strerror(errno));
		printf("chmod of \"%s\" failed: %s\n", outname, strerror(errno));
		return 1;
		}
		if (chown(outname, source_to_use->st.st_uid,
		source_to_use->st.st_gid) != 0) {
		fprintf(stderr, "chown of \"%s\" failed: %s\n", outname, strerror(errno));
		printf("chown of \"%s\" failed: %s\n", outname, strerror(errno));
		return 1;
		}

		// Finally, rename the .patch file to replace the target file.
		if (rename(outname, target_filename) != 0) {
		fprintf(stderr, "rename of .patch to \"%s\" failed: %s\n",
		printf("rename of .patch to \"%s\" failed: %s\n",
		target_filename, strerror(errno));
		return 1;
		}

tools/applypatch/freecache.c

+4 −4

Original line number	Diff line number	Diff line
		@@ -16,7 +16,7 @@ static int EliminateOpenFiles(char** files, int file_count) {
		struct dirent* de;
		d = opendir("/proc");
		if (d == NULL) {
		fprintf(stderr, "error opening /proc: %s\n", strerror(errno));
		printf("error opening /proc: %s\n", strerror(errno));
		return -1;
		}
		while ((de = readdir(d)) != 0) {
		@@ -35,7 +35,7 @@ static int EliminateOpenFiles(char** files, int file_count) {
		struct dirent* fdde;
		fdd = opendir(path);
		if (fdd == NULL) {
		fprintf(stderr, "error opening %s: %s\n", path, strerror(errno));
		printf("error opening %s: %s\n", path, strerror(errno));
		continue;
		}
		while ((fdde = readdir(fdd)) != 0) {
		@@ -88,7 +88,7 @@ int FindExpendableFiles(char*** names, int* entries) {
		for (i = 0; i < sizeof(dirs)/sizeof(dirs[0]); ++i) {
		d = opendir(dirs[i]);
		if (d == NULL) {
		fprintf(stderr, "error opening %s: %s\n", dirs[i], strerror(errno));
		printf("error opening %s: %s\n", dirs[i], strerror(errno));
		continue;
		}

		@@ -143,7 +143,7 @@ int MakeFreeSpaceOnCache(size_t bytes_needed) {

		if (entries == 0) {
		// nothing we can delete to free up space!
		fprintf(stderr, "no files can be deleted to free space on /cache\n");
		printf("no files can be deleted to free space on /cache\n");
		return -1;
		}

tools/applypatch/imgdiff.c

+25 −25

File changed.

Preview size limit exceeded, changes collapsed.

tools/applypatch/imgpatch.c

+26 −26

File changed.

Preview size limit exceeded, changes collapsed.

tools/applypatch/main.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -44,7 +44,7 @@ extern int applypatch(int argc, char** argv);
		int main(int argc, char** argv) {
		int result = applypatch(argc, argv);
		if (result == 2) {
		fprintf(stderr,
		printf(
		"usage: %s <src-file> <tgt-file> <tgt-sha1> <tgt-size> "
		"[<src-sha1>:<patch> ...]\n"
		" or %s -c <file> [<sha1> ...]\n"