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85 lines
2.4 KiB
85 lines
2.4 KiB
/* |
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* Copyright (C) 2014 The Android Open Source Project |
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* |
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* Licensed under the Apache License, Version 2.0 (the "License"); |
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* you may not use this file except in compliance with the License. |
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* You may obtain a copy of the License at |
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* |
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* http://www.apache.org/licenses/LICENSE-2.0 |
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* |
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* Unless required by applicable law or agreed to in writing, software |
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* distributed under the License is distributed on an "AS IS" BASIS, |
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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* See the License for the specific language governing permissions and |
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* limitations under the License. |
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*/ |
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#include <stdlib.h> |
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#include <stdio.h> |
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#include <string.h> |
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#include <errno.h> |
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#include <sys/mount.h> |
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#include <sys/stat.h> |
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#include <unistd.h> |
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#include <fcntl.h> |
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#include <android-base/file.h> |
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#include "fuse_sideload.h" |
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struct file_data { |
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int fd; // the underlying sdcard file |
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uint64_t file_size; |
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uint32_t block_size; |
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}; |
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static int read_block_file(void* cookie, uint32_t block, uint8_t* buffer, uint32_t fetch_size) { |
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file_data* fd = reinterpret_cast<file_data*>(cookie); |
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off64_t offset = ((off64_t) block) * fd->block_size; |
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if (TEMP_FAILURE_RETRY(lseek64(fd->fd, offset, SEEK_SET)) == -1) { |
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fprintf(stderr, "seek on sdcard failed: %s\n", strerror(errno)); |
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return -EIO; |
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} |
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if (!android::base::ReadFully(fd->fd, buffer, fetch_size)) { |
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fprintf(stderr, "read on sdcard failed: %s\n", strerror(errno)); |
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return -EIO; |
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} |
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return 0; |
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} |
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static void close_file(void* cookie) { |
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file_data* fd = reinterpret_cast<file_data*>(cookie); |
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close(fd->fd); |
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} |
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bool start_sdcard_fuse(const char* path) { |
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struct stat sb; |
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if (stat(path, &sb) == -1) { |
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fprintf(stderr, "failed to stat %s: %s\n", path, strerror(errno)); |
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return false; |
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} |
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file_data fd; |
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fd.fd = open(path, O_RDONLY); |
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if (fd.fd == -1) { |
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fprintf(stderr, "failed to open %s: %s\n", path, strerror(errno)); |
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return false; |
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} |
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fd.file_size = sb.st_size; |
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fd.block_size = 65536; |
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provider_vtab vtab; |
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vtab.read_block = read_block_file; |
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vtab.close = close_file; |
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// The installation process expects to find the sdcard unmounted. |
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// Unmount it with MNT_DETACH so that our open file continues to |
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// work but new references see it as unmounted. |
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umount2("/sdcard", MNT_DETACH); |
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return run_fuse_sideload(&vtab, &fd, fd.file_size, fd.block_size) == 0; |
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}
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