Merge changes from topic "lpdumpd"
* changes:
libbase: realpath is wrapped with TEMP_FAILURE_RETRY
liblp: Replace open with GetControlFileOrOpen
init: expand prop in 'file'
libcutils: android_get_control_file uses realpath.
diff --git a/base/file.cpp b/base/file.cpp
index 2f4a517..adc8984 100644
--- a/base/file.cpp
+++ b/base/file.cpp
@@ -385,7 +385,12 @@
bool Realpath(const std::string& path, std::string* result) {
result->clear();
- char* realpath_buf = realpath(path.c_str(), nullptr);
+ // realpath may exit with EINTR. Retry if so.
+ char* realpath_buf = nullptr;
+ do {
+ realpath_buf = realpath(path.c_str(), nullptr);
+ } while (realpath_buf == nullptr && errno == EINTR);
+
if (realpath_buf == nullptr) {
return false;
}
diff --git a/fs_mgr/liblp/Android.bp b/fs_mgr/liblp/Android.bp
index 355b7a1..7039994 100644
--- a/fs_mgr/liblp/Android.bp
+++ b/fs_mgr/liblp/Android.bp
@@ -43,6 +43,11 @@
windows: {
enabled: true,
},
+ android: {
+ shared_libs: [
+ "libcutils",
+ ],
+ },
},
export_include_dirs: ["include"],
}
diff --git a/fs_mgr/liblp/images.cpp b/fs_mgr/liblp/images.cpp
index 5a498f9..56b5353 100644
--- a/fs_mgr/liblp/images.cpp
+++ b/fs_mgr/liblp/images.cpp
@@ -68,7 +68,7 @@
}
std::unique_ptr<LpMetadata> ReadFromImageFile(const std::string& image_file) {
- unique_fd fd(open(image_file.c_str(), O_RDONLY | O_CLOEXEC));
+ unique_fd fd = GetControlFileOrOpen(image_file.c_str(), O_RDONLY | O_CLOEXEC);
if (fd < 0) {
PERROR << __PRETTY_FUNCTION__ << " open failed: " << image_file;
return nullptr;
@@ -408,7 +408,7 @@
}
int SparseBuilder::OpenImageFile(const std::string& file) {
- android::base::unique_fd source_fd(open(file.c_str(), O_RDONLY | O_CLOEXEC));
+ android::base::unique_fd source_fd = GetControlFileOrOpen(file.c_str(), O_RDONLY | O_CLOEXEC);
if (source_fd < 0) {
PERROR << "open image file failed: " << file;
return -1;
diff --git a/fs_mgr/liblp/partition_opener.cpp b/fs_mgr/liblp/partition_opener.cpp
index 898f241..bb8ec9c 100644
--- a/fs_mgr/liblp/partition_opener.cpp
+++ b/fs_mgr/liblp/partition_opener.cpp
@@ -45,7 +45,7 @@
bool GetBlockDeviceInfo(const std::string& block_device, BlockDeviceInfo* device_info) {
#if defined(__linux__)
- unique_fd fd(open(block_device.c_str(), O_RDONLY));
+ unique_fd fd = GetControlFileOrOpen(block_device.c_str(), O_RDONLY);
if (fd < 0) {
PERROR << __PRETTY_FUNCTION__ << "open '" << block_device << "' failed";
return false;
@@ -85,7 +85,7 @@
unique_fd PartitionOpener::Open(const std::string& partition_name, int flags) const {
std::string path = GetPartitionAbsolutePath(partition_name);
- return unique_fd{open(path.c_str(), flags | O_CLOEXEC)};
+ return GetControlFileOrOpen(path.c_str(), flags | O_CLOEXEC);
}
bool PartitionOpener::GetInfo(const std::string& partition_name, BlockDeviceInfo* info) const {
diff --git a/fs_mgr/liblp/utility.cpp b/fs_mgr/liblp/utility.cpp
index ecf94a4..72a3c57 100644
--- a/fs_mgr/liblp/utility.cpp
+++ b/fs_mgr/liblp/utility.cpp
@@ -28,6 +28,10 @@
#include <ext4_utils/ext4_utils.h>
#include <openssl/sha.h>
+#ifdef __ANDROID__
+#include <cutils/android_get_control_file.h>
+#endif
+
#include "utility.h"
namespace android {
@@ -171,5 +175,19 @@
#endif
}
+base::unique_fd GetControlFileOrOpen(const char* path, int flags) {
+#if defined(__ANDROID__)
+ int fd = android_get_control_file(path);
+ if (fd >= 0) {
+ int newfd = TEMP_FAILURE_RETRY(dup(fd));
+ if (newfd >= 0) {
+ return base::unique_fd(newfd);
+ }
+ PERROR << "Cannot dup fd for already controlled file: " << path << ", reopening...";
+ }
+#endif
+ return base::unique_fd(open(path, flags));
+}
+
} // namespace fs_mgr
} // namespace android
diff --git a/fs_mgr/liblp/utility.h b/fs_mgr/liblp/utility.h
index e8b2ca9..96f1717 100644
--- a/fs_mgr/liblp/utility.h
+++ b/fs_mgr/liblp/utility.h
@@ -22,6 +22,7 @@
#include <sys/types.h>
#include <android-base/logging.h>
+#include <android-base/unique_fd.h>
#include "liblp/liblp.h"
@@ -92,6 +93,8 @@
// Call BLKROSET ioctl on fd so that fd is readonly / read-writable.
bool SetBlockReadonly(int fd, bool readonly);
+::android::base::unique_fd GetControlFileOrOpen(const char* path, int flags);
+
} // namespace fs_mgr
} // namespace android
diff --git a/init/service.cpp b/init/service.cpp
index cba42c4..6d08cb1 100644
--- a/init/service.cpp
+++ b/init/service.cpp
@@ -756,6 +756,11 @@
if (args[2] != "r" && args[2] != "w" && args[2] != "rw") {
return Error() << "file type must be 'r', 'w' or 'rw'";
}
+ std::string expanded;
+ if (!expand_props(args[1], &expanded)) {
+ return Error() << "Could not expand property in file path '" << args[1] << "'";
+ }
+ args[1] = std::move(expanded);
if ((args[1][0] != '/') || (args[1].find("../") != std::string::npos)) {
return Error() << "file name must not be relative";
}
diff --git a/libcutils/android_get_control_file.cpp b/libcutils/android_get_control_file.cpp
index f9964d2..d5b0894 100644
--- a/libcutils/android_get_control_file.cpp
+++ b/libcutils/android_get_control_file.cpp
@@ -39,6 +39,11 @@
#include <sys/types.h>
#include <unistd.h>
+#include <string>
+
+#include <android-base/file.h>
+#include <android-base/stringprintf.h>
+
#include "android_get_control_env.h"
int __android_get_control_from_env(const char* prefix, const char* name) {
@@ -72,26 +77,22 @@
}
int android_get_control_file(const char* path) {
- int fd = __android_get_control_from_env(ANDROID_FILE_ENV_PREFIX, path);
+ std::string given_path;
+ if (!android::base::Realpath(path, &given_path)) return -1;
+
+ // Try path, then realpath(path), as keys to get the fd from env.
+ auto fd = __android_get_control_from_env(ANDROID_FILE_ENV_PREFIX, path);
+ if (fd < 0) {
+ fd = __android_get_control_from_env(ANDROID_FILE_ENV_PREFIX, given_path.c_str());
+ if (fd < 0) return fd;
+ }
// Find file path from /proc and make sure it is correct
- char *proc = NULL;
- if (asprintf(&proc, "/proc/self/fd/%d", fd) < 0) return -1;
- if (!proc) return -1;
+ auto proc = android::base::StringPrintf("/proc/self/fd/%d", fd);
+ std::string fd_path;
+ if (!android::base::Realpath(proc, &fd_path)) return -1;
- size_t len = strlen(path);
- // readlink() does not guarantee a nul byte, len+2 so we catch truncation.
- char *buf = static_cast<char *>(calloc(1, len + 2));
- if (!buf) {
- free(proc);
- return -1;
- }
- ssize_t ret = TEMP_FAILURE_RETRY(readlink(proc, buf, len + 1));
- free(proc);
- int cmp = (len != static_cast<size_t>(ret)) || strcmp(buf, path);
- free(buf);
- if (ret < 0) return -1;
- if (cmp != 0) return -1;
+ if (given_path != fd_path) return -1;
// It is what we think it is
return fd;