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/** |
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* This file is part of the CernVM File System. |
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* |
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* The Fuse module entry point. Dynamically selects either the libfuse3 |
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* cvmfs fuse module or the libfuse2 one, depending on the availability and on |
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* the mount options. |
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* |
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*/ |
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#include "fuse_main.h" |
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#include <dlfcn.h> |
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#include <unistd.h> |
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#include <cassert> |
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#include <cstdlib> |
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#include <cstring> |
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#include <string> |
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#include <vector> |
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#include "util/logging.h" |
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#include "util/platform.h" |
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#include "util/smalloc.h" |
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#include "util/string.h" |
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using namespace stub; // NOLINT |
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int main(int argc, char **argv) { |
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// Getopt option parsing modifies globals and the argv vector |
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const int opterr_save = opterr; |
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const int optc = argc; |
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assert(optc > 0); |
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char **optv = reinterpret_cast<char **>(smalloc(optc * sizeof(char *))); |
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for (int i = 0; i < optc; ++i) { |
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optv[i] = strdup(argv[i]); |
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} |
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bool debug = false; |
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unsigned enforce_libfuse = 0; |
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int c; |
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opterr = 0; |
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while ((c = getopt(optc, optv, "do:")) != -1) { |
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switch (c) { |
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case 'd': |
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debug = true; |
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break; |
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case 'o': |
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std::vector<std::string> mount_options = SplitString(optarg, ','); |
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for (unsigned i = 0; i < mount_options.size(); ++i) { |
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if (mount_options[i] == "debug") { |
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debug = true; |
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} |
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if (HasPrefix(mount_options[i], "libfuse=", false /*ign_case*/)) { |
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std::vector<std::string> t = SplitString(mount_options[i], '='); |
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enforce_libfuse = String2Uint64(t[1]); |
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if (debug) { |
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LogCvmfs(kLogCvmfs, kLogDebug | kLogStdout, |
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"Debug: enforcing libfuse version %u", enforce_libfuse); |
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} |
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} |
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} |
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break; |
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} |
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} |
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opterr = opterr_save; |
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optind = 1; |
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for (int i = 0; i < optc; ++i) { |
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free(optv[i]); |
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} |
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free(optv); |
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const std::string libname_fuse2 = platform_libname("cvmfs_fuse_stub"); |
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const std::string libname_fuse3 = platform_libname("cvmfs_fuse3_stub"); |
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std::string error_messages; |
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if (enforce_libfuse > 0) { |
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if ((enforce_libfuse < 2) || (enforce_libfuse > 3)) { |
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LogCvmfs(kLogCvmfs, kLogStderr | kLogSyslogErr, |
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"Error: invalid libfuse version '%u', valid values are 2 or 3.", |
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enforce_libfuse); |
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return 1; |
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} |
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} |
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std::string local_lib_path = "./"; |
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if (getenv("CVMFS_LIBRARY_PATH") != NULL) { |
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local_lib_path = getenv("CVMFS_LIBRARY_PATH"); |
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if (!local_lib_path.empty() && (*local_lib_path.rbegin() != '/')) |
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local_lib_path.push_back('/'); |
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} |
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// Try loading libfuse3 module, else fallback to version 2 |
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std::vector<std::string> library_paths; |
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if ((enforce_libfuse == 0) || (enforce_libfuse == 3)) { |
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library_paths.push_back(local_lib_path + libname_fuse3); |
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library_paths.push_back("/usr/lib/" + libname_fuse3); |
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library_paths.push_back("/usr/lib64/" + libname_fuse3); |
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#ifdef __APPLE__ |
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library_paths.push_back("/usr/local/lib/" + libname_fuse3); |
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#endif |
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} |
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if ((enforce_libfuse == 0) || (enforce_libfuse == 2)) { |
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library_paths.push_back(local_lib_path + libname_fuse2); |
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library_paths.push_back("/usr/lib/" + libname_fuse2); |
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library_paths.push_back("/usr/lib64/" + libname_fuse2); |
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#ifdef __APPLE__ |
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library_paths.push_back("/usr/local/lib/" + libname_fuse2); |
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#endif |
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} |
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void *library_handle; |
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std::vector<std::string>::const_iterator i = library_paths.begin(); |
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const std::vector<std::string>::const_iterator iend = library_paths.end(); |
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for (; i != iend; ++i) { |
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library_handle = dlopen(i->c_str(), RTLD_NOW | RTLD_LOCAL); |
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if (library_handle != NULL) { |
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if (debug) { |
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LogCvmfs(kLogCvmfs, kLogDebug | kLogStdout, "Debug: using library %s", |
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i->c_str()); |
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} |
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break; |
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} |
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error_messages += std::string(dlerror()) + "\n"; |
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} |
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if (!library_handle) { |
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LogCvmfs(kLogCvmfs, kLogStderr | kLogSyslogErr, |
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"Error: failed to load cvmfs library, tried: '%s'\n%s", |
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JoinStrings(library_paths, "' '").c_str(), error_messages.c_str()); |
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return 1; |
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} |
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CvmfsStubExports **exports_ptr = reinterpret_cast<CvmfsStubExports **>( |
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dlsym(library_handle, "g_cvmfs_stub_exports")); |
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if (exports_ptr == NULL) { |
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LogCvmfs(kLogCvmfs, kLogStderr | kLogSyslogErr, |
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"Error: symbol g_cvmfs_stub_exports not found"); |
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return 1; |
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} |
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return (*exports_ptr)->fn_main(argc, argv); |
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} |
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