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Use _repo_mapping in C++ runfiles library
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Work towards bazelbuild#16124

Closes bazelbuild#16701.

PiperOrigin-RevId: 487806351
Change-Id: I3b04fef84d817b0875bfd71c65efe6db13468b13
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@fmeum
fmeum committed Nov 11, 2022
1 parent feed6ce commit d6a6a3a
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Showing 4 changed files with 127 additions and 153 deletions.
52 changes: 52 additions & 0 deletions src/test/py/bazel/bzlmod/bazel_module_test.py
View file
Original file line number Diff line number Diff line change
Expand Up @@ -694,5 +694,57 @@ def testRunfilesRepoMappingManifest(self):
self.Path('bazel-bin/external/bar~2.0/bar.runfiles_manifest')) as f:
self.assertIn('_repo_mapping ', f.read())

def testCppRunfilesLibraryRepoMapping(self):
self.main_registry.setModuleBasePath('projects')
projects_dir = self.main_registry.projects

self.main_registry.createLocalPathModule('data', '1.0', 'data')
projects_dir.joinpath('data').mkdir(exist_ok=True)
scratchFile(projects_dir.joinpath('data', 'WORKSPACE'))
scratchFile(projects_dir.joinpath('data', 'foo.txt'), ['hello'])
scratchFile(
projects_dir.joinpath('data', 'BUILD'), ['exports_files(["foo.txt"])'])

self.main_registry.createLocalPathModule('test', '1.0', 'test',
{'data': '1.0'})
projects_dir.joinpath('test').mkdir(exist_ok=True)
scratchFile(projects_dir.joinpath('test', 'WORKSPACE'))
scratchFile(
projects_dir.joinpath('test', 'BUILD'), [
'cc_test(',
' name = "test",',
' srcs = ["test.cpp"],',
' data = ["@data//:foo.txt"],',
' args = ["$(rlocationpath @data//:foo.txt)"],',
' deps = ["@bazel_tools//tools/cpp/runfiles"],',
')',
])
scratchFile(
projects_dir.joinpath('test', 'test.cpp'), [
'#include <cstdlib>',
'#include <fstream>',
'#include "tools/cpp/runfiles/runfiles.h"',
'using bazel::tools::cpp::runfiles::Runfiles;',
'int main(int argc, char** argv) {',
' Runfiles* runfiles = Runfiles::Create(argv[0], BAZEL_CURRENT_REPOSITORY);',
' std::ifstream f1(runfiles->Rlocation(argv[1]));',
' if (!f1.good()) std::exit(1);',
' std::ifstream f2(runfiles->Rlocation("data/foo.txt"));',
' if (!f2.good()) std::exit(2);',
'}',
])

self.ScratchFile('MODULE.bazel', ['bazel_dep(name="test",version="1.0")'])
self.ScratchFile('WORKSPACE')

# Run sandboxed on Linux and macOS.
exit_code, stderr, stdout = self.RunBazel(
['test', '@test//:test', '--test_output=errors'], allow_failure=True)
self.AssertExitCode(exit_code, 0, stderr, stdout)
# Run unsandboxed on all platforms.
exit_code, stderr, stdout = self.RunBazel(['run', '@test//:test'],
allow_failure=True)
self.AssertExitCode(exit_code, 0, stderr, stdout)

if __name__ == '__main__':
unittest.main()
92 changes: 29 additions & 63 deletions tools/cpp/runfiles/runfiles_src.cc
View file
Original file line number Diff line number Diff line change
Expand Up @@ -96,15 +96,13 @@ bool IsDirectory(const string& path) {

bool PathsFrom(const std::string& argv0, std::string runfiles_manifest_file,
std::string runfiles_dir, std::string* out_manifest,
std::string* out_directory, std::string* out_repo_mapping);
std::string* out_directory);

bool PathsFrom(const std::string& argv0, std::string runfiles_manifest_file,
std::string runfiles_dir,
std::function<bool(const std::string&)> is_runfiles_manifest,
std::function<bool(const std::string&)> is_runfiles_directory,
std::function<bool(const std::string&)> is_repo_mapping,
std::string* out_manifest, std::string* out_directory,
std::string* out_repo_mapping);
std::string* out_manifest, std::string* out_directory);

bool ParseManifest(const string& path, map<string, string>* result,
string* error);
Expand All @@ -117,9 +115,9 @@ Runfiles* Runfiles::Create(const string& argv0,
const string& runfiles_manifest_file,
const string& runfiles_dir,
const string& source_repository, string* error) {
string manifest, directory, repo_mapping;
string manifest, directory;
if (!PathsFrom(argv0, runfiles_manifest_file, runfiles_dir, &manifest,
&directory, &repo_mapping)) {
&directory)) {
if (error) {
std::ostringstream err;
err << "ERROR: " << __FILE__ << "(" << __LINE__
Expand All @@ -144,10 +142,10 @@ Runfiles* Runfiles::Create(const string& argv0,
}

map<pair<string, string>, string> mapping;
if (!repo_mapping.empty()) {
if (!ParseRepoMapping(repo_mapping, &mapping, error)) {
return nullptr;
}
if (!ParseRepoMapping(
RlocationUnchecked("_repo_mapping", runfiles, directory), &mapping,
error)) {
return nullptr;
}

return new Runfiles(std::move(runfiles), std::move(directory),
Expand Down Expand Up @@ -196,28 +194,28 @@ string Runfiles::Rlocation(const string& path,
return path;
}

if (repo_mapping_.empty()) {
return RlocationUnchecked(path);
}
string::size_type first_slash = path.find_first_of('/');
if (first_slash == string::npos) {
return RlocationUnchecked(path);
return RlocationUnchecked(path, runfiles_map_, directory_);
}
string target_apparent = path.substr(0, first_slash);
auto target =
repo_mapping_.find(std::make_pair(source_repo, target_apparent));
if (target == repo_mapping_.cend()) {
return RlocationUnchecked(path);
return RlocationUnchecked(path, runfiles_map_, directory_);
}
return RlocationUnchecked(target->second + path.substr(first_slash));
return RlocationUnchecked(target->second + path.substr(first_slash),
runfiles_map_, directory_);
}

string Runfiles::RlocationUnchecked(const string& path) const {
const auto exact_match = runfiles_map_.find(path);
if (exact_match != runfiles_map_.end()) {
string Runfiles::RlocationUnchecked(const string& path,
const map<string, string>& runfiles_map,
const string& directory) {
const auto exact_match = runfiles_map.find(path);
if (exact_match != runfiles_map.end()) {
return exact_match->second;
}
if (!runfiles_map_.empty()) {
if (!runfiles_map.empty()) {
// If path references a runfile that lies under a directory that itself is a
// runfile, then only the directory is listed in the manifest. Look up all
// prefixes of path in the manifest and append the relative path from the
Expand All @@ -226,14 +224,14 @@ string Runfiles::RlocationUnchecked(const string& path) const {
while ((prefix_end = path.find_last_of('/', prefix_end - 1)) !=
string::npos) {
const string prefix = path.substr(0, prefix_end);
const auto prefix_match = runfiles_map_.find(prefix);
if (prefix_match != runfiles_map_.end()) {
const auto prefix_match = runfiles_map.find(prefix);
if (prefix_match != runfiles_map.end()) {
return prefix_match->second + "/" + path.substr(prefix_end + 1);
}
}
}
if (!directory_.empty()) {
return directory_ + "/" + path;
if (!directory.empty()) {
return directory + "/" + path;
}
return "";
}
Expand Down Expand Up @@ -279,13 +277,7 @@ bool ParseRepoMapping(const string& path,
string* error) {
std::ifstream stm(path);
if (!stm.is_open()) {
if (error) {
std::ostringstream err;
err << "ERROR: " << __FILE__ << "(" << __LINE__
<< "): cannot open repository mapping \"" << path << "\"";
*error = err.str();
}
return false;
return true;
}
string line;
std::getline(stm, line);
Expand Down Expand Up @@ -333,12 +325,9 @@ namespace testing {
bool TestOnly_PathsFrom(const string& argv0, string mf, string dir,
function<bool(const string&)> is_runfiles_manifest,
function<bool(const string&)> is_runfiles_directory,
function<bool(const string&)> is_repo_mapping,
string* out_manifest, string* out_directory,
string* out_repo_mapping) {
string* out_manifest, string* out_directory) {
return PathsFrom(argv0, mf, dir, is_runfiles_manifest, is_runfiles_directory,
is_repo_mapping, out_manifest, out_directory,
out_repo_mapping);
out_manifest, out_directory);
}

bool TestOnly_IsAbsolute(const string& path) { return IsAbsolute(path); }
Expand Down Expand Up @@ -376,23 +365,19 @@ Runfiles* Runfiles::CreateForTest(std::string* error) {
namespace {

bool PathsFrom(const string& argv0, string mf, string dir, string* out_manifest,
string* out_directory, string* out_repo_mapping) {
string* out_directory) {
return PathsFrom(
argv0, mf, dir, [](const string& path) { return IsReadableFile(path); },
[](const string& path) { return IsDirectory(path); },
[](const string& path) { return IsReadableFile(path); }, out_manifest,
out_directory, out_repo_mapping);
[](const string& path) { return IsDirectory(path); }, out_manifest,
out_directory);
}

bool PathsFrom(const string& argv0, string mf, string dir,
function<bool(const string&)> is_runfiles_manifest,
function<bool(const string&)> is_runfiles_directory,
function<bool(const string&)> is_repo_mapping,
string* out_manifest, string* out_directory,
string* out_repo_mapping) {
string* out_manifest, string* out_directory) {
out_manifest->clear();
out_directory->clear();
out_repo_mapping->clear();

bool mfValid = is_runfiles_manifest(mf);
bool dirValid = is_runfiles_directory(dir);
Expand Down Expand Up @@ -428,21 +413,6 @@ bool PathsFrom(const string& argv0, string mf, string dir,
dirValid = is_runfiles_directory(dir);
}

string rm;
bool rmValid = false;

if (dirValid && ends_with(dir, ".runfiles")) {
rm = dir.substr(0, dir.size() - 9) + ".repo_mapping";
rmValid = is_repo_mapping(rm);
}

if (!rmValid && mfValid &&
(ends_with(mf, ".runfiles_manifest") ||
ends_with(mf, ".runfiles/MANIFEST"))) {
rm = mf.substr(0, mf.size() - 18) + ".repo_mapping";
rmValid = is_repo_mapping(rm);
}

if (mfValid) {
*out_manifest = mf;
}
Expand All @@ -451,10 +421,6 @@ bool PathsFrom(const string& argv0, string mf, string dir,
*out_directory = dir;
}

if (rmValid) {
*out_repo_mapping = rm;
}

return true;
}

Expand Down
11 changes: 6 additions & 5 deletions tools/cpp/runfiles/runfiles_src.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -206,14 +206,17 @@ class Runfiles {
Runfiles& operator=(const Runfiles&) = delete;
Runfiles& operator=(Runfiles&&) = delete;

static std::string RlocationUnchecked(
const std::string& path,
const std::map<std::string, std::string>& runfiles_map,
const std::string& directory);

const std::map<std::string, std::string> runfiles_map_;
const std::string directory_;
const std::map<std::pair<std::string, std::string>, std::string>
repo_mapping_;
const std::vector<std::pair<std::string, std::string> > envvars_;
const std::string source_repository_;

std::string RlocationUnchecked(const std::string& path) const;
};

// The "testing" namespace contains functions that allow unit testing the code.
Expand Down Expand Up @@ -243,9 +246,7 @@ bool TestOnly_PathsFrom(
std::string runfiles_dir,
std::function<bool(const std::string&)> is_runfiles_manifest,
std::function<bool(const std::string&)> is_runfiles_directory,
std::function<bool(const std::string&)> is_repo_mapping,
std::string* out_manifest, std::string* out_directory,
std::string* out_repo_mapping);
std::string* out_manifest, std::string* out_directory);

// For testing only.
// Returns true if `path` is an absolute Unix or Windows path.
Expand Down
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