refactor(3p/nix/libutil): Replace chomp() with absl::strings

third_party/nix/meson.build

@@ -381,6 +381,7 @@ absl_deps = [
   absl.dependency('spinlock_wait'),
   absl.dependency('stacktrace'),
   absl.dependency('strings'),
+  absl.dependency('strings_internal'),
   absl.dependency('symbolize'),
   absl.dependency('synchronization'),
   absl.dependency('throw_delegate'),

third_party/nix/src/build-remote/build-remote.cc

@@ -6,6 +6,8 @@
 #include <set>
 #include <tuple>
 
+#include <absl/strings/ascii.h>
+#include <absl/strings/str_cat.h>
 #include <glog/logging.h>
 
 #include "derivations.hh"
@@ -199,9 +201,10 @@ static int _main(int argc, char* argv[]) {
           storeUri = bestMachine->storeUri;
 
         } catch (std::exception& e) {
-          auto msg = chomp(drainFD(5, false));
+          auto msg = absl::StripTrailingAsciiWhitespace(drainFD(5, false));
           LOG(ERROR) << "cannot build on '" << bestMachine->storeUri
-                     << "': " << e.what() << (msg.empty() ? "" : ": " + msg);
+                     << "': " << e.what()
+                     << (msg.empty() ? "" : absl::StrCat(": ", msg));
           bestMachine->enabled = false;
           continue;
         }

third_party/nix/src/libexpr/primops/fetchGit.cc

@@ -1,6 +1,7 @@
 #include <nlohmann/json.hpp>
 #include <regex>
 
+#include <absl/strings/ascii.h>
 #include <glog/logging.h>
 #include <sys/time.h>
 
@@ -76,7 +77,8 @@ GitInfo exportGit(ref<Store> store, const std::string& uri,
     }
 
     // clean working tree, but no ref or rev specified.  Use 'HEAD'.
-    rev = chomp(runProgram("git", true, {"-C", uri, "rev-parse", "HEAD"}));
+    rev = absl::StripTrailingAsciiWhitespace(
+        runProgram("git", true, {"-C", uri, "rev-parse", "HEAD"}));
     ref = "HEAD"s;
   }
 
@@ -145,7 +147,9 @@ GitInfo exportGit(ref<Store> store, const std::string& uri,
 
   // FIXME: check whether rev is an ancestor of ref.
   GitInfo gitInfo;
-  gitInfo.rev = rev != "" ? rev : chomp(readFile(localRefFile));
+  gitInfo.rev =
+      rev != "" ? rev
+                : absl::StripTrailingAsciiWhitespace(readFile(localRefFile));
   gitInfo.shortRev = std::string(gitInfo.rev, 0, 7);
 
   DLOG(INFO) << "using revision " << gitInfo.rev << " of repo '" << uri << "'";

third_party/nix/src/libexpr/primops/fetchMercurial.cc

@@ -1,6 +1,7 @@
 #include <nlohmann/json.hpp>
 #include <regex>
 
+#include <absl/strings/ascii.h>
 #include <glog/logging.h>
 #include <sys/time.h>
 
@@ -43,7 +44,8 @@ HgInfo exportMercurial(ref<Store> store, const std::string& uri,
 
       HgInfo hgInfo;
       hgInfo.rev = "0000000000000000000000000000000000000000";
-      hgInfo.branch = chomp(runProgram("hg", true, {"branch", "-R", uri}));
+      hgInfo.branch = absl::StripTrailingAsciiWhitespace(
+          runProgram("hg", true, {"branch", "-R", uri}));
 
       auto files = tokenizeString<std::set<std::string>>(
           runProgram("hg", true,

third_party/nix/src/libstore/build.cc

@@ -12,6 +12,7 @@
 #include <sstream>
 #include <thread>
 
+#include <absl/strings/ascii.h>
 #include <fcntl.h>
 #include <grp.h>
 #include <netdb.h>
@@ -461,7 +462,7 @@ void handleDiffHook(uid_t uid, uid_t gid, Path tryA, Path tryB, Path drvPath,
       }
 
       if (!diffRes.second.empty()) {
-        LOG(ERROR) << chomp(diffRes.second);
+        LOG(ERROR) << absl::StripTrailingAsciiWhitespace(diffRes.second);
       }
     } catch (Error& error) {
       LOG(ERROR) << "diff hook execution failed: " << error.what();
@@ -1640,7 +1641,8 @@ MakeError(NotDeterministic, BuildError)
 
       hookEnvironment.emplace("DRV_PATH", drvPath);
       hookEnvironment.emplace("OUT_PATHS",
-                              chomp(concatStringsSep(" ", outputPaths)));
+                              absl::StripTrailingAsciiWhitespace(
+                                  concatStringsSep(" ", outputPaths)));
 
       RunOptions opts(settings.postBuildHook, {});
       opts.environment = hookEnvironment;
@@ -1788,7 +1790,8 @@ HookReply DerivationGoal::tryBuildHook() {
   } catch (SysError& e) {
     if (e.errNo == EPIPE) {
       LOG(ERROR) << "build hook died unexpectedly: "
-                 << chomp(drainFD(worker.hook->fromHook.readSide.get()));
+                 << absl::StripTrailingAsciiWhitespace(
+                        drainFD(worker.hook->fromHook.readSide.get()));
       worker.hook = nullptr;
       return rpDecline;
     }

third_party/nix/src/libstore/download.cc

@@ -1,5 +1,7 @@
 #include "download.hh"
 
+#include <absl/strings/ascii.h>
+
 #include "archive.hh"
 #include "compression.hh"
 #include "finally.hh"
@@ -231,7 +233,9 @@ struct CurlDownloader : public Downloader {
     static int debugCallback(CURL* handle, curl_infotype type, char* data,
                              size_t size, void* userptr) {
       if (type == CURLINFO_TEXT) {
-        DLOG(INFO) << "curl: " << chomp(std::string(data, size));
+        DLOG(INFO) << "curl: "
+                   << absl::StripTrailingAsciiWhitespace(
+                          std::string(data, size));
       }
       return 0;
     }

third_party/nix/src/libstore/meson.build

@@ -80,7 +80,7 @@ libstore_dep_list = [
     pthread_dep,
     sqlite3_dep,
     libsodium_dep
-]
+] + absl_deps
 
 if sys_name.contains('linux')
     libstore_dep_list += libseccomp_dep

third_party/nix/src/libstore/remote-store.cc

@@ -3,6 +3,7 @@
 #include <cerrno>
 #include <cstring>
 
+#include <absl/strings/ascii.h>
 #include <fcntl.h>
 #include <glog/logging.h>
 #include <sys/socket.h>
@@ -715,7 +716,7 @@ std::exception_ptr RemoteStore::Connection::processStderr(Sink* sink,
     }
 
     else if (msg == STDERR_NEXT) {
-      LOG(ERROR) << chomp(readString(from));
+      LOG(ERROR) << absl::StripTrailingAsciiWhitespace(readString(from));
     }
 
     else if (msg == STDERR_START_ACTIVITY) {

third_party/nix/src/libstore/s3-binary-cache-store.cc

@@ -2,6 +2,7 @@
 
 #include "s3-binary-cache-store.hh"
 
+#include <absl/strings/ascii.h>
 #include <aws/core/Aws.h>
 #include <aws/core/VersionConfig.h>
 #include <aws/core/auth/AWSCredentialsProvider.h>
@@ -50,7 +51,7 @@ class AwsLogger : public Aws::Utils::Logging::FormattedLogSystem {
   using Aws::Utils::Logging::FormattedLogSystem::FormattedLogSystem;
 
   void ProcessFormattedStatement(Aws::String&& statement) override {
-    debug("AWS: %s", chomp(statement));
+    debug("AWS: %s", absl::StripTrailingAsciiWhitespace(statement));
   }
 };
 

third_party/nix/src/libutil/util.cc

@@ -1210,11 +1210,6 @@ string concatStringsSep(const string& sep, const StringSet& ss) {
   return s;
 }
 
-string chomp(const string& s) {
-  size_t i = s.find_last_not_of(" \n\r\t");
-  return i == string::npos ? "" : string(s, 0, i + 1);
-}
-
 string trim(const string& s, const string& whitespace) {
   auto i = s.find_first_not_of(whitespace);
   if (i == string::npos) {

third_party/nix/src/libutil/util.hh

@@ -324,9 +324,6 @@ MakeError(Interrupted, BaseError)
 string concatStringsSep(const string& sep, const Strings& ss);
 string concatStringsSep(const string& sep, const StringSet& ss);
 
-/* Remove trailing whitespace from a string. */
-string chomp(const string& s);
-
 /* Remove whitespace from the start and end of a string. */
 string trim(const string& s, const string& whitespace = " \n\r\t");
 

third_party/nix/src/nix-build/nix-build.cc

@@ -5,6 +5,7 @@
 #include <sstream>
 #include <vector>
 
+#include <absl/strings/ascii.h>
 #include <glog/logging.h>
 
 #include "affinity.hh"
@@ -121,7 +122,7 @@ static void _main(int argc, char** argv) {
         }
         args.clear();
         for (auto line : lines) {
-          line = chomp(line);
+          line = absl::StripTrailingAsciiWhitespace(line);
           std::smatch match;
           if (std::regex_match(line, match,
                                std::regex("^#!\\s*nix-shell (.*)$"))) {

third_party/nix/src/nix-channel/nix-channel.cc

@@ -1,5 +1,6 @@
 #include <regex>
 
+#include <absl/strings/ascii.h>
 #include <fcntl.h>
 #include <pwd.h>
 
@@ -25,7 +26,7 @@ static void readChannels() {
 
   for (const auto& line :
        tokenizeString<std::vector<string>>(channelsFile, "\n")) {
-    chomp(line);
+    absl::StripTrailingAsciiWhitespace(line);
     if (std::regex_search(line, std::regex("^\\s*\\#"))) {
       continue;
     }
@@ -99,7 +100,7 @@ static void update(const StringSet& channelNames) {
     auto dl = getDownloader();
     auto result = dl->downloadCached(store, request);
     auto filename = result.path;
-    url = chomp(result.effectiveUri);
+    url = absl::StripTrailingAsciiWhitespace(result.effectiveUri);
 
     // If the URL contains a version number, append it to the name
     // attribute (so that "nix-env -q" on the channels profile
@@ -136,7 +137,7 @@ static void update(const StringSet& channelNames) {
                                CachedDownloadRequest(url + "/nixexprs.tar.bz2"))
                 .path;
       }
-      chomp(filename);
+      absl::StripTrailingAsciiWhitespace(filename);
     }
 
     // Regardless of where it came from, add the expression representing this

third_party/nix/src/nix/meson.build

@@ -58,7 +58,7 @@ nix_dep_list = [
   libdl_dep,
   libsodium_dep,
   pthread_dep,
-]
+] + absl_deps
 
 nix_link_list = [
   libutil_lib,

third_party/nix/src/nix/repl.cc

@@ -5,6 +5,7 @@
 #include <iostream>
 #include <utility>
 
+#include <absl/strings/ascii.h>
 #include <glog/logging.h>
 
 #ifdef READLINE
@@ -122,7 +123,7 @@ void printHelp() {
 }
 
 string removeWhitespace(string s) {
-  s = chomp(s);
+  s = absl::StripTrailingAsciiWhitespace(s);
   size_t n = s.find_first_not_of(" \n\r\t");
   if (n != string::npos) {
     s = string(s, n);