Add support for /etc/apt/auth.conf.d/*.conf (netrcparts)

This allows us to install matching auth files for sources.list.d
files, for example; very useful.

This converts aptmethod's authfd from one FileFd to a vector of
pointers to FileFd, as FileFd cannot be copied, and move operators
are hard.

(parts cherry-picked from commit feed3ec105cd6be7b5d23da14c6cfca8572ee725)
LP: #1811120

TODO: test/integration/test-authentication-basic is missing, what to do?

3 files changed, 51 insertions, 0 deletions

diff --git a/methods/ftp.cc b/methods/ftp.cc
index 66787a7be..5bcdfd803 100644
--- a/methods/ftp.cc
+++ b/methods/ftp.cc
@@ -994,6 +994,23 @@ bool FtpMethod::Fetch(FetchItem *Itm)
    Res.IMSHit = false;
 
    maybe_add_auth (Get, _config->FindFile("Dir::Etc::netrc"));
+   if(Get.User.empty() || Get.Password.empty())
+   {
+      std::string const netrcparts = _config->FindDir("Dir::Etc::netrcparts");
+      if (not netrcparts.empty())
+      {
+	 _error->PushToStack();
+	 std::vector<std::string> files = GetListOfFilesInDir(netrcparts, "conf", true, true);
+	 for (std::vector<std::string>::const_iterator netrc = files.begin(); netrc != files.end(); netrc++)
+	 {
+	    maybe_add_auth (Get, *netrc);
+	    if (Get.User.empty() == false || Get.Password.empty() == false)
+	       break;
+	 }
+	 _error->RevertToStack();
+      }
+   }
+
 
    // Connect to the server
    if (Server == 0 || Server->Comp(Get) == false)
diff --git a/methods/http.cc b/methods/http.cc
index d3a5d718f..5f5cd2631 100644
--- a/methods/http.cc
+++ b/methods/http.cc
@@ -758,7 +758,25 @@ void HttpMethod::SendReq(FetchItem *Itm)
       Req += string("Proxy-Authorization: Basic ") + 
           Base64Encode(Server->Proxy.User + ":" + Server->Proxy.Password) + "\r\n";
 
+
    maybe_add_auth (Uri, _config->FindFile("Dir::Etc::netrc"));
+   if(Uri.User.empty() || Uri.Password.empty())
+   {
+      std::string const netrcparts = _config->FindDir("Dir::Etc::netrcparts");
+      if (not netrcparts.empty())
+      {
+	 _error->PushToStack();
+	 std::vector<std::string> files = GetListOfFilesInDir(netrcparts, "conf", true, true);
+	 for (std::vector<std::string>::const_iterator netrc = files.begin(); netrc != files.end(); netrc++)
+	 {
+	    maybe_add_auth (Uri, *netrc);
+	    if (Uri.User.empty() == false || Uri.Password.empty() == false)
+	       break;
+	 }
+	 _error->RevertToStack();
+      }
+   }
+
    if (Uri.User.empty() == false || Uri.Password.empty() == false)
    {
       Req += string("Authorization: Basic ") + 
diff --git a/methods/https.cc b/methods/https.cc
index 087604b6d..dd678ca7f 100644
--- a/methods/https.cc
+++ b/methods/https.cc
@@ -177,6 +177,22 @@ bool HttpsMethod::Fetch(FetchItem *Itm)
    SetupProxy();
 
    maybe_add_auth (Uri, _config->FindFile("Dir::Etc::netrc"));
+   if(Uri.User.empty() || Uri.Password.empty())
+   {
+      std::string const netrcparts = _config->FindDir("Dir::Etc::netrcparts");
+      if (not netrcparts.empty())
+      {
+	 _error->PushToStack();
+	 std::vector<std::string> files = GetListOfFilesInDir(netrcparts, "conf", true, true);
+	 for (std::vector<std::string>::const_iterator netrc = files.begin(); netrc != files.end(); netrc++)
+	 {
+	    maybe_add_auth (Uri, *netrc);
+	    if (Uri.User.empty() == false || Uri.Password.empty() == false)
+	       break;
+	 }
+	 _error->RevertToStack();
+      }
+   }
 
    // callbacks
    curl_easy_setopt(curl, CURLOPT_URL, static_cast<string>(Uri).c_str());