Cannot open file using root:// from compiled standalone executable

Dear ROOTers

I am new here and to be honest I do not know am I posting in correct category or not, but I hope you will forgive me that for a first time :slight_smile: :slight_smile: , post will be little long. This is my first post here, usually reading was enough for me to solve some problems.

I have a little problem when I am trying to use path to file like this

root:// ....

Reading and analyzing file containing root tree using compiled standalone executable. Path to the file I have in separate .list file, piece of code opening .list file and then opening root file is below

    while (input >> fileName ){
      if(fileName.c_str()[0]=='#') continue;
      if(fileName.c_str()[0]=='*') break;

    for(int i=0;i<input_file_names.size();i++){
      TFile *f = (TFile*)gROOT->GetListOfFiles()->FindObject(input_file_names[i].c_str());
      if (!f || !f->IsOpen()) {
	     f = new TFile(input_file_names[i].c_str(),"READ");

Makefile to compile the code is simple, but code is long and not posting here whole code


R_LDFLAGS=`root-config --ldflags`
R_LIBS=`root-config --libs`
R_CFLAGS=`root-config --cflags`

        $(CC)  $(CFLAGS)  MyAna.C MyMuMu.o -o MyAnalysis $(R_ALL) $(LIBS)

When I am mounting

sshfs /disk1/eos

and then using .list file where the path to .root file is like that


Everything is fine. Opening and reading file with no problem

After that I decided to read the file using these format


Installed eos, (system says new users can not include links) There are instructions how to install eos on ubuntu)

Installed xrootd version v5.5.0

aliko@pc-iowaa1:~/HmmAnalysis$ xrootd -v

xrdcp works perfectly, copies files to/from with no problem

I can access eos , checking file - it is there and is online

aliko@pc-iowaa1:~/HmmAnalysis$ eos root://
# ---------------------------------------------------------------------------
# EOS  Copyright (C) 2011-2020 CERN/Switzerland
# This program comes with ABSOLUTELY NO WARRANTY; for details type `license'.
# This is free software, and you are welcome to redistribute it 
# under certain conditions; type `license' for details.
# ---------------------------------------------------------------------------
EOS Console [root://] |/eos/cms/store/user/amestvir/SingleMuon_Run2016B-ver1_HIPM_UL2016_MiniAODv2_NanoAODv9-v2_NANOAOD/> ls
EOS Console [root://] |/eos/cms/store/user/amestvir/SingleMuon_Run2016B-ver1_HIPM_UL2016_MiniAODv2_NanoAODv9-v2_NANOAOD/> file info BB6DC570-2223-7B43-BB87-2526FB1639B4.root
  File: '/eos/cms/store/user/amestvir/SingleMuon_Run2016B-ver1_HIPM_UL2016_MiniAODv2_NanoAODv9-v2_NANOAOD/BB6DC570-2223-7B43-BB87-2526FB1639B4.root'  Flags: 0644
  Size: 1089283188
Status: healthy
Modify: Tue Nov 15 10:52:52 2022 Timestamp: 1668505972.096425000
Change: Tue Nov 15 10:53:36 2022 Timestamp: 1668506016.013357612
 Birth: Tue Nov 15 10:52:43 2022 Timestamp: 1668505963.248177316
  CUid: 12218 CGid: 1399 Fxid: e4f68a53 Fid: 3841362515 Pid: 112550745 Pxid: 06b56359
XStype: adler    XS: d3 8c f6 7f    ETAGs: "1031157898375331840:d38cf67f"
Layout: replica Stripes: 2 Blocksize: 4k LayoutId: 00600112 Redundancy: d2::t0 
  #Rep: 2
?no.? fs-id?                    host?      schedgroup?            path?      boot?  configstatus?       drain?  active?                       geotag?
 0    29243       default.60          /data95     booted             rw      nodrain   online 68a8c9fc::0513::S::0034::SE12 
 1    27871       default.60          /data32     booted             rw      nodrain   online f3b0d31b::0513::S::0034::SL13 

EOS Console [root://] |/eos/cms/store/user/amestvir/SingleMuon_Run2016B-ver1_HIPM_UL2016_MiniAODv2_NanoAODv9-v2_NANOAOD/>

Accessing the file from root using

root root://

No problem, fine

but when I am running like this

aliko@pc-iowaa1:~/HmmAnalysis$ MyAnalysis realEOS.list

Requested 500000 events
Histograms booked
Wed 16 Nov 2022 10:18:40 AM CET

 ***** 1 data files in realEOS.list file *****

Error in <TFile::TFile>: file /eos/cms/store/user/amestvir/SingleMuon_Run2016B-ver1_HIPM_UL2016_MiniAODv2_NanoAODv9-v2_NANOAOD/BB6DC570-2223-7B43-BB87-2526FB1639B4.root does not exist

In the file realEOS.list there is one line


I used like this

root:// ....

or like this

root:// ....

But nothing helps. Needless to say, that all above writing of root://eoscms … works perfectly from just root.

Voms is installed and creates valid proxy, but some error messages, namely verification error

aliko@pc-iowaa1:~/HmmAnalysis$  voms-proxy-init --voms cms
Enter GRID pass phrase:
Your identity: /DC=ch/DC=cern/OU=Organic Units/OU=Users/CN=amestvir/CN=456424/CN=Alexi Mestvirishvili
Creating temporary proxy ............................. Done
Contacting [/DC=ch/DC=cern/OU=computers/] "cms" Failed

Error: Server Answer was incorrectly formatted.

Trying next server for cms.
Creating temporary proxy ......................................................... Done
Contacting [/DC=ch/DC=cern/OU=computers/] "cms" Done
Creating proxy ........................................................................ Done

Your proxy is valid until Wed Nov 16 22:26:06 2022
Error: verification failed.
Cannot verify AC signature!

Here are some verification errors, but in one of the discussions I found, that this error message could be ignored. Unfortunately I can not find this discussions again

I do not know what to do more. I believe solution is something simple. May be I am not linking some libs? But no error at the linking stage

Am I using not compatible with each other versions of software?

Any suggestions or help is appreciated

Obviously simplest solution is to run how it works and do not bother myself using the path like this


But I want to use it like this !!!

:slight_smile: :slight_smile:

ROOT Version: 6.24/02
Platform: Ubuntu 20.4 LTE

 g++ -v
Using built-in specs.
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu 9.4.0-1ubuntu1~20.04.1' --with-bugurl=file:///usr/share/doc/gcc-9/README.Bugs --enable-languages=c,ada,c++,go,brig,d,fortran,objc,obj-c++,gm2 --prefix=/usr --with-gcc-major-version-only --program-suffix=-9 --program-prefix=x86_64-linux-gnu- --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --libdir=/usr/lib --enable-nls --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --with-default-libstdcxx-abi=new --enable-gnu-unique-object --disable-vtable-verify --enable-plugin --enable-default-pie --with-system-zlib --with-target-system-zlib=auto --enable-objc-gc=auto --enable-multiarch --disable-werror --with-arch-32=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32 --enable-multilib --with-tune=generic --enable-offload-targets=nvptx-none=/build/gcc-9-Av3uEd/gcc-9-9.4.0/debian/tmp-nvptx/usr,hsa --without-cuda-driver --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu
Thread model: posix
gcc version 9.4.0 (Ubuntu 9.4.0-1ubuntu1~20.04.1)

Hi @amestvir ,

congrats on your first post – it’s a very good post :smiley: Instead of new TFile(...) you need TFile::Open(...). Ideally the error message would tell you, as suggested in TFile's ctor's error message should point to TFile::Open when filename contains "://" · Issue #10039 · root-project/root · GitHub . cc: @pcanal .


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As I said , something simple :slight_smile: :slight_smile: . Thanks a lot, Enirco


Work in progress here: [IO] Improve error message when no TFile::Open for remote files by eguiraud · Pull Request #11719 · root-project/root · GitHub

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