Precompile of Requests failing in Julia 0.4.2

[IanButterworth]

I'm trying to load the following but I get stuck at Requests and hit the error below. DataStructures also gives me the same error if I reorder them in the using instruction
Any ideas?

using Compat, Requests, DataStructures, JSON, PyPlot, LsqFit, HypothesisTests

error:

INFO: Precompiling module Requests...
INFO: Recompiling stale cache file /opt/julia_packages/.julia/lib/v0.4/URIParser.ji for module URIParser.
ERROR: LoadError: unlink: read-only file system (EROFS)
in unlink at fs.jl:102
in rm at file.jl:59
in create_expr_cache at loading.jl:330
in recompile_stale at loading.jl:461
in _require_from_serialized at loading.jl:83
in _require_from_serialized at ./loading.jl:109
in require at ./loading.jl:219
in include at ./boot.jl:261
in include_from_node1 at ./loading.jl:304
[inlined code] from none:2
in anonymous at no file:0
in process_options at ./client.jl:257
in _start at ./client.jl:378
while loading /home/juser/.julia/v0.4/Requests/src/Requests.jl, in expression starting on line 11

[tanmaykm]

Likely not a JuliaBox issue. This is what I see:

juser@juliabox:~$ /opt/julia-0.4/bin/julia                                                                                                                                                                                                
               _
   _       _ _(_)_     |  A fresh approach to technical computing                                                                                                                                                                         
  (_)     | (_) (_)    |  Documentation: http://docs.julialang.org                                                                                                                                                                        
   _ _   _| |_  __ _   |  Type "?help" for help.                                                                                                                                                                                          
  | | | | | | |/ _` |  |                                                                                                                                                                                                                  
  | | |_| | | | (_| |  |  Version 0.4.2 (2015-12-06 21:47 UTC)                                                                                                                                                                            
 _/ |\__'_|_|_|\__'_|  |  Official http://julialang.org/ release                                                                                                                                                                          
|__/                   |  x86_64-unknown-linux-gnu                                                                                                                                                                                        

julia> using Compat, Requests, DataStructures, JSON                                                                                                                                                                                       
INFO: Precompiling module Requests...                                                                                                                                                                                                     
INFO: Precompiling module DataStructures...                                                                                                                                                                                               

julia>                                                                                                                                                                                                                                          

[IanButterworth]

Copying your check approach, I get the error. Could it be some irregularity in write permissions in my juliabox session? Or perhaps a space quota has been met? (my jb folder itself has very little data in it, but I don't know about temp files)
thanks

juser@juliabox:~$ /opt/julia-0.4/bin/julia                                                                                                                                      
INFO: Recompiling stale cache file /opt/julia_packages/.julia/lib/v0.4/Compat.ji for module Compat.                                                                             
               _
   _       _ _(_)_     |  A fresh approach to technical computing
  (_)     | (_) (_)    |  Documentation: http://docs.julialang.org
   _ _   _| |_  __ _   |  Type "?help" for help.
  | | | | | | |/ _` |  |
  | | |_| | | | (_| |  |  Version 0.4.2 (2015-12-06 21:47 UTC)
 _/ |\__'_|_|_|\__'_|  |  Official http://julialang.org/ release
|__/                   |  x86_64-unknown-linux-gnu

julia> using Compat, Requests, DataStructures, JSON                                                                                                                             
INFO: Recompiling stale cache file /opt/julia_packages/.julia/lib/v0.4/Compat.ji for module Compat.                                                                             
ERROR: unlink: read-only file system (EROFS)                                                                                                                                    
 in unlink at fs.jl:102                                                                                                                                                         
 in rm at file.jl:59                                                                                                                                                            
 in create_expr_cache at loading.jl:330                                                                                                                                         
 in recompile_stale at loading.jl:461                                                                                                                                           
 in _require_from_serialized at loading.jl:83                                                                                                                                   
 in _require_from_serialized at ./loading.jl:109                                                                                                                                
 in require at ./loading.jl:219   

julia>

[tanmaykm]

I'm not sure why it's trying to update /opt/julia_packages/.julia/lib/v0.4/Compat.ji. Shouldn't it be ~/.julia/lib/v0.4/Compat.ji?

Probably there are some locally installed packages that are stale? Does it help if you remove your locally installed packages?

mv ~/.julia ~/bkup

[IanButterworth]

I removed locally installed packages and the issue went away, but I've figured out it returns after I add PyPlot.

using Compat, Requests, DataStructures, JSON

INFO: Precompiling module Requests...
INFO: Precompiling module DataStructures...

Pkg.add("PyPlot")
using Compat, Requests, DataStructures, JSON

INFO: Precompiling module Requests...
INFO: Recompiling stale cache file /opt/julia_packages/.julia/lib/v0.4/URIParser.ji for module URIParser.
ERROR: LoadError: unlink: read-only file system (EROFS)
 in unlink at fs.jl:102
 in rm at file.jl:59
 in create_expr_cache at loading.jl:330
 in recompile_stale at loading.jl:461
 in _require_from_serialized at loading.jl:83
 in _require_from_serialized at ./loading.jl:109
 in require at ./loading.jl:219
 in include at ./boot.jl:261
 in include_from_node1 at ./loading.jl:304
 [inlined code] from none:2
 in anonymous at no file:0
 in process_options at ./client.jl:257
 in _start at ./client.jl:378
while loading /opt/julia_packages/.julia/v0.4/Requests/src/Requests.jl, in expression starting on line 11

Edit: I've posted this to the PyPlot github

[ghost]

i have the exact same problem.

[stevengj]

The problem seems to be that JuliaBox ships some precompiled cache files in a read-only directory /opt/julia_packages/.julia/lib/v0.4. If at some point it detects that the cache is stale and tries to recompile it, it fails.

This needs to be fixed in Julia itself—it shouldn't try to delete cache files from a read-only directory when recompiling.

Update: I've filed a Julia issue, see the link below:

[stevengj]

A workaround is to add

splice!(Base.LOAD_CACHE_PATH, 3)

to your .juliarc file on JuliaBox to remove the read-only cache directory from the search path. Or just run this manually before typing using Compat etc to rebuild the cache without using the read-only search path.

[IanButterworth]

Thanks. The suggested workaround works for 0.4.2 (using echo 'splice!(Base.LOAD_CACHE_PATH, 3)' > ~/.juliarc.jl to insert the line into juliarc)

But apparently LOAD_CACHE_PATH isn't defined on launching Julia 0.3.12 so this fails

[stevengj]

@ianshmean, just do VERSION >= v"0.4" && splice!(Base.LOAD_CACHE_PATH, 3)

[IanButterworth]

Fantastic, that works. Thanks.

[tanmaykm]

Thanks @stevengj for looking into it.

[tanmaykm]

Closed via JuliaLang/julia#14368
JuliaBox will have it with the next backport