Permission denied, when installing a new gem - ruby

Question

I am in Windows 7, I can see that all my gems are in :
C:\Users\alotfi2.gem\specs\api.rubygems.org%443\quick\Marshal.4.8
Last week we received an email from the admin that said :
After migration, your H: drive will be read-only. This means you'll be able to access and transfer your files but you won't be able to edit them or save any new files to your H: drive.
but when I tried to install a new gem I got :
gem install chronic
ERROR: While executing gem ... (Errno::EACCES)
Permission denied # rb_sysopen - H:/.gem/specs/api.rubygems.org%443/quick/Marshal.4.8/chronic-0.10.2.gemspec
gem environment
RubyGems Environment:
- RUBYGEMS VERSION: 2.3.0
- RUBY VERSION: 2.4.2 (2017-09-14 patchlevel 198) [x64-mingw32]
- INSTALLATION DIRECTORY: C:/Ruby24-x64/lib/ruby/gems/2.4.0
- RUBY EXECUTABLE: C:/Ruby24-x64/bin/ruby.exe
- EXECUTABLE DIRECTORY: C:/Ruby24-x64/bin
- SPEC CACHE DIRECTORY: H:/.gem/specs
- SYSTEM CONFIGURATION DIRECTORY: C:/ProgramData
- RUBYGEMS PLATFORMS:
- ruby
- x64-mingw32
- GEM PATHS:
- C:/Ruby24-x64/lib/ruby/gems/2.4.0
- H:/.gem/ruby/2.4.0
- GEM CONFIGURATION:
- :update_sources => true
- :verbose => true
- :backtrace => false
- :bulk_threshold => 1000
- REMOTE SOURCES:
- https://rubygems.org/
- SHELL PATH:
- C:\majid\cmder\bin
- C:\majid\cmder\vendor\git-for-windows\cmd
- C:\majid\cmder\vendor\conemu-maximus5\ConEmu\Scripts
- C:\majid\cmder\vendor\conemu-maximus5
- C:\majid\cmder\vendor\conemu-maximus5\ConEmu
- C:\Program Files (x86)\Shoes
- C:\Ruby24-x64\bin
- C:\Users\alotfi2\AppData\Local\Programs\Python\Python36-32\Scripts\
- C:\Users\alotfi2\AppData\Local\Programs\Python\Python36-32\
- C:\Users\alotfi2\AppData\Roaming\npm
- C:\Program Files\Docker Toolbox
- C:\majid\cmder\vendor\git-for-windows\usr\bin
- C:\majid\cmder\vendor\git-for-windows\usr\share\vim\vim74
- C:\majid\cmder\
your help is appreciated .
Thanks.

Answer 1

Your SPEC CACHE DIRECTORY still links to your H: drive, to change its value, you have to set environment variable GEM_SPEC_CACHE as stated in this thread.
To do so on Windows, you would want to use SetX command. For example:
SETX GEM_SPEC_CACHE C:\Users\User\.gem\abc
You should have writing access rights to directory C:\Users\User\.gem\abc for it to work.