Unable to link dependency 'psycopg2' because a file by the same name exists in this service

[Mortinke]

Currently I use the version v3.0.0-beta.4 to fix #72.

Unfortunaly, I run in the next issue and get now the following error:

$ SLS_DEBUG=1 serverless deploy -s dev -r eu-central-1 -v
Serverless: Installing required Python packages for runtime python2.7...
Serverless: Linking required Python packages...

  Error --------------------------------------------------

  Unable to link dependency 'psycopg2' because a file by the same name exists in this service

     For debugging logs, run again after setting the "SLS_DEBUG=*" environment variable.

  Stack Trace --------------------------------------------

Error: Unable to link dependency 'psycopg2' because a file by the same name exists in this service
    at fse.readdirSync.map.e (D:\Workspace\git\aws.cloudformation.utils\node_modules\serverless-python-requirements\index.js:213:21)
    at Array.map (native)
    at ServerlessPythonRequirements.linkRequirements (D:\Workspace\git\aws.cloudformation.utils\node_modules\serverless-python-requirements\index.js:198:40)
From previous event:
    at PluginManager.invoke (C:\Users\sebastian.martinka\AppData\Roaming\npm\node_modules\serverless\lib\classes\PluginManager.js:217:22)
    at PluginManager.spawn (C:\Users\sebastian.martinka\AppData\Roaming\npm\node_modules\serverless\lib\classes\PluginManager.js:229:17)
    at Deploy.BbPromise.bind.then.then (C:\Users\sebastian.martinka\AppData\Roaming\npm\node_modules\serverless\lib\plugins\deploy\deploy.js:101:50)
From previous event:
    at Object.before:deploy:deploy [as hook] (C:\Users\sebastian.martinka\AppData\Roaming\npm\node_modules\serverless\lib\plugins\deploy\deploy.js:99:10)
    at BbPromise.reduce (C:\Users\sebastian.martinka\AppData\Roaming\npm\node_modules\serverless\lib\classes\PluginManager.js:217:55)
From previous event:
    at PluginManager.invoke (C:\Users\sebastian.martinka\AppData\Roaming\npm\node_modules\serverless\lib\classes\PluginManager.js:217:22)
    at PluginManager.run (C:\Users\sebastian.martinka\AppData\Roaming\npm\node_modules\serverless\lib\classes\PluginManager.js:236:17)
    at variables.populateService.then (C:\Users\sebastian.martinka\AppData\Roaming\npm\node_modules\serverless\lib\Serverless.js:107:33)
    at runCallback (timers.js:672:20)
    at tryOnImmediate (timers.js:645:5)
    at processImmediate [as _immediateCallback] (timers.js:617:5)
From previous event:
    at Serverless.run (C:\Users\sebastian.martinka\AppData\Roaming\npm\node_modules\serverless\lib\Serverless.js:94:74)
    at serverless.init.then (C:\Users\sebastian.martinka\AppData\Roaming\npm\node_modules\serverless\bin\serverless:32:50)

  Get Support --------------------------------------------
     Docs:          docs.serverless.com
     Bugs:          github.com/serverless/serverless/issues
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  Your Environment Information -----------------------------
     OS:                     win32
     Node Version:           6.10.3
     Serverless Version:     1.17.0

serverless.yml

custom:
  pythonRequirements:
    pythonBin: C:\Python\Python2.7\python.exe
package: # this section is optional, but suggested. It reduces deploy size
  exclude:
    - node_modules/**  # Omit JavaScript dependencies, you're using Python!!
    - venv/**  # Omit your virtualenv if you've created one locally for development
plugins:
  - serverless-python-requirements

requirements.txt

cat requirements.txt
psycopg2==2.7.3.1

npm

$ npm list
aws.cloudformation.utils@1.0.0 D:\Workspace\git\aws.cloudformation.utils
`-- serverless-python-requirements@3.0.0-beta.4
  +-- archiver@1.3.0
  | +-- archiver-utils@1.3.0
  | | +-- lazystream@1.0.0
  | | `-- normalize-path@2.1.1
  | |   `-- remove-trailing-separator@1.1.0
  | +-- async@2.5.0
  | +-- buffer-crc32@0.2.13
  | +-- glob@7.1.2
  | | +-- fs.realpath@1.0.0
  | | +-- inflight@1.0.6
  | | | `-- wrappy@1.0.2
  | | +-- inherits@2.0.3
  | | +-- minimatch@3.0.4
  | | | `-- brace-expansion@1.1.8
  | | |   +-- balanced-match@1.0.0
  | | |   `-- concat-map@0.0.1
  | | +-- once@1.4.0
  | | `-- path-is-absolute@1.0.1
  | +-- readable-stream@2.3.3
  | | +-- core-util-is@1.0.2
  | | +-- isarray@1.0.0
  | | +-- process-nextick-args@1.0.7
  | | +-- safe-buffer@5.1.1
  | | +-- string_decoder@1.0.3
  | | `-- util-deprecate@1.0.2
  | +-- tar-stream@1.5.4
  | | +-- bl@1.2.1
  | | +-- end-of-stream@1.4.0
  | | `-- xtend@4.0.1
  | +-- walkdir@0.0.11
  | `-- zip-stream@1.2.0
  |   `-- compress-commons@1.2.0
  |     `-- crc32-stream@2.0.0
  |       `-- crc@3.4.4
  +-- bluebird@3.5.0
  +-- fs-extra@3.0.1
  | +-- graceful-fs@4.1.11
  | +-- jsonfile@3.0.1
  | `-- universalify@0.1.1
  +-- glob-all@3.1.0
  | `-- yargs@1.2.6
  |   `-- minimist@0.1.0
  `-- lodash@4.17.4

[Mortinke]

I added console.log(exception) and console.log(e) after the lines 205 and 209 and found out, that I ran in this issues: nodejs/node-v0.x-archive#6342

https://github.com/UnitedIncome/serverless-python-requirements/blob/1f5b72cb32e196865e61ef3cf187a8f327060f80/index.js#L203-L216

Here you can find the error messages I got

{ Error: EPERM: operation not permitted, symlink '.requirements\psycopg2' -> 'D:\Workspace\git\aws.cloudformation.utils\psycopg2'
    at Error (native)
    at Object.fs.symlinkSync (fs.js:1068:18)
    at fse.readdirSync.map.e (D:\Workspace\git\aws.cloudformation.utils\node_modules\serverless-python-requirements\index.js:204:15)
    at Array.map (native)
    at ServerlessPythonRequirements.linkRequirements (D:\Workspace\git\aws.cloudformation.utils\node_modules\serverless-python-requirements\index.js:198:40)
    at ServerlessPythonRequirements.tryCatcher (D:\Workspace\git\aws.cloudformation.utils\node_modules\bluebird\js\release\util.js:16:23)
    at Promise._settlePromiseFromHandler (D:\Workspace\git\aws.cloudformation.utils\node_modules\bluebird\js\release\promise.js:512:31)
    at Promise._settlePromise (D:\Workspace\git\aws.cloudformation.utils\node_modules\bluebird\js\release\promise.js:569:18)
    at Promise._settlePromise0 (D:\Workspace\git\aws.cloudformation.utils\node_modules\bluebird\js\release\promise.js:614:10)
    at Promise._settlePromises (D:\Workspace\git\aws.cloudformation.utils\node_modules\bluebird\js\release\promise.js:693:18)
    at Async._drainQueue (D:\Workspace\git\aws.cloudformation.utils\node_modules\bluebird\js\release\async.js:133:16)
    at Async._drainQueues (D:\Workspace\git\aws.cloudformation.utils\node_modules\bluebird\js\release\async.js:143:10)
    at Immediate.Async.drainQueues (D:\Workspace\git\aws.cloudformation.utils\node_modules\bluebird\js\release\async.js:17:14)
    at runCallback (timers.js:672:20)
    at tryOnImmediate (timers.js:645:5)
    at processImmediate [as _immediateCallback] (timers.js:617:5)
  errno: -4048,
  code: 'EPERM',
  syscall: 'symlink',
  path: '.requirements\\psycopg2',
  dest: 'D:\\Workspace\\git\\aws.cloudformation.utils\\psycopg2' }
{ Error: ENOENT: no such file or directory, readlink 'D:\Workspace\git\aws.cloudformation.utils\psycopg2'
    at Error (native)
    at Object.fs.readlinkSync (fs.js:1028:18)
    at fse.readdirSync.map.e (D:\Workspace\git\aws.cloudformation.utils\node_modules\serverless-python-requirements\index.js:209:28)
    at Array.map (native)
    at ServerlessPythonRequirements.linkRequirements (D:\Workspace\git\aws.cloudformation.utils\node_modules\serverless-python-requirements\index.js:198:40)
    at ServerlessPythonRequirements.tryCatcher (D:\Workspace\git\aws.cloudformation.utils\node_modules\bluebird\js\release\util.js:16:23)
    at Promise._settlePromiseFromHandler (D:\Workspace\git\aws.cloudformation.utils\node_modules\bluebird\js\release\promise.js:512:31)
    at Promise._settlePromise (D:\Workspace\git\aws.cloudformation.utils\node_modules\bluebird\js\release\promise.js:569:18)
    at Promise._settlePromise0 (D:\Workspace\git\aws.cloudformation.utils\node_modules\bluebird\js\release\promise.js:614:10)
    at Promise._settlePromises (D:\Workspace\git\aws.cloudformation.utils\node_modules\bluebird\js\release\promise.js:693:18)
    at Async._drainQueue (D:\Workspace\git\aws.cloudformation.utils\node_modules\bluebird\js\release\async.js:133:16)
    at Async._drainQueues (D:\Workspace\git\aws.cloudformation.utils\node_modules\bluebird\js\release\async.js:143:10)
    at Immediate.Async.drainQueues (D:\Workspace\git\aws.cloudformation.utils\node_modules\bluebird\js\release\async.js:17:14)
    at runCallback (timers.js:672:20)
    at tryOnImmediate (timers.js:645:5)
    at processImmediate [as _immediateCallback] (timers.js:617:5)
  errno: -4058,
  code: 'ENOENT',
  syscall: 'readlink',
  path: 'D:\\Workspace\\git\\aws.cloudformation.utils\\psycopg2' }

I fixed the issue with this instruction.

[dschep]

Hrm. I had considered switching to copy instead of symlink on win32 platforms. Does that seem like a good idea?

[Mortinke]

Yes, I think that it's a good idea! Not everyone will have the opportunity to modify the group polices in the company.

[nthienan]

@dschep, @Mortinke, Is there any other workaround? My computer is in company and I don't have permission to change group polices

[Mortinke]

Hi @nthienan,

sorry, but I still use the solution from instruction. I think the only other possible solution is the change to copy, mentioned by @dschep.

[dschep]

I just setup windows builds last week so I should be able test this now so I'll build it when I get the chance.