fix duplicate import of global var path in symlink file

[IfanTsai]

eg. main.go -> cmd/myproject/run.go

When run goc build ., redeclared error will be reported.
In main.go, the global var path is duplicated imported as follows:
package main; import . "myproject/src/gocbuild235e80d276dc"; import . "myproject/src/gocbuild234e80d276dc"

These two files treaded as two unrelated files in result of go list command, so goc imports the global var package twice.

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[IfanTsai]

/assign @CarlJi

[codecov]

Codecov Report

Merging #351 (6db3b82) into master (5b2b15a) will increase coverage by 0.09%.
Report is 1 commits behind head on master.
The diff coverage is n/a.

❗ Current head 6db3b82 differs from pull request most recent head bccdb98. Consider uploading reports for the commit bccdb98 to get more accurate results

Additional details and impacted files

@@ Coverage Diff @@ ## master #351 +/- ## ========================================== + Coverage 70.61% 70.71% +0.09%  ========================================== Files 34 34 Lines 2042 2042 ========================================== + Hits 1442 1444 +2  + Misses 488 486 -2  Partials 112 112 

Flag	Coverage Δ
e2e-1.16.x	?
e2e-1.17.x	?
e2e-1.18.x	?
e2e-1.19.x	?
unittest-1.16.x	70.61% <ø> (ø)
unittest-1.17.x	70.51% <ø> (ø)
unittest-1.18.x	70.51% <ø> (-0.10%)	⬇️
unittest-1.19.x	70.61% <ø> (+0.09%)	⬆️

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see 1 file with indirect coverage changes

[CarlJi]

Hi @IfanTsai, I'm a bit confused about what you're referring to. Could you please provide a more complete example to clarify your request?

[IfanTsai]

Hi @CarlJi, here is our project structure demo:

├── main.go -> cmd/my_project/run.go ├── internal ├── pkg └── web ├── handlers │   ├── user.go │   ├── goods.go └── router.go 

main.go in the root directory is actually a soft link to cmd/my_project/run.go. The default directory structure generated by our scaffolding like this. The go list command line treats main.go and cmd/my_project_run.go as they are two unrelated files, causing the goc to import global var path repeatedly in main.go, such as follows in /tmp/goc-build-87f625d33029/main.go:

package main; import . "my_project/src/gocbuild87f625d33029"; import . "my_project/src/gocbuild87f625d33029"

This PR can ensure only once import, such as follows in /tmp/goc-build-87f625d33029/main.go:

package main; import . "my_project/src/gocbuild87f625d33029";

[CarlJi]

@IfanTsai Apologies for the delayed reply, the code LGTM, i will proceed with merging it

[CarlJi]

/lgtm
/approve

[qiniu-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: CarlJi, IfanTsai

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