git-upgrade fails if email is not set global for git

[voxspox]

Is this a bug report?

yes

Have you read the Contributing Guidelines?

no

Environment

Environment:
OS: Linux 4.13
Node: 9.5.0
Yarn: Not Found
npm: 5.6.0
Watchman: Not Found
Xcode: N/A
Android Studio: 3.0 AI-171.4443003

Packages: (wanted => installed)
react: ^16.2.0 => 16.2.0
react-native: ^0.53.2 => 0.53.2

Steps to Reproduce

1. Do not setup your email for git globally
2. But do setup your git email for the local project
3. run react-native-git-upgrade

Expected Behavior

no errors

Actual Behavior

$ git commit -m "Project snapshot"
On branch master
nothing to commit, working directory clean
$ react-native-git-upgrade 
git-upgrade info Check for updates 
...
git-upgrade info Add all files to commit 
git-upgrade info Commit current project sources 

*** Please tell me who you are.
Run
git config --global user.email "you@example.com"
git config --global user.name "Your Name"

to set your account's default identity.
Omit --global to set the identity only in this repository.

fatal: unable to auto-detect email address (got 'locus@cobalt.(none)')
git-upgrade ERR! An error occurred during upgrade: 
git-upgrade ERR! Error: Command 'git commit -m "Project snapshot"' exited with code 128:
stderr: undefined
...

If I setup my email per git config --global user.email ... there are no errors.

It seems that git runs within react-native-git-upgrade differently compared to in the shell.

[stale]

Hey there, it looks like there has been no activity on this issue recently. Has the issue been fixed, or does it still require the community's attention? This issue may be closed if no further activity occurs. You may also label this issue as "For Discussion" or "Good first issue" and I will leave it open. Thank you for your contributions.

[stale]

Hey there, it looks like there has been no activity on this issue recently. Has the issue been fixed, or does it still require the community's attention? This issue may be closed if no further activity occurs. You may also label this issue as "For Discussion" or "Good first issue" and I will leave it open. Thank you for your contributions.

[voxspox]

This is still an issue

[stale]

Hey there, it looks like there has been no activity on this issue recently. Has the issue been fixed, or does it still require the community's attention? This issue may be closed if no further activity occurs. You may also label this issue as "For Discussion" or "Good first issue" and I will leave it open. Thank you for your contributions.

[voxspox]

ok. I found out what is the problem:

react-native-git-upgrade creates a temporary git repository. Therefore the default email is used. If it is not set the described malicious behavior occurs.

[hramos]

The command line tools have their own repository and issue tracker over at https://github.com/react-native-community/react-native-cli.

[grabbou]

Reopening, since "react-native-git-upgrade" is still part of this repository.