admin/brew
1
0
Fork 0
Code Issues Packages Projects Releases 6 Wiki Activity

Docs: fix formatting in Formula Cookbook

Browse Source
This commit is contained in:
David Beitey 2019-02-22 00:45:27 +00:00 committed by GitHub
parent d3c0d687cc
commit 833aee53e0
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 2 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
docs/Formula-Cookbook.md
View File

@ -700,9 +700,9 @@ Homebrew provides two formula DSL methods for launchd plist files:
Homebrew has multiple levels of environment variable filtering which affects variables available to formulae. Homebrew has multiple levels of environment variable filtering which affects variables available to formulae.
Firstly, the overall environment in which Homebrew runs is filtered to avoid environment contamination breaking from-source builds (https://github.com/Homebrew/brew/issues/932). In particular, this process filters all but the given whitelisted variables, but allows environment variables prefixed with `HOMEBREW_`. The specific implementation can be seen in [`bin/brew`](https://github.com/Homebrew/brew/blob/master/bin/brew). Firstly, the overall environment in which Homebrew runs is filtered to avoid environment contamination breaking from-source builds (see <https://github.com/Homebrew/brew/issues/932>). In particular, this process filters all but the given whitelisted variables, but allows environment variables prefixed with `HOMEBREW_`. The specific implementation can be seen in [`bin/brew`](https://github.com/Homebrew/brew/blob/master/bin/brew).
The second level of filtering removes sensitive environment variables (such as credentials like keys, passwords or tokens) to avoid malicious subprocesses obtaining them (https://github.com/Homebrew/brew/pull/2524). This has the effect of preventing any such variables from reaching a formula's Ruby code as they are filtered before it is called. The specific implementation can be seen in the [`ENV.clear_sensitive_environment!` method](https://github.com/Homebrew/brew/blob/master/Library/Homebrew/extend/ENV.rb). The second level of filtering removes sensitive environment variables (such as credentials like keys, passwords or tokens) to avoid malicious subprocesses obtaining them (see <https://github.com/Homebrew/brew/pull/2524>). This has the effect of preventing any such variables from reaching a formula's Ruby code as they are filtered before it is called. The specific implementation can be seen in the [`ENV.clear_sensitive_environment!` method](https://github.com/Homebrew/brew/blob/master/Library/Homebrew/extend/ENV.rb).
In summary, environment variables used by a formula need to conform to these filtering rules in order to be available. In summary, environment variables used by a formula need to conform to these filtering rules in order to be available.