environment variables section

environment/environment.md

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+!SLIDE
+
+# Environment Variables #
+
+!SLIDE 
+
+## moving around your git pieces ##
+
+!SLIDE bullets incremental
+
+* git directory
+* index file
+* working directory
+
+!SLIDE code
+
+# GIT_DIR #
+
+!SLIDE commandline incremental
+
+	$ mv .git /opt/repo.git
+
+	$ git --git-dir=/opt/repo.git log
+
+	$ export GIT_DIR=/opt/repo.git
+	$ git log
+
+!SLIDE code
+
+# GIT_INDEX_FILE #
+
+!SLIDE commandline incremental
+
+	$ git status -s
+	 M README
+	 M kidgloves.rb
+
+	$ git add kidgloves.rb 
+
+	$ git status -s
+	 M README
+	S  kidgloves.rb
+
+!SLIDE commandline incremental 
+
+	$ export GIT_INDEX_FILE=/tmp/index
+	$ git read-tree HEAD
+	$ git add README 
+
+	$ git status -s
+	S  README
+	 M kidgloves.rb
+
+!SLIDE commandline incremental 
+
+	$ unset GIT_INDEX_FILE
+
+	$ git status -s
+	 M README
+	S  kidgloves.rb
+
+	$ export GIT_INDEX_FILE=/tmp/index
+
+	$ git status -s
+	S  README
+	 M kidgloves.rb
+
+!SLIDE code
+
+# GIT_WORK_TREE #
+
+!SLIDE commandline incremental
+
+	$ git status -s
+	 M README
+	S  kidgloves.rb
+
+	$ export GIT_DIR=$(pwd)/.git
+	$ export GIT_WORK_TREE=$(pwd)
+
+	$ cd /tmp
+	$ git status -s
+	 M README
+	S  kidgloves.rb
+
+!SLIDE
+
+# Overwriting your credentials #
+
+!SLIDE code
+
+# GIT_AUTHOR_NAME #
+# GIT_AUTHOR_EMAIL #
+
+!SLIDE
+
+# Debugging Git #
+
+!SLIDE code
+
+# GIT_MERGE_VERBOSITY #
+
+!SLIDE commandline incremental
+
+	$ git merge 06ca03a
+	Auto-merging kidgloves.rb
+	Merge made by recursive.
+	 kidgloves.rb |    3 +--
+	 1 files changed, 1 insertions(+), 2 deletions(-)
+
+	$ git reset --hard 096880d
+	HEAD is now at 096880d use idiomatic rack :Host and :Port options
+
+	$ GIT_MERGE_VERBOSITY=5 git merge 06ca03a
+	Merging:
+	096880d use idiomatic rack :Host and :Port options
+	virtual 06ca03a
+	found 1 common ancestor(s):
+	66d35ee wasnt setting the header vars properly
+	Auto-merging kidgloves.rb
+	Merge made by recursive.
+	 kidgloves.rb |    3 +--
+	 1 files changed, 1 insertions(+), 2 deletions(-)
+
+!SLIDE code
+
+# GIT_TRACE #
+
+!SLIDE commandline incremental
+
+	$ GIT_TRACE=1 git lol
+	trace: exec: 'git-lol'
+	trace: run_command: 'git-lol'
+	trace: alias expansion: lol => 'log' '--oneline' '--graph' '--decorate'
+	trace: run_command: 'less'
+	trace: exec: 'less'
+	trace: built-in: git 'log' '--oneline' '--graph' '--decorate'
+	*   b896af7 (HEAD, test) Merge commit '06ca03a' into test
+	|\  
+	| * 06ca03a (rtomayko/headernames) no need to delete these header names now
+	| * 8cebd9f CONTENT_TYPE and CONTENT_LENGTH are not prefixed with HTTP_
+	| * 8aff92c request header env keys get HTTP_ prefix
+	* | 096880d (rtomayko/bindopts) use idiomatic rack :Host and :Port options
+	* | 801e40a log to stderr instead of stdout
+	* | 7295993 take listen host/port
+	|/  
+
+
+
+!SLIDE code
+
+# GIT_CURL_VERBOSE #
+
+!SLIDE commandline
+
+	$ GIT_CURL_VERBOSE=1 git clone http://github.com/schacon/showoff.git
+	Cloning into showoff...
+	* Couldn't find host github.com in the .netrc file; using defaults
+	* About to connect() to github.com port 80 (#0)
+	*   Trying 207.97.227.239... * Connected to github.com (207.97.227.239) port 80 (#0)
+	> GET /schacon/showoff.git/info/refs?service=git-upload-pack HTTP/1.1
+	User-Agent: git/1.7.2.1
+	Host: github.com
+	Accept: */*
+	Pragma: no-cache
+
+	< HTTP/1.1 200 OK
+	< Server: nginx/0.7.67
+	< Date: Wed, 11 Aug 2010 20:21:35 GMT
+	< Content-Type: application/x-git-upload-pack-advertisement
+	< Connection: keep-alive
+	< Status: 200 OK
+	< Pragma: no-cache
+	< Content-Length: 1316
+	< Expires: Fri, 01 Jan 1980 00:00:00 GMT
+	< Cache-Control: no-cache, max-age=0, must-revalidate
+	< 
+	* Expire cleared
+	* Connection #0 to host github.com left intact
+	* Couldn't find host github.com in the .netrc file; using defaults
+	* About to connect() to github.com port 80 (#0)
+	*   Trying 207.97.227.239... * connected
+	* Connected to github.com (207.97.227.239) port 80 (#0)
+	> POST /schacon/showoff.git/git-upload-pack HTTP/1.1
+	User-Agent: git/1.7.2.1
+	Host: github.com
+	Accept-Encoding: deflate, gzip
+	Content-Type: application/x-git-upload-pack-request
+	Accept: application/x-git-upload-pack-result
+	Content-Length: 866
+
+	< HTTP/1.1 200 OK
+	< Server: nginx/0.7.67
+	< Date: Wed, 11 Aug 2010 20:21:35 GMT
+	< Content-Type: application/x-git-upload-pack-result
+	< Transfer-Encoding: chunked
+	< Connection: keep-alive
+	< Status: 200 OK
+	< 
+	remote: Counting objects: 1364, done.
+	remote: Compressing objects: 100% (843/843), done.
+	remote: Total 1364 (delta 756), reused 906 (delta 468)
+	* Connection #0 to host github.com left intact
+	Receiving objects: 100% (1364/1364), 342.25 KiB, done.
+	Resolving deltas: 100% (756/756), done.