How to check repository/working tree status from a script

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Hi,

I am kind of new to git, and my thinking is still somewhat
svn-centric. Please keep this in mind just in case that I have
misunderstood some of git's concepts.

I would like to check in a script whether there (a) are uncommitted
changes (as in "working tree differs from local repository") and/or
whether there (b) are unpulled changes in the "remote origin"
repository.

I have to admit that I didn't bother about (b) yet, but for (a) there
seems no possibility other than to parse git status' output since it
seems to always return exit code 1:

$ GIT_PAGER=cat git status; echo $?
# On branch master
nothing to commit (working directory clean)
1
$ touch keks
$ GIT_PAGER=cat git status; echo $?
# On branch master
# Untracked files:
#   (use "git add <file>..." to include in what will be committed)
#
#       bla
nothing added to commit but untracked files present (use "git add" to
track)
1
$

Am I missing something here? Is there documentation about the exit
codes of the different git subcommands or probably a complete solution
for my two endeavours?

Any hints will be appreciated.

Greetings
Marc

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