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I am writing a pre-commit hook for Git that runs pyflakes and checks for tabs and trailing spaces in the modified files (code on Github). I would like to make it possible to override the hook by asking for user confirmation as follows:
answer = raw_input('Commit anyway? [N/y] ')
if answer.strip()[0].lower() == 'y':
print >> sys.stderr, 'Committing anyway.'
sys.exit(0)
else:
print >> sys.stderr, 'Commit aborted.'
sys.exit(1)
This code produces an error:
Commit anyway? [N/y] Traceback (most recent call last):
File ".git/hooks/pre-commit", line 59, in ?
main()
File ".git/hooks/pre-commit", line 20, in main
answer = raw_input('Commit anyway? [N/y] ')
EOFError: EOF when reading a line
Is it even possible to use raw_input() or a similar function in Git hooks and if yes, what am I doing wrong?
903
Python raw_input function is used to get the values from the user. We call this function to tell the program to stop and wait for the user to input the values. It is a built-in function. The input function is used only in Python 2. x version.
Git hooks are language agnostic. I wrote this small hook as a shell script, but you can use other languages liek Perl, Ruby or Python. Here is an example of a pre-commit hook in written in Python.
The raw_input() function reads a line from input (i.e. the user) and returns a string by stripping a trailing newline. This page shows some common and useful raw_input() examples for new users. Please note that raw_input() was renamed to input() in Python version 3.
Git hooks are scripts that run automatically every time a particular event occurs in a Git repository. They let you customize Git's internal behavior and trigger customizable actions at key points in the development life cycle.
You could use:
sys.stdin = open('/dev/tty')
answer = raw_input('Commit anyway? [N/y] ')
if answer.strip().lower().startswith('y'):
...
git commit calls python .git/hooks/pre-commit:
% ps axu
...
unutbu 21801 0.0 0.1 6348 1520 pts/1 S+ 17:44 0:00 git commit -am line 5a
unutbu 21802 0.1 0.2 5708 2944 pts/1 S+ 17:44 0:00 python .git/hooks/pre-commit
Looking inside /proc/21802/fd (on this linux box) shows the state of the file descriptors for the process with PID 21802 (the pre-commit process):
/proc/21802/fd:
lrwx------ 1 unutbu unutbu 64 2011-09-15 17:45 0 -> /dev/null
lrwx------ 1 unutbu unutbu 64 2011-09-15 17:45 1 -> /dev/pts/1
lrwx------ 1 unutbu unutbu 64 2011-09-15 17:45 2 -> /dev/pts/1
lr-x------ 1 unutbu unutbu 64 2011-09-15 17:45 3 -> /dev/tty
lr-x------ 1 unutbu unutbu 64 2011-09-15 17:45 5 -> /dev/null
Thus, pre-commit was spawned with sys.stdin pointing at /dev/null.
sys.stdin = open('/dev/tty') redirects sys.stdin to an open filehandle from which raw_input can read.
108
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