I have just started with Python and my first assignment is to write a script to determine if a directory where it is ran is a git repository. A co-student suggested this code:
#! /usr/bin/env python
from subprocess import Popen, PIPE, STDOUT
if Popen(("git", "branch"), stderr=STDOUT, stdout=PIPE).returncode != 0:
print("Nope!")
else:
print("Yup!")
It should print an output depending on what the returncode of console command "git branch" is. However, the script did not work in the repository.
In any case, I would be grateful for any piece of advice regarding this.
The assignment also includes:
Many thanks!
Install gitpython
, eg pip install gitpython
.
Then make a function like this:
import git
...
def is_git_repo(path):
try:
_ = git.Repo(path).git_dir
return True
except git.exc.InvalidGitRepositoryError:
return False
Close! Popen is a more complicated object that starts a process but requires other interaction to get information. In your case, you need to call wait() so that the Popen object waits for the program completes to get the return code. You also risk the program hanging if the command returns too much information to fit in the pipe. Try 'call' (it calls wait for you) and send the command output to the bit bucket.
#! /usr/bin/env python
from subprocess import call, STDOUT
import os
if call(["git", "branch"], stderr=STDOUT, stdout=open(os.devnull, 'w')) != 0:
print("Nope!")
else:
print("Yup!")
While tdelaney's answer is correct, I would like to post a function which is more generalised and can be quickly copy-pasted into someone's script:
There are two requirements for the function:
import os
import subprocess
And the function is quite simple:
def is_git_directory(path = '.'):
return subprocess.call(['git', '-C', path, 'status'], stderr=subprocess.STDOUT, stdout = open(os.devnull, 'w')) == 0
只让 python 检查并查看当前运行目录中是否存在名为 .git 的文件夹不是更容易吗?
You could install GitPython and then you can apply this code
import git
def is_git_repo(path):
try:
_ = git.Repo(path).git_dir
return True
except git.exc.InvalidGitRepositoryError:
return False
The folder in question might also be within a git repo. For that reason I like to extract the root folder as well:
def getGitRoot(p):
"""Return None if p is not in a git repo, or the root of the repo if it is"""
if call(["git", "branch"], stderr=STDOUT, stdout=open(os.devnull, 'w'), cwd=p) != 0:
return None
else:
root = check_output(["git", "rev-parse", "--show-toplevel"], cwd=p)
return root
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