问题
I'm trying to use the following post-commit hook to deploy to a particular directory after each successful commit:
#!/bin/sh
export GIT_WORK_TREE=/var/www/example/
export GIT_DIR=/home/mark/test/.git/
git checkout -f
However, after committing I get the following error:
$ git commit -m 'An example commit.'
fatal: Unable to create '/var/www/example/.git/index.lock': No such file or directory
[master 0938e48] An example commit.
... as if the GIT_WORK_TREE setting is being ignored. Why does setting this environment variable appear to be not working? I'm using git version 1.7.4.1.
回答1:
The problem here is that in post-commit hooks (and also
pre-commit, prepare-commit-msg and commit-msgt) the
GIT_INDEX_FILE environment variable is set to .git/index. (This
isn't documented in the githooks
documentation, but I've
posted elsewhere about the settings of environment variables and the
current directory in git
hooks.)
The effect of the GIT_INDEX_FILE environment variable is described
in the ENVIRONMENT VARIABLES section of the git man page as:
GIT_INDEX_FILE
This environment [variable] allows the specification of an alternate index file. If not specified, the default of
$GIT_DIR/indexis used.
... and for some reason, in this situation, GIT_INDEX_FILE is being
used relative to GIT_WORK_TREE.
To make the hook work as you would expect, you just need to unset
GIT_INDEX_FILE, so your hook would look like:
#!/bin/sh
unset GIT_INDEX_FILE
export GIT_WORK_TREE=/var/www/example/
export GIT_DIR=/home/mark/test/.git/
git checkout -f
来源：https://stackoverflow.com/questions/7645480/why-doesnt-setting-git-work-tree-work-in-a-post-commit-hook