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setup: make sure git dir path is in a permanent buffer

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If setup_git_env() is run before the usual repository discovery
sequence and .git is a file with the text

	gitdir: <path>

(with <path> any string) then the in-core git_dir variable is set to
the result of converting <path> to an absolute path using
make_absolute_path().

Unfortunately make_absolute_path() returns its result in a static
buffer that is overwritten by later calls.  Such a call could cause
later accesses to git_dir (from git_pathdup(), for example) to read
the wrong path, leaving git very confused.

It is not obvious whether any existing code in git will trigger the
problem, but in any case, it is worth a few dozen bytes to copy the
return value from make_absolute_path() for some added peace of mind.

Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jonathan Nieder 2010-10-02 03:36:52 -05:00 committed by Junio C Hamano
parent 7f7868eadc
commit 06f3549d71
1 changed files with 3 additions and 1 deletions
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4
environment.c
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@ -87,8 +87,10 @@ const char * const local_repo_env[LOCAL_REPO_ENV_SIZE + 1] = {
static void setup_git_env(void)
{
git_dir = getenv(GIT_DIR_ENVIRONMENT);
if (!git_dir)
if (!git_dir) {
git_dir = read_gitfile_gently(DEFAULT_GIT_DIR_ENVIRONMENT);
git_dir = git_dir ? xstrdup(git_dir) : NULL;
}
if (!git_dir)
git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
git_object_dir = getenv(DB_ENVIRONMENT);