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Fix work-tree related breakages 

In set_work_tree(), variable rel needs to be reinitialized to
NULL on every call (it should not be static).

Make sure the incoming dir variable is not too long before
copying to the temporary buffer, and make sure chdir to the
resulting directory succeeds.

This was spotted and fixed by Alex and Johannes in a handful
patch exchanges.  Here is the final version.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
Acked-by: Johannes Schindelin <Johannes.Schindelin@gmx.de>
maint
Junio C Hamano 2007-08-02 15:10:56 -07:00
parent 29093c28a2
commit 6490a3383f
1 changed files with 14 additions and 8 deletions
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22
setup.c
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@ -201,26 +201,32 @@ int is_inside_work_tree(void)
*/
const char *set_work_tree(const char *dir)
{
char dir_buffer[PATH_MAX];
static char buffer[PATH_MAX + 1], *rel = NULL;
int len, postfix_len = strlen(DEFAULT_GIT_DIR_ENVIRONMENT) + 1;
char dir_buffer[PATH_MAX], *rel = NULL;
static char buffer[PATH_MAX + 1];
int len, suffix_len = strlen(DEFAULT_GIT_DIR_ENVIRONMENT) + 1;

/* strip the variable 'dir' of the postfix "/.git" if it has it */
len = strlen(dir);
if (len > postfix_len && !strcmp(dir + len - postfix_len,
"/" DEFAULT_GIT_DIR_ENVIRONMENT)) {
strncpy(dir_buffer, dir, len - postfix_len);
if (len > suffix_len &&
!strcmp(dir + len - suffix_len, "/" DEFAULT_GIT_DIR_ENVIRONMENT)) {
if ((len - suffix_len) >= sizeof(dir_buffer))
die("directory name too long");
memcpy(dir_buffer, dir, len - suffix_len);
dir_buffer[len - suffix_len] = '\0';

/* are we inside the default work tree? */
rel = get_relative_cwd(buffer, sizeof(buffer), dir_buffer);
}

/* if rel is set, the cwd is _not_ the current working tree */
if (rel && *rel) {
if (!is_absolute_path(dir))
set_git_dir(make_absolute_path(dir));
dir = dir_buffer;
chdir(dir);
strcat(rel, "/");
if (chdir(dir))
die("cannot chdir to %s: %s", dir, strerror(errno));
else
strcat(rel, "/");
inside_git_dir = 0;
} else {
rel = NULL;