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authorJeff King <peff@peff.net>2015-10-05 03:46:04 (GMT)
committerJunio C Hamano <gitster@pobox.com>2015-10-05 18:07:04 (GMT)
commit9c28390bda4bb86f48a3145417c1cb1892782c47 (patch)
tree61720ec3de74f3a84a8885f5585e91948b4d68cd /builtin/init-db.c
parentfdf729661a777d8bd598f40055d92b2df5601332 (diff)
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init: use strbufs to store paths
The init code predates strbufs, and uses PATH_MAX-sized buffers along with many manual checks on intermediate sizes (some of which make magic assumptions, such as that init will not create a path inside .git longer than 50 characters). We can simplify this greatly by using strbufs, which drops some hard-to-verify strcpy calls in favor of git_path_buf. While we're in the area, let's also convert existing calls to git_path to the safer git_path_buf (our existing calls were passed to pretty tame functions, and so were not a problem, but it's easy to be consistent and safe here). Note that we had an explicit test that "git init" rejects long template directories. This comes from 32d1776 (init: Do not segfault on big GIT_TEMPLATE_DIR environment variable, 2009-04-18). We can drop the test_must_fail here, as we now accept this and need only confirm that we don't segfault, which was the original point of the test. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 'builtin/init-db.c')
-rw-r--r--builtin/init-db.c172
1 files changed, 74 insertions, 98 deletions
diff --git a/builtin/init-db.c b/builtin/init-db.c
index 89addda..f59f407 100644
--- a/builtin/init-db.c
+++ b/builtin/init-db.c
@@ -36,10 +36,11 @@ static void safe_create_dir(const char *dir, int share)
die(_("Could not make %s writable by group"), dir);
}
-static void copy_templates_1(char *path, int baselen,
- char *template, int template_baselen,
+static void copy_templates_1(struct strbuf *path, struct strbuf *template,
DIR *dir)
{
+ size_t path_baselen = path->len;
+ size_t template_baselen = template->len;
struct dirent *de;
/* Note: if ".git/hooks" file exists in the repository being
@@ -49,77 +50,64 @@ static void copy_templates_1(char *path, int baselen,
* with the way the namespace under .git/ is organized, should
* be really carefully chosen.
*/
- safe_create_dir(path, 1);
+ safe_create_dir(path->buf, 1);
while ((de = readdir(dir)) != NULL) {
struct stat st_git, st_template;
- int namelen;
int exists = 0;
+ strbuf_setlen(path, path_baselen);
+ strbuf_setlen(template, template_baselen);
+
if (de->d_name[0] == '.')
continue;
- namelen = strlen(de->d_name);
- if ((PATH_MAX <= baselen + namelen) ||
- (PATH_MAX <= template_baselen + namelen))
- die(_("insanely long template name %s"), de->d_name);
- memcpy(path + baselen, de->d_name, namelen+1);
- memcpy(template + template_baselen, de->d_name, namelen+1);
- if (lstat(path, &st_git)) {
+ strbuf_addstr(path, de->d_name);
+ strbuf_addstr(template, de->d_name);
+ if (lstat(path->buf, &st_git)) {
if (errno != ENOENT)
- die_errno(_("cannot stat '%s'"), path);
+ die_errno(_("cannot stat '%s'"), path->buf);
}
else
exists = 1;
- if (lstat(template, &st_template))
- die_errno(_("cannot stat template '%s'"), template);
+ if (lstat(template->buf, &st_template))
+ die_errno(_("cannot stat template '%s'"), template->buf);
if (S_ISDIR(st_template.st_mode)) {
- DIR *subdir = opendir(template);
- int baselen_sub = baselen + namelen;
- int template_baselen_sub = template_baselen + namelen;
+ DIR *subdir = opendir(template->buf);
if (!subdir)
- die_errno(_("cannot opendir '%s'"), template);
- path[baselen_sub++] =
- template[template_baselen_sub++] = '/';
- path[baselen_sub] =
- template[template_baselen_sub] = 0;
- copy_templates_1(path, baselen_sub,
- template, template_baselen_sub,
- subdir);
+ die_errno(_("cannot opendir '%s'"), template->buf);
+ strbuf_addch(path, '/');
+ strbuf_addch(template, '/');
+ copy_templates_1(path, template, subdir);
closedir(subdir);
}
else if (exists)
continue;
else if (S_ISLNK(st_template.st_mode)) {
- char lnk[256];
- int len;
- len = readlink(template, lnk, sizeof(lnk));
- if (len < 0)
- die_errno(_("cannot readlink '%s'"), template);
- if (sizeof(lnk) <= len)
- die(_("insanely long symlink %s"), template);
- lnk[len] = 0;
- if (symlink(lnk, path))
- die_errno(_("cannot symlink '%s' '%s'"), lnk, path);
+ struct strbuf lnk = STRBUF_INIT;
+ if (strbuf_readlink(&lnk, template->buf, 0) < 0)
+ die_errno(_("cannot readlink '%s'"), template->buf);
+ if (symlink(lnk.buf, path->buf))
+ die_errno(_("cannot symlink '%s' '%s'"),
+ lnk.buf, path->buf);
+ strbuf_release(&lnk);
}
else if (S_ISREG(st_template.st_mode)) {
- if (copy_file(path, template, st_template.st_mode))
- die_errno(_("cannot copy '%s' to '%s'"), template,
- path);
+ if (copy_file(path->buf, template->buf, st_template.st_mode))
+ die_errno(_("cannot copy '%s' to '%s'"),
+ template->buf, path->buf);
}
else
- error(_("ignoring template %s"), template);
+ error(_("ignoring template %s"), template->buf);
}
}
static void copy_templates(const char *template_dir)
{
- char path[PATH_MAX];
- char template_path[PATH_MAX];
- int template_len;
+ struct strbuf path = STRBUF_INIT;
+ struct strbuf template_path = STRBUF_INIT;
+ size_t template_len;
DIR *dir;
- const char *git_dir = get_git_dir();
- int len = strlen(git_dir);
char *to_free = NULL;
if (!template_dir)
@@ -132,26 +120,23 @@ static void copy_templates(const char *template_dir)
free(to_free);
return;
}
- template_len = strlen(template_dir);
- if (PATH_MAX <= (template_len+strlen("/config")))
- die(_("insanely long template path %s"), template_dir);
- strcpy(template_path, template_dir);
- if (template_path[template_len-1] != '/') {
- template_path[template_len++] = '/';
- template_path[template_len] = 0;
- }
- dir = opendir(template_path);
+
+ strbuf_addstr(&template_path, template_dir);
+ strbuf_complete(&template_path, '/');
+ template_len = template_path.len;
+
+ dir = opendir(template_path.buf);
if (!dir) {
warning(_("templates not found %s"), template_dir);
goto free_return;
}
/* Make sure that template is from the correct vintage */
- strcpy(template_path + template_len, "config");
+ strbuf_addstr(&template_path, "config");
repository_format_version = 0;
git_config_from_file(check_repository_format_version,
- template_path, NULL);
- template_path[template_len] = 0;
+ template_path.buf, NULL);
+ strbuf_setlen(&template_path, template_len);
if (repository_format_version &&
repository_format_version != GIT_REPO_VERSION) {
@@ -162,17 +147,15 @@ static void copy_templates(const char *template_dir)
goto close_free_return;
}
- memcpy(path, git_dir, len);
- if (len && path[len - 1] != '/')
- path[len++] = '/';
- path[len] = 0;
- copy_templates_1(path, len,
- template_path, template_len,
- dir);
+ strbuf_addstr(&path, get_git_dir());
+ strbuf_complete(&path, '/');
+ copy_templates_1(&path, &template_path, dir);
close_free_return:
closedir(dir);
free_return:
free(to_free);
+ strbuf_release(&path);
+ strbuf_release(&template_path);
}
static int git_init_db_config(const char *k, const char *v, void *cb)
@@ -199,28 +182,20 @@ static int needs_work_tree_config(const char *git_dir, const char *work_tree)
static int create_default_files(const char *template_path)
{
- const char *git_dir = get_git_dir();
- unsigned len = strlen(git_dir);
- static char path[PATH_MAX];
struct stat st1;
+ struct strbuf buf = STRBUF_INIT;
+ char *path;
char repo_version_string[10];
char junk[2];
int reinit;
int filemode;
- if (len > sizeof(path)-50)
- die(_("insane git directory %s"), git_dir);
- memcpy(path, git_dir, len);
-
- if (len && path[len-1] != '/')
- path[len++] = '/';
-
/*
* Create .git/refs/{heads,tags}
*/
- safe_create_dir(git_path("refs"), 1);
- safe_create_dir(git_path("refs/heads"), 1);
- safe_create_dir(git_path("refs/tags"), 1);
+ safe_create_dir(git_path_buf(&buf, "refs"), 1);
+ safe_create_dir(git_path_buf(&buf, "refs/heads"), 1);
+ safe_create_dir(git_path_buf(&buf, "refs/tags"), 1);
/* Just look for `init.templatedir` */
git_config(git_init_db_config, NULL);
@@ -244,16 +219,16 @@ static int create_default_files(const char *template_path)
*/
if (shared_repository) {
adjust_shared_perm(get_git_dir());
- adjust_shared_perm(git_path("refs"));
- adjust_shared_perm(git_path("refs/heads"));
- adjust_shared_perm(git_path("refs/tags"));
+ adjust_shared_perm(git_path_buf(&buf, "refs"));
+ adjust_shared_perm(git_path_buf(&buf, "refs/heads"));
+ adjust_shared_perm(git_path_buf(&buf, "refs/tags"));
}
/*
* Create the default symlink from ".git/HEAD" to the "master"
* branch, if it does not exist yet.
*/
- strcpy(path + len, "HEAD");
+ path = git_path_buf(&buf, "HEAD");
reinit = (!access(path, R_OK)
|| readlink(path, junk, sizeof(junk)-1) != -1);
if (!reinit) {
@@ -266,10 +241,8 @@ static int create_default_files(const char *template_path)
"%d", GIT_REPO_VERSION);
git_config_set("core.repositoryformatversion", repo_version_string);
- path[len] = 0;
- strcpy(path + len, "config");
-
/* Check filemode trustability */
+ path = git_path_buf(&buf, "config");
filemode = TEST_FILEMODE;
if (TEST_FILEMODE && !lstat(path, &st1)) {
struct stat st2;
@@ -290,14 +263,13 @@ static int create_default_files(const char *template_path)
/* allow template config file to override the default */
if (log_all_ref_updates == -1)
git_config_set("core.logallrefupdates", "true");
- if (needs_work_tree_config(git_dir, work_tree))
+ if (needs_work_tree_config(get_git_dir(), work_tree))
git_config_set("core.worktree", work_tree);
}
if (!reinit) {
/* Check if symlink is supported in the work tree */
- path[len] = 0;
- strcpy(path + len, "tXXXXXX");
+ path = git_path_buf(&buf, "tXXXXXX");
if (!close(xmkstemp(path)) &&
!unlink(path) &&
!symlink("testing", path) &&
@@ -308,31 +280,35 @@ static int create_default_files(const char *template_path)
git_config_set("core.symlinks", "false");
/* Check if the filesystem is case-insensitive */
- path[len] = 0;
- strcpy(path + len, "CoNfIg");
+ path = git_path_buf(&buf, "CoNfIg");
if (!access(path, F_OK))
git_config_set("core.ignorecase", "true");
probe_utf8_pathname_composition();
}
+ strbuf_release(&buf);
return reinit;
}
static void create_object_directory(void)
{
- const char *object_directory = get_object_directory();
- int len = strlen(object_directory);
- char *path = xmalloc(len + 40);
+ struct strbuf path = STRBUF_INIT;
+ size_t baselen;
+
+ strbuf_addstr(&path, get_object_directory());
+ baselen = path.len;
+
+ safe_create_dir(path.buf, 1);
- memcpy(path, object_directory, len);
+ strbuf_setlen(&path, baselen);
+ strbuf_addstr(&path, "/pack");
+ safe_create_dir(path.buf, 1);
- safe_create_dir(object_directory, 1);
- strcpy(path+len, "/pack");
- safe_create_dir(path, 1);
- strcpy(path+len, "/info");
- safe_create_dir(path, 1);
+ strbuf_setlen(&path, baselen);
+ strbuf_addstr(&path, "/info");
+ safe_create_dir(path.buf, 1);
- free(path);
+ strbuf_release(&path);
}
int set_git_dir_init(const char *git_dir, const char *real_git_dir,