The superficial aspect of this change is that git-daemon now allows paths
that start with a "~". Previously, if git-daemon was run with
"--base-path=/srv/git", it was impossible to get it to serve
"/srv/git/~foo/bar.git". An odd edge-case that was broken.
But from a source-code standpoint, the change is in path.c:enter_repo(). I
have adjusted it to take separate "strict_prefix" and "strict_suffix"
arguments, rather than a single "strict" argument.
I also make it clearer what the purpose of each path buffer is for, by
renaming them to chdir_path and ret_path; chdir_path is the path that we
pass to chdir(); return_path is the path we return to the user. Using this
nomenclature, we can more easily explain the behavior of the function.
There are 3 DWIM measures that enter_repo() provides: tilde expansion,
suffix guessing, and gitfile expansion; it also trims trailing slashes.
Here is how they are applied to each path:
+------------------------------+----------------+----------------+
| Before this commit | chdir_path | ret_path |
+------------------------------+----------------+----------------+
| trim trailing slashes | !strict | !strict |
| tilde expansion | !strict | false |
| suffix guessing | !strict | !strict |
| gitfile expansion (< 2.6.3) | !strict | false |
| gitfile expansion (>= 2.6.3) | true | strict |
+------------------------------+----------------+----------------+
| With this commit | chdir_path | ret_path |
+------------------------------+----------------+----------------+
| trim trailing slashes | true | true |
| tilde expansion | !strict_prefix | false |
| suffix guessing | !strict_suffix | !strict_suffix |
| gitfile expansion | true | false |
+------------------------------+----------------+----------------+
The separation of "strict" into "strict_prefix" and "strict_suffix" is
necessary for git-daemon because it has separate --strict-paths (affects
prefix and suffix) and --user-path (just prefix) flags that can be toggled
separately.
In the other programs where enter_repo() is called, I continued the
existing behavior of tying the prefix and suffix strictness together
together; though I am not entirely sure that they should all be enabling
tilde expansion. But for now, their behavior hasn't changed.
Signed-off-by: Luke Shumaker <[email protected]>
---
builtin/receive-pack.c | 2 +-
builtin/upload-archive.c | 2 +-
cache.h | 2 +-
daemon.c | 42 +++++++--------
http-backend.c | 2 +-
path.c | 135 +++++++++++++++++++++++++----------------------
upload-pack.c | 2 +-
7 files changed, 96 insertions(+), 91 deletions(-)
diff --git a/builtin/receive-pack.c b/builtin/receive-pack.c
index 011db00..f430e96 100644
--- a/builtin/receive-pack.c
+++ b/builtin/receive-pack.c
@@ -1860,7 +1860,7 @@ int cmd_receive_pack(int argc, const char **argv, const
char *prefix)
setup_path();
- if (!enter_repo(service_dir, 0))
+ if (!enter_repo(service_dir, 0, 0))
die("'%s' does not appear to be a git repository", service_dir);
git_config(receive_pack_config, NULL);
diff --git a/builtin/upload-archive.c b/builtin/upload-archive.c
index 2caedf1..00d4ced 100644
--- a/builtin/upload-archive.c
+++ b/builtin/upload-archive.c
@@ -25,7 +25,7 @@ int cmd_upload_archive_writer(int argc, const char **argv,
const char *prefix)
if (argc != 2)
usage(upload_archive_usage);
- if (!enter_repo(argv[1], 0))
+ if (!enter_repo(argv[1], 0, 0))
die("'%s' does not appear to be a git repository", argv[1]);
/* put received options in sent_argv[] */
diff --git a/cache.h b/cache.h
index 4cba08e..6380be0 100644
--- a/cache.h
+++ b/cache.h
@@ -1024,7 +1024,7 @@ enum scld_error
safe_create_leading_directories_const(const char *path);
int mkdir_in_gitdir(const char *path);
extern char *expand_user_path(const char *path);
-const char *enter_repo(const char *path, int strict);
+const char *enter_repo(const char *path, int strict_prefix, int strict_suffix);
static inline int is_absolute_path(const char *path)
{
return is_dir_sep(path[0]) || has_dos_drive_prefix(path);
diff --git a/daemon.c b/daemon.c
index 425aad0..118d337 100644
--- a/daemon.c
+++ b/daemon.c
@@ -170,27 +170,23 @@ static const char *path_ok(const char *directory, struct
hostinfo *hi)
return NULL;
}
- if (*dir == '~') {
- if (!user_path) {
- logerror("'%s': User-path not allowed", dir);
- return NULL;
- }
- if (*user_path) {
- /* Got either "~alice" or "~alice/foo";
- * rewrite them to "~alice/%s" or
- * "~alice/%s/foo".
- */
- int namlen, restlen = strlen(dir);
- const char *slash = strchr(dir, '/');
- if (!slash)
- slash = dir + restlen;
- namlen = slash - dir;
- restlen -= namlen;
- loginfo("userpath <%s>, request <%s>, namlen %d,
restlen %d, slash <%s>", user_path, dir, namlen, restlen, slash);
- snprintf(rpath, PATH_MAX, "%.*s/%s%.*s",
- namlen, dir, user_path, restlen, slash);
- dir = rpath;
- }
+ if (*dir == '~' && *user_path && user_path[0] != '\0') {
+ /* Got either "~alice" or "~alice/foo";
+ * rewrite them:
+ *
+ * ~alice -> ~alice/user_dir
+ * ~alice/foo -> ~alice/user_dir/foo
+ */
+ int namlen, restlen = strlen(dir);
+ const char *slash = strchr(dir, '/');
+ if (!slash)
+ slash = dir + restlen;
+ namlen = slash - dir;
+ restlen -= namlen;
+ loginfo("userpath <%s>, request <%s>, namlen %d, restlen %d,
slash <%s>", user_path, dir, namlen, restlen, slash);
+ snprintf(rpath, PATH_MAX, "%.*s/%s%.*s",
+ namlen, dir, user_path, restlen, slash);
+ dir = rpath;
}
else if (interpolated_path && hi->saw_extended_args) {
struct strbuf expanded_path = STRBUF_INIT;
@@ -223,14 +219,14 @@ static const char *path_ok(const char *directory, struct
hostinfo *hi)
dir = rpath;
}
- path = enter_repo(dir, strict_paths);
+ path = enter_repo(dir, strict_paths || !user_path, strict_paths);
if (!path && base_path && base_path_relaxed) {
/*
* if we fail and base_path_relaxed is enabled, try without
* prefixing the base path
*/
dir = directory;
- path = enter_repo(dir, strict_paths);
+ path = enter_repo(dir, strict_paths || !user_path,
strict_paths);
}
if (!path) {
diff --git a/http-backend.c b/http-backend.c
index adc8c8c..d71ed81 100644
--- a/http-backend.c
+++ b/http-backend.c
@@ -697,7 +697,7 @@ int cmd_main(int argc, const char **argv)
not_found(&hdr, "Request not supported: '%s'", dir);
setup_path();
- if (!enter_repo(dir, 0))
+ if (!enter_repo(dir, 0, 0))
not_found(&hdr, "Not a git repository: '%s'", dir);
if (!getenv("GIT_HTTP_EXPORT_ALL") &&
access("git-daemon-export-ok", F_OK) )
diff --git a/path.c b/path.c
index fe3c4d9..636349e 100644
--- a/path.c
+++ b/path.c
@@ -646,96 +646,105 @@ char *expand_user_path(const char *path)
}
/*
- * First, one directory to try is determined by the following algorithm.
+ * chdir() to, and set_git_dir() to the directory found with "path", using the
+ * following algorithm.
*
- * (0) If "strict" is given, the path is used as given and no DWIM is
- * done. Otherwise:
- * (1) "~/path" to mean path under the running user's home directory;
- * (2) "~user/path" to mean path under named user's home directory;
- * (3) "relative/path" to mean cwd relative directory; or
- * (4) "/absolute/path" to mean absolute directory.
+ * (0) "relative/path" to mean cwd relative directory; or
+ * (1) "/absolute/path" to mean absolute directory.
+ * (2) trim trailing slashes
*
- * Unless "strict" is given, we check "%s/.git", "%s", "%s.git/.git", "%s.git"
- * in this order. We select the first one that is a valid git repository, and
- * chdir() to it. If none match, or we fail to chdir, we return NULL.
+ * Unless "strict_prefix" is given:
+ * (3) "~/path" to mean path under the running user's home directory;
+ * (4) "~user/path" to mean path under named user's home directory;
*
- * If all goes well, we return the directory we used to chdir() (but
- * before ~user is expanded), avoiding getcwd() resolving symbolic
- * links. User relative paths are also returned as they are given,
- * except DWIM suffixing.
+ * Unless "strict_suffix" is given:
+ * (5) check "%s/.git", "%s", "%s.git/.git", "%s.git" in this order. We select
+ * the first one that is a valid git repository, and chdir() to it. If none
+ * match, we return NULL.
+ *
+ * And then, unconditionally:
+ * (6) If the result is a .git file (instead of a directory) that points to a
+ * directory elsewhere, follow it.
+ *
+ * If all goes well, we return the input path with suffix alteration (steps 2,
+ * 5, 6) applied, but without prefix alteration (user paths) applied. The
+ * returned value is a pointer to a static buffer.
*/
-const char *enter_repo(const char *path, int strict)
+const char *enter_repo(const char *path, int strict_prefix, int strict_suffix)
{
- static struct strbuf validated_path = STRBUF_INIT;
- static struct strbuf used_path = STRBUF_INIT;
+ /* chdir_path is the path we chdir() to */
+ static struct strbuf chdir_path = STRBUF_INIT;
+ /* ret_path is the path we return */
+ static struct strbuf ret_path = STRBUF_INIT;
+
+ int len;
+ const char *gitfile;
if (!path)
return NULL;
- if (!strict) {
+ len = strlen(path);
+
+ /* strip trailing slashes */
+ while ((1 < len) && (path[len-1] == '/'))
+ len--;
+
+ /*
+ * We can handle arbitrary-sized buffers, but this remains as a
+ * sanity check on untrusted input.
+ */
+ if (PATH_MAX <= len)
+ return NULL;
+
+ strbuf_reset(&chdir_path);
+ strbuf_add(&chdir_path, path, len);
+ strbuf_reset(&ret_path);
+ strbuf_add(&ret_path, path, len);
+
+ if (!strict_prefix && chdir_path.buf[0] == '~') {
+ /* operate only on chdir_path */
+ char *newpath = expand_user_path(chdir_path.buf);
+ if (!newpath)
+ return NULL;
+ strbuf_attach(&chdir_path, newpath, strlen(newpath),
+ strlen(newpath));
+ }
+
+ if (!strict_suffix) {
+ /* operate on both chdir_path and ret_path */
static const char *suffix[] = {
"/.git", "", ".git/.git", ".git", NULL,
};
- const char *gitfile;
- int len = strlen(path);
int i;
- while ((1 < len) && (path[len-1] == '/'))
- len--;
-
- /*
- * We can handle arbitrary-sized buffers, but this remains as a
- * sanity check on untrusted input.
- */
- if (PATH_MAX <= len)
- return NULL;
-
- strbuf_reset(&used_path);
- strbuf_reset(&validated_path);
- strbuf_add(&used_path, path, len);
- strbuf_add(&validated_path, path, len);
-
- if (used_path.buf[0] == '~') {
- char *newpath = expand_user_path(used_path.buf);
- if (!newpath)
- return NULL;
- strbuf_attach(&used_path, newpath, strlen(newpath),
- strlen(newpath));
- }
for (i = 0; suffix[i]; i++) {
struct stat st;
- size_t baselen = used_path.len;
- strbuf_addstr(&used_path, suffix[i]);
- if (!stat(used_path.buf, &st) &&
+ size_t baselen = chdir_path.len;
+ strbuf_addstr(&chdir_path, suffix[i]);
+ if (!stat(chdir_path.buf, &st) &&
(S_ISREG(st.st_mode) ||
- (S_ISDIR(st.st_mode) &&
is_git_directory(used_path.buf)))) {
- strbuf_addstr(&validated_path, suffix[i]);
+ (S_ISDIR(st.st_mode) &&
is_git_directory(chdir_path.buf)))) {
+ strbuf_addstr(&ret_path, suffix[i]);
break;
}
- strbuf_setlen(&used_path, baselen);
+ strbuf_setlen(&chdir_path, baselen);
}
if (!suffix[i])
return NULL;
- gitfile = read_gitfile(used_path.buf);
- if (gitfile) {
- strbuf_reset(&used_path);
- strbuf_addstr(&used_path, gitfile);
- }
- if (chdir(used_path.buf))
- return NULL;
- path = validated_path.buf;
}
- else {
- const char *gitfile = read_gitfile(path);
- if (gitfile)
- path = gitfile;
- if (chdir(path))
- return NULL;
+
+ gitfile = read_gitfile(chdir_path.buf);
+ if (gitfile) {
+ /* operate only on chdir_path */
+ strbuf_reset(&chdir_path);
+ strbuf_addstr(&chdir_path, gitfile);
}
+ if (chdir(chdir_path.buf))
+ return NULL;
if (is_git_directory(".")) {
set_git_dir(".");
check_repository_format();
- return path;
+ return ret_path.buf;
}
return NULL;
diff --git a/upload-pack.c b/upload-pack.c
index ca7f941..c73b776 100644
--- a/upload-pack.c
+++ b/upload-pack.c
@@ -859,7 +859,7 @@ int cmd_main(int argc, const char **argv)
dir = argv[0];
- if (!enter_repo(dir, strict))
+ if (!enter_repo(dir, strict, strict))
die("'%s' does not appear to be a git repository", dir);
git_config(upload_pack_config, NULL);
--
2.10.0
