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index 76e8872622e435b050f77198ef6eef6e6ff6869e..6f3f5d56c0ed76f50d1aa37646d18ae280f1edbb 100644 (file)
--- a/path.c
+++ b/path.c
* which is what it's designed for.
*/
#include "cache.h"
+#include "strbuf.h"
static char bad_path[] = "/bad-path/";
return path;
}
+char *mksnpath(char *buf, size_t n, const char *fmt, ...)
+{
+ va_list args;
+ unsigned len;
+
+ va_start(args, fmt);
+ len = vsnprintf(buf, n, fmt, args);
+ va_end(args);
+ if (len >= n) {
+ strlcpy(buf, bad_path, n);
+ return buf;
+ }
+ return cleanup_path(buf);
+}
+
+static char *git_vsnpath(char *buf, size_t n, const char *fmt, va_list args)
+{
+ const char *git_dir = get_git_dir();
+ size_t len;
+
+ len = strlen(git_dir);
+ if (n < len + 1)
+ goto bad;
+ memcpy(buf, git_dir, len);
+ if (len && !is_dir_sep(git_dir[len-1]))
+ buf[len++] = '/';
+ len += vsnprintf(buf + len, n - len, fmt, args);
+ if (len >= n)
+ goto bad;
+ return cleanup_path(buf);
+bad:
+ strlcpy(buf, bad_path, n);
+ return buf;
+}
+
+char *git_snpath(char *buf, size_t n, const char *fmt, ...)
+{
+ va_list args;
+ va_start(args, fmt);
+ (void)git_vsnpath(buf, n, fmt, args);
+ va_end(args);
+ return buf;
+}
+
+char *git_pathdup(const char *fmt, ...)
+{
+ char path[PATH_MAX];
+ va_list args;
+ va_start(args, fmt);
+ (void)git_vsnpath(path, sizeof(path), fmt, args);
+ va_end(args);
+ return xstrdup(path);
+}
+
char *mkpath(const char *fmt, ...)
{
va_list args;
return cleanup_path(pathname);
}
-
-/* git_mkstemp() - create tmp file honoring TMPDIR variable */
-int git_mkstemp(char *path, size_t len, const char *template)
+char *git_path_submodule(const char *path, const char *fmt, ...)
{
- const char *tmp;
- size_t n;
-
- tmp = getenv("TMPDIR");
- if (!tmp)
- tmp = "/tmp";
- n = snprintf(path, len, "%s/%s", tmp, template);
- if (len <= n) {
- errno = ENAMETOOLONG;
- return -1;
+ char *pathname = get_pathname();
+ struct strbuf buf = STRBUF_INIT;
+ const char *git_dir;
+ va_list args;
+ unsigned len;
+
+ len = strlen(path);
+ if (len > PATH_MAX-100)
+ return bad_path;
+
+ strbuf_addstr(&buf, path);
+ if (len && path[len-1] != '/')
+ strbuf_addch(&buf, '/');
+ strbuf_addstr(&buf, ".git");
+
+ git_dir = read_gitfile(buf.buf);
+ if (git_dir) {
+ strbuf_reset(&buf);
+ strbuf_addstr(&buf, git_dir);
}
- return mkstemp(path);
-}
+ strbuf_addch(&buf, '/');
+
+ if (buf.len >= PATH_MAX)
+ return bad_path;
+ memcpy(pathname, buf.buf, buf.len + 1);
+ strbuf_release(&buf);
+ len = strlen(pathname);
+
+ va_start(args, fmt);
+ len += vsnprintf(pathname + len, PATH_MAX - len, fmt, args);
+ va_end(args);
+ if (len >= PATH_MAX)
+ return bad_path;
+ return cleanup_path(pathname);
+}
int validate_headref(const char *path)
{
return -1;
}
-static char *user_path(char *buf, char *path, int sz)
+static struct passwd *getpw_str(const char *username, size_t len)
{
struct passwd *pw;
- char *slash;
- int len, baselen;
+ char *username_z = xmalloc(len + 1);
+ memcpy(username_z, username, len);
+ username_z[len] = '\0';
+ pw = getpwnam(username_z);
+ free(username_z);
+ return pw;
+}
- if (!path || path[0] != '~')
- return NULL;
- path++;
- slash = strchr(path, '/');
- if (path[0] == '/' || !path[0]) {
- pw = getpwuid(getuid());
- }
- else {
- if (slash) {
- *slash = 0;
- pw = getpwnam(path);
- *slash = '/';
+/*
+ * Return a string with ~ and ~user expanded via getpw*. If buf != NULL,
+ * then it is a newly allocated string. Returns NULL on getpw failure or
+ * if path is NULL.
+ */
+char *expand_user_path(const char *path)
+{
+ struct strbuf user_path = STRBUF_INIT;
+ const char *first_slash = strchrnul(path, '/');
+ const char *to_copy = path;
+
+ if (path == NULL)
+ goto return_null;
+ if (path[0] == '~') {
+ const char *username = path + 1;
+ size_t username_len = first_slash - username;
+ if (username_len == 0) {
+ const char *home = getenv("HOME");
+ if (!home)
+ goto return_null;
+ strbuf_add(&user_path, home, strlen(home));
+ } else {
+ struct passwd *pw = getpw_str(username, username_len);
+ if (!pw)
+ goto return_null;
+ strbuf_add(&user_path, pw->pw_dir, strlen(pw->pw_dir));
}
- else
- pw = getpwnam(path);
- }
- if (!pw || !pw->pw_dir || sz <= strlen(pw->pw_dir))
- return NULL;
- baselen = strlen(pw->pw_dir);
- memcpy(buf, pw->pw_dir, baselen);
- while ((1 < baselen) && (buf[baselen-1] == '/')) {
- buf[baselen-1] = 0;
- baselen--;
- }
- if (slash && slash[1]) {
- len = strlen(slash);
- if (sz <= baselen + len)
- return NULL;
- memcpy(buf + baselen, slash, len + 1);
+ to_copy = first_slash;
}
- return buf;
+ strbuf_add(&user_path, to_copy, strlen(to_copy));
+ return strbuf_detach(&user_path, NULL);
+return_null:
+ strbuf_release(&user_path);
+ return NULL;
}
/*
if (PATH_MAX <= len)
return NULL;
if (path[0] == '~') {
- if (!user_path(used_path, path, PATH_MAX))
+ char *newpath = expand_user_path(path);
+ if (!newpath || (PATH_MAX - 10 < strlen(newpath))) {
+ free(newpath);
return NULL;
+ }
+ /*
+ * Copy back into the static buffer. A pity
+ * since newpath was not bounded, but other
+ * branches of the if are limited by PATH_MAX
+ * anyway.
+ */
+ strcpy(used_path, newpath); free(newpath);
strcpy(validated_path, path);
path = used_path;
}
if (access("objects", X_OK) == 0 && access("refs", X_OK) == 0 &&
validate_headref("HEAD") == 0) {
- setenv(GIT_DIR_ENVIRONMENT, ".", 1);
+ set_git_dir(".");
check_repository_format();
return path;
}
return NULL;
}
-int adjust_shared_perm(const char *path)
+int set_shared_perm(const char *path, int mode)
{
struct stat st;
- int mode;
+ int tweak, shared, orig_mode;
- if (!shared_repository)
+ if (!shared_repository) {
+ if (mode)
+ return chmod(path, mode & ~S_IFMT);
return 0;
- if (lstat(path, &st) < 0)
- return -1;
- mode = st.st_mode;
-
- if (shared_repository) {
- int tweak = shared_repository;
- if (!(mode & S_IWUSR))
- tweak &= ~0222;
- mode |= tweak;
- } else {
- /* Preserve old PERM_UMASK behaviour */
- if (mode & S_IWUSR)
- mode |= S_IWGRP;
}
+ if (!mode) {
+ if (lstat(path, &st) < 0)
+ return -1;
+ mode = st.st_mode;
+ orig_mode = mode;
+ } else
+ orig_mode = 0;
+ if (shared_repository < 0)
+ shared = -shared_repository;
+ else
+ shared = shared_repository;
+ tweak = shared;
+
+ if (!(mode & S_IWUSR))
+ tweak &= ~0222;
+ if (mode & S_IXUSR)
+ /* Copy read bits to execute bits */
+ tweak |= (tweak & 0444) >> 2;
+ if (shared_repository < 0)
+ mode = (mode & ~0777) | tweak;
+ else
+ mode |= tweak;
if (S_ISDIR(mode)) {
- mode |= FORCE_DIR_SET_GID;
-
/* Copy read bits to execute bits */
- mode |= (shared_repository & 0444) >> 2;
+ mode |= (shared & 0444) >> 2;
+ mode |= FORCE_DIR_SET_GID;
}
- if ((mode & st.st_mode) != mode && chmod(path, mode) < 0)
+ if (((shared_repository < 0
+ ? (orig_mode & (FORCE_DIR_SET_GID | 0777))
+ : (orig_mode & mode)) != mode) &&
+ chmod(path, (mode & ~S_IFMT)) < 0)
return -2;
return 0;
}
-const char *make_relative_path(const char *abs, const char *base)
+const char *relative_path(const char *abs, const char *base)
{
static char buf[PATH_MAX + 1];
- int baselen;
- if (!base)
- return abs;
- baselen = strlen(base);
- if (prefixcmp(abs, base))
+ int i = 0, j = 0;
+
+ if (!base || !base[0])
return abs;
- if (abs[baselen] == '/')
- baselen++;
- else if (base[baselen - 1] != '/')
+ while (base[i]) {
+ if (is_dir_sep(base[i])) {
+ if (!is_dir_sep(abs[j]))
+ return abs;
+ while (is_dir_sep(base[i]))
+ i++;
+ while (is_dir_sep(abs[j]))
+ j++;
+ continue;
+ } else if (abs[j] != base[i]) {
+ return abs;
+ }
+ i++;
+ j++;
+ }
+ if (
+ /* "/foo" is a prefix of "/foo" */
+ abs[j] &&
+ /* "/foo" is not a prefix of "/foobar" */
+ !is_dir_sep(base[i-1]) && !is_dir_sep(abs[j])
+ )
return abs;
- strcpy(buf, abs + baselen);
+ while (is_dir_sep(abs[j]))
+ j++;
+ if (!abs[j])
+ strcpy(buf, ".");
+ else
+ strcpy(buf, abs + j);
return buf;
}
/*
- * path = absolute path
- * buf = buffer of at least max(2, strlen(path)+1) bytes
- * It is okay if buf == path, but they should not overlap otherwise.
+ * It is okay if dst == src, but they should not overlap otherwise.
*
- * Performs the following normalizations on path, storing the result in buf:
- * - Removes trailing slashes.
- * - Removes empty components.
+ * Performs the following normalizations on src, storing the result in dst:
+ * - Ensures that components are separated by '/' (Windows only)
+ * - Squashes sequences of '/'.
* - Removes "." components.
* - Removes ".." components, and the components the precede them.
- * "" and paths that contain only slashes are normalized to "/".
- * Returns the length of the output.
+ * Returns failure (non-zero) if a ".." component appears as first path
+ * component anytime during the normalization. Otherwise, returns success (0).
*
* Note that this function is purely textual. It does not follow symlinks,
* verify the existence of the path, or make any system calls.
*/
-int normalize_absolute_path(char *buf, const char *path)
+int normalize_path_copy(char *dst, const char *src)
{
- const char *comp_start = path, *comp_end = path;
- char *dst = buf;
- int comp_len;
- assert(buf);
- assert(path);
-
- while (*comp_start) {
- assert(*comp_start == '/');
- while (*++comp_end && *comp_end != '/')
- ; /* nothing */
- comp_len = comp_end - comp_start;
-
- if (!strncmp("/", comp_start, comp_len) ||
- !strncmp("/.", comp_start, comp_len))
- goto next;
-
- if (!strncmp("/..", comp_start, comp_len)) {
- while (dst > buf && *--dst != '/')
- ; /* nothing */
- goto next;
- }
+ char *dst0;
- memcpy(dst, comp_start, comp_len);
- dst += comp_len;
- next:
- comp_start = comp_end;
+ if (has_dos_drive_prefix(src)) {
+ *dst++ = *src++;
+ *dst++ = *src++;
}
+ dst0 = dst;
- if (dst == buf)
+ if (is_dir_sep(*src)) {
*dst++ = '/';
+ while (is_dir_sep(*src))
+ src++;
+ }
+
+ for (;;) {
+ char c = *src;
+
+ /*
+ * A path component that begins with . could be
+ * special:
+ * (1) "." and ends -- ignore and terminate.
+ * (2) "./" -- ignore them, eat slash and continue.
+ * (3) ".." and ends -- strip one and terminate.
+ * (4) "../" -- strip one, eat slash and continue.
+ */
+ if (c == '.') {
+ if (!src[1]) {
+ /* (1) */
+ src++;
+ } else if (is_dir_sep(src[1])) {
+ /* (2) */
+ src += 2;
+ while (is_dir_sep(*src))
+ src++;
+ continue;
+ } else if (src[1] == '.') {
+ if (!src[2]) {
+ /* (3) */
+ src += 2;
+ goto up_one;
+ } else if (is_dir_sep(src[2])) {
+ /* (4) */
+ src += 3;
+ while (is_dir_sep(*src))
+ src++;
+ goto up_one;
+ }
+ }
+ }
+ /* copy up to the next '/', and eat all '/' */
+ while ((c = *src++) != '\0' && !is_dir_sep(c))
+ *dst++ = c;
+ if (is_dir_sep(c)) {
+ *dst++ = '/';
+ while (is_dir_sep(c))
+ c = *src++;
+ src--;
+ } else if (!c)
+ break;
+ continue;
+
+ up_one:
+ /*
+ * dst0..dst is prefix portion, and dst[-1] is '/';
+ * go up one level.
+ */
+ dst--; /* go to trailing '/' */
+ if (dst <= dst0)
+ return -1;
+ /* Windows: dst[-1] cannot be backslash anymore */
+ while (dst0 < dst && dst[-1] != '/')
+ dst--;
+ }
*dst = '\0';
- return dst - buf;
+ return 0;
}
/*
return -1;
for (colon = ceil = prefix_list; *colon; ceil = colon+1) {
- for (colon = ceil; *colon && *colon != ':'; colon++);
+ for (colon = ceil; *colon && *colon != PATH_SEP; colon++);
len = colon - ceil;
if (len == 0 || len > PATH_MAX || !is_absolute_path(ceil))
continue;
strlcpy(buf, ceil, len+1);
- len = normalize_absolute_path(buf, buf);
- /* Strip "trailing slashes" from "/". */
- if (len == 1)
- len = 0;
+ if (normalize_path_copy(buf, buf) < 0)
+ continue;
+ len = strlen(buf);
+ if (len > 0 && buf[len-1] == '/')
+ buf[--len] = '\0';
if (!strncmp(path, buf, len) &&
path[len] == '/' &&
return max_len;
}
+
+/* strip arbitrary amount of directory separators at end of path */
+static inline int chomp_trailing_dir_sep(const char *path, int len)
+{
+ while (len && is_dir_sep(path[len - 1]))
+ len--;
+ return len;
+}
+
+/*
+ * If path ends with suffix (complete path components), returns the
+ * part before suffix (sans trailing directory separators).
+ * Otherwise returns NULL.
+ */
+char *strip_path_suffix(const char *path, const char *suffix)
+{
+ int path_len = strlen(path), suffix_len = strlen(suffix);
+
+ while (suffix_len) {
+ if (!path_len)
+ return NULL;
+
+ if (is_dir_sep(path[path_len - 1])) {
+ if (!is_dir_sep(suffix[suffix_len - 1]))
+ return NULL;
+ path_len = chomp_trailing_dir_sep(path, path_len);
+ suffix_len = chomp_trailing_dir_sep(suffix, suffix_len);
+ }
+ else if (path[--path_len] != suffix[--suffix_len])
+ return NULL;
+ }
+
+ if (path_len && !is_dir_sep(path[path_len - 1]))
+ return NULL;
+ return xstrndup(path, chomp_trailing_dir_sep(path, path_len));
+}
+
+int daemon_avoid_alias(const char *p)
+{
+ int sl, ndot;
+
+ /*
+ * This resurrects the belts and suspenders paranoia check by HPA
+ * done in <435560F7.4080006@zytor.com> thread, now enter_repo()
+ * does not do getcwd() based path canonicalization.
+ *
+ * sl becomes true immediately after seeing '/' and continues to
+ * be true as long as dots continue after that without intervening
+ * non-dot character.
+ */
+ if (!p || (*p != '/' && *p != '~'))
+ return -1;
+ sl = 1; ndot = 0;
+ p++;
+
+ while (1) {
+ char ch = *p++;
+ if (sl) {
+ if (ch == '.')
+ ndot++;
+ else if (ch == '/') {
+ if (ndot < 3)
+ /* reject //, /./ and /../ */
+ return -1;
+ ndot = 0;
+ }
+ else if (ch == 0) {
+ if (0 < ndot && ndot < 3)
+ /* reject /.$ and /..$ */
+ return -1;
+ return 0;
+ }
+ else
+ sl = ndot = 0;
+ }
+ else if (ch == 0)
+ return 0;
+ else if (ch == '/') {
+ sl = 1;
+ ndot = 0;
+ }
+ }
+}
+
+int offset_1st_component(const char *path)
+{
+ if (has_dos_drive_prefix(path))
+ return 2 + is_dir_sep(path[2]);
+ return is_dir_sep(path[0]);
+}