b229d18a80
When we are trying to determine whether a directory contains a git repository, one of the tests we do is to check whether HEAD is either a symlink or a symref into the "refs/" hierarchy, or a detached HEAD. We can tighten this a little more, though: a non-detached HEAD should always point to a branch (since checking out anything else should result in detachment), so it is safe to check for "refs/heads/". Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
460 lines
10 KiB
C
460 lines
10 KiB
C
/*
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* I'm tired of doing "vsnprintf()" etc just to open a
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* file, so here's a "return static buffer with printf"
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* interface for paths.
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*
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* It's obviously not thread-safe. Sue me. But it's quite
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* useful for doing things like
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*
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* f = open(mkpath("%s/%s.git", base, name), O_RDONLY);
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*
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* which is what it's designed for.
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*/
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#include "cache.h"
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static char bad_path[] = "/bad-path/";
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static char *get_pathname(void)
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{
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static char pathname_array[4][PATH_MAX];
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static int index;
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return pathname_array[3 & ++index];
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}
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static char *cleanup_path(char *path)
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{
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/* Clean it up */
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if (!memcmp(path, "./", 2)) {
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path += 2;
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while (*path == '/')
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path++;
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}
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return path;
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}
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char *mksnpath(char *buf, size_t n, const char *fmt, ...)
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{
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va_list args;
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unsigned len;
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va_start(args, fmt);
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len = vsnprintf(buf, n, fmt, args);
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va_end(args);
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if (len >= n) {
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strlcpy(buf, bad_path, n);
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return buf;
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}
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return cleanup_path(buf);
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}
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static char *git_vsnpath(char *buf, size_t n, const char *fmt, va_list args)
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{
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const char *git_dir = get_git_dir();
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size_t len;
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len = strlen(git_dir);
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if (n < len + 1)
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goto bad;
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memcpy(buf, git_dir, len);
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if (len && !is_dir_sep(git_dir[len-1]))
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buf[len++] = '/';
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len += vsnprintf(buf + len, n - len, fmt, args);
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if (len >= n)
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goto bad;
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return cleanup_path(buf);
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bad:
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strlcpy(buf, bad_path, n);
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return buf;
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}
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char *git_snpath(char *buf, size_t n, const char *fmt, ...)
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{
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va_list args;
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va_start(args, fmt);
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(void)git_vsnpath(buf, n, fmt, args);
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va_end(args);
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return buf;
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}
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char *git_pathdup(const char *fmt, ...)
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{
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char path[PATH_MAX];
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va_list args;
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va_start(args, fmt);
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(void)git_vsnpath(path, sizeof(path), fmt, args);
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va_end(args);
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return xstrdup(path);
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}
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char *mkpath(const char *fmt, ...)
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{
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va_list args;
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unsigned len;
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char *pathname = get_pathname();
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va_start(args, fmt);
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len = vsnprintf(pathname, PATH_MAX, fmt, args);
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va_end(args);
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if (len >= PATH_MAX)
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return bad_path;
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return cleanup_path(pathname);
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}
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char *git_path(const char *fmt, ...)
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{
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const char *git_dir = get_git_dir();
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char *pathname = get_pathname();
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va_list args;
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unsigned len;
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len = strlen(git_dir);
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if (len > PATH_MAX-100)
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return bad_path;
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memcpy(pathname, git_dir, len);
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if (len && git_dir[len-1] != '/')
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pathname[len++] = '/';
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va_start(args, fmt);
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len += vsnprintf(pathname + len, PATH_MAX - len, fmt, args);
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va_end(args);
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if (len >= PATH_MAX)
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return bad_path;
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return cleanup_path(pathname);
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}
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/* git_mkstemp() - create tmp file honoring TMPDIR variable */
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int git_mkstemp(char *path, size_t len, const char *template)
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{
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const char *tmp;
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size_t n;
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tmp = getenv("TMPDIR");
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if (!tmp)
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tmp = "/tmp";
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n = snprintf(path, len, "%s/%s", tmp, template);
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if (len <= n) {
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errno = ENAMETOOLONG;
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return -1;
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}
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return mkstemp(path);
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}
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int validate_headref(const char *path)
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{
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struct stat st;
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char *buf, buffer[256];
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unsigned char sha1[20];
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int fd;
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ssize_t len;
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if (lstat(path, &st) < 0)
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return -1;
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/* Make sure it is a "refs/.." symlink */
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if (S_ISLNK(st.st_mode)) {
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len = readlink(path, buffer, sizeof(buffer)-1);
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if (len >= 11 && !memcmp("refs/heads/", buffer, 11))
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return 0;
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return -1;
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}
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/*
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* Anything else, just open it and try to see if it is a symbolic ref.
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*/
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fd = open(path, O_RDONLY);
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if (fd < 0)
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return -1;
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len = read_in_full(fd, buffer, sizeof(buffer)-1);
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close(fd);
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/*
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* Is it a symbolic ref?
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*/
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if (len < 4)
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return -1;
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if (!memcmp("ref:", buffer, 4)) {
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buf = buffer + 4;
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len -= 4;
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while (len && isspace(*buf))
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buf++, len--;
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if (len >= 11 && !memcmp("refs/heads/", buf, 11))
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return 0;
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}
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/*
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* Is this a detached HEAD?
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*/
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if (!get_sha1_hex(buffer, sha1))
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return 0;
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return -1;
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}
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static char *user_path(char *buf, char *path, int sz)
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{
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struct passwd *pw;
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char *slash;
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int len, baselen;
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if (!path || path[0] != '~')
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return NULL;
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path++;
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slash = strchr(path, '/');
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if (path[0] == '/' || !path[0]) {
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pw = getpwuid(getuid());
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}
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else {
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if (slash) {
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*slash = 0;
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pw = getpwnam(path);
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*slash = '/';
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}
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else
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pw = getpwnam(path);
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}
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if (!pw || !pw->pw_dir || sz <= strlen(pw->pw_dir))
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return NULL;
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baselen = strlen(pw->pw_dir);
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memcpy(buf, pw->pw_dir, baselen);
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while ((1 < baselen) && (buf[baselen-1] == '/')) {
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buf[baselen-1] = 0;
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baselen--;
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}
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if (slash && slash[1]) {
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len = strlen(slash);
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if (sz <= baselen + len)
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return NULL;
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memcpy(buf + baselen, slash, len + 1);
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}
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return buf;
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}
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/*
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* First, one directory to try is determined by the following algorithm.
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*
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* (0) If "strict" is given, the path is used as given and no DWIM is
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* done. Otherwise:
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* (1) "~/path" to mean path under the running user's home directory;
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* (2) "~user/path" to mean path under named user's home directory;
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* (3) "relative/path" to mean cwd relative directory; or
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* (4) "/absolute/path" to mean absolute directory.
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*
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* Unless "strict" is given, we try access() for existence of "%s.git/.git",
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* "%s/.git", "%s.git", "%s" in this order. The first one that exists is
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* what we try.
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*
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* Second, we try chdir() to that. Upon failure, we return NULL.
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*
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* Then, we try if the current directory is a valid git repository.
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* Upon failure, we return NULL.
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*
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* If all goes well, we return the directory we used to chdir() (but
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* before ~user is expanded), avoiding getcwd() resolving symbolic
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* links. User relative paths are also returned as they are given,
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* except DWIM suffixing.
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*/
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char *enter_repo(char *path, int strict)
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{
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static char used_path[PATH_MAX];
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static char validated_path[PATH_MAX];
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if (!path)
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return NULL;
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if (!strict) {
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static const char *suffix[] = {
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".git/.git", "/.git", ".git", "", NULL,
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};
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int len = strlen(path);
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int i;
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while ((1 < len) && (path[len-1] == '/')) {
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path[len-1] = 0;
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len--;
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}
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if (PATH_MAX <= len)
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return NULL;
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if (path[0] == '~') {
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if (!user_path(used_path, path, PATH_MAX))
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return NULL;
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strcpy(validated_path, path);
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path = used_path;
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}
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else if (PATH_MAX - 10 < len)
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return NULL;
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else {
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path = strcpy(used_path, path);
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strcpy(validated_path, path);
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}
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len = strlen(path);
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for (i = 0; suffix[i]; i++) {
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strcpy(path + len, suffix[i]);
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if (!access(path, F_OK)) {
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strcat(validated_path, suffix[i]);
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break;
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}
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}
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if (!suffix[i] || chdir(path))
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return NULL;
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path = validated_path;
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}
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else if (chdir(path))
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return NULL;
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if (access("objects", X_OK) == 0 && access("refs", X_OK) == 0 &&
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validate_headref("HEAD") == 0) {
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setenv(GIT_DIR_ENVIRONMENT, ".", 1);
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check_repository_format();
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return path;
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}
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return NULL;
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}
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int adjust_shared_perm(const char *path)
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{
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struct stat st;
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int mode;
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if (!shared_repository)
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return 0;
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if (lstat(path, &st) < 0)
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return -1;
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mode = st.st_mode;
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if (shared_repository) {
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int tweak = shared_repository;
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if (!(mode & S_IWUSR))
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tweak &= ~0222;
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mode |= tweak;
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} else {
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/* Preserve old PERM_UMASK behaviour */
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if (mode & S_IWUSR)
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mode |= S_IWGRP;
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}
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if (S_ISDIR(mode)) {
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mode |= FORCE_DIR_SET_GID;
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/* Copy read bits to execute bits */
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mode |= (shared_repository & 0444) >> 2;
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}
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if ((mode & st.st_mode) != mode && chmod(path, mode) < 0)
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return -2;
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return 0;
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}
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const char *make_relative_path(const char *abs, const char *base)
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{
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static char buf[PATH_MAX + 1];
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int baselen;
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if (!base)
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return abs;
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baselen = strlen(base);
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if (prefixcmp(abs, base))
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return abs;
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if (abs[baselen] == '/')
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baselen++;
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else if (base[baselen - 1] != '/')
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return abs;
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strcpy(buf, abs + baselen);
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return buf;
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}
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/*
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* path = absolute path
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* buf = buffer of at least max(2, strlen(path)+1) bytes
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* It is okay if buf == path, but they should not overlap otherwise.
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*
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* Performs the following normalizations on path, storing the result in buf:
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* - Removes trailing slashes.
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* - Removes empty components.
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* - Removes "." components.
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* - Removes ".." components, and the components the precede them.
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* "" and paths that contain only slashes are normalized to "/".
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* Returns the length of the output.
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*
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* Note that this function is purely textual. It does not follow symlinks,
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* verify the existence of the path, or make any system calls.
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*/
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int normalize_absolute_path(char *buf, const char *path)
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{
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const char *comp_start = path, *comp_end = path;
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char *dst = buf;
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int comp_len;
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assert(buf);
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assert(path);
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while (*comp_start) {
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assert(*comp_start == '/');
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while (*++comp_end && *comp_end != '/')
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; /* nothing */
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comp_len = comp_end - comp_start;
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if (!strncmp("/", comp_start, comp_len) ||
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!strncmp("/.", comp_start, comp_len))
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goto next;
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if (!strncmp("/..", comp_start, comp_len)) {
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while (dst > buf && *--dst != '/')
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; /* nothing */
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goto next;
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}
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memmove(dst, comp_start, comp_len);
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dst += comp_len;
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next:
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comp_start = comp_end;
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}
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if (dst == buf)
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*dst++ = '/';
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*dst = '\0';
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return dst - buf;
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}
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/*
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* path = Canonical absolute path
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* prefix_list = Colon-separated list of absolute paths
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*
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* Determines, for each path in prefix_list, whether the "prefix" really
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* is an ancestor directory of path. Returns the length of the longest
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* ancestor directory, excluding any trailing slashes, or -1 if no prefix
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* is an ancestor. (Note that this means 0 is returned if prefix_list is
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* "/".) "/foo" is not considered an ancestor of "/foobar". Directories
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* are not considered to be their own ancestors. path must be in a
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* canonical form: empty components, or "." or ".." components are not
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* allowed. prefix_list may be null, which is like "".
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*/
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int longest_ancestor_length(const char *path, const char *prefix_list)
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{
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char buf[PATH_MAX+1];
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const char *ceil, *colon;
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int len, max_len = -1;
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if (prefix_list == NULL || !strcmp(path, "/"))
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return -1;
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for (colon = ceil = prefix_list; *colon; ceil = colon+1) {
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for (colon = ceil; *colon && *colon != ':'; colon++);
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len = colon - ceil;
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if (len == 0 || len > PATH_MAX || !is_absolute_path(ceil))
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continue;
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strlcpy(buf, ceil, len+1);
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len = normalize_absolute_path(buf, buf);
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/* Strip "trailing slashes" from "/". */
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if (len == 1)
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len = 0;
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if (!strncmp(path, buf, len) &&
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path[len] == '/' &&
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len > max_len) {
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max_len = len;
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}
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}
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return max_len;
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}
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