mirror of
https://github.com/git/git
synced 2024-08-27 11:39:22 +00:00
![Junio C Hamano](/assets/img/avatar_default.png)
* mm/mkstemps-mode-for-packfiles: Use git_mkstemp_mode instead of plain mkstemp to create object files git_mkstemps_mode: don't set errno to EINVAL on exit. Use git_mkstemp_mode and xmkstemp_mode in odb_mkstemp, not chmod later. git_mkstemp_mode, xmkstemp_mode: variants of gitmkstemps with mode argument. Move gitmkstemps to path.c Add a testcase for ACL with restrictive umask.
731 lines
16 KiB
C
731 lines
16 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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#include "strbuf.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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/* git_mkstemps() - create tmp file with suffix honoring TMPDIR variable. */
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int git_mkstemps(char *path, size_t len, const char *template, int suffix_len)
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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 mkstemps(path, suffix_len);
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}
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/* Adapted from libiberty's mkstemp.c. */
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#undef TMP_MAX
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#define TMP_MAX 16384
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int git_mkstemps_mode(char *pattern, int suffix_len, int mode)
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{
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static const char letters[] =
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"abcdefghijklmnopqrstuvwxyz"
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"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
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"0123456789";
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static const int num_letters = 62;
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uint64_t value;
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struct timeval tv;
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char *template;
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size_t len;
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int fd, count;
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len = strlen(pattern);
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if (len < 6 + suffix_len) {
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errno = EINVAL;
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return -1;
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}
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if (strncmp(&pattern[len - 6 - suffix_len], "XXXXXX", 6)) {
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errno = EINVAL;
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return -1;
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}
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/*
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* Replace pattern's XXXXXX characters with randomness.
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* Try TMP_MAX different filenames.
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*/
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gettimeofday(&tv, NULL);
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value = ((size_t)(tv.tv_usec << 16)) ^ tv.tv_sec ^ getpid();
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template = &pattern[len - 6 - suffix_len];
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for (count = 0; count < TMP_MAX; ++count) {
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uint64_t v = value;
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/* Fill in the random bits. */
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template[0] = letters[v % num_letters]; v /= num_letters;
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template[1] = letters[v % num_letters]; v /= num_letters;
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template[2] = letters[v % num_letters]; v /= num_letters;
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template[3] = letters[v % num_letters]; v /= num_letters;
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template[4] = letters[v % num_letters]; v /= num_letters;
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template[5] = letters[v % num_letters]; v /= num_letters;
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fd = open(pattern, O_CREAT | O_EXCL | O_RDWR, mode);
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if (fd > 0)
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return fd;
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/*
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* Fatal error (EPERM, ENOSPC etc).
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* It doesn't make sense to loop.
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*/
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if (errno != EEXIST)
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break;
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/*
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* This is a random value. It is only necessary that
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* the next TMP_MAX values generated by adding 7777 to
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* VALUE are different with (module 2^32).
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*/
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value += 7777;
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}
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/* We return the null string if we can't find a unique file name. */
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pattern[0] = '\0';
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return -1;
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}
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int git_mkstemp_mode(char *pattern, int mode)
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{
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/* mkstemp is just mkstemps with no suffix */
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return git_mkstemps_mode(pattern, 0, mode);
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}
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int gitmkstemps(char *pattern, int suffix_len)
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{
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return git_mkstemps_mode(pattern, suffix_len, 0600);
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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 >= 5 && !memcmp("refs/", buffer, 5))
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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 >= 5 && !memcmp("refs/", buf, 5))
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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 struct passwd *getpw_str(const char *username, size_t len)
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{
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struct passwd *pw;
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char *username_z = xmalloc(len + 1);
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memcpy(username_z, username, len);
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username_z[len] = '\0';
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pw = getpwnam(username_z);
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free(username_z);
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return pw;
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}
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/*
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* Return a string with ~ and ~user expanded via getpw*. If buf != NULL,
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* then it is a newly allocated string. Returns NULL on getpw failure or
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* if path is NULL.
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*/
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char *expand_user_path(const char *path)
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{
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struct strbuf user_path = STRBUF_INIT;
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const char *first_slash = strchrnul(path, '/');
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const char *to_copy = path;
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if (path == NULL)
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goto return_null;
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if (path[0] == '~') {
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const char *username = path + 1;
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size_t username_len = first_slash - username;
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if (username_len == 0) {
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const char *home = getenv("HOME");
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strbuf_add(&user_path, home, strlen(home));
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} else {
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struct passwd *pw = getpw_str(username, username_len);
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if (!pw)
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goto return_null;
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strbuf_add(&user_path, pw->pw_dir, strlen(pw->pw_dir));
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}
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to_copy = first_slash;
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}
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strbuf_add(&user_path, to_copy, strlen(to_copy));
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return strbuf_detach(&user_path, NULL);
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return_null:
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strbuf_release(&user_path);
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return NULL;
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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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char *newpath = expand_user_path(path);
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if (!newpath || (PATH_MAX - 10 < strlen(newpath))) {
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free(newpath);
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return NULL;
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}
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/*
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* Copy back into the static buffer. A pity
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* since newpath was not bounded, but other
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* branches of the if are limited by PATH_MAX
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* anyway.
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*/
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strcpy(used_path, newpath); free(newpath);
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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;
|
|
|
|
if (access("objects", X_OK) == 0 && access("refs", X_OK) == 0 &&
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validate_headref("HEAD") == 0) {
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set_git_dir(".");
|
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check_repository_format();
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return path;
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|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
int set_shared_perm(const char *path, int mode)
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|
{
|
|
struct stat st;
|
|
int tweak, shared, orig_mode;
|
|
|
|
if (!shared_repository) {
|
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if (mode)
|
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return chmod(path, mode & ~S_IFMT);
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|
return 0;
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|
}
|
|
if (!mode) {
|
|
if (lstat(path, &st) < 0)
|
|
return -1;
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mode = st.st_mode;
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orig_mode = mode;
|
|
} else
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|
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)) {
|
|
/* Copy read bits to execute bits */
|
|
mode |= (shared & 0444) >> 2;
|
|
mode |= FORCE_DIR_SET_GID;
|
|
}
|
|
|
|
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)
|
|
{
|
|
static char buf[PATH_MAX + 1];
|
|
int i = 0, j = 0;
|
|
|
|
if (!base || !base[0])
|
|
return abs;
|
|
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;
|
|
while (is_dir_sep(abs[j]))
|
|
j++;
|
|
if (!abs[j])
|
|
strcpy(buf, ".");
|
|
else
|
|
strcpy(buf, abs + j);
|
|
return buf;
|
|
}
|
|
|
|
/*
|
|
* It is okay if dst == src, but they should not overlap otherwise.
|
|
*
|
|
* 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.
|
|
* 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_path_copy(char *dst, const char *src)
|
|
{
|
|
char *dst0;
|
|
|
|
if (has_dos_drive_prefix(src)) {
|
|
*dst++ = *src++;
|
|
*dst++ = *src++;
|
|
}
|
|
dst0 = dst;
|
|
|
|
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 0;
|
|
}
|
|
|
|
/*
|
|
* path = Canonical absolute path
|
|
* prefix_list = Colon-separated list of absolute paths
|
|
*
|
|
* Determines, for each path in prefix_list, whether the "prefix" really
|
|
* is an ancestor directory of path. Returns the length of the longest
|
|
* ancestor directory, excluding any trailing slashes, or -1 if no prefix
|
|
* is an ancestor. (Note that this means 0 is returned if prefix_list is
|
|
* "/".) "/foo" is not considered an ancestor of "/foobar". Directories
|
|
* are not considered to be their own ancestors. path must be in a
|
|
* canonical form: empty components, or "." or ".." components are not
|
|
* allowed. prefix_list may be null, which is like "".
|
|
*/
|
|
int longest_ancestor_length(const char *path, const char *prefix_list)
|
|
{
|
|
char buf[PATH_MAX+1];
|
|
const char *ceil, *colon;
|
|
int len, max_len = -1;
|
|
|
|
if (prefix_list == NULL || !strcmp(path, "/"))
|
|
return -1;
|
|
|
|
for (colon = ceil = prefix_list; *colon; ceil = colon+1) {
|
|
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);
|
|
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] == '/' &&
|
|
len > max_len) {
|
|
max_len = 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;
|
|
}
|
|
}
|
|
}
|