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-rw-r--r--path.c90
1 files changed, 88 insertions, 2 deletions
diff --git a/path.c b/path.c
index 79aa104712..b4c8d91722 100644
--- a/path.c
+++ b/path.c
@@ -157,6 +157,85 @@ int git_mkstemps(char *path, size_t len, const char *template, int suffix_len)
return mkstemps(path, suffix_len);
}
+/* Adapted from libiberty's mkstemp.c. */
+
+#undef TMP_MAX
+#define TMP_MAX 16384
+
+int git_mkstemps_mode(char *pattern, int suffix_len, int mode)
+{
+ static const char letters[] =
+ "abcdefghijklmnopqrstuvwxyz"
+ "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+ "0123456789";
+ static const int num_letters = 62;
+ uint64_t value;
+ struct timeval tv;
+ char *template;
+ size_t len;
+ int fd, count;
+
+ len = strlen(pattern);
+
+ if (len < 6 + suffix_len) {
+ errno = EINVAL;
+ return -1;
+ }
+
+ if (strncmp(&pattern[len - 6 - suffix_len], "XXXXXX", 6)) {
+ errno = EINVAL;
+ return -1;
+ }
+
+ /*
+ * Replace pattern's XXXXXX characters with randomness.
+ * Try TMP_MAX different filenames.
+ */
+ gettimeofday(&tv, NULL);
+ value = ((size_t)(tv.tv_usec << 16)) ^ tv.tv_sec ^ getpid();
+ template = &pattern[len - 6 - suffix_len];
+ for (count = 0; count < TMP_MAX; ++count) {
+ uint64_t v = value;
+ /* Fill in the random bits. */
+ template[0] = letters[v % num_letters]; v /= num_letters;
+ template[1] = letters[v % num_letters]; v /= num_letters;
+ template[2] = letters[v % num_letters]; v /= num_letters;
+ template[3] = letters[v % num_letters]; v /= num_letters;
+ template[4] = letters[v % num_letters]; v /= num_letters;
+ template[5] = letters[v % num_letters]; v /= num_letters;
+
+ fd = open(pattern, O_CREAT | O_EXCL | O_RDWR, mode);
+ if (fd > 0)
+ return fd;
+ /*
+ * Fatal error (EPERM, ENOSPC etc).
+ * It doesn't make sense to loop.
+ */
+ if (errno != EEXIST)
+ break;
+ /*
+ * This is a random value. It is only necessary that
+ * the next TMP_MAX values generated by adding 7777 to
+ * VALUE are different with (module 2^32).
+ */
+ value += 7777;
+ }
+ /* We return the null string if we can't find a unique file name. */
+ pattern[0] = '\0';
+ return -1;
+}
+
+int git_mkstemp_mode(char *pattern, int mode)
+{
+ /* mkstemp is just mkstemps with no suffix */
+ return git_mkstemps_mode(pattern, 0, mode);
+}
+
+int gitmkstemps(char *pattern, int suffix_len)
+{
+ return git_mkstemps_mode(pattern, suffix_len, 0600);
+}
+
int validate_headref(const char *path)
{
struct stat st;
@@ -336,7 +415,7 @@ char *enter_repo(char *path, int strict)
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;
}
@@ -610,7 +689,7 @@ int daemon_avoid_alias(const char *p)
/*
* 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 canonicalizations.
+ * 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
@@ -649,3 +728,10 @@ int daemon_avoid_alias(const char *p)
}
}
}
+
+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]);
+}