Add checks to Python scripts for version dependencies.

diff --git a/bisect.c b/bisect.c
index 48acf73391271c1d9061b178a53653357f07f391..bd1b7b5dac81ada592a16630214d1f2cbb655b88 100644 (file)
--- a/bisect.c
+++ b/bisect.c
@@ -833,7 +833,7 @@ static int check_ancestors(const char *prefix)
  */
 static void check_good_are_ancestors_of_bad(const char *prefix, int no_checkout)
 {
-       char *filename = xstrdup(git_path("BISECT_ANCESTORS_OK"));
+       char *filename = git_pathdup("BISECT_ANCESTORS_OK");
        struct stat st;
        int fd;
 
@@ -956,3 +956,41 @@ int bisect_next_all(const char *prefix, int no_checkout)
        return bisect_checkout(bisect_rev_hex, no_checkout);
 }
 
+static inline int log2i(int n)
+{
+       int log2 = 0;
+
+       for (; n > 1; n >>= 1)
+               log2++;
+
+       return log2;
+}
+
+static inline int exp2i(int n)
+{
+       return 1 << n;
+}
+
+/*
+ * Estimate the number of bisect steps left (after the current step)
+ *
+ * For any x between 0 included and 2^n excluded, the probability for
+ * n - 1 steps left looks like:
+ *
+ * P(2^n + x) == (2^n - x) / (2^n + x)
+ *
+ * and P(2^n + x) < 0.5 means 2^n < 3x
+ */
+int estimate_bisect_steps(int all)
+{
+       int n, x, e;
+
+       if (all < 3)
+               return 0;
+
+       n = log2i(all);
+       e = exp2i(n);
+       x = all - e;
+
+       return (e < 3 * x) ? n : n - 1;
+}