split-index: add tests to demonstrate the racy split index problem

[thirdparty/git.git] / attr.c

diff --git a/attr.c b/attr.c
index 067fb9e0c08cefa2ba1a9b1d3444938c9bab6e3d..98e4953f6e87f5f5ff777ee57cedf705086e109e 100644 (file)
--- a/attr.c
+++ b/attr.c
@@ -708,10 +708,8 @@ static struct attr_stack *read_attr_from_array(const char **list)
  * another thread could potentially be calling into the attribute system.
  */
 static enum git_attr_direction direction;
-static struct index_state *use_index;
 
-void git_attr_set_direction(enum git_attr_direction new_direction,
-                           struct index_state *istate)
+void git_attr_set_direction(enum git_attr_direction new_direction)
 {
        if (is_bare_repository() && new_direction != GIT_ATTR_INDEX)
                BUG("non-INDEX attr direction in a bare repo");
@@ -720,7 +718,6 @@ void git_attr_set_direction(enum git_attr_direction new_direction,
                drop_all_attr_stacks();
 
        direction = new_direction;
-       use_index = istate;
 }
 
 static struct attr_stack *read_attr_from_file(const char *path, int macro_ok)
@@ -743,13 +740,18 @@ static struct attr_stack *read_attr_from_file(const char *path, int macro_ok)
        return res;
 }
 
-static struct attr_stack *read_attr_from_index(const char *path, int macro_ok)
+static struct attr_stack *read_attr_from_index(const struct index_state *istate,
+                                              const char *path,
+                                              int macro_ok)
 {
        struct attr_stack *res;
        char *buf, *sp;
        int lineno = 0;
 
-       buf = read_blob_data_from_index(use_index ? use_index : &the_index, path, NULL);
+       if (!istate)
+               return NULL;
+
+       buf = read_blob_data_from_index(istate, path, NULL);
        if (!buf)
                return NULL;
 
@@ -768,15 +770,16 @@ static struct attr_stack *read_attr_from_index(const char *path, int macro_ok)
        return res;
 }
 
-static struct attr_stack *read_attr(const char *path, int macro_ok)
+static struct attr_stack *read_attr(const struct index_state *istate,
+                                   const char *path, int macro_ok)
 {
        struct attr_stack *res = NULL;
 
        if (direction == GIT_ATTR_INDEX) {
-               res = read_attr_from_index(path, macro_ok);
+               res = read_attr_from_index(istate, path, macro_ok);
        } else if (!is_bare_repository()) {
                if (direction == GIT_ATTR_CHECKOUT) {
-                       res = read_attr_from_index(path, macro_ok);
+                       res = read_attr_from_index(istate, path, macro_ok);
                        if (!res)
                                res = read_attr_from_file(path, macro_ok);
                } else if (direction == GIT_ATTR_CHECKIN) {
@@ -788,7 +791,7 @@ static struct attr_stack *read_attr(const char *path, int macro_ok)
                                 * We allow operation in a sparsely checked out
                                 * work tree, so read from it.
                                 */
-                               res = read_attr_from_index(path, macro_ok);
+                               res = read_attr_from_index(istate, path, macro_ok);
                }
        }
 
@@ -859,7 +862,8 @@ static void push_stack(struct attr_stack **attr_stack_p,
        }
 }
 
-static void bootstrap_attr_stack(struct attr_stack **stack)
+static void bootstrap_attr_stack(const struct index_state *istate,
+                                struct attr_stack **stack)
 {
        struct attr_stack *e;
 
@@ -883,7 +887,7 @@ static void bootstrap_attr_stack(struct attr_stack **stack)
        }
 
        /* root directory */
-       e = read_attr(GITATTRIBUTES_FILE, 1);
+       e = read_attr(istate, GITATTRIBUTES_FILE, 1);
        push_stack(stack, e, xstrdup(""), 0);
 
        /* info frame */
@@ -896,7 +900,8 @@ static void bootstrap_attr_stack(struct attr_stack **stack)
        push_stack(stack, e, NULL, 0);
 }
 
-static void prepare_attr_stack(const char *path, int dirlen,
+static void prepare_attr_stack(const struct index_state *istate,
+                              const char *path, int dirlen,
                               struct attr_stack **stack)
 {
        struct attr_stack *info;
@@ -917,7 +922,7 @@ static void prepare_attr_stack(const char *path, int dirlen,
         * .gitattributes in deeper directories to shallower ones,
         * and finally use the built-in set as the default.
         */
-       bootstrap_attr_stack(stack);
+       bootstrap_attr_stack(istate, stack);
 
        /*
         * Pop the "info" one that is always at the top of the stack.
@@ -973,7 +978,7 @@ static void prepare_attr_stack(const char *path, int dirlen,
                strbuf_add(&pathbuf, path + pathbuf.len, (len - pathbuf.len));
                strbuf_addf(&pathbuf, "/%s", GITATTRIBUTES_FILE);
 
-               next = read_attr(pathbuf.buf, 0);
+               next = read_attr(istate, pathbuf.buf, 0);
 
                /* reset the pathbuf to not include "/.gitattributes" */
                strbuf_setlen(&pathbuf, len);
@@ -1095,7 +1100,9 @@ static void determine_macros(struct all_attrs_item *all_attrs,
  * If check->check_nr is non-zero, only attributes in check[] are collected.
  * Otherwise all attributes are collected.
  */
-static void collect_some_attrs(const char *path, struct attr_check *check)
+static void collect_some_attrs(const struct index_state *istate,
+                              const char *path,
+                              struct attr_check *check)
 {
        int i, pathlen, rem, dirlen;
        const char *cp, *last_slash = NULL;
@@ -1114,7 +1121,7 @@ static void collect_some_attrs(const char *path, struct attr_check *check)
                dirlen = 0;
        }
 
-       prepare_attr_stack(path, dirlen, &check->stack);
+       prepare_attr_stack(istate, path, dirlen, &check->stack);
        all_attrs_init(&g_attr_hashmap, check);
        determine_macros(check->all_attrs, check->stack);
 
@@ -1136,11 +1143,13 @@ static void collect_some_attrs(const char *path, struct attr_check *check)
        fill(path, pathlen, basename_offset, check->stack, check->all_attrs, rem);
 }
 
-int git_check_attr(const char *path, struct attr_check *check)
+int git_check_attr(const struct index_state *istate,
+                  const char *path,
+                  struct attr_check *check)
 {
        int i;
 
-       collect_some_attrs(path, check);
+       collect_some_attrs(istate, path, check);
 
        for (i = 0; i < check->nr; i++) {
                size_t n = check->items[i].attr->attr_nr;
@@ -1153,12 +1162,13 @@ int git_check_attr(const char *path, struct attr_check *check)
        return 0;
 }
 
-void git_all_attrs(const char *path, struct attr_check *check)
+void git_all_attrs(const struct index_state *istate,
+                  const char *path, struct attr_check *check)
 {
        int i;
 
        attr_check_reset(check);
-       collect_some_attrs(path, check);
+       collect_some_attrs(istate, path, check);
 
        for (i = 0; i < check->all_attrs_nr; i++) {
                const char *name = check->all_attrs[i].attr->name;