f1178380ac
The 'read_replace_objects' constant is initialized by git_default_config (if core.useReplaceRefs is disabled) and within setup_git_env (if GIT_NO_REPLACE_OBJECTS) is set. To ensure that this variable cannot be set accidentally in other places, wrap it in a replace_refs_enabled() method. Since we still assign this global in config.c, we are not able to remove the global scope of this variable and make it a static within replace-object.c. This will happen in a later change which will also prevent the variable from being read before it is initialized. Centralizing read access to the variable is an important first step. Signed-off-by: Derrick Stolee <derrickstolee@github.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
97 lines
2.4 KiB
C
97 lines
2.4 KiB
C
#include "git-compat-util.h"
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#include "gettext.h"
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#include "hex.h"
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#include "oidmap.h"
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#include "object-store.h"
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#include "replace-object.h"
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#include "refs.h"
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#include "repository.h"
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#include "commit.h"
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static int register_replace_ref(struct repository *r,
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const char *refname,
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const struct object_id *oid,
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int flag UNUSED,
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void *cb_data UNUSED)
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{
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/* Get sha1 from refname */
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const char *slash = strrchr(refname, '/');
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const char *hash = slash ? slash + 1 : refname;
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struct replace_object *repl_obj = xmalloc(sizeof(*repl_obj));
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if (get_oid_hex(hash, &repl_obj->original.oid)) {
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free(repl_obj);
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warning(_("bad replace ref name: %s"), refname);
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return 0;
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}
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/* Copy sha1 from the read ref */
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oidcpy(&repl_obj->replacement, oid);
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/* Register new object */
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if (oidmap_put(r->objects->replace_map, repl_obj))
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die(_("duplicate replace ref: %s"), refname);
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return 0;
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}
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void prepare_replace_object(struct repository *r)
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{
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if (r->objects->replace_map_initialized)
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return;
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pthread_mutex_lock(&r->objects->replace_mutex);
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if (r->objects->replace_map_initialized) {
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pthread_mutex_unlock(&r->objects->replace_mutex);
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return;
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}
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r->objects->replace_map =
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xmalloc(sizeof(*r->objects->replace_map));
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oidmap_init(r->objects->replace_map, 0);
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for_each_replace_ref(r, register_replace_ref, NULL);
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r->objects->replace_map_initialized = 1;
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pthread_mutex_unlock(&r->objects->replace_mutex);
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}
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/* We allow "recursive" replacement. Only within reason, though */
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#define MAXREPLACEDEPTH 5
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/*
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* If a replacement for object oid has been set up, return the
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* replacement object's name (replaced recursively, if necessary).
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* The return value is either oid or a pointer to a
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* permanently-allocated value. This function always respects replace
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* references, regardless of the value of read_replace_refs.
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*/
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const struct object_id *do_lookup_replace_object(struct repository *r,
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const struct object_id *oid)
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{
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int depth = MAXREPLACEDEPTH;
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const struct object_id *cur = oid;
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prepare_replace_object(r);
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/* Try to recursively replace the object */
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while (depth-- > 0) {
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struct replace_object *repl_obj =
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oidmap_get(r->objects->replace_map, cur);
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if (!repl_obj)
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return cur;
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cur = &repl_obj->replacement;
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}
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die(_("replace depth too high for object %s"), oid_to_hex(oid));
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}
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void disable_replace_refs(void)
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{
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read_replace_refs = 0;
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}
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int replace_refs_enabled(struct repository *r)
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{
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return read_replace_refs;
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}
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