c1274495ce
Make the oidmap a pointer. That way we eliminate the need for the global boolean variable 'replace_object_prepared' as we can put this information into the pointer being NULL or not. Another advantage of this is that we would more quickly catch code that tries to access replace-map without initializing it. This also allows the '#include "oidmap.h"' introduced in a previous patch to be replaced by the forward declaration of 'struct oidmap;'. Keeping the type opaque discourages circumventing accessor functions; not dragging in other headers avoids some compile time overhead. One disadvantage of this is change is performance as we need to pay the overhead for a malloc. The alternative of moving the global variable into the object store is less modular code. Helped-by: René Scharfe <l.s.r@web.de> Helped-by: Junio C Hamano <gitster@pobox.com> Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
76 lines
2.0 KiB
C
76 lines
2.0 KiB
C
#include "cache.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(const char *refname,
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const struct object_id *oid,
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int flag, void *cb_data)
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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(the_repository->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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static void prepare_replace_object(void)
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{
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if (the_repository->objects->replace_map)
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return;
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the_repository->objects->replace_map =
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xmalloc(sizeof(*the_repository->objects->replace_map));
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oidmap_init(the_repository->objects->replace_map, 0);
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for_each_replace_ref(register_replace_ref, NULL);
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if (!the_repository->objects->replace_map->map.tablesize)
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check_replace_refs = 0;
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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 check_replace_refs.
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*/
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const struct object_id *do_lookup_replace_object(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();
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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(the_repository->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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