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-rw-r--r--notes-cache.c93
1 files changed, 93 insertions, 0 deletions
diff --git a/notes-cache.c b/notes-cache.c
new file mode 100644
index 0000000000..4c8984ede1
--- /dev/null
+++ b/notes-cache.c
@@ -0,0 +1,93 @@
+#include "cache.h"
+#include "notes-cache.h"
+#include "commit.h"
+#include "refs.h"
+
+static int notes_cache_match_validity(const char *ref, const char *validity)
+{
+ unsigned char sha1[20];
+ struct commit *commit;
+ struct pretty_print_context pretty_ctx;
+ struct strbuf msg = STRBUF_INIT;
+ int ret;
+
+ if (read_ref(ref, sha1) < 0)
+ return 0;
+
+ commit = lookup_commit_reference_gently(sha1, 1);
+ if (!commit)
+ return 0;
+
+ memset(&pretty_ctx, 0, sizeof(pretty_ctx));
+ format_commit_message(commit, "%s", &msg, &pretty_ctx);
+ strbuf_trim(&msg);
+
+ ret = !strcmp(msg.buf, validity);
+ strbuf_release(&msg);
+
+ return ret;
+}
+
+void notes_cache_init(struct notes_cache *c, const char *name,
+ const char *validity)
+{
+ struct strbuf ref = STRBUF_INIT;
+ int flags = 0;
+
+ memset(c, 0, sizeof(*c));
+ c->validity = xstrdup(validity);
+
+ strbuf_addf(&ref, "refs/notes/%s", name);
+ if (!notes_cache_match_validity(ref.buf, validity))
+ flags = NOTES_INIT_EMPTY;
+ init_notes(&c->tree, ref.buf, combine_notes_overwrite, flags);
+ strbuf_release(&ref);
+}
+
+int notes_cache_write(struct notes_cache *c)
+{
+ unsigned char tree_sha1[20];
+ unsigned char commit_sha1[20];
+
+ if (!c || !c->tree.initialized || !c->tree.ref || !*c->tree.ref)
+ return -1;
+ if (!c->tree.dirty)
+ return 0;
+
+ if (write_notes_tree(&c->tree, tree_sha1))
+ return -1;
+ if (commit_tree(c->validity, tree_sha1, NULL, commit_sha1, NULL) < 0)
+ return -1;
+ if (update_ref("update notes cache", c->tree.ref, commit_sha1, NULL,
+ 0, QUIET_ON_ERR) < 0)
+ return -1;
+
+ return 0;
+}
+
+char *notes_cache_get(struct notes_cache *c, unsigned char key_sha1[20],
+ size_t *outsize)
+{
+ const unsigned char *value_sha1;
+ enum object_type type;
+ char *value;
+ unsigned long size;
+
+ value_sha1 = get_note(&c->tree, key_sha1);
+ if (!value_sha1)
+ return NULL;
+ value = read_sha1_file(value_sha1, &type, &size);
+
+ *outsize = size;
+ return value;
+}
+
+int notes_cache_put(struct notes_cache *c, unsigned char key_sha1[20],
+ const char *data, size_t size)
+{
+ unsigned char value_sha1[20];
+
+ if (write_sha1_file(data, size, "blob", value_sha1) < 0)
+ return -1;
+ return add_note(&c->tree, key_sha1, value_sha1, NULL);
+}