solver, db: implement repository pinning

Improves /etc/apk/repositories format so you can say:
http://nl.alpinelinux.org/alpine/v2.3/main
@edge http://nl.alpinelinux.org/alpine/edge/main
@testing http://nl.alpinelinux.org/alpine/edge/testing

After which you can pin dependencies to these tags using:
 apk add stableapp newapp@edge bleedingapp@testing

Apk will now by default only use the untagged repositories,
but adding a tag to specific dependency:
 1. will prefer that tag for the name
 2. allowing pulling in dependencies from that tag (though,
    it prefers untagged packages to satisfy deps if possible)

fixes #575

1 files changed, 5 insertions, 3 deletions

diff --git a/src/apk_package.h b/src/apk_package.h
index c68fef7..a241a67 100644
--- a/src/apk_package.h
+++ b/src/apk_package.h
@@ -59,6 +59,7 @@ struct apk_sign_ctx {
 struct apk_dependency {
 	struct apk_name *name;
 	apk_blob_t *version;
+	unsigned short repository_tag;
 	unsigned optional : 1;
 	unsigned result_mask : 3;
 };
@@ -120,12 +121,13 @@ void apk_dep_from_pkg(struct apk_dependency *dep, struct apk_database *db,
 		      struct apk_package *pkg);
 int apk_dep_is_satisfied(struct apk_dependency *dep, struct apk_package *pkg);
 
-void apk_blob_push_dep(apk_blob_t *to, struct apk_dependency *dep);
-void apk_blob_push_deps(apk_blob_t *to, struct apk_dependency_array *deps);
+void apk_blob_push_dep(apk_blob_t *to, struct apk_database *, struct apk_dependency *dep);
+void apk_blob_push_deps(apk_blob_t *to, struct apk_database *, struct apk_dependency_array *deps);
 void apk_blob_pull_dep(apk_blob_t *from, struct apk_database *, struct apk_dependency *);
 void apk_blob_pull_deps(apk_blob_t *from, struct apk_database *, struct apk_dependency_array **);
 
-int apk_deps_write(struct apk_dependency_array *deps, struct apk_ostream *os);
+int apk_deps_write(struct apk_database *db, struct apk_dependency_array *deps,
+		   struct apk_ostream *os);
 
 int apk_deps_add(struct apk_dependency_array **depends,
 		 struct apk_dependency *dep);