libpkgconf: dependency: preference uncoloured nodes in event of a dependency collision

feature/tap-sh
William Pitcock 2018-03-18 19:03:18 -05:00
parent 7e9ed6922d
commit 3f753fa3dd
4 changed files with 87 additions and 6 deletions

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@ -88,6 +88,7 @@ EXTRA_DIST = pkg.m4 \
tests/lib1/requires-internal.pc \
tests/lib1/requires-internal-2.pc \
tests/lib1/requires-internal-missing.pc \
tests/lib1/requires-internal-collision.pc \
tests/test_env.sh \
$(test_scripts) \
doc/conf.py \

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@ -52,11 +52,76 @@ dependency_to_str(const pkgconf_dependency_t *dep, char *buf, size_t buflen)
return buf;
}
/* find a colliding dependency that is coloured differently */
static inline pkgconf_dependency_t *
find_colliding_dependency(const pkgconf_dependency_t *dep, const pkgconf_list_t *list)
{
const pkgconf_node_t *n;
PKGCONF_FOREACH_LIST_ENTRY(list->head, n)
{
pkgconf_dependency_t *dep2 = n->data;
if (strcmp(dep->package, dep2->package))
continue;
if (dep->flags != dep2->flags)
return dep2;
}
return NULL;
}
static inline pkgconf_dependency_t *
add_or_replace_dependency_node(const pkgconf_client_t *client, pkgconf_dependency_t *dep, pkgconf_list_t *list)
{
char depbuf[PKGCONF_ITEM_SIZE];
pkgconf_dependency_t *dep2 = find_colliding_dependency(dep, list);
/* there is already a node in the graph which describes this dependency */
if (dep2 != NULL)
{
char depbuf2[PKGCONF_ITEM_SIZE];
PKGCONF_TRACE(client, "dependency collision: [%s/%x] -- [%s/%x]",
dependency_to_str(dep, depbuf, sizeof depbuf), dep->flags,
dependency_to_str(dep2, depbuf2, sizeof depbuf2), dep2->flags);
/* prefer the uncoloured node, either dep or dep2 */
if (dep->flags && dep2->flags == 0)
{
PKGCONF_TRACE(client, "dropping dependency [%s]@%p because of collision", depbuf, dep);
free(dep);
return NULL;
}
else if (dep2->flags && dep->flags == 0)
{
PKGCONF_TRACE(client, "dropping dependency [%s]@%p because of collision", depbuf2, dep2);
pkgconf_node_delete(&dep2->iter, list);
free(dep2);
}
else
/* If both dependencies have equal strength, we keep both, because of situations like:
* Requires: foo > 1, foo < 3
*
* If the situation is that both dependencies are literally equal, it is still harmless because
* fragment deduplication will handle the excessive fragments.
*/
PKGCONF_TRACE(client, "keeping both dependencies (harmless)");
}
PKGCONF_TRACE(client, "added dependency [%s] to list @%p; flags=%x", dependency_to_str(dep, depbuf, sizeof depbuf), list, dep->flags);
pkgconf_node_insert_tail(&dep->iter, dep, list);
return dep;
}
static inline pkgconf_dependency_t *
pkgconf_dependency_addraw(const pkgconf_client_t *client, pkgconf_list_t *list, const char *package, size_t package_sz, const char *version, size_t version_sz, pkgconf_pkg_comparator_t compare, unsigned int flags)
{
pkgconf_dependency_t *dep;
char depbuf[PKGCONF_ITEM_SIZE];
dep = calloc(sizeof(pkgconf_dependency_t), 1);
dep->package = pkgconf_strndup(package, package_sz);
@ -67,10 +132,7 @@ pkgconf_dependency_addraw(const pkgconf_client_t *client, pkgconf_list_t *list,
dep->compare = compare;
dep->flags = flags;
PKGCONF_TRACE(client, "added dependency [%s] to list @%p; flags=%x", dependency_to_str(dep, depbuf, sizeof depbuf), list, dep->flags);
pkgconf_node_insert_tail(&dep->iter, dep, list);
return dep;
return add_or_replace_dependency_node(client, dep, list);
}
/*

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@ -0,0 +1,10 @@
prefix=/test/local
exec_prefix=${prefix}
libdir=${prefix}/lib
includedir=${prefix}/include
Name: requires-internal
Description: A testing pkg-config file
Version: 1.2.3
Requires.internal: cflags-internal
Requires.private: cflags-internal

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@ -13,7 +13,8 @@ tests_init \
libs_static2 \
missing \
requires_internal \
requires_internal_missing
requires_internal_missing \
requires_internal_collision
libs_body()
{
@ -104,3 +105,10 @@ requires_internal_missing_body()
-o ignore \
pkgconf --with-path="${selfdir}/lib1" --static --libs requires-internal-missing
}
requires_internal_collision_body()
{
atf_check \
-o inline:"-I/test/local/include/foo \n" \
pkgconf --with-path="${selfdir}/lib1" --cflags requires-internal-collision
}