/* Re-order a list of target packages with respect to their dependencies.
*
* Example (reverse == 0):
* A depends on C
* B depends on A
* Target order is A,B,C,D
*
* Should be re-ordered to C,A,B,D
*
* packages listed in ignore will not be used to detect indirect dependencies
*
* if reverse is > 0, the dependency order will be reversed.
*
* This function returns the new alpm_list_t* target list.
*
*/
alpm_list_t *_alpm_sortbydeps(alpm_handle_t *handle,
alpm_list_t *targets, alpm_list_t *ignore, int reverse)
{
alpm_list_t *newtargs = NULL;
alpm_list_t *vertices = NULL;
alpm_list_t *vptr;
alpm_graph_t *vertex;
if(targets == NULL) {
return NULL;
}
_alpm_log(handle, ALPM_LOG_DEBUG, "started sorting dependencies\n");
vertices = dep_graph_init(handle, targets, ignore);
vptr = vertices;
vertex = vertices->data;
while(vptr) {
/* mark that we touched the vertex */
vertex->state = -1;
int found = 0;
while(vertex->childptr && !found) {
alpm_graph_t *nextchild = vertex->childptr->data;
vertex->childptr = vertex->childptr->next;
if(nextchild->state == 0) {
found = 1;
nextchild->parent = vertex;
vertex = nextchild;
} else if(nextchild->state == -1) {
/* child is an ancestor of vertex */
alpm_graph_t *transvertex = vertex;
if(!alpm_list_find(targets, nextchild->data, ptr_cmp)) {
/* child is not part of the transaction, not a problem */
continue;
}
/* find the nearest parent that's part of the transaction */
while(transvertex) {
if(alpm_list_find(targets, transvertex->data, ptr_cmp)) {
break;
}
transvertex = transvertex->parent;
}
if(!transvertex || transvertex == nextchild) {
/* no transaction package in our ancestry or the package has
* a circular dependency with itself, not a problem */
} else {
alpm_pkg_t *transpkg = transvertex->data;
alpm_pkg_t *childpkg = nextchild->data;
_alpm_log(handle, ALPM_LOG_WARNING, _("dependency cycle detected:\n"));
if(reverse) {
_alpm_log(handle, ALPM_LOG_WARNING,
_("%s will be removed after its %s dependency\n"),
transpkg->name, childpkg->name);
} else {
_alpm_log(handle, ALPM_LOG_WARNING,
_("%s will be installed before its %s dependency\n"),
transpkg->name, childpkg->name);
}
}
}
}
if(!found) {
if(alpm_list_find(targets, vertex->data, ptr_cmp)) {
newtargs = alpm_list_add(newtargs, vertex->data);
}
/* mark that we've left this vertex */
vertex->state = 1;
vertex = vertex->parent;
if(!vertex) {
/* top level vertex reached, move to the next unprocessed vertex */
for( vptr = vptr->next; vptr; vptr = vptr->next) {
vertex = vptr->data;
if(vertex->state == 0) {
break;
}
}
}
}
}
_alpm_log(handle, ALPM_LOG_DEBUG, "sorting dependencies finished\n");
if(reverse) {
/* reverse the order */
alpm_list_t *tmptargs = alpm_list_reverse(newtargs);
/* free the old one */
alpm_list_free(newtargs);
newtargs = tmptargs;
}
alpm_list_free_inner(vertices, _alpm_graph_free);
alpm_list_free(vertices);
return newtargs;
}
/* Re-order a list of target packages with respect to their dependencies.
*
* Example (reverse == 0):
* A depends on C
* B depends on A
* Target order is A,B,C,D
*
* Should be re-ordered to C,A,B,D
*
* if reverse is > 0, the dependency order will be reversed.
*
* This function returns the new alpm_list_t* target list.
*
*/
alpm_list_t *_alpm_sortbydeps(pmhandle_t *handle,
alpm_list_t *targets, int reverse)
{
alpm_list_t *newtargs = NULL;
alpm_list_t *vertices = NULL;
alpm_list_t *vptr;
pmgraph_t *vertex;
if(targets == NULL) {
return NULL;
}
_alpm_log(handle, PM_LOG_DEBUG, "started sorting dependencies\n");
vertices = dep_graph_init(targets);
vptr = vertices;
vertex = vertices->data;
while(vptr) {
/* mark that we touched the vertex */
vertex->state = -1;
int found = 0;
while(vertex->childptr && !found) {
pmgraph_t *nextchild = vertex->childptr->data;
vertex->childptr = vertex->childptr->next;
if(nextchild->state == 0) {
found = 1;
nextchild->parent = vertex;
vertex = nextchild;
}
else if(nextchild->state == -1) {
pmpkg_t *vertexpkg = vertex->data;
pmpkg_t *childpkg = nextchild->data;
const char *message;
_alpm_log(handle, PM_LOG_WARNING, _("dependency cycle detected:\n"));
if(reverse) {
message =_("%s will be removed after its %s dependency\n");
} else {
message =_("%s will be installed before its %s dependency\n");
}
_alpm_log(handle, PM_LOG_WARNING, message, vertexpkg->name, childpkg->name);
}
}
if(!found) {
newtargs = alpm_list_add(newtargs, vertex->data);
/* mark that we've left this vertex */
vertex->state = 1;
vertex = vertex->parent;
if(!vertex) {
vptr = vptr->next;
while(vptr) {
vertex = vptr->data;
if(vertex->state == 0) break;
vptr = vptr->next;
}
}
}
}
_alpm_log(handle, PM_LOG_DEBUG, "sorting dependencies finished\n");
if(reverse) {
/* reverse the order */
alpm_list_t *tmptargs = alpm_list_reverse(newtargs);
/* free the old one */
alpm_list_free(newtargs);
newtargs = tmptargs;
}
alpm_list_free_inner(vertices, _alpm_graph_free);
alpm_list_free(vertices);
return newtargs;
}