/** Find a package satisfying a specified dependency.
* The dependency can include versions with depmod operators.
* @param pkgs an alpm_list_t* of alpm_pkg_t where the satisfier will be searched
* @param depstring package or provision name, versioned or not
* @return a alpm_pkg_t* satisfying depstring
*/
alpm_pkg_t SYMEXPORT *alpm_find_satisfier(alpm_list_t *pkgs, const char *depstring)
{
alpm_depend_t *dep = _alpm_splitdep(depstring);
if(!dep) {
return NULL;
}
alpm_pkg_t *pkg = find_dep_satisfier(pkgs, dep);
_alpm_dep_free(dep);
return pkg;
}
/** Checks dependencies and returns missing ones in a list.
* Dependencies can include versions with depmod operators.
* @param handle the context handle
* @param pkglist the list of local packages
* @param remove an alpm_list_t* of packages to be removed
* @param upgrade an alpm_list_t* of packages to be upgraded (remove-then-upgrade)
* @param reversedeps handles the backward dependencies
* @return an alpm_list_t* of alpm_depmissing_t pointers.
*/
alpm_list_t SYMEXPORT *alpm_checkdeps(alpm_handle_t *handle,
alpm_list_t *pkglist, alpm_list_t *rem, alpm_list_t *upgrade,
int reversedeps)
{
alpm_list_t *i, *j;
alpm_list_t *dblist = NULL, *modified = NULL;
alpm_list_t *baddeps = NULL;
int nodepversion;
CHECK_HANDLE(handle, return NULL);
for(i = pkglist; i; i = i->next) {
alpm_pkg_t *pkg = i->data;
if(alpm_pkg_find(rem, pkg->name) || alpm_pkg_find(upgrade, pkg->name)) {
modified = alpm_list_add(modified, pkg);
} else {
dblist = alpm_list_add(dblist, pkg);
}
}
nodepversion = no_dep_version(handle);
/* look for unsatisfied dependencies of the upgrade list */
for(i = upgrade; i; i = i->next) {
alpm_pkg_t *tp = i->data;
_alpm_log(handle, ALPM_LOG_DEBUG, "checkdeps: package %s-%s\n",
tp->name, tp->version);
for(j = alpm_pkg_get_depends(tp); j; j = j->next) {
alpm_depend_t *depend = j->data;
depend = filtered_depend(depend, nodepversion);
/* 1. we check the upgrade list */
/* 2. we check database for untouched satisfying packages */
if(!find_dep_satisfier(upgrade, depend) &&
!find_dep_satisfier(dblist, depend)) {
/* Unsatisfied dependency in the upgrade list */
alpm_depmissing_t *miss;
char *missdepstring = alpm_dep_compute_string(depend);
_alpm_log(handle, ALPM_LOG_DEBUG, "checkdeps: missing dependency '%s' for package '%s'\n",
missdepstring, tp->name);
free(missdepstring);
miss = depmiss_new(tp->name, depend, NULL);
baddeps = alpm_list_add(baddeps, miss);
}
release_filtered_depend(depend, nodepversion);
}
}
if(reversedeps) {
/* reversedeps handles the backwards dependencies, ie,
* the packages listed in the requiredby field. */
for(i = dblist; i; i = i->next) {
alpm_pkg_t *lp = i->data;
for(j = alpm_pkg_get_depends(lp); j; j = j->next) {
alpm_depend_t *depend = j->data;
depend = filtered_depend(depend, nodepversion);
alpm_pkg_t *causingpkg = find_dep_satisfier(modified, depend);
/* we won't break this depend, if it is already broken, we ignore it */
/* 1. check upgrade list for satisfiers */
/* 2. check dblist for satisfiers */
if(causingpkg &&
!find_dep_satisfier(upgrade, depend) &&
!find_dep_satisfier(dblist, depend)) {
alpm_depmissing_t *miss;
char *missdepstring = alpm_dep_compute_string(depend);
_alpm_log(handle, ALPM_LOG_DEBUG, "checkdeps: transaction would break '%s' dependency of '%s'\n",
missdepstring, lp->name);
free(missdepstring);
miss = depmiss_new(lp->name, depend, causingpkg->name);
baddeps = alpm_list_add(baddeps, miss);
}
release_filtered_depend(depend, nodepversion);
}
}
}
alpm_list_free(modified);
alpm_list_free(dblist);
return baddeps;
}
/**
* Computes resolvable dependencies for a given package and adds that package
* and those resolvable dependencies to a list.
*
* @param handle the context handle
* @param localpkgs is the list of local packages
* @param pkg is the package to resolve
* @param packages is a pointer to a list of packages which will be
* searched first for any dependency packages needed to complete the
* resolve, and to which will be added any [pkg] and all of its
* dependencies not already on the list
* @param remove is the set of packages which will be removed in this
* transaction
* @param data returns the dependency which could not be satisfied in the
* event of an error
* @return 0 on success, with [pkg] and all of its dependencies not already on
* the [*packages] list added to that list, or -1 on failure due to an
* unresolvable dependency, in which case the [*packages] list will be
* unmodified by this function
*/
int _alpm_resolvedeps(pmhandle_t *handle, alpm_list_t *localpkgs, pmpkg_t *pkg,
alpm_list_t *preferred, alpm_list_t **packages,
alpm_list_t *remove, alpm_list_t **data)
{
int ret = 0;
alpm_list_t *i, *j;
alpm_list_t *targ;
alpm_list_t *deps = NULL;
alpm_list_t *packages_copy;
if(_alpm_pkg_find(*packages, pkg->name) != NULL) {
return 0;
}
/* Create a copy of the packages list, so that it can be restored
on error */
packages_copy = alpm_list_copy(*packages);
/* [pkg] has not already been resolved into the packages list, so put it
on that list */
*packages = alpm_list_add(*packages, pkg);
_alpm_log(handle, PM_LOG_DEBUG, "started resolving dependencies\n");
for(i = alpm_list_last(*packages); i; i = i->next) {
pmpkg_t *tpkg = i->data;
targ = alpm_list_add(NULL, tpkg);
deps = alpm_checkdeps(handle, localpkgs, remove, targ, 0);
alpm_list_free(targ);
for(j = deps; j; j = j->next) {
pmdepmissing_t *miss = j->data;
pmdepend_t *missdep = miss->depend;
/* check if one of the packages in the [*packages] list already satisfies
* this dependency */
if(find_dep_satisfier(*packages, missdep)) {
_alpm_depmiss_free(miss);
continue;
}
/* check if one of the packages in the [preferred] list already satisfies
* this dependency */
pmpkg_t *spkg = find_dep_satisfier(preferred, missdep);
if(!spkg) {
/* find a satisfier package in the given repositories */
spkg = resolvedep(handle, missdep, handle->dbs_sync, *packages, 0);
}
if(!spkg) {
handle->pm_errno = PM_ERR_UNSATISFIED_DEPS;
char *missdepstring = alpm_dep_compute_string(missdep);
_alpm_log(handle, PM_LOG_WARNING,
_("cannot resolve \"%s\", a dependency of \"%s\"\n"),
missdepstring, tpkg->name);
free(missdepstring);
if(data) {
*data = alpm_list_add(*data, miss);
}
ret = -1;
} else {
_alpm_log(handle, PM_LOG_DEBUG, "pulling dependency %s (needed by %s)\n",
alpm_pkg_get_name(spkg), alpm_pkg_get_name(tpkg));
*packages = alpm_list_add(*packages, spkg);
_alpm_depmiss_free(miss);
}
}
alpm_list_free(deps);
}
if(ret != 0) {
alpm_list_free(*packages);
*packages = packages_copy;
} else {
alpm_list_free(packages_copy);
}
_alpm_log(handle, PM_LOG_DEBUG, "finished resolving dependencies\n");
return ret;
}
