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libalpm/package.c : add new alpm_pkg_compute_requiredby function.

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Signed-off-by: Chantry Xavier <shiningxc@gmail.com>
This commit is contained in:
Chantry Xavier 2007-08-26 01:07:02 +02:00 committed by Dan McGee
parent 2f0de317b8
commit be32aa3004
2 changed files with 48 additions and 38 deletions
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1
lib/libalpm/alpm.h
View File

@ -195,6 +195,7 @@ int alpm_pkg_checkmd5sum(pmpkg_t *pkg);
char *alpm_fetch_pkgurl(const char *url);
int alpm_pkg_vercmp(const char *ver1, const char *ver2);
char *alpm_pkg_name_hasarch(const char *pkgname);
alpm_list_t *alpm_pkg_compute_requiredby(pmpkg_t *pkg);
const char *alpm_pkg_get_filename(pmpkg_t *pkg);
const char *alpm_pkg_get_name(pmpkg_t *pkg);

85
lib/libalpm/package.c
View File

@ -533,6 +533,51 @@ unsigned short SYMEXPORT alpm_pkg_has_scriptlet(pmpkg_t *pkg)
return pkg->scriptlet;
}
/**
* @brief Compute the packages requiring a given package.
* @param pkg a package
* @return the list of packages requiring pkg
*
* A depends on B through n depends <=> A listed in B's requiredby n times
* n == 0 or 1 in almost all cases */
alpm_list_t SYMEXPORT *alpm_pkg_compute_requiredby(pmpkg_t *pkg)
{
const alpm_list_t *i, *j;
alpm_list_t *reqs = NULL;
pmdb_t *localdb = alpm_option_get_localdb();
for(i = _alpm_db_get_pkgcache(localdb); i; i = i->next) {
if(!i->data) {
continue;
}
pmpkg_t *cachepkg = i->data;
const char *cachepkgname = alpm_pkg_get_name(cachepkg);
for(j = alpm_pkg_get_depends(cachepkg); j; j = j->next) {
pmdepend_t *dep;
int satisfies;
if(!j->data) {
continue;
}
dep = alpm_splitdep(j->data);
if(dep == NULL) {
continue;
}
satisfies = alpm_depcmp(pkg, dep);
FREE(dep);
if(satisfies) {
_alpm_log(PM_LOG_DEBUG, "adding '%s' in requiredby field for '%s'\n",
cachepkgname, pkg->name);
reqs = alpm_list_add(reqs, strdup(cachepkgname));
break;
}
}
}
return(reqs);
}
/** @} */
/* this function was taken from rpm 4.0.4 and rewritten */
@ -1107,47 +1152,11 @@ int _alpm_pkg_splitname(const char *target, char *name, char *version, int witha
return(0);
}
/* scan the local db to fill in requiredby field of package,
/* fill in requiredby field of package,
* used when we want to install or add a package */
/* A depends on B through n depends <=> A listed in B's requiredby n times
* n == 0 or 1 in almost all cases */
void _alpm_pkg_update_requiredby(pmpkg_t *pkg)
{
const alpm_list_t *i, *j;
pmdb_t *localdb = alpm_option_get_localdb();
for(i = _alpm_db_get_pkgcache(localdb); i; i = i->next) {
if(!i->data) {
continue;
}
pmpkg_t *cachepkg = i->data;
const char *cachepkgname = alpm_pkg_get_name(cachepkg);
for(j = alpm_pkg_get_depends(cachepkg); j; j = j->next) {
pmdepend_t *dep;
int satisfies;
if(!j->data) {
continue;
}
dep = alpm_splitdep(j->data);
if(dep == NULL) {
continue;
}
satisfies = alpm_depcmp(pkg, dep);
FREE(dep);
if(satisfies) {
alpm_list_t *reqs = alpm_pkg_get_requiredby(pkg);
_alpm_log(PM_LOG_DEBUG, "adding '%s' in requiredby field for '%s'\n",
cachepkgname, pkg->name);
reqs = alpm_list_add(reqs, strdup(cachepkgname));
pkg->requiredby = reqs;
break;
}
}
}
pkg->requiredby = alpm_pkg_compute_requiredby(pkg);
}
/* TODO this should either be public, or done somewhere else */