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pacman/lib/libalpm/deps.c
Dan McGee a57b2f233f Remove FREELISTPTR macro 
Signed-off-by: Dan McGee <dan@archlinux.org>
2007-04-28 03:54:25 -04:00

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21 KiB
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/*
* deps.c
*
* Copyright (c) 2002-2006 by Judd Vinet <jvinet@zeroflux.org>
* Copyright (c) 2005 by Aurelien Foret <orelien@chez.com>
* Copyright (c) 2005, 2006 by Miklos Vajna <vmiklos@frugalware.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
* USA.
*/
#include "config.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#ifdef __sun__
#include <strings.h>
#endif
#include <math.h>
/* libalpm */
#include "deps.h"
#include "alpm_list.h"
#include "util.h"
#include "log.h"
#include "error.h"
#include "package.h"
#include "db.h"
#include "cache.h"
#include "provide.h"
#include "versioncmp.h"
#include "handle.h"
extern pmhandle_t *handle;
pmdepmissing_t *_alpm_depmiss_new(const char *target, pmdeptype_t type,
pmdepmod_t depmod, const char *depname,
const char *depversion)
{
pmdepmissing_t *miss;
ALPM_LOG_FUNC;
miss = (pmdepmissing_t *)malloc(sizeof(pmdepmissing_t));
if(miss == NULL) {
_alpm_log(PM_LOG_ERROR, _("malloc failure: could not allocate %d bytes"), sizeof(pmdepmissing_t));
RET_ERR(PM_ERR_MEMORY, NULL);
}
STRNCPY(miss->target, target, PKG_NAME_LEN);
miss->type = type;
miss->depend.mod = depmod;
STRNCPY(miss->depend.name, depname, PKG_NAME_LEN);
if(depversion) {
STRNCPY(miss->depend.version, depversion, PKG_VERSION_LEN);
} else {
miss->depend.version[0] = 0;
}
return(miss);
}
int _alpm_depmiss_isin(pmdepmissing_t *needle, alpm_list_t *haystack)
{
alpm_list_t *i;
ALPM_LOG_FUNC;
for(i = haystack; i; i = i->next) {
pmdepmissing_t *miss = i->data;
if(!memcmp(needle, miss, sizeof(pmdepmissing_t))
&& !memcmp(&needle->depend, &miss->depend, sizeof(pmdepend_t))) {
return(1);
}
}
return(0);
}
/* Re-order a list of target packages with respect to their dependencies.
*
* Example (PM_TRANS_TYPE_ADD):
* A depends on C
* B depends on A
* Target order is A,B,C,D
*
* Should be re-ordered to C,A,B,D
*
* mode should be either PM_TRANS_TYPE_ADD or PM_TRANS_TYPE_REMOVE. This
* affects the dependency order sortbydeps() will use.
*
* This function returns the new alpm_list_t* target list.
*
*/
alpm_list_t *_alpm_sortbydeps(alpm_list_t *targets, pmtranstype_t mode)
{
alpm_list_t *newtargs = NULL;
alpm_list_t *i, *j, *k, *l;
int change = 1;
int numscans = 0;
int numtargs = 0;
int maxscans;
ALPM_LOG_FUNC;
if(targets == NULL) {
return(NULL);
}
for(i = targets; i; i = i->next) {
newtargs = alpm_list_add(newtargs, i->data);
numtargs++;
}
maxscans = (int)sqrt(numtargs);
_alpm_log(PM_LOG_DEBUG, _("started sorting dependencies"));
while(change) {
alpm_list_t *tmptargs = NULL;
change = 0;
if(numscans > maxscans) {
_alpm_log(PM_LOG_DEBUG, _("possible dependency cycle detected"));
continue;
}
numscans++;
/* run thru targets, moving up packages as necessary */
for(i = newtargs; i; i = i->next) {
pmpkg_t *p = i->data;
_alpm_log(PM_LOG_DEBUG, " sorting %s", alpm_pkg_get_name(p));
for(j = alpm_pkg_get_depends(p); j; j = j->next) {
pmdepend_t *depend = alpm_splitdep(j->data);
pmpkg_t *q = NULL;
if(depend == NULL) {
continue;
}
/* look for depend->name -- if it's farther down in the list, then
* move it up above p
*/
for(k = i->next; k; k = k->next) {
q = k->data;
const char *qname = alpm_pkg_get_name(q);
if(!strcmp(depend->name, qname)) {
if(!_alpm_pkg_find(qname, tmptargs)) {
change = 1;
tmptargs = alpm_list_add(tmptargs, q);
}
break;
}
for(l = alpm_pkg_get_provides(q); l; l = l->next) {
const char *provname = l->data;
if(!strcmp(depend->name, provname)) {
if(!_alpm_pkg_find(qname, tmptargs)) {
change = 1;
tmptargs = alpm_list_add(tmptargs, q);
}
break;
}
}
}
free(depend);
}
if(!_alpm_pkg_find(alpm_pkg_get_name(p), tmptargs)) {
tmptargs = alpm_list_add(tmptargs, p);
}
}
alpm_list_free(newtargs);
newtargs = tmptargs;
}
_alpm_log(PM_LOG_DEBUG, _("sorting dependencies finished"));
if(mode == PM_TRANS_TYPE_REMOVE) {
/* we're removing packages, so reverse the order */
alpm_list_t *tmptargs = alpm_list_reverse(newtargs);
/* free the old one */
alpm_list_free(newtargs);
newtargs = tmptargs;
}
return(newtargs);
}
/** Checks dependencies and returns missing ones in a list. Dependencies can include versions with depmod operators.
* @param trans pointer to the transaction object
* @param db pointer to the local package database
* @param op transaction type
* @param packages an alpm_list_t* of packages to be checked
* @return an alpm_list_t* of missing_t pointers.
*/
alpm_list_t *_alpm_checkdeps(pmtrans_t *trans, pmdb_t *db, pmtranstype_t op,
alpm_list_t *packages)
{
alpm_list_t *i, *j, *k, *l;
int found = 0;
alpm_list_t *baddeps = NULL;
pmdepmissing_t *miss = NULL;
ALPM_LOG_FUNC;
if(db == NULL) {
return(NULL);
}
if(op == PM_TRANS_TYPE_UPGRADE) {
/* PM_TRANS_TYPE_UPGRADE handles the backwards dependencies, ie, the packages
* listed in the requiredby field.
*/
for(i = packages; i; i = i->next) {
pmpkg_t *newpkg = i->data;
pmpkg_t *oldpkg;
if(newpkg == NULL) {
_alpm_log(PM_LOG_DEBUG, _("null package found in package list"));
continue;
}
if((oldpkg = _alpm_db_get_pkgfromcache(db, alpm_pkg_get_name(newpkg))) == NULL) {
_alpm_log(PM_LOG_DEBUG, _("cannot find package installed '%s'"),
alpm_pkg_get_name(newpkg));
continue;
}
for(j = alpm_pkg_get_requiredby(oldpkg); j; j = j->next) {
pmpkg_t *p;
found = 0;
if((p = _alpm_db_get_pkgfromcache(db, j->data)) == NULL) {
/* hmmm... package isn't installed.. */
continue;
}
if(_alpm_pkg_find(alpm_pkg_get_name(p), packages)) {
/* this package also in the upgrade list, so don't worry about it */
continue;
}
for(k = alpm_pkg_get_depends(p); k; k = k->next) {
/* don't break any existing dependencies (possible provides) */
pmdepend_t *depend = alpm_splitdep(k->data);
if(depend == NULL) {
continue;
}
/* if oldpkg satisfied this dep, and newpkg doesn't */
if(alpm_depcmp(oldpkg, depend) && !alpm_depcmp(newpkg, depend)) {
/* we've found a dep that was removed... see if any other package
* still contains/provides the dep */
int satisfied = 0;
for(l = packages; l; l = l->next) {
pmpkg_t *pkg = l->data;
if(alpm_depcmp(pkg, depend)) {
_alpm_log(PM_LOG_DEBUG, _("checkdeps: dependency '%s' has moved from '%s' to '%s'"),
depend->name, alpm_pkg_get_name(oldpkg), alpm_pkg_get_name(pkg));
satisfied = 1;
break;
}
}
if(!satisfied) {
/* worst case... check installed packages to see if anything else
* satisfies this... */
for(l = _alpm_db_get_pkgcache(db); l; l = l->next) {
pmpkg_t *pkg = l->data;
if(strcmp(alpm_pkg_get_name(pkg), alpm_pkg_get_name(oldpkg)) == 0) {
/* well, we know this one succeeds, but we're removing it... skip it */
continue;
}
if(alpm_depcmp(pkg, depend)) {
_alpm_log(PM_LOG_DEBUG, _("checkdeps: dependency '%s' satisfied by installed package '%s'"),
depend->name, alpm_pkg_get_name(pkg));
satisfied = 1;
break;
}
}
}
if(!satisfied) {
_alpm_log(PM_LOG_DEBUG, _("checkdeps: updated '%s' won't satisfy a dependency of '%s'"),
alpm_pkg_get_name(oldpkg), alpm_pkg_get_name(p));
miss = _alpm_depmiss_new(p->name, PM_DEP_TYPE_DEPEND, depend->mod,
depend->name, depend->version);
if(!_alpm_depmiss_isin(miss, baddeps)) {
baddeps = alpm_list_add(baddeps, miss);
} else {
FREE(miss);
}
}
}
free(depend);
}
}
}
}
if(op == PM_TRANS_TYPE_ADD || op == PM_TRANS_TYPE_UPGRADE) {
/* DEPENDENCIES -- look for unsatisfied dependencies */
for(i = packages; i; i = i->next) {
pmpkg_t *tp = i->data;
if(tp == NULL) {
_alpm_log(PM_LOG_DEBUG, _("null package found in package list"));
continue;
}
for(j = alpm_pkg_get_depends(tp); j; j = j->next) {
/* split into name/version pairs */
pmdepend_t *depend = alpm_splitdep((char*)j->data);
if(depend == NULL) {
continue;
}
found = 0;
/* check database for literal packages */
for(k = _alpm_db_get_pkgcache(db); k && !found; k = k->next) {
pmpkg_t *p = (pmpkg_t *)k->data;
found = alpm_depcmp(p, depend);
}
/* check database for provides matches */
if(!found) {
alpm_list_t *m;
for(m = _alpm_db_whatprovides(db, depend->name); m && !found; m = m->next) {
/* look for a match that isn't one of the packages we're trying
* to install. this way, if we match against a to-be-installed
* package, we'll defer to the NEW one, not the one already
* installed. */
pmpkg_t *p = m->data;
alpm_list_t *n;
int skip = 0;
for(n = packages; n && !skip; n = n->next) {
pmpkg_t *ptp = n->data;
if(strcmp(alpm_pkg_get_name(ptp), alpm_pkg_get_name(p)) == 0) {
skip = 1;
}
}
if(skip) {
continue;
}
found = alpm_depcmp(p, depend);
}
}
/* check other targets */
for(k = packages; k && !found; k = k->next) {
pmpkg_t *p = k->data;
found = alpm_depcmp(p, depend);
}
/* else if still not found... */
if(!found) {
_alpm_log(PM_LOG_DEBUG, _("missing dependency '%s' for package '%s'"),
depend->name, alpm_pkg_get_name(tp));
miss = _alpm_depmiss_new(alpm_pkg_get_name(tp), PM_DEP_TYPE_DEPEND, depend->mod,
depend->name, depend->version);
if(!_alpm_depmiss_isin(miss, baddeps)) {
baddeps = alpm_list_add(baddeps, miss);
} else {
FREE(miss);
}
}
free(depend);
}
}
} else if(op == PM_TRANS_TYPE_REMOVE) {
/* check requiredby fields */
for(i = packages; i; i = i->next) {
pmpkg_t *tp = i->data;
if(tp == NULL) {
continue;
}
found=0;
for(j = alpm_pkg_get_requiredby(tp); j; j = j->next) {
/* Search for 'reqname' in packages for removal */
char *reqname = j->data;
alpm_list_t *x = NULL;
for(x = packages; x; x = x->next) {
pmpkg_t *xp = x->data;
if(strcmp(reqname, alpm_pkg_get_name(xp)) == 0) {
found = 1;
break;
}
}
if(!found) {
/* check if a package in trans->packages provides this package */
for(k = trans->packages; !found && k; k=k->next) {
pmpkg_t *spkg = NULL;
if(trans->type == PM_TRANS_TYPE_SYNC) {
pmsyncpkg_t *sync = k->data;
spkg = sync->pkg;
} else {
spkg = k->data;
}
if(spkg) {
if(alpm_list_find_str(alpm_pkg_get_provides(spkg), tp->name)) {
found = 1;
}
}
}
if(!found) {
_alpm_log(PM_LOG_DEBUG, _("checkdeps: found %s as required by %s"),
reqname, alpm_pkg_get_name(tp));
miss = _alpm_depmiss_new(alpm_pkg_get_name(tp), PM_DEP_TYPE_DEPEND,
PM_DEP_MOD_ANY, j->data, NULL);
if(!_alpm_depmiss_isin(miss, baddeps)) {
baddeps = alpm_list_add(baddeps, miss);
} else {
FREE(miss);
}
}
}
}
}
}
return(baddeps);
}
pmdepend_t SYMEXPORT *alpm_splitdep(const char *depstring)
{
pmdepend_t *depend;
char *ptr = NULL;
if(depstring == NULL) {
return(NULL);
}
depend = (pmdepend_t *)malloc(sizeof(pmdepend_t));
if(depend == NULL) {
_alpm_log(PM_LOG_ERROR, _("malloc failure: could not allocate %d bytes"), sizeof(pmdepend_t));
return(NULL);
}
/* Find a version comparator if one exists. If it does, set the type and
* increment the ptr accordingly so we can copy the right strings. */
if((ptr = strstr(depstring, ">="))) {
depend->mod = PM_DEP_MOD_GE;
*ptr = '\0';
ptr += 2;
} else if((ptr = strstr(depstring, "<="))) {
depend->mod = PM_DEP_MOD_LE;
*ptr = '\0';
ptr += 2;
} else if((ptr = strstr(depstring, "="))) {
depend->mod = PM_DEP_MOD_EQ;
*ptr = '\0';
ptr += 1;
} else {
/* no version specified - copy in the name and return it */
depend->mod = PM_DEP_MOD_ANY;
strncpy(depend->name, depstring, PKG_NAME_LEN);
depend->version[0] = '\0';
return(depend);
}
/* if we get here, we have a version comparator, copy the right parts
* to the right places */
strncpy(depend->name, depstring, PKG_NAME_LEN);
strncpy(depend->version, ptr, PKG_VERSION_LEN);
return(depend);
}
/* These parameters are messy. We check if this package, given a list of
* targets (and a db), is safe to remove. We do NOT remove it if it is in the
* target list */
static int can_remove_package(pmdb_t *db, pmpkg_t *pkg, alpm_list_t *targets)
{
alpm_list_t *i;
if(_alpm_pkg_find(alpm_pkg_get_name(pkg), targets)) {
return(0);
}
/* see if it was explicitly installed */
if(alpm_pkg_get_reason(pkg) == PM_PKG_REASON_EXPLICIT) {
_alpm_log(PM_LOG_DEBUG, _("excluding %s -- explicitly installed"), alpm_pkg_get_name(pkg));
return(0);
}
/* see if other packages need it */
for(i = alpm_pkg_get_requiredby(pkg); i; i = i->next) {
pmpkg_t *reqpkg = _alpm_db_get_pkgfromcache(db, i->data);
if(reqpkg && !_alpm_pkg_find(alpm_pkg_get_name(reqpkg), targets)) {
return(0);
}
}
/* it's ok to remove */
return(1);
}
/* return a new alpm_list_t target list containing all packages in the original
* target list, as well as all their un-needed dependencies. By un-needed,
* I mean dependencies that are *only* required for packages in the target
* list, so they can be safely removed. This function is recursive.
*/
alpm_list_t *_alpm_removedeps(pmdb_t *db, alpm_list_t *targs)
{
alpm_list_t *i, *j, *k;
alpm_list_t *newtargs = targs;
ALPM_LOG_FUNC;
if(db == NULL) {
return(newtargs);
}
for(i = targs; i; i = i->next) {
pmpkg_t *pkg = i->data;
for(j = alpm_pkg_get_depends(pkg); j; j = j->next) {
pmdepend_t *depend = alpm_splitdep(j->data);
pmpkg_t *deppkg;
if(depend == NULL) {
continue;
}
deppkg = _alpm_db_get_pkgfromcache(db, depend->name);
if(deppkg == NULL) {
/* package not found... look for a provision instead */
alpm_list_t *provides = _alpm_db_whatprovides(db, depend->name);
if(!provides) {
/* Not found, that's fine, carry on */
_alpm_log(PM_LOG_DEBUG, _("cannot find package \"%s\" or anything that provides it!"), depend->name);
continue;
}
for(k = provides; k; k = k->next) {
pmpkg_t *provpkg = k->data;
if(can_remove_package(db, provpkg, newtargs)) {
pmpkg_t *pkg = _alpm_pkg_dup(provpkg);
_alpm_log(PM_LOG_DEBUG, _("adding '%s' to the targets"), alpm_pkg_get_name(pkg));
/* add it to the target list */
newtargs = alpm_list_add(newtargs, pkg);
newtargs = _alpm_removedeps(db, newtargs);
}
}
alpm_list_free(provides);
} else if(can_remove_package(db, deppkg, newtargs)) {
pmpkg_t *pkg = _alpm_pkg_dup(deppkg);
_alpm_log(PM_LOG_DEBUG, _("adding '%s' to the targets"), alpm_pkg_get_name(pkg));
/* add it to the target list */
newtargs = alpm_list_add(newtargs, pkg);
newtargs = _alpm_removedeps(db, newtargs);
}
free(depend);
}
}
return(newtargs);
}
/* populates *list with packages that need to be installed to satisfy all
* dependencies (recursive) for syncpkg
*
* make sure *list and *trail are already initialized
*/
int _alpm_resolvedeps(pmdb_t *local, alpm_list_t *dbs_sync, pmpkg_t *syncpkg,
alpm_list_t *list, alpm_list_t *trail, pmtrans_t *trans,
alpm_list_t **data)
{
alpm_list_t *i, *j;
alpm_list_t *targ;
alpm_list_t *deps = NULL;
ALPM_LOG_FUNC;
if(local == NULL || dbs_sync == NULL || syncpkg == NULL) {
return(-1);
}
_alpm_log(PM_LOG_DEBUG, _("started resolving dependencies"));
targ = alpm_list_add(NULL, syncpkg);
deps = _alpm_checkdeps(trans, local, PM_TRANS_TYPE_ADD, targ);
alpm_list_free(targ);
if(deps == NULL) {
return(0);
}
for(i = deps; i; i = i->next) {
int found = 0;
pmdepmissing_t *miss = i->data;
pmpkg_t *sync = NULL;
/* check if one of the packages in *list already provides this dependency */
for(j = list; j && !found; j = j->next) {
pmpkg_t *sp = j->data;
if(alpm_list_find_str(alpm_pkg_get_provides(sp), miss->depend.name)) {
_alpm_log(PM_LOG_DEBUG, _("%s provides dependency %s -- skipping"),
alpm_pkg_get_name(sp), miss->depend.name);
found = 1;
}
}
if(found) {
continue;
}
/* find the package in one of the repositories */
/* check literals */
for(j = dbs_sync; !sync && j; j = j->next) {
sync = _alpm_db_get_pkgfromcache(j->data, miss->depend.name);
}
/*TODO this autoresolves the first 'provides' package... we should fix this
* somehow */
/* check provides */
if(!sync) {
for(j = dbs_sync; !sync && j; j = j->next) {
alpm_list_t *provides;
provides = _alpm_db_whatprovides(j->data, miss->depend.name);
if(provides) {
sync = provides->data;
}
alpm_list_free(provides);
}
}
if(!sync) {
_alpm_log(PM_LOG_ERROR, _("cannot resolve dependencies for \"%s\" (\"%s\" is not in the package set)"),
miss->target, miss->depend.name);
if(data) {
if((miss = (pmdepmissing_t *)malloc(sizeof(pmdepmissing_t))) == NULL) {
_alpm_log(PM_LOG_ERROR, _("malloc failure: could not allocate %d bytes"), sizeof(pmdepmissing_t));
FREELIST(*data);
pm_errno = PM_ERR_MEMORY;
goto error;
}
*miss = *(pmdepmissing_t *)i->data;
*data = alpm_list_add(*data, miss);
}
pm_errno = PM_ERR_UNSATISFIED_DEPS;
goto error;
}
if(_alpm_pkg_find(alpm_pkg_get_name(sync), list)) {
/* this dep is already in the target list */
_alpm_log(PM_LOG_DEBUG, _("dependency %s is already in the target list -- skipping"),
alpm_pkg_get_name(sync));
continue;
}
if(!_alpm_pkg_find(alpm_pkg_get_name(sync), trail)) {
/* check pmo_ignorepkg and pmo_s_ignore to make sure we haven't pulled in
* something we're not supposed to.
*/
int usedep = 1;
if(alpm_list_find_str(handle->ignorepkg, alpm_pkg_get_name(sync))) {
pmpkg_t *dummypkg = _alpm_pkg_new(miss->target, NULL);
QUESTION(trans, PM_TRANS_CONV_INSTALL_IGNOREPKG, dummypkg, sync, NULL, &usedep);
_alpm_pkg_free(dummypkg);
}
if(usedep) {
trail = alpm_list_add(trail, sync);
if(_alpm_resolvedeps(local, dbs_sync, sync, list, trail, trans, data)) {
goto error;
}
_alpm_log(PM_LOG_DEBUG, _("pulling dependency %s (needed by %s)"),
alpm_pkg_get_name(sync), alpm_pkg_get_name(syncpkg));
list = alpm_list_add(list, sync);
} else {
_alpm_log(PM_LOG_ERROR, _("cannot resolve dependencies for \"%s\""), miss->target);
if(data) {
if((miss = (pmdepmissing_t *)malloc(sizeof(pmdepmissing_t))) == NULL) {
_alpm_log(PM_LOG_ERROR, _("malloc failure: could not allocate %d bytes"), sizeof(pmdepmissing_t));
FREELIST(*data);
pm_errno = PM_ERR_MEMORY;
goto error;
}
*miss = *(pmdepmissing_t *)i->data;
*data = alpm_list_add(*data, miss);
}
pm_errno = PM_ERR_UNSATISFIED_DEPS;
goto error;
}
} else {
/* cycle detected -- skip it */
_alpm_log(PM_LOG_DEBUG, _("dependency cycle detected: %s"), sync->name);
}
}
_alpm_log(PM_LOG_DEBUG, _("finished resolving dependencies"));
FREELIST(deps);
return(0);
error:
FREELIST(deps);
return(-1);
}
const char SYMEXPORT *alpm_dep_get_target(pmdepmissing_t *miss)
{
ALPM_LOG_FUNC;
/* Sanity checks */
ASSERT(handle != NULL, return(NULL));
ASSERT(miss != NULL, return(NULL));
return miss->target;
}
pmdeptype_t SYMEXPORT alpm_dep_get_type(pmdepmissing_t *miss)
{
ALPM_LOG_FUNC;
/* Sanity checks */
ASSERT(handle != NULL, return(-1));
ASSERT(miss != NULL, return(-1));
return miss->type;
}
pmdepmod_t SYMEXPORT alpm_dep_get_mod(pmdepmissing_t *miss)
{
ALPM_LOG_FUNC;
/* Sanity checks */
ASSERT(handle != NULL, return(-1));
ASSERT(miss != NULL, return(-1));
return miss->depend.mod;
}
const char SYMEXPORT *alpm_dep_get_name(pmdepmissing_t *miss)
{
ALPM_LOG_FUNC;
/* Sanity checks */
ASSERT(handle != NULL, return(NULL));
ASSERT(miss != NULL, return(NULL));
return miss->depend.name;
}
const char SYMEXPORT *alpm_dep_get_version(pmdepmissing_t *miss)
{
ALPM_LOG_FUNC;
/* Sanity checks */
ASSERT(handle != NULL, return(NULL));
ASSERT(miss != NULL, return(NULL));
return miss->depend.version;
}
/* vim: set ts=2 sw=2 noet: */
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