Store and read name of alternatives

Add the names of supplied alternatives to the .PKGINFO file.  Read and store
these values in libalpm.  This information is currently not used anywhere.

Signed-off-by: Allan McRae <allan@archlinux.org>

lib/libalpm/alpm.h

@@ -2555,6 +2555,12 @@ alpm_filelist_t *alpm_pkg_get_files(alpm_pkg_t *pkg);
  */
 alpm_list_t *alpm_pkg_get_backup(alpm_pkg_t *pkg);
 
+/** Returns the list of alternatives provided by the package
+ * @param pkg a pointer to package
+ * @return a reference to a list of char* objects
+ */
+alpm_list_t *alpm_pkg_get_alternatives(alpm_pkg_t *pkg);
+
 /** Returns the database containing pkg.
  * Returns a pointer to the alpm_db_t structure the package is
  * originating from, or NULL if the package was loaded from a file.

lib/libalpm/be_local.c

@@ -195,6 +195,12 @@ static alpm_list_t *_cache_get_backup(alpm_pkg_t *pkg)
 	return pkg->backup;
 }
 
+static alpm_list_t *_cache_get_alternatives(alpm_pkg_t *pkg)
+{
+	LAZY_LOAD(INFRQ_DESC);
+	return pkg->alternatives;
+}
+
 /**
  * Open a package changelog for reading. Similar to fopen in functionality,
  * except that the returned 'file stream' is from the database.
@@ -349,6 +355,7 @@ static const struct pkg_operations local_pkg_ops = {
 	.get_replaces = _cache_get_replaces,
 	.get_files = _cache_get_files,
 	.get_backup = _cache_get_backup,
+	.get_alternatives = _cache_get_alternatives,
 
 	.changelog_open = _cache_changelog_open,
 	.changelog_read = _cache_changelog_read,
@@ -804,6 +811,8 @@ static int local_db_read(alpm_pkg_t *info, int inforeq)
 				READ_AND_SPLITDEP(info->conflicts);
 			} else if(strcmp(line, "%PROVIDES%") == 0) {
 				READ_AND_SPLITDEP(info->provides);
+			} else if(strcmp(line, "%ALTERNATIVES%") == 0) {
+				READ_AND_STORE_ALL(info->alternatives);
 			}
 		}
 		fclose(fp);
@@ -1040,6 +1049,15 @@ int _alpm_local_db_write(alpm_db_t *db, alpm_pkg_t *info, int inforeq)
 		write_deps(fp, "%CONFLICTS%", info->conflicts);
 		write_deps(fp, "%PROVIDES%", info->provides);
 
+		if(info->alternatives) {
+			fputs("%ALTERNATIVES%\n", fp);
+			for(lp = info->alternatives; lp; lp = lp->next) {
+				fputs(lp->data, fp);
+				fputc('\n', fp);
+			}
+			fputc('\n', fp);
+		}
+
 		fclose(fp);
 		fp = NULL;
 	}

lib/libalpm/be_package.c

@@ -244,6 +244,8 @@ static int parse_descfile(alpm_handle_t *handle, struct archive *a, alpm_pkg_t *
 				CALLOC(backup, 1, sizeof(alpm_backup_t), return -1);
 				STRDUP(backup->name, ptr, FREE(backup); return -1);
 				newpkg->backup = alpm_list_add(newpkg->backup, backup);
+			} else if(strcmp(key, "alternative") == 0) {
+				newpkg->alternatives = alpm_list_add(newpkg->alternatives, strdup(ptr));
 			} else if(strcmp(key, "force") == 0) {
 				/* deprecated, skip it */
 			} else if(strcmp(key, "makepkgopt") == 0) {

lib/libalpm/package.c

@@ -98,6 +98,7 @@ static alpm_list_t *_pkg_get_provides(alpm_pkg_t *pkg)   { return pkg->provides;
 static alpm_list_t *_pkg_get_replaces(alpm_pkg_t *pkg)   { return pkg->replaces; }
 static alpm_filelist_t *_pkg_get_files(alpm_pkg_t *pkg)  { return &(pkg->files); }
 static alpm_list_t *_pkg_get_backup(alpm_pkg_t *pkg)     { return pkg->backup; }
+static alpm_list_t *_pkg_get_alternatives(alpm_pkg_t *pkg) { return pkg->alternatives; }
 
 static void *_pkg_changelog_open(alpm_pkg_t UNUSED *pkg)
 {
@@ -162,6 +163,7 @@ const struct pkg_operations default_pkg_ops = {
 	.get_replaces    = _pkg_get_replaces,
 	.get_files       = _pkg_get_files,
 	.get_backup      = _pkg_get_backup,
+	.get_alternatives = _pkg_get_alternatives,
 
 	.changelog_open  = _pkg_changelog_open,
 	.changelog_read  = _pkg_changelog_read,
@@ -418,6 +420,13 @@ alpm_list_t SYMEXPORT *alpm_pkg_get_backup(alpm_pkg_t *pkg)
 	return pkg->ops->get_backup(pkg);
 }
 
+alpm_list_t SYMEXPORT *alpm_pkg_get_alternatives(alpm_pkg_t *pkg)
+{
+	ASSERT(pkg != NULL, return NULL);
+	pkg->handle->pm_errno = ALPM_ERR_OK;
+	return pkg->ops->get_alternatives(pkg);
+}
+
 alpm_db_t SYMEXPORT *alpm_pkg_get_db(alpm_pkg_t *pkg)
 {
 	/* Sanity checks */
@@ -632,6 +641,7 @@ int _alpm_pkg_dup(alpm_pkg_t *pkg, alpm_pkg_t **new_ptr)
 	newpkg->optdepends = list_depdup(pkg->optdepends);
 	newpkg->conflicts  = list_depdup(pkg->conflicts);
 	newpkg->provides   = list_depdup(pkg->provides);
+	newpkg->alternatives = alpm_list_strdup(pkg->alternatives);
 
 	if(pkg->files.count) {
 		size_t filenum;
@@ -709,6 +719,7 @@ void _alpm_pkg_free(alpm_pkg_t *pkg)
 	free_deplist(pkg->provides);
 	alpm_list_free(pkg->removes);
 	_alpm_pkg_free(pkg->oldpkg);
+	FREELIST(pkg->alternatives);
 
 	if(pkg->origin == ALPM_PKG_FROM_FILE) {
 		FREE(pkg->origin_data.file);

lib/libalpm/package.h

@@ -66,6 +66,7 @@ struct pkg_operations {
 	alpm_list_t *(*get_replaces) (alpm_pkg_t *);
 	alpm_filelist_t *(*get_files) (alpm_pkg_t *);
 	alpm_list_t *(*get_backup) (alpm_pkg_t *);
+	alpm_list_t *(*get_alternatives) (alpm_pkg_t *);
 
 	void *(*changelog_open) (alpm_pkg_t *);
 	size_t (*changelog_read) (void *, size_t, const alpm_pkg_t *, void *);
@@ -120,6 +121,7 @@ struct _alpm_pkg_t {
 	alpm_list_t *provides;
 	alpm_list_t *removes; /* in transaction targets only */
 	alpm_pkg_t *oldpkg; /* in transaction targets only */
+	alpm_list_t *alternatives;
 
 	const struct pkg_operations *ops;
 

scripts/makepkg.sh.in

@@ -630,6 +630,7 @@ write_pkginfo() {
 	write_kv_pair "optdepend"   "${optdepends[@]//+([[:space:]])/ }"
 	write_kv_pair "makedepend"  "${makedepends[@]}"
 	write_kv_pair "checkdepend" "${checkdepends[@]}"
+	write_kv_pair "alternative" "${alternative[@]}"
 }
 
 write_buildinfo() {