Added support for package conflicts.

NEWS

@@ -1,5 +1,10 @@
 xbps-0.16 (???):
 
+ * Added support for package conflicts. If any conflicting pkg has been found
+   in a transaction, xbps_transaction_prepare() will return EAGAIN and
+   the array object "conflicts" in transaction dictionary must be inspected
+   to know what conflicts have been found.
+
  * Always require an underscore at package versions, if any provided
    pkgver (i.e 'foo-1.0_1') does not contain an underscore the name/version
    won't be detected for a string. That means that now any package can contain

TODO

@@ -1,5 +1,4 @@
 libxbps:
- - conflicts: the object is there but is not handled yet (ETA 0.16)
  - properties: (update-first) still unimplemented.
 
 xbps-repo:

bin/xbps-bin/transaction.c

@@ -50,16 +50,26 @@ struct transaction {
 static void
 show_missing_deps(prop_array_t a)
 {
-	prop_object_t obj;
 	size_t i;
+	const char *str;
 
-	fprintf(stderr,
+	fprintf(stderr, "xbps-bin: unable to locate some required packages:\n");
-	    "xbps-bin: unable to locate some required packages:\n");
-
 	for (i = 0; i < prop_array_count(a); i++) {
-		obj = prop_array_get(a, i);
+		prop_array_get_cstring_nocopy(a, i, &str);
-		fprintf(stderr, "  * Missing binary package for: %s\n",
+		fprintf(stderr, "  * Missing binary package for: %s\n", str);
-		    prop_string_cstring_nocopy(obj));
+	}
+}
+
+static void
+show_conflicts(prop_array_t a)
+{
+	size_t i;
+	const char *str;
+
+	fprintf(stderr, "xbps-bin: conflicting packages were found:\n");
+	for (i = 0; i < prop_array_count(a); i++) {
+		prop_array_get_cstring_nocopy(a, i, &str);
+		fprintf(stderr, " %s\n", str);
 	}
 }
 
@@ -350,7 +360,7 @@ remove_pkg(const char *pkgname, bool recursive)
 int
 exec_transaction(bool yes, bool dry_run, bool show_download_urls)
 {
-	prop_array_t mdeps;
+	prop_array_t mdeps, cflicts;
 	struct transaction *trans;
 	struct xbps_handle *xhp = xbps_handle_get();
 	int rv = 0;
@@ -366,6 +376,11 @@ exec_transaction(bool yes, bool dry_run, bool show_download_urls)
 			/* missing packages */
 			show_missing_deps(mdeps);
 			goto out;
+		} else if (rv == EAGAIN) {
+			/* conflicts */
+			cflicts = prop_dictionary_get(xhp->transd, "conflicts");
+			show_conflicts(cflicts);
+			goto out;
 		}
 		xbps_dbg_printf("Empty transaction dictionary: %s\n",
 		    strerror(errno));

include/xbps_api.h

@@ -56,7 +56,7 @@
  */
 #define XBPS_PKGINDEX_VERSION	"1.5"
 
-#define XBPS_API_VERSION	"20120609"
+#define XBPS_API_VERSION	"20120611"
 #define XBPS_VERSION		"0.16"
 
 /**

include/xbps_api_impl.h

@@ -181,6 +181,12 @@ void HIDDEN xbps_set_cb_state(xbps_state_t, int, const char *,
  */
 int HIDDEN xbps_unpack_binary_pkg(prop_dictionary_t);
 
+/**
+ * @private
+ * From lib/package_conflicts.c
+ */
+void HIDDEN xbps_pkg_find_conflicts(struct xbps_handle *, prop_dictionary_t);
+
 __END_DECLS
 
 #endif /* !_XBPS_API_IMPL_H_ */

lib/Makefile

@@ -46,7 +46,7 @@ OBJS += package_remove.o package_remove_obsoletes.o package_state.o
 OBJS += package_unpack.o package_requiredby.o package_register.o
 OBJS += transaction_commit.o transaction_package_replace.o
 OBJS += transaction_dictionary.o transaction_sortdeps.o transaction_ops.o
-OBJS += download.o initend.o pkgdb.o
+OBJS += download.o initend.o pkgdb.o package_conflicts.o
 OBJS += plist.o plist_archive_entry.o plist_find.o plist_match.o
 OBJS += plist_remove.o plist_fetch.o util.o util_hash.o 
 OBJS += repository_finddeps.o cb_util.o

lib/package_conflicts.c

@@ -0,0 +1,82 @@
+/*-
+ * Copyright (c) 2012 Juan Romero Pardines.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stdio.h>
+#include <stdbool.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+
+#include "xbps_api_impl.h"
+
+void HIDDEN
+xbps_pkg_find_conflicts(struct xbps_handle *xhp, prop_dictionary_t pkg_repod)
+{
+	prop_array_t pkg_cflicts, trans_cflicts;
+	prop_dictionary_t pkgd;
+	const char *cfpkg, *repopkgver, *pkgver;
+	char *buf;
+	size_t i;
+
+	pkg_cflicts = prop_dictionary_get(pkg_repod, "conflicts");
+	if (pkg_cflicts == NULL || prop_array_count(pkg_cflicts) == 0)
+		return;
+
+	trans_cflicts = prop_dictionary_get(xhp->transd, "conflicts");
+	prop_dictionary_get_cstring_nocopy(pkg_repod, "pkgver", &repopkgver);
+
+	for (i = 0; i < prop_array_count(pkg_cflicts); i++) {
+		prop_array_get_cstring_nocopy(pkg_cflicts, i, &cfpkg);
+		/*
+		 * Check if current pkg conflicts with an installed package.
+		 */
+		if ((pkgd = xbps_pkgdb_get_pkgd(cfpkg, true))) {
+			prop_dictionary_get_cstring_nocopy(pkgd,
+			    "pkgver", &pkgver);
+			buf = xbps_xasprintf("%s conflicts with "
+			    "installed pkg %s", repopkgver, pkgver);
+			assert(buf != NULL);
+			prop_array_add_cstring(trans_cflicts, buf);
+			prop_object_release(pkgd);
+			free(buf);
+			continue;
+		}
+		/*
+		 * Check if current pkg conflicts with any pkg in transaction.
+		 */
+		pkgd = xbps_find_pkg_in_dict_by_pattern(xhp->transd,
+		    "unsorted_deps", cfpkg);
+		if (pkgd != NULL) {
+			prop_dictionary_get_cstring_nocopy(pkgd,
+			    "pkgver", &pkgver);
+			buf = xbps_xasprintf("%s conflicts with "
+			   "%s in transaction", repopkgver, pkgver);
+			assert(buf != NULL);
+			prop_array_add_cstring(trans_cflicts, buf);
+			free(buf);
+			continue;
+		}
+	}
+}

lib/repository_finddeps.c

@@ -359,6 +359,10 @@ find_repo_deps(prop_dictionary_t transd, 	/* transaction dictionary */
 				continue;
 			}
 		}
+		/*
+		 * Check if package has matched conflicts.
+		 */
+		xbps_pkg_find_conflicts(xhp, curpkgd);
 		/*
 		 * Package is on repo, add it into the transaction dictionary.
 		 */

lib/transaction_dictionary.c

@@ -190,7 +190,7 @@ out:
 int HIDDEN
 xbps_transaction_init(struct xbps_handle *xhp)
 {
-	prop_array_t unsorted, mdeps;
+	prop_array_t unsorted, mdeps, conflicts;
 
 	if (xhp->transd != NULL)
 		return 0;
@@ -218,6 +218,16 @@ xbps_transaction_init(struct xbps_handle *xhp)
 		xhp->transd = NULL;
 		return EINVAL;
 	}
+	if ((conflicts = prop_array_create()) == NULL) {
+		prop_object_release(xhp->transd);
+		xhp->transd = NULL;
+		return ENOMEM;
+	}
+	if (!xbps_add_obj_to_dict(xhp->transd, conflicts, "conflicts")) {
+		prop_object_release(xhp->transd);
+		xhp->transd = NULL;
+		return EINVAL;
+	}
 
 	return 0;
 }
@@ -225,7 +235,7 @@ xbps_transaction_init(struct xbps_handle *xhp)
 int
 xbps_transaction_prepare(void)
 {
-	prop_array_t mdeps;
+	prop_array_t mdeps, conflicts;
 	struct xbps_handle *xhp = xbps_handle_get();
 	int rv = 0;
 
@@ -239,6 +249,13 @@ xbps_transaction_prepare(void)
 	if (prop_array_count(mdeps) > 0)
 		return ENODEV;
 
+	/*
+	 * If there are package conflicts bail out.
+	 */
+	conflicts = prop_dictionary_get(xhp->transd, "conflicts");
+	if (prop_array_count(conflicts) > 0)
+		return EAGAIN;
+
 	/*
 	 * Check for packages to be replaced.
 	 */
@@ -266,9 +283,10 @@ xbps_transaction_prepare(void)
 		return rv;
 	}
 	/*
-	 * The missing deps array is not necessary anymore.
+	 * The missing deps and conflicts arrays are not necessary anymore.
 	 */
 	prop_dictionary_remove(xhp->transd, "missing_deps");
+	prop_dictionary_remove(xhp->transd, "conflicts");
 	prop_dictionary_make_immutable(xhp->transd);
 
 	return 0;

lib/transaction_ops.c

@@ -126,16 +126,22 @@ transaction_find_pkg(const char *pkg, bool bypattern, bool best, bool exact,
 		}
 	}
 	/*
-	 * Prepare transaction dictionary and missing deps array.
+	 * Prepare transaction dictionary.
 	 */
 	if ((rv = xbps_transaction_init(xhp)) != 0)
 		goto out;
+
+	/*
+	 * Find out if package has matched conflicts.
+	 */
+	xbps_pkg_find_conflicts(xhp, pkg_repod);
+
 	/*
 	 * Prepare required package dependencies and add them into the
 	 * "unsorted" array in transaction dictionary.
 	 */
 	if ((rv = xbps_repository_find_pkg_deps(xhp, pkg_repod)) != 0)
-			goto out;
+		goto out;
 	/*
 	 * Set package state in dictionary with same state than the
 	 * package currently uses, otherwise not-installed.