Report local file URL for -Sp operations if package is in cache

When using "pacman -Sp" operation to get URLs of packages to download, it is
useful to know which packages are already in the file cache and do not need
downloaded.  Print packages in the cache with a file:// prefix.

e.g
$ pacman -Sp glibc
file:///var/cache/pacman/glibc-2.23-1-x86_64.pkg.tar.xz

Also use package locations in case statements rather than opersations. This
allows the ALPM_PKG_SYNCDB to fall thorough to just printing the package name
for weird serverless repo setups.

Fixes FS#15868

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

1 files changed, 24 insertions, 3 deletions

diff --git a/src/pacman/util.c b/src/pacman/util.c
index 0155493f..81780f7c 100644
--- a/src/pacman/util.c
+++ b/src/pacman/util.c
@@ -1025,16 +1025,37 @@ static char *pkg_get_location(alpm_pkg_t *pkg)
 {
 	alpm_list_t *servers;
 	char *string = NULL;
-	switch(config->op) {
-		case PM_OP_SYNC:
+	switch(alpm_pkg_get_origin(pkg)) {
+		case ALPM_PKG_FROM_SYNCDB:
+			if(alpm_pkg_download_size(pkg) == 0) {
+				/* file is already in the package cache */
+				alpm_list_t *i;
+				const char *pkgfile = alpm_pkg_get_filename(pkg);
+				char path[PATH_MAX];
+				struct stat buf;
+
+				for(i = alpm_option_get_cachedirs(config->handle); i; i = i->next) {
+					snprintf(path, PATH_MAX, "%s%s", (char *)i->data, pkgfile);
+					if(stat(path, &buf) == 0 && S_ISREG(buf.st_mode)) {
+						pm_asprintf(&string, "file://%s", path);
+						return string;
+					}
+				}
+			}
+
 			servers = alpm_db_get_servers(alpm_pkg_get_db(pkg));
 			if(servers) {
 				pm_asprintf(&string, "%s/%s", (char *)(servers->data),
 						alpm_pkg_get_filename(pkg));
 				return string;
 			}
-		case PM_OP_UPGRADE:
+
+			/* fallthrough - for theoretical serverless repos */
+
+		case ALPM_PKG_FROM_FILE:
 			return strdup(alpm_pkg_get_filename(pkg));
+
+		case ALPM_PKG_FROM_LOCALDB:
 		default:
 			pm_asprintf(&string, "%s-%s", alpm_pkg_get_name(pkg), alpm_pkg_get_version(pkg));
 			return string;