Use archive_entry_set_perm instead of archive_entry_set_mode

This patch fixes FS#12148 ('unstable' regular file).
I also changed the other archive_entry_set_mode usage in add.c to
archive_entry_set_perm.

Since I cannot find any relevant info in libarchive manual, I quote
Tim Kientzle (the author of libarchive) here, and I say thank you for
his help.

*** Tim Kientzle wrote *************************************

This is the problem in libalpm/util.c:

323    if(S_ISREG(st->st_mode)) {
324            archive_entry_set_mode(entry, 0644);
325    } else if(S_ISDIR(st->st_mode)) {
326            archive_entry_set_mode(entry, 0755);
327    }

Your example unstable.db.tar.gz is not empty.  It has
one entry in it, called "./".  That entry is marked
as a directory.  But, when you call archive_entry_set_mode(),
you are changing the file type!  archive_read_extract()
then creates the file /var/unstable as you requested.
(archive_read_extract() will replace an empty directory
with a file.)

You should either set the mode value correctly:

323    if(S_ISREG(st->st_mode)) {
324            archive_entry_set_mode(entry, IFREG | 0644);
325    } else if(S_ISDIR(st->st_mode)) {
326            archive_entry_set_mode(entry, IFDIR | 0755);
327    }

Or use archive_entry_set_perm(), which does not change
the file type:

323    if(S_ISREG(st->st_mode)) {
324            archive_entry_set_perm(entry, 0644);
325    } else if(S_ISDIR(st->st_mode)) {
326            archive_entry_set_perm(entry, 0755);
327    }

************************************************************

Signed-off-by: Nagy Gabor <ngaba@bibl.u-szeged.hu>
Signed-off-by: Dan McGee <dan@archlinux.org>

2 files changed, 4 insertions, 4 deletions

diff --git a/lib/libalpm/add.c b/lib/libalpm/add.c
index 1e8ec9f2..838f5a6d 100644
--- a/lib/libalpm/add.c
+++ b/lib/libalpm/add.c
@@ -292,12 +292,12 @@ static int extract_single_file(struct archive *archive,
 		/* the install script goes inside the db */
 		snprintf(filename, PATH_MAX, "%s%s-%s/install", db->path,
 				newpkg->name, newpkg->version);
-		archive_entry_set_mode(entry, 0644);
+		archive_entry_set_perm(entry, 0644);
 	} else if(strcmp(entryname, ".CHANGELOG") == 0) {
 		/* the changelog goes inside the db */
 		snprintf(filename, PATH_MAX, "%s%s-%s/changelog", db->path,
 				newpkg->name, newpkg->version);
-		archive_entry_set_mode(entry, 0644);
+		archive_entry_set_perm(entry, 0644);
 	} else if(*entryname == '.') {
 		/* for now, ignore all files starting with '.' that haven't
 		 * already been handled (for future possibilities) */
diff --git a/lib/libalpm/util.c b/lib/libalpm/util.c
index da3463b0..be465afa 100644
--- a/lib/libalpm/util.c
+++ b/lib/libalpm/util.c
@@ -310,9 +310,9 @@ int _alpm_unpack(const char *archive, const char *prefix, const char *fn)
 		entryname = archive_entry_pathname(entry);
 		
 		if(S_ISREG(st->st_mode)) {
-			archive_entry_set_mode(entry, 0644);
+			archive_entry_set_perm(entry, 0644);
 		} else if(S_ISDIR(st->st_mode)) {
-			archive_entry_set_mode(entry, 0755);
+			archive_entry_set_perm(entry, 0755);
 		}
 
 		/* If a specific file was requested skip entries that don't match. */