opkg: Ensure we use the uname/gname fields when extracting tarballs

When extracting packages onto the target system in particular, we
really want to ensure the name fields in the tarball are used over
and above the numerical uid/gid values. This patch adds this
functionality to opkg and ensures package upgrades work correctly
permission wise.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

2 files changed, 90 insertions, 1 deletions

diff --git a/meta/recipes-devtools/opkg/opkg/add_uname_support.patch b/meta/recipes-devtools/opkg/opkg/add_uname_support.patch
new file mode 100644
index 000000000..0f627f117
--- /dev/null
+++ b/meta/recipes-devtools/opkg/opkg/add_uname_support.patch
@@ -0,0 +1,88 @@
+
+When updating packages on the target device we ideally want to match 
+user and group numbers from the existing file system. This patch encourages
+opkg to lookup the uname/gname fields first and only use the hardcoded
+numerical values if that fails.
+
+Upstream-Status: Pending
+
+RP 11/11/11
+
+Index: trunk/libbb/unarchive.c
+===================================================================
+--- trunk.orig/libbb/unarchive.c	2011-11-11 15:52:59.761674091 +0000
++++ trunk/libbb/unarchive.c	2011-11-11 17:04:56.501574419 +0000
+@@ -22,10 +22,13 @@
+ #include <stdio.h>
+ #include <errno.h>
+ #include <stdlib.h>
++#include <stdbool.h>
+ #include <string.h>
+ #include <unistd.h>
+ #include <utime.h>
+ #include <libgen.h>
++#include <grp.h>
++#include <pwd.h>
+ 
+ #include "libbb.h"
+ 
+@@ -436,6 +439,42 @@
+ 	free(ar_entry);
+ }
+ 
++static char uname_cache[32] = "";
++static uid_t uid_cache;
++
++static bool update_unamecache(char *uname) {
++	struct passwd *passwd;
++	if (!uname)
++		return FALSE;
++	if (!uname_cache[0] && strcmp(uname_cache, uname) == 0)
++		return TRUE;
++	passwd = getpwnam(uname);
++	if (passwd) {
++		uid_cache = passwd->pw_uid;
++		strncpy(uname, uname_cache, 32);
++		return TRUE;
++	}
++	return FALSE;
++}
++
++static char gname_cache[32] = "";
++static gid_t gid_cache;
++
++static bool update_gnamecache(char *gname) {
++	struct group *group;
++	if (!gname)
++		return FALSE;
++	if (!gname_cache[0] && strcmp(gname_cache, gname) == 0)
++		return TRUE;
++	group = getgrnam(gname);
++	if (group) {
++		gid_cache = group->gr_gid;
++		strncpy(gname, gname_cache, 32);
++		return TRUE;
++	}
++	return FALSE;
++}
++
+ 
+ static file_header_t *
+ get_header_tar(FILE *tar_stream)
+@@ -515,8 +554,14 @@
+ */
+         tar_entry->mode = 07777 & strtol(tar.formated.mode, NULL, 8);
+ 
+-	tar_entry->uid   = strtol(tar.formated.uid, NULL, 8);
+-	tar_entry->gid   = strtol(tar.formated.gid, NULL, 8);
++	if (update_unamecache(tar.formated.uname))
++		tar_entry->uid = uid_cache;
++	else
++		tar_entry->uid = strtol(tar.formated.uid, NULL, 8);
++	if (update_gnamecache(tar.formated.gname))
++		tar_entry->gid = gid_cache;
++	else
++		tar_entry->gid = strtol(tar.formated.gid, NULL, 8);
+ 	tar_entry->size  = strtol(tar.formated.size, NULL, 8);
+ 	tar_entry->mtime = strtol(tar.formated.mtime, NULL, 8);
+ 
diff --git a/meta/recipes-devtools/opkg/opkg_svn.bb b/meta/recipes-devtools/opkg/opkg_svn.bb
index 099a373f3..8f50f677b 100644
--- a/meta/recipes-devtools/opkg/opkg_svn.bb
+++ b/meta/recipes-devtools/opkg/opkg_svn.bb
@@ -11,13 +11,14 @@ RREPLACES_${PN} = "opkg-nogpg"
 
 SRC_URI = "svn://opkg.googlecode.com/svn;module=trunk;proto=http \
            file://add_vercmp.patch \
+           file://add_uname_support.patch \
 "
 
 S = "${WORKDIR}/trunk"
 
 SRCREV = "625"
 PV = "0.1.8+svnr${SRCPV}"
-PR = "r2"
+PR = "r3"
 
 PACKAGES =+ "libopkg${PKGSUFFIX}-dev libopkg${PKGSUFFIX} update-alternatives-cworth${PKGSUFFIX}"