[BusyBox] new tar feature

[Rainer Weikusat]

If GNU tar is asked to work with a set of archive members, it will
report the names of all of them that are missing on stderr, followed
by a line that says "Error exit delayed from previous errors". The
patch below adds a compile-time option (default: off) to make the
busybox tar act likewise.

Index: busybox/archival/Config.in
===================================================================
RCS file: /data/repo/busybox/archival/Config.in,v
retrieving revision 1.1.1.1
retrieving revision 1.2
diff -u -r1.1.1.1 -r1.2
--- busybox/archival/Config.in	30 Nov 2004 16:02:30 -0000	1.1.1.1
+++ busybox/archival/Config.in	21 Aug 2005 19:11:08 -0000	1.2
@@ -205,6 +205,14 @@
 	help
 		Enable use of long options, increases size by about 400 Bytes
 
+config CONFIG_FEATURE_TAR_ALL_MISSING
+	bool "  Report all specified files that were not part of the Archive."
+	default n
+	depends on CONFIG_TAR
+	help
+          Print the names of all archive members tar was asked to operate on
+	  but couldn't, because they were not part of the archive to process.
+
 config CONFIG_UNCOMPRESS
 	bool "uncompress"
 	default n
Index: busybox/archival/tar.c
===================================================================
RCS file: /data/repo/busybox/archival/tar.c,v
retrieving revision 1.1.1.2
retrieving revision 1.2
diff -u -r1.1.1.2 -r1.2
--- busybox/archival/tar.c	1 Jun 2005 08:04:03 -0000	1.1.1.2
+++ busybox/archival/tar.c	21 Aug 2005 19:10:59 -0000	1.2
@@ -611,6 +611,7 @@
 # define TAR_OPT_FLAG_CREATE	0
 #endif
 
+
 #ifdef CONFIG_FEATURE_TAR_BZIP2
 # define TAR_OPT_BZIP2	(1 << (8 + TAR_OPT_FLAG_CREATE))
 # define TAR_OPT_STR_BZIP2	"j"
@@ -623,6 +624,7 @@
 #ifdef CONFIG_FEATURE_TAR_FROM
 # define TAR_OPT_INCLUDE_FROM	(1 << (8 + TAR_OPT_FLAG_CREATE + TAR_OPT_FLAG_BZIP2))
 # define TAR_OPT_EXCLUDE_FROM	(1 << (8 + TAR_OPT_FLAG_CREATE + TAR_OPT_FLAG_BZIP2 + 1))
+# define TAR_OPT_IGNORE_MISSING	(1 << (8 + TAR_OPT_FLAG_CREATE + TAR_OPT_FLAG_BZIP2 + 2))
 # define TAR_OPT_STR_FROM	"T:X:"
 # define TAR_OPT_FLAG_FROM	2
 #else
@@ -644,6 +646,13 @@
 # define TAR_OPT_STR_COMPRESS	"Z"
 #else
 # define TAR_OPT_STR_COMPRESS	""
+# define TAR_OPT_FLAG_COMPRESS	0
+#endif
+
+#ifdef CONFIG_FEATURE_TAR_ALL_MISSING
+# define signal_error bb_error_msg
+#else
+# define signal_error bb_error_msg_and_die
 #endif
 
 static const char tar_options[]="txC:f:Opvk" \
@@ -663,6 +672,7 @@
 	{ "same-permissions",	0,	NULL,	'p' },
 	{ "verbose",		0,	NULL,	'v' },
 	{ "keep-old",		0,	NULL,	'k' },
+	{ "all-missing",	0,	0,	'a' },
 # ifdef CONFIG_FEATURE_TAR_CREATE
 	{ "create",			0,	NULL,	'c' },
 	{ "dereference",	0,	NULL,	'h' },
@@ -692,6 +702,7 @@
 	const char *tar_filename = "-";
 	unsigned long opt;
 	unsigned long ctx_flag = 0;
+	int rc;
 
 	if (argc < 2) {
 		bb_show_usage();
@@ -842,6 +853,8 @@
 		bb_perror_msg_and_die("Couldnt chdir to %s", base_dir);
 	}
 
+	rc = EXIT_SUCCESS;
+
 #ifdef CONFIG_FEATURE_TAR_CREATE
 	/* create an archive */
 	if (opt & CTX_CREATE) {
@@ -874,11 +887,16 @@
 		while (tar_handle->accept) {
 			if (find_list_entry(tar_handle->reject, tar_handle->accept->data) == NULL) {
 				if (find_list_entry(tar_handle->passed, tar_handle->accept->data) == NULL) {
-					bb_error_msg_and_die("%s: Not found in archive\n", tar_handle->accept->data);
+					signal_error("%s: Not found in archive", tar_handle->accept->data);
+					rc = EXIT_FAILURE;
 				}
 			}
 			tar_handle->accept = tar_handle->accept->link;
 		}
+
+#ifdef CONFIG_FEATURE_TAR_ALL_MISSING
+		if (rc != EXIT_SUCCESS) bb_error_msg("Error exit delayed from previous errors");
+#endif						
 	}
 
 #ifdef CONFIG_FEATURE_CLEAN_UP
@@ -887,5 +905,5 @@
 	}
 #endif /* CONFIG_FEATURE_CLEAN_UP */
 
-	return(EXIT_SUCCESS);
+	return rc;
 }