tar: implement --no-recursion

function                                             old     new   delta
tar_longopts                                         259     274     +15
.rodata                                             5757    5772     +15
tar_main                                            1038    1052     +14
writeTarFile                                         362     353      -9
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 3/1 up/down: 44/-9)              Total: 35 bytes
   text	   data	    bss	    dec	    hex	filename
  81457	   1706	   8344	  91507	  16573	busybox_old
  81477	   1706	   8344	  91527	  16587	busybox_unstripped

Signed-off-by: Natanael Copa <natanael.copa@gmail.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 12 insertions, 7 deletions

diff --git a/archival/tar.c b/archival/tar.c
index cf972c24c..a64d6510f 100644
--- a/archival/tar.c
+++ b/archival/tar.c
@@ -60,8 +60,8 @@
 
 #if !ENABLE_FEATURE_SEAMLESS_GZ && !ENABLE_FEATURE_SEAMLESS_BZ2
 /* Do not pass gzip flag to writeTarFile() */
-#define writeTarFile(tar_fd, verboseFlag, dereferenceFlag, include, exclude, gzip) \
-        writeTarFile(tar_fd, verboseFlag, dereferenceFlag, include, exclude)
+#define writeTarFile(tar_fd, verboseFlag, recurseFlags, include, exclude, gzip) \
+        writeTarFile(tar_fd, verboseFlag, recurseFlags, include, exclude)
 #endif
 
 
@@ -598,7 +598,7 @@ static void NOINLINE vfork_compressor(int tar_fd, int gzip)
 
 /* gcc 4.2.1 inlines it, making code bigger */
 static NOINLINE int writeTarFile(int tar_fd, int verboseFlag,
-        int dereferenceFlag, const llist_t *include,
+        int recurseFlags, const llist_t *include,
         const llist_t *exclude, int gzip)
 {
         int errorFlag = FALSE;
@@ -621,8 +621,7 @@ static NOINLINE int writeTarFile(int tar_fd, int verboseFlag,
 
         /* Read the directory/files and iterate over them one at a time */
         while (include) {
-                if (!recursive_action(include->data, ACTION_RECURSE |
-                                (dereferenceFlag ? ACTION_FOLLOWLINKS : 0),
+                if (!recursive_action(include->data, recurseFlags,
                                 writeFileToTarball, writeFileToTarball, &tbInfo, 0)
                 ) {
                         errorFlag = TRUE;
@@ -662,7 +661,7 @@ static NOINLINE int writeTarFile(int tar_fd, int verboseFlag,
 }
 #else
 int writeTarFile(int tar_fd, int verboseFlag,
-        int dereferenceFlag, const llist_t *include,
+        int recurseFlags, const llist_t *include,
         const llist_t *exclude, int gzip);
 #endif /* FEATURE_TAR_CREATE */
 
@@ -749,6 +748,7 @@ static llist_t *append_file_list_to_list(llist_t *list)
 //      o       no-same-owner
 //      p       same-permissions
 //      k       keep-old
+//      no-recursion
 //      numeric-owner
 //      no-same-permissions
 //      overwrite
@@ -768,6 +768,7 @@ enum {
         IF_FEATURE_SEAMLESS_Z(   OPTBIT_COMPRESS    ,) // 16th bit
         IF_FEATURE_TAR_NOPRESERVE_TIME(OPTBIT_NOPRESERVE_TIME,)
 #if ENABLE_FEATURE_TAR_LONG_OPTIONS
+        OPTBIT_NORECURSION,
         IF_FEATURE_TAR_TO_COMMAND(OPTBIT_2COMMAND   ,)
         OPTBIT_NUMERIC_OWNER,
         OPTBIT_NOPRESERVE_PERM,
@@ -791,6 +792,7 @@ enum {
         OPT_GZIP         = IF_FEATURE_SEAMLESS_GZ(  (1 << OPTBIT_GZIP        )) + 0, // z
         OPT_COMPRESS     = IF_FEATURE_SEAMLESS_Z(   (1 << OPTBIT_COMPRESS    )) + 0, // Z
         OPT_NOPRESERVE_TIME = IF_FEATURE_TAR_NOPRESERVE_TIME((1 << OPTBIT_NOPRESERVE_TIME)) + 0, // m
+        OPT_NORECURSION     = IF_FEATURE_TAR_LONG_OPTIONS((1 << OPTBIT_NORECURSION    )) + 0, // no-recursion
         OPT_2COMMAND        = IF_FEATURE_TAR_TO_COMMAND(  (1 << OPTBIT_2COMMAND       )) + 0, // to-command
         OPT_NUMERIC_OWNER   = IF_FEATURE_TAR_LONG_OPTIONS((1 << OPTBIT_NUMERIC_OWNER  )) + 0, // numeric-owner
         OPT_NOPRESERVE_PERM = IF_FEATURE_TAR_LONG_OPTIONS((1 << OPTBIT_NOPRESERVE_PERM)) + 0, // no-same-permissions
@@ -835,6 +837,7 @@ static const char tar_longopts[] ALIGN1 =
 # if ENABLE_FEATURE_TAR_NOPRESERVE_TIME
         "touch\0"               No_argument       "m"
 # endif
+        "no-recursion\0"        No_argument       "\xfa"
 # if ENABLE_FEATURE_TAR_TO_COMMAND
         "to-command\0"          Required_argument "\xfb"
 # endif
@@ -1050,7 +1053,9 @@ int tar_main(int argc UNUSED_PARAM, char **argv)
                         zipMode = 2;
 #endif
                 /* NB: writeTarFile() closes tar_handle->src_fd */
-                return writeTarFile(tar_handle->src_fd, verboseFlag, opt & OPT_DEREFERENCE,
+                return writeTarFile(tar_handle->src_fd, verboseFlag,
+                                (opt & OPT_DEREFERENCE ? ACTION_FOLLOWLINKS : 0)
+                                | (opt & OPT_NORECURSION ? 0 : ACTION_RECURSE),
                                 tar_handle->accept,
                                 tar_handle->reject, zipMode);
         }