tar: optional support for --to-command

function                                             old     new   delta
data_extract_to_command                                -     430    +430
dec2env                                                -      44     +44
tar_main                                             778     819     +41
str2env                                                -      37     +37
tar_var                                                -      32     +32
xputenv                                                -      22     +22
tar_longopts                                         257     270     +13
------------------------------------------------------------------------------
(add/remove: 6/0 grow/shrink: 2/0 up/down: 619/0)             Total: 619 bytes

Signed-off-by: Ladislav Michl <Ladislav.Michl@seznam.cz>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 12 insertions, 0 deletions

diff --git a/archival/tar.c b/archival/tar.c
index 3a940128b..344c9dea4 100644
--- a/archival/tar.c
+++ b/archival/tar.c
@@ -750,6 +750,7 @@ enum {
         IF_FEATURE_SEAMLESS_Z(   OPTBIT_COMPRESS    ,) // 16th bit
         IF_FEATURE_TAR_NOPRESERVE_TIME(OPTBIT_NOPRESERVE_TIME,)
 #if ENABLE_FEATURE_TAR_LONG_OPTIONS
+        IF_FEATURE_TAR_TO_COMMAND(OPTBIT_2COMMAND   ,)
         OPTBIT_NUMERIC_OWNER,
         OPTBIT_NOPRESERVE_PERM,
         OPTBIT_OVERWRITE,
@@ -772,6 +773,7 @@ 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_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
         OPT_OVERWRITE       = IF_FEATURE_TAR_LONG_OPTIONS((1 << OPTBIT_OVERWRITE      )) + 0, // overwrite
@@ -813,6 +815,9 @@ static const char tar_longopts[] ALIGN1 =
 # if ENABLE_FEATURE_TAR_NOPRESERVE_TIME
         "touch\0"               No_argument       "m"
 # endif
+# if ENABLE_FEATURE_TAR_TO_COMMAND
+        "to-command\0"          Required_argument "\xfb"
+# endif
         /* use numeric uid/gid from tar header, not textual */
         "numeric-owner\0"       No_argument       "\xfc"
         /* do not restore mode */
@@ -904,6 +909,7 @@ int tar_main(int argc UNUSED_PARAM, char **argv)
                 , &tar_filename // -f filename
                 IF_FEATURE_TAR_FROM(, &(tar_handle->accept)) // T
                 IF_FEATURE_TAR_FROM(, &(tar_handle->reject)) // X
+                IF_FEATURE_TAR_TO_COMMAND(, &(tar_handle->tar__to_command)) // --to-command
 #if ENABLE_FEATURE_TAR_LONG_OPTIONS && ENABLE_FEATURE_TAR_FROM
                 , &excludes // --exclude
 #endif
@@ -922,6 +928,12 @@ int tar_main(int argc UNUSED_PARAM, char **argv)
         if (opt & OPT_2STDOUT)
                 tar_handle->action_data = data_extract_to_stdout;
 
+        if (opt & OPT_2COMMAND) {
+                putenv((char*)"TAR_FILETYPE=f");
+                signal(SIGPIPE, SIG_IGN);
+                tar_handle->action_data = data_extract_to_command;
+        }
+
         if (opt & OPT_KEEP_OLD)
                 tar_handle->ah_flags &= ~ARCHIVE_UNLINK_OLD;