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tar: change -a from meaning "lzma" to mean "autodetect by extension"

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function                                             old     new   delta
tar_main                                            1026    1100     +74
packed_usage                                       33311   33329     +18
tar_longopts                                         309     325     +16
vfork_compressor                                     246     210     -36
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 3/1 up/down: 108/-36)            Total: 72 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2019-08-02 15:19:56 +02:00
parent e6a87e7483
commit 16474cf246
1 changed files with 42 additions and 18 deletions
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60
archival/tar.c
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@ -637,8 +637,14 @@ static void NOINLINE vfork_compressor(int tar_fd, const char *gzip)
}
xmove_fd(data.rd, 0);
xmove_fd(tfd, 1);
/* exec gzip/bzip2 program/applet */
BB_EXECLP(gzip, gzip, "-f", (char *)0);
/* exec gzip/bzip2/... program */
//BB_EXECLP(gzip, gzip, "-f", (char *)0); - WRONG for "xz",
// if xz is an enabled applet, it'll be a version which
// can only decompress. We do need to execute external
// program, not applet.
execlp(gzip, gzip, "-f", (char *)0);
vfork_exec_errno = errno;
_exit(EXIT_FAILURE);
}
@ -762,7 +768,7 @@ static llist_t *append_file_list_to_list(llist_t *list)
//usage: IF_FEATURE_SEAMLESS_GZ("z")
//usage: IF_FEATURE_SEAMLESS_XZ("J")
//usage: IF_FEATURE_SEAMLESS_BZ2("j")
//usage: IF_FEATURE_SEAMLESS_LZMA("a")
//usage: "a"
//usage: IF_FEATURE_TAR_CREATE("h")
//usage: IF_FEATURE_TAR_NOPRESERVE_TIME("m")
//usage: "vokO] "
@ -801,9 +807,7 @@ static llist_t *append_file_list_to_list(llist_t *list)
//usage: IF_FEATURE_SEAMLESS_BZ2(
//usage: "\n -j (De)compress using bzip2"
//usage: )
//usage: IF_FEATURE_SEAMLESS_LZMA(
//usage: "\n -a (De)compress using lzma"
//usage: )
//usage: "\n -a (De)compress based on extension"
//usage: IF_FEATURE_TAR_CREATE(
//usage: "\n -h Follow symlinks"
//usage: )
@ -820,6 +824,7 @@ static llist_t *append_file_list_to_list(llist_t *list)
//usage: "$ tar -cf /tmp/tarball.tar /usr/local\n"
// Supported but aren't in --help:
// lzma
// no-recursion
// numeric-owner
// no-same-permissions
@ -833,15 +838,16 @@ enum {
IF_FEATURE_TAR_CREATE( OPTBIT_CREATE ,)
IF_FEATURE_TAR_CREATE( OPTBIT_DEREFERENCE ,)
IF_FEATURE_SEAMLESS_BZ2( OPTBIT_BZIP2 ,)
IF_FEATURE_SEAMLESS_LZMA(OPTBIT_LZMA ,)
IF_FEATURE_TAR_FROM( OPTBIT_INCLUDE_FROM,)
IF_FEATURE_TAR_FROM( OPTBIT_EXCLUDE_FROM,)
IF_FEATURE_SEAMLESS_GZ( OPTBIT_GZIP ,)
IF_FEATURE_SEAMLESS_XZ( OPTBIT_XZ ,) // 16th bit
IF_FEATURE_SEAMLESS_Z( OPTBIT_COMPRESS ,)
IF_FEATURE_SEAMLESS_XZ( OPTBIT_XZ ,)
IF_FEATURE_SEAMLESS_Z( OPTBIT_COMPRESS ,) // 16th bit
OPTBIT_AUTOCOMPRESS_BY_EXT,
IF_FEATURE_TAR_NOPRESERVE_TIME(OPTBIT_NOPRESERVE_TIME,)
#if ENABLE_FEATURE_TAR_LONG_OPTIONS
OPTBIT_STRIP_COMPONENTS,
IF_FEATURE_SEAMLESS_LZMA(OPTBIT_LZMA ,)
OPTBIT_NORECURSION,
IF_FEATURE_TAR_TO_COMMAND(OPTBIT_2COMMAND ,)
OPTBIT_NUMERIC_OWNER,
@ -860,14 +866,15 @@ enum {
OPT_CREATE = IF_FEATURE_TAR_CREATE( (1 << OPTBIT_CREATE )) + 0, // c
OPT_DEREFERENCE = IF_FEATURE_TAR_CREATE( (1 << OPTBIT_DEREFERENCE )) + 0, // h
OPT_BZIP2 = IF_FEATURE_SEAMLESS_BZ2( (1 << OPTBIT_BZIP2 )) + 0, // j
OPT_LZMA = IF_FEATURE_SEAMLESS_LZMA((1 << OPTBIT_LZMA )) + 0, // a
OPT_INCLUDE_FROM = IF_FEATURE_TAR_FROM( (1 << OPTBIT_INCLUDE_FROM)) + 0, // T
OPT_EXCLUDE_FROM = IF_FEATURE_TAR_FROM( (1 << OPTBIT_EXCLUDE_FROM)) + 0, // X
OPT_GZIP = IF_FEATURE_SEAMLESS_GZ( (1 << OPTBIT_GZIP )) + 0, // z
OPT_XZ = IF_FEATURE_SEAMLESS_XZ( (1 << OPTBIT_XZ )) + 0, // J
OPT_COMPRESS = IF_FEATURE_SEAMLESS_Z( (1 << OPTBIT_COMPRESS )) + 0, // Z
OPT_AUTOCOMPRESS_BY_EXT = 1 << OPTBIT_AUTOCOMPRESS_BY_EXT, // a
OPT_NOPRESERVE_TIME = IF_FEATURE_TAR_NOPRESERVE_TIME((1 << OPTBIT_NOPRESERVE_TIME)) + 0, // m
OPT_STRIP_COMPONENTS = IF_FEATURE_TAR_LONG_OPTIONS((1 << OPTBIT_STRIP_COMPONENTS)) + 0, // strip-components
OPT_LZMA = IF_FEATURE_TAR_LONG_OPTIONS(IF_FEATURE_SEAMLESS_LZMA((1 << OPTBIT_LZMA))) + 0, // lzma
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
@ -897,9 +904,6 @@ static const char tar_longopts[] ALIGN1 =
# if ENABLE_FEATURE_SEAMLESS_BZ2
"bzip2\0" No_argument "j"
# endif
# if ENABLE_FEATURE_SEAMLESS_LZMA
"lzma\0" No_argument "a"
# endif
# if ENABLE_FEATURE_TAR_FROM
"files-from\0" Required_argument "T"
"exclude-from\0" Required_argument "X"
@ -913,10 +917,14 @@ static const char tar_longopts[] ALIGN1 =
# if ENABLE_FEATURE_SEAMLESS_Z
"compress\0" No_argument "Z"
# endif
"auto-compress\0" No_argument "a"
# if ENABLE_FEATURE_TAR_NOPRESERVE_TIME
"touch\0" No_argument "m"
# endif
"strip-components\0" Required_argument "\xf9"
"strip-components\0" Required_argument "\xf8"
# if ENABLE_FEATURE_SEAMLESS_LZMA
"lzma\0" No_argument "\xf9"
# endif
"no-recursion\0" No_argument "\xfa"
# if ENABLE_FEATURE_TAR_TO_COMMAND
"to-command\0" Required_argument "\xfb"
@ -1005,13 +1013,13 @@ int tar_main(int argc UNUSED_PARAM, char **argv)
"txC:f:Oopvk"
IF_FEATURE_TAR_CREATE( "ch" )
IF_FEATURE_SEAMLESS_BZ2( "j" )
IF_FEATURE_SEAMLESS_LZMA("a" )
IF_FEATURE_TAR_FROM( "T:*X:*")
IF_FEATURE_SEAMLESS_GZ( "z" )
IF_FEATURE_SEAMLESS_XZ( "J" )
IF_FEATURE_SEAMLESS_Z( "Z" )
"a"
IF_FEATURE_TAR_NOPRESERVE_TIME("m")
IF_FEATURE_TAR_LONG_OPTIONS("\xf9:") // --strip-components
IF_FEATURE_TAR_LONG_OPTIONS("\xf8:") // --strip-components
"\0"
"tt:vv:" // count -t,-v
#if ENABLE_FEATURE_TAR_LONG_OPTIONS && ENABLE_FEATURE_TAR_FROM
@ -1040,7 +1048,7 @@ int tar_main(int argc UNUSED_PARAM, char **argv)
);
#if DBG_OPTION_PARSING
bb_error_msg("opt: 0x%08x", opt);
# define showopt(o) bb_error_msg("opt & %s(%x): %x", #o, o, opt & o);
# define showopt(o) bb_error_msg("opt & %s(%x):\t%x", #o, o, opt & o);
showopt(OPT_TEST );
showopt(OPT_EXTRACT );
showopt(OPT_BASEDIR );
@ -1053,14 +1061,15 @@ int tar_main(int argc UNUSED_PARAM, char **argv)
showopt(OPT_CREATE );
showopt(OPT_DEREFERENCE );
showopt(OPT_BZIP2 );
showopt(OPT_LZMA );
showopt(OPT_INCLUDE_FROM );
showopt(OPT_EXCLUDE_FROM );
showopt(OPT_GZIP );
showopt(OPT_XZ );
showopt(OPT_COMPRESS );
showopt(OPT_AUTOCOMPRESS_BY_EXT);
showopt(OPT_NOPRESERVE_TIME );
showopt(OPT_STRIP_COMPONENTS);
showopt(OPT_LZMA );
showopt(OPT_NORECURSION );
showopt(OPT_2COMMAND );
showopt(OPT_NUMERIC_OWNER );
@ -1179,6 +1188,21 @@ int tar_main(int argc UNUSED_PARAM, char **argv)
bb_perror_msg_and_die("can't open '%s'", tar_filename);
} else {
tar_handle->src_fd = xopen(tar_filename, flags);
#if ENABLE_FEATURE_TAR_CREATE
if ((OPT_GZIP | OPT_BZIP2 | OPT_XZ | OPT_LZMA) != 0 /* at least one is config-enabled */
&& (opt & OPT_AUTOCOMPRESS_BY_EXT)
&& flags != O_RDONLY
) {
if (OPT_GZIP != 0 && is_suffixed_with(tar_filename, "gz"))
opt |= OPT_GZIP;
if (OPT_BZIP2 != 0 && is_suffixed_with(tar_filename, "bz2"))
opt |= OPT_BZIP2;
if (OPT_XZ != 0 && is_suffixed_with(tar_filename, "xz"))
opt |= OPT_XZ;
if (OPT_LZMA != 0 && is_suffixed_with(tar_filename, "lzma"))
opt |= OPT_LZMA;
}
#endif
}
}