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cpio: add support for --ignore-devno like GNU cpio

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The --ignore-devno option is used to set device numbers to (0, 0).
This can be useful in verifying whether a CPIO archive is reproducible.

function                                             old     new   delta
cpio_o                                               922     961     +39
.rodata                                            78407   78422     +15
bbconfig_config_bz2                                 6161    6167      +6
packed_usage                                       25770   25764      -6
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 3/1 up/down: 60/-6)              Total: 54 bytes

Signed-off-by: Ariadne Conill <ariadne@dereferenced.org>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Ariadne Conill 2021-06-28 08:25:59 -06:00 committed by Denys Vlasenko
parent aaf3d5ba74
commit 8aa5585ff4
1 changed files with 20 additions and 0 deletions
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20
archival/cpio.c
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@ -38,6 +38,13 @@
//config: depends on FEATURE_CPIO_O
//config: help
//config: Passthrough mode. Rarely used.
//config:
//config:config FEATURE_CPIO_IGNORE_DEVNO
//config: bool "Support --ignore-devno like GNU cpio"
//config: default y
//config: depends on FEATURE_CPIO_O && LONG_OPTS
//config: help
//config: Optionally ignore device numbers when creating archives.
//applet:IF_CPIO(APPLET(cpio, BB_DIR_BIN, BB_SUID_DROP))
@ -75,6 +82,9 @@
//usage: "\n -R USER[:GRP] Set owner of created files"
//usage: "\n -L Dereference symlinks"
//usage: "\n -0 NUL terminated input"
//usage: IF_FEATURE_CPIO_IGNORE_DEVNO(
//usage: "\n --ignore-devno"
//usage: )
/* GNU cpio 2.9 --help (abridged):
@ -162,11 +172,13 @@ enum {
IF_FEATURE_CPIO_P(OPTBIT_PASSTHROUGH,)
IF_LONG_OPTS( OPTBIT_QUIET ,)
IF_LONG_OPTS( OPTBIT_2STDOUT ,)
IF_FEATURE_CPIO_IGNORE_DEVNO(OPTBIT_IGNORE_DEVNO,)
OPT_CREATE = IF_FEATURE_CPIO_O((1 << OPTBIT_CREATE )) + 0,
OPT_FORMAT = IF_FEATURE_CPIO_O((1 << OPTBIT_FORMAT )) + 0,
OPT_PASSTHROUGH = IF_FEATURE_CPIO_P((1 << OPTBIT_PASSTHROUGH)) + 0,
OPT_QUIET = IF_LONG_OPTS( (1 << OPTBIT_QUIET )) + 0,
OPT_2STDOUT = IF_LONG_OPTS( (1 << OPTBIT_2STDOUT )) + 0,
OPT_IGNORE_DEVNO = IF_FEATURE_CPIO_IGNORE_DEVNO((1 << OPTBIT_IGNORE_DEVNO)) + 0,
};
#define OPTION_STR "it0uvdmLF:R:"
@ -304,6 +316,11 @@ static NOINLINE int cpio_o(void)
}
}
#if ENABLE_FEATURE_CPIO_IGNORE_DEVNO
if (option_mask32 & OPT_IGNORE_DEVNO)
st.st_dev = st.st_rdev = 0;
#endif
bytes += printf("070701"
"%08X%08X%08X%08X%08X%08X%08X"
"%08X%08X%08X%08X" /* GNU cpio uses uppercase hex */
@ -379,6 +396,9 @@ int cpio_main(int argc UNUSED_PARAM, char **argv)
"null\0" No_argument "0"
"quiet\0" No_argument "\xff"
"to-stdout\0" No_argument "\xfe"
#if ENABLE_FEATURE_CPIO_IGNORE_DEVNO
"ignore-devno\0" No_argument "\xfd"
#endif
;
#endif