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cp: implement -n

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function                                             old     new   delta
.rodata                                           103681  103722     +41
packed_usage                                       33698   33717     +19
copy_file                                           1678    1696     +18
cp_main                                              500     492      -8
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 3/1 up/down: 78/-8)              Total: 70 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2021-06-22 15:28:34 +02:00
parent 91b9549a8c
commit 56bbbfae7d
3 changed files with 28 additions and 22 deletions
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19
coreutils/cp.c
View File

@ -84,8 +84,8 @@
// (SELinux) set SELinux security context of copy to CONTEXT
//usage:#define cp_trivial_usage
//usage: "[-arPLHpfilsTu] SOURCE DEST\n"
//usage: "or: cp [-arPLHpfilsu] SOURCE... { -t DIRECTORY | DIRECTORY }"
//usage: "[-arPLHpfinlsTu] SOURCE DEST\n"
//usage: "or: cp [-arPLHpfinlsu] SOURCE... { -t DIRECTORY | DIRECTORY }"
//usage:#define cp_full_usage "\n\n"
//usage: "Copy SOURCEs to DEST\n"
//usage: "\n -a Same as -dpR"
@ -99,6 +99,7 @@
//usage: "\n -p Preserve file attributes if possible"
//usage: "\n -f Overwrite"
//usage: "\n -i Prompt before overwrite"
//usage: "\n -n Don't overwrite"
//usage: "\n -l,-s Create (sym)links"
//usage: "\n -T Refuse to copy if DEST is a directory"
//usage: "\n -t DIR Copy all SOURCEs into DIR"
@ -122,9 +123,9 @@ int cp_main(int argc, char **argv)
int status;
enum {
#if ENABLE_FEATURE_CP_LONG_OPTIONS
/*OPT_rmdest = FILEUTILS_RMDEST = 1 << FILEUTILS_CP_OPTNUM */
OPT_parents = 1 << (FILEUTILS_CP_OPTNUM+1),
OPT_reflink = 1 << (FILEUTILS_CP_OPTNUM+2),
/*OPT_rmdest = FILEUTILS_RMDEST = 1 << FILEUTILS_CP_OPTBITS */
OPT_parents = 1 << (FILEUTILS_CP_OPTBITS+1),
OPT_reflink = 1 << (FILEUTILS_CP_OPTBITS+2),
#endif
};
#if ENABLE_FEATURE_CP_LONG_OPTIONS
@ -134,23 +135,25 @@ int cp_main(int argc, char **argv)
flags = getopt32long(argv, "^"
FILEUTILS_CP_OPTSTR
"\0"
// Need at least two arguments
// Need at least one argument. (Usually two+, but -t DIR can have only one)
// Soft- and hardlinking doesn't mix
// -P and -d are the same (-P is POSIX, -d is GNU)
// -r and -R are the same
// -R (and therefore -r) turns on -d (coreutils does this)
// -a = -pdR
/* At least one argument. (Usually two+, but -t DIR can have only one) */
"-1:l--s:s--l:Pd:rRd:Rd:apdR",
// -i overrides -n and vice versa (last wins)
"-1:l--s:s--l:Pd:rRd:Rd:apdR:i-n:n-i",
"archive\0" No_argument "a"
"force\0" No_argument "f"
"interactive\0" No_argument "i"
"no-clobber\0" No_argument "n"
"link\0" No_argument "l"
"dereference\0" No_argument "L"
"no-dereference\0" No_argument "P"
"recursive\0" No_argument "R"
"symbolic-link\0" No_argument "s"
"no-target-directory\0" No_argument "T"
"target-directory\0" Required_argument "t"
"verbose\0" No_argument "v"
"update\0" No_argument "u"
"remove-destination\0" No_argument "\xff"

29
include/libbb.h
View File

@ -450,28 +450,29 @@ enum { /* cp.c, mv.c, install.c depend on these values. CAREFUL when changing th
FILEUTILS_RECUR = 1 << 2, /* -R */
FILEUTILS_FORCE = 1 << 3, /* -f */
FILEUTILS_INTERACTIVE = 1 << 4, /* -i */
FILEUTILS_MAKE_HARDLINK = 1 << 5, /* -l */
FILEUTILS_MAKE_SOFTLINK = 1 << 6, /* -s */
FILEUTILS_DEREF_SOFTLINK = 1 << 7, /* -L */
FILEUTILS_DEREFERENCE_L0 = 1 << 8, /* -H */
FILEUTILS_NO_OVERWRITE = 1 << 5, /* -n */
FILEUTILS_MAKE_HARDLINK = 1 << 6, /* -l */
FILEUTILS_MAKE_SOFTLINK = 1 << 7, /* -s */
FILEUTILS_DEREF_SOFTLINK = 1 << 8, /* -L */
FILEUTILS_DEREFERENCE_L0 = 1 << 9, /* -H */
/* -a = -pdR (mapped in cp.c) */
/* -r = -dR (mapped in cp.c) */
/* -P = -d (mapped in cp.c) */
FILEUTILS_VERBOSE = (1 << 12) * ENABLE_FEATURE_VERBOSE, /* -v */
FILEUTILS_UPDATE = 1 << 13, /* -u */
FILEUTILS_NO_TARGET_DIR = 1 << 14, /* -T */
FILEUTILS_TARGET_DIR = 1 << 15, /* -t DIR */
FILEUTILS_VERBOSE = (1 << 13) * ENABLE_FEATURE_VERBOSE, /* -v */
FILEUTILS_UPDATE = 1 << 14, /* -u */
FILEUTILS_NO_TARGET_DIR = 1 << 15, /* -T */
FILEUTILS_TARGET_DIR = 1 << 16, /* -t DIR */
#if ENABLE_SELINUX
FILEUTILS_PRESERVE_SECURITY_CONTEXT = 1 << 16, /* -c */
FILEUTILS_PRESERVE_SECURITY_CONTEXT = 1 << 17, /* -c */
#endif
#define FILEUTILS_CP_OPTSTR "pdRfilsLHarPvuTt:" IF_SELINUX("c")
#define FILEUTILS_CP_OPTSTR "pdRfinlsLHarPvuTt:" IF_SELINUX("c")
/* How many bits in FILEUTILS_CP_OPTSTR? */
FILEUTILS_CP_OPTNUM = 17 - !ENABLE_SELINUX,
FILEUTILS_CP_OPTBITS = 18 - !ENABLE_SELINUX,
FILEUTILS_RMDEST = 1 << (17 - !ENABLE_SELINUX), /* --remove-destination */
FILEUTILS_RMDEST = 1 << (19 - !ENABLE_SELINUX), /* cp --remove-destination */
/* bit 18 skipped for "cp --parents" */
FILEUTILS_REFLINK = 1 << (19 - !ENABLE_SELINUX), /* cp --reflink=auto */
FILEUTILS_REFLINK_ALWAYS = 1 << (20 - !ENABLE_SELINUX), /* cp --reflink[=always] */
FILEUTILS_REFLINK = 1 << (20 - !ENABLE_SELINUX), /* cp --reflink=auto */
FILEUTILS_REFLINK_ALWAYS = 1 << (21 - !ENABLE_SELINUX), /* cp --reflink[=always] */
/*
* Hole. cp may have some bits set here,
* they should not affect remove_file()/copy_file()

2
libbb/copy_file.c
View File

@ -111,6 +111,8 @@ int FAST_FUNC copy_file(const char *source, const char *dest, int flags)
bb_error_msg("'%s' and '%s' are the same file", source, dest);
return -1;
}
if (flags & FILEUTILS_NO_OVERWRITE) /* cp -n */
return 0;
dest_exists = 1;
}