/* Copyright 2008 Rob Landley <rob@landley.net>
*
* See http://opengroup.org/onlinepubs/9699919799/utilities/cp.html
* And http://opengroup.org/onlinepubs/9699919799/utilities/mv.html
* And http://refspecs.linuxfoundation.org/LSB_5.0.0/LSB-Core-generic/LSB-Core-generic.html#INSTALL
*
* Posix says "cp -Rf dir file" shouldn't delete file, but our -f does.
*
* Deviations from posix: -adlnrsvF, --preserve... about half the
* functionality in this cp isn't in posix. Posix is stuck in the 1970's.
*
* TODO: --preserve=links
* TODO: what's this _CP_mode system.posix_acl_ business? We chmod()?
// options shared between mv/cp must be in same order (right to left)
// for FLAG macros to work out right in shared infrastructure.
USE_CP(NEWTOY(cp, "<2"USE_CP_PRESERVE("(preserve):;")"RHLPprdaslvnF(remove-destination)fi[-HLPd][-ni]", TOYFLAG_BIN))
USE_MV(NEWTOY(mv, "<2vnF(remove-destination)fi[-ni]", TOYFLAG_BIN))
USE_INSTALL(NEWTOY(install, "<1cdDpsvm:o:g:", TOYFLAG_USR|TOYFLAG_BIN))
config CP
bool "cp"
default y
help
usage: cp [-adlnrsvfipRHLP] SOURCE... DEST
Copy files from SOURCE to DEST. If more than one SOURCE, DEST must
be a directory.
-f delete destination files we can't write to
-F delete any existing destination file first (--remove-destination)
-i interactive, prompt before overwriting existing DEST
-p preserve timestamps, ownership, and mode
-R recurse into subdirectories (DEST must be a directory)
-H Follow symlinks listed on command line
-L Follow all symlinks
-P Do not follow symlinks [default]
-a same as -dpr
-d don't dereference symlinks
-l hard link instead of copy
-n no clobber (don't overwrite DEST)
-r synonym for -R
-s symlink instead of copy
-v verbose
config CP_PRESERVE
bool "cp --preserve support"
default y
depends on CP
help
usage: cp [--preserve=motcxa]
--preserve takes either a comma separated list of attributes, or the first
letter(s) of:
mode - permissions (ignore umask for rwx, copy suid and sticky bit)
ownership - user and group
timestamps - file creation, modification, and access times.
context - security context
xattr - extended attributes
all - all of the above
config MV
bool "mv"
default y
help
usage: mv [-fivn] SOURCE... DEST"
-f force copy by deleting destination file
-i interactive, prompt before overwriting existing DEST
-v verbose
-n no clobber (don't overwrite DEST)
config INSTALL
bool "install"
default y
help
usage: install [-dDpsv] [-o USER] [-g GROUP] [-m MODE] [SOURCE...] DEST
Copy files and set attributes.
-d Act like mkdir -p
-D Create leading directories for DEST
-g Make copy belong to GROUP
-m Set permissions to MODE
-o Make copy belong to USER
-p Preserve timestamps
-s Call "strip -p"
-v Verbose
*/
#define FORCE_FLAGS
#define FOR_cp
#include "toys.h"
GLOBALS(
union {
struct {
// install's options
char *group;
char *user;
char *mode;
} i;
struct {
char *preserve;
} c;
};
char *destname;
struct stat top;
int (*callback)(struct dirtree *try);
uid_t uid;
gid_t gid;
int pflags;
)
struct cp_preserve {
char *name;
} static const cp_preserve[] = TAGGED_ARRAY(CP,
{"mode"}, {"ownership"}, {"timestamps"}, {"context"}, {"xattr"},
);
// Callback from dirtree_read() for each file/directory under a source dir.
static int cp_node(struct dirtree *try)
{
int fdout = -1, cfd = try->parent ? try->parent->extra : AT_FDCWD,
tfd = dirtree_parentfd(try);
unsigned flags = toys.optflags;
char *catch = try->parent ? try->name : TT.destname, *err = "%s";
struct stat cst;
if (!dirtree_notdotdot(try)) return 0;
// If returning from COMEAGAIN, jump straight to -p logic at end.
if (S_ISDIR(try->st.st_mode) && try->again) {
fdout = try->extra;
err = 0;
} else {
// -d is only the same as -r for symlinks, not for directories
if (S_ISLNK(try->st.st_mode) && (flags & FLAG_d)) flags |= FLAG_r;
// Detect recursive copies via repeated top node (cp -R .. .) or
// identical source/target (fun with hardlinks).
if ((TT.top.st_dev == try->st.st_dev && TT.top.st_ino == try->st.st_ino
&& (catch = TT.destname))
|| (!fstatat(cfd, catch, &cst, 0) && cst.st_dev == try->st.st_dev
&& cst.st_ino == try->st.st_ino))
{
error_msg("'%s' is '%s'", catch, err = dirtree_path(try, 0));
free(err);
return 0;
}
// Handle -invF
if (!faccessat(cfd, catch, F_OK, 0) && !S_ISDIR(cst.st_mode)) {
char *s;
if (S_ISDIR(try->st.st_mode)) {
error_msg("dir at '%s'", s = dirtree_path(try, 0));
free(s);
return 0;
} else if ((flags & FLAG_F) && unlinkat(cfd, catch, 0)) {
error_msg("unlink '%s'", catch);
return 0;
} else if (flags & FLAG_n) return 0;
else if (flags & FLAG_i) {
fprintf(stderr, "%s: overwrite '%s'", toys.which->name,
s = dirtree_path(try, 0));
free(s);
if (!yesno(1)) return 0;
}
}
if (flags & FLAG_v) {
char *s = dirtree_path(try, 0);
printf("%s '%s'\n", toys.which->name, s);
free(s);
}
// Loop for -f retry after unlink
do {
// directory, hardlink, symlink, mknod (char, block, fifo, socket), file
// Copy directory
if (S_ISDIR(try->st.st_mode)) {
struct stat st2;
if (!(flags & (FLAG_a|FLAG_r|FLAG_R))) {
err = "Skipped dir '%s'";
catch = try->name;
break;
}
// Always make directory writeable to us, so we can create files in it.
//
// Yes, there's a race window between mkdir() and open() so it's
// possible that -p can be made to chown a directory other than the one
// we created. The closest we can do to closing this is make sure
// that what we open _is_ a directory rather than something else.
if (!mkdirat(cfd, catch, try->st.st_mode | 0200) || errno == EEXIST)
if (-1 != (try->extra = openat(cfd, catch, O_NOFOLLOW)))
if (!fstat(try->extra, &st2) && S_ISDIR(st2.st_mode))
return DIRTREE_COMEAGAIN
| (DIRTREE_SYMFOLLOW*!!(toys.optflags&FLAG_L));
// Hardlink
} else if (flags & FLAG_l) {
if (!linkat(tfd, try->name, cfd, catch, 0)) err = 0;
// Copy tree as symlinks. For non-absolute paths this involves
// appending the right number of .. entries as you go down the tree.
} else if (flags & FLAG_s) {
char *s;
struct dirtree *or;
int dotdots = 0;
s = dirtree_path(try, 0);
for (or = try; or->parent; or = or->parent) dotdots++;
if (*or->name == '/') dotdots = 0;
if (dotdots) {
char *s2 = xmprintf("%*c%s", 3*dotdots, ' ', s);
free(s);
s = s2;
while(dotdots--) {
memcpy(s2, "../", 3);
s2 += 3;
}
}
if (!symlinkat(s, cfd, catch)) {
err = 0;
fdout = AT_FDCWD;
}
free(s);
// Do something _other_ than copy contents of a file?
} else if (!S_ISREG(try->st.st_mode)
&& (try->parent || (flags & (FLAG_a|FLAG_r))))
{
int i;
// make symlink, or make block/char/fifo/socket
if (S_ISLNK(try->st.st_mode)
? ((i = readlinkat0(tfd, try->name, toybuf, sizeof(toybuf))) &&
!symlinkat(toybuf, cfd, catch))
: !mknodat(cfd, catch, try->st.st_mode, try->st.st_rdev))
{
err = 0;
fdout = AT_FDCWD;
}
// Copy contents of file.
} else {
int fdin;
fdin = openat(tfd, try->name, O_RDONLY);
if (fdin < 0) {
catch = try->name;
break;
}
fdout = openat(cfd, catch, O_RDWR|O_CREAT|O_TRUNC, try->st.st_mode);
if (fdout >= 0) {
xsendfile(fdin, fdout);
err = 0;
}
// We only copy xattrs for files because there's no flistxattrat()
if (TT.pflags&(_CP_xattr|_CP_context)) {
ssize_t listlen = flistxattr(fdin, 0, 0), len;
char *name, *value, *list;
if (listlen>0) {
list = xmalloc(listlen);
flistxattr(fdin, list, listlen);
list[listlen-1] = 0; // I do not trust this API.
for (name = list; name-list < listlen; name += strlen(name)+1) {
if (!(TT.pflags&_CP_xattr) && strncmp(name, "security.", 9))
continue;
if ((len = fgetxattr(fdin, name, 0, 0))>0) {
value = xmalloc(len);
if (len == fgetxattr(fdin, name, value, len))
if (fsetxattr(fdout, name, value, len, 0))
perror_msg("%s setxattr(%s=%s)", catch, name, value);
free(value);
}
}
free(list);
}
}
close(fdin);
}
} while (err && (flags & (FLAG_f|FLAG_n)) && !unlinkat(cfd, catch, 0));
}
// Did we make a thing?
if (fdout != -1) {
int rc;
// Inability to set --preserve isn't fatal, some require root access.
// ownership
if (TT.pflags & _CP_ownership) {
// permission bits already correct for mknod and don't apply to symlink
// If we can't get a filehandle to the actual object, use racy functions
if (fdout == AT_FDCWD)
rc = fchownat(cfd, catch, try->st.st_uid, try->st.st_gid,
AT_SYMLINK_NOFOLLOW);
else rc = fchown(fdout, try->st.st_uid, try->st.st_gid);
if (rc && !geteuid()) {
char *pp;
perror_msg("chown '%s'", pp = dirtree_path(try, 0));
free(pp);
}
}
// timestamp
if (TT.pflags & _CP_timestamps) {
struct timespec times[] = {try->st.st_atim, try->st.st_mtim};
if (fdout == AT_FDCWD) utimensat(cfd, catch, times, AT_SYMLINK_NOFOLLOW);
else futimens(fdout, times);
}
// mode comes last because other syscalls can strip suid bit
if (fdout != AT_FDCWD) {
if (TT.pflags & _CP_mode) fchmod(fdout, try->st.st_mode);
xclose(fdout);
}
if (CFG_MV && toys.which->name[0] == 'm')
if (unlinkat(tfd, try->name, S_ISDIR(try->st.st_mode) ? AT_REMOVEDIR :0))
err = "%s";
}
if (err) {
char *f = 0;
if (catch == try->name) {
f = dirtree_path(try, 0);
while (try->parent) try = try->parent;
catch = xmprintf("%s%s", TT.destname, f+strlen(try->name));
free(f);
f = catch;
}
perror_msg(err, catch);
free(f);
}
return 0;
}
void cp_main(void)
{
char *destname = toys.optargs[--toys.optc];
int i, destdir = !stat(destname, &TT.top) && S_ISDIR(TT.top.st_mode);
if (toys.optc>1 && !destdir) error_exit("'%s' not directory", destname);
if (toys.optflags & (FLAG_a|FLAG_p)) {
TT.pflags = CP_mode|CP_ownership|CP_timestamps;
umask(0);
}
// Not using comma_args() (yet?) because interpeting as letters.
if (CFG_CP_PRESERVE && (toys.optflags & FLAG_preserve)) {
char *pre = xstrdup(TT.c.preserve), *s;
if (comma_scan(pre, "all", 1)) TT.pflags = ~0;
for (i=0; i<ARRAY_LEN(cp_preserve); i++)
if (comma_scan(pre, cp_preserve[i].name, 1)) TT.pflags |= 1<<i;
if (*pre) {
// Try to interpret as letters, commas won't set anything this doesn't.
for (s = TT.c.preserve; *s; s++) {
for (i=0; i<ARRAY_LEN(cp_preserve); i++)
if (*s == *cp_preserve[i].name) break;
if (i == ARRAY_LEN(cp_preserve)) {
if (*s == 'a') TT.pflags = ~0;
else break;
} else TT.pflags |= 1<<i;
}
if (*s) error_exit("bad --preserve=%s", pre);
}
free(pre);
}
if (!TT.callback) TT.callback = cp_node;
// Loop through sources
for (i=0; i<toys.optc; i++) {
char *src = toys.optargs[i];
int rc = 1;
if (destdir) TT.destname = xmprintf("%s/%s", destname, basename(src));
else TT.destname = destname;
errno = EXDEV;
if (CFG_MV && toys.which->name[0] == 'm') {
int force = toys.optflags & FLAG_f, no_clobber = toys.optflags & FLAG_n;
if (!force || no_clobber) {
struct stat st;
int exists = !stat(TT.destname, &st);
// Prompt if -i or file isn't writable. Technically "is writable" is
// more complicated (022 is not writeable by the owner, just everybody
// _else_) but I don't care.
if (exists && ((toys.optflags & FLAG_i) || !(st.st_mode & 0222))) {
fprintf(stderr, "%s: overwrite '%s'", toys.which->name, TT.destname);
if (!yesno(1)) rc = 0;
else unlink(TT.destname);
}
// if -n and dest exists, don't try to rename() or copy
if (exists && no_clobber) rc = 0;
}
if (rc) rc = rename(src, TT.destname);
}
// Copy if we didn't mv, skipping nonexistent sources
if (rc) {
if (errno!=EXDEV || dirtree_flagread(src, DIRTREE_SHUTUP+
DIRTREE_SYMFOLLOW*!!(toys.optflags&(FLAG_H|FLAG_L)), TT.callback))
perror_msg("bad '%s'", src);
}
if (destdir) free(TT.destname);
}
}
void mv_main(void)
{
toys.optflags |= FLAG_d|FLAG_p|FLAG_R;
cp_main();
}
// Export cp flags into install's flag context.
static inline int cp_flag_F(void) { return FLAG_F; };
static inline int cp_flag_p(void) { return FLAG_p; };
static inline int cp_flag_v(void) { return FLAG_v; };
// Switch to install's flag context
#define CLEANUP_cp
#define FOR_install
#include <generated/flags.h>
static int install_node(struct dirtree *try)
{
try->st.st_mode = (TT.i.mode)
? string_to_mode(TT.i.mode, try->st.st_mode) : 0755;
if (TT.i.group) try->st.st_gid = TT.gid;
if (TT.i.user) try->st.st_uid = TT.uid;
// Always returns 0 because no -r
cp_node(try);
// No -r so always one level deep, so destname as set by cp_node() is correct
if (toys.optflags & FLAG_s)
if (xrun((char *[]){"strip", "-p", TT.destname, 0})) toys.exitval = 1;
return 0;
}
void install_main(void)
{
char **ss;
int flags = toys.optflags;
if (flags & FLAG_d) {
for (ss = toys.optargs; *ss; ss++) {
if (mkpathat(AT_FDCWD, *ss, 0777, 3)) perror_msg_raw(*ss);
if (flags & FLAG_v) printf("%s\n", *ss);
}
return;
}
if (toys.optflags & FLAG_D) {
TT.destname = toys.optargs[toys.optc-1];
if (mkpathat(AT_FDCWD, TT.destname, 0, 2))
perror_exit("-D '%s'", TT.destname);
if (toys.optc == 1) return;
}
if (toys.optc < 2) error_exit("needs 2 args");
// Translate flags from install to cp
toys.optflags = cp_flag_F();
if (flags & FLAG_v) toys.optflags |= cp_flag_v();
if (flags & (FLAG_p|FLAG_o|FLAG_g)) toys.optflags |= cp_flag_p();
if (TT.i.user) TT.uid = xgetuid(TT.i.user);
if (TT.i.group) TT.gid = xgetgid(TT.i.group);
TT.callback = install_node;
cp_main();
}