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