/* 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. 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) ? (0 < (i = readlinkat(tfd, try->name, toybuf, sizeof(toybuf))) && sizeof(toybuf) > i && !(toybuf[i] = '\0') && !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 = xgetpwnamid(TT.i.user)->pw_uid; if (TT.i.group) TT.gid = xgetgrnamid(TT.i.group)->gr_gid; TT.callback = install_node; cp_main(); }