614 lines
16 KiB
C
614 lines
16 KiB
C
/*
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* Copyright (c) 2011, 2012, 2013, 2014, 2016 Jonas 'Sortie' Termansen.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* cp.c
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* Copy files and directories.
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*/
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <dirent.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#ifdef CP_PRETEND_TO_BE_INSTALL
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#include <libgen.h>
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#endif
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#include <stdbool.h>
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#include <stddef.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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enum symbolic_dereference
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{
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SYMBOLIC_DEREFERENCE_NONE,
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SYMBOLIC_DEREFERENCE_ARGUMENTS,
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SYMBOLIC_DEREFERENCE_ALWAYS,
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SYMBOLIC_DEREFERENCE_DEFAULT,
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};
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static const int FLAG_RECURSIVE = 1 << 0;
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static const int FLAG_VERBOSE = 1 << 1;
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static const int FLAG_TARGET_DIR = 1 << 2;
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static const int FLAG_NO_TARGET_DIR = 1 << 3;
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static const int FLAG_UPDATE = 1 << 4;
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static const int FLAG_FORCE = 1 << 5;
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#ifdef CP_PRETEND_TO_BE_INSTALL
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static const int FLAG_MKDIR = 1 << 31;
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#endif
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#ifdef CP_PRETEND_TO_BE_INSTALL
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int mkdir_p(const char* path, mode_t mode)
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{
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int saved_errno = errno;
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if ( !mkdir(path, mode) )
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return 0;
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if ( errno == ENOENT )
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{
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char* prev = strdup(path);
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if ( !prev )
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return -1;
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int status = mkdir_p(dirname(prev), mode | 0500);
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free(prev);
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if ( status < 0 )
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return -1;
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errno = saved_errno;
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if ( !mkdir(path, mode) )
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return 0;
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}
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if ( errno == EEXIST )
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return errno = saved_errno, 0;
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return -1;
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}
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#endif
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static char* join_paths(const char* a, const char* b)
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{
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size_t a_len = strlen(a);
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bool has_slash = (a_len && a[a_len-1] == '/') || b[0] == '/';
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char* result;
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if ( (has_slash && asprintf(&result, "%s%s", a, b) < 0) ||
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(!has_slash && asprintf(&result, "%s/%s", a, b) < 0) )
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return NULL;
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return result;
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}
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static bool cp_contents(int srcfd, const char* srcpath,
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int dstfd, const char* dstpath, int flags)
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{
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struct stat srcst, dstst;
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if ( fstat(srcfd, &srcst) )
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{
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warn("stat: %s", srcpath);
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return false;
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}
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if ( fstat(dstfd, &dstst) )
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{
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warn("stat: %s", dstpath);
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return false;
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}
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if ( srcst.st_dev == dstst.st_dev && srcst.st_ino == dstst.st_ino )
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{
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warnx("`%s' and `%s' are the same file", srcpath, dstpath);
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return false;
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}
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if ( S_ISDIR(dstst.st_mode) )
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{
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warnx("cannot overwrite directory `%s' with non-directory", dstpath);
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return false;
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}
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if ( lseek(srcfd, 0, SEEK_SET) )
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{
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warn("can't seek: %s", srcpath);
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return false;
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}
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if ( lseek(dstfd, 0, SEEK_SET) )
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{
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warn("can't seek: %s", dstpath);
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return false;
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}
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if ( flags & FLAG_VERBOSE )
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printf("`%s' -> `%s'\n", srcpath, dstpath);
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if ( ftruncate(dstfd, srcst.st_size) < 0 )
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{
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warn("truncate: %s", dstpath);
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return false;
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}
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static unsigned char buffer[64 * 1024];
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while ( true )
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{
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ssize_t numbytes = read(srcfd, buffer, sizeof(buffer));
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if ( numbytes == 0 )
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break;
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if ( numbytes < 0 )
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{
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warn("read: %s", srcpath);
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return false;
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}
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size_t sofar = 0;
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while ( sofar < (size_t) numbytes )
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{
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size_t left = numbytes - sofar;
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ssize_t amount = write(dstfd, buffer + sofar, left);
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if ( amount <= 0 )
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{
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warn("write: %s", dstpath);
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return false;
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}
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sofar += amount;
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}
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}
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return true;
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}
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static bool cp(int srcdirfd, const char* srcrel, const char* srcpath,
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int dstdirfd, const char* dstrel, const char* dstpath,
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int flags, enum symbolic_dereference symbolic_dereference)
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{
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struct stat srcst;
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int deref_flags = O_RDONLY;
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if ( symbolic_dereference == SYMBOLIC_DEREFERENCE_NONE )
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deref_flags |= O_NOFOLLOW;
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int srcfd = openat(srcdirfd, srcrel, O_RDONLY | deref_flags);
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if ( srcfd < 0 &&
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symbolic_dereference == SYMBOLIC_DEREFERENCE_NONE &&
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errno == ELOOP )
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{
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// TODO: How to handle the update flag in this case?
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struct stat srcst;
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if ( fstatat(srcdirfd, srcrel, &srcst, AT_SYMLINK_NOFOLLOW) < 0 )
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{
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warn("%s", srcpath);
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return false;
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}
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if ( (uintmax_t) SIZE_MAX <= (uintmax_t) srcst.st_size )
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{
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errno = EOVERFLOW;
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warn("%s", srcpath);
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return false;
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}
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size_t size = (size_t) srcst.st_size + 1;
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char* content = (char*) malloc(size);
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if ( !content )
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{
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warn("malloc: %s", srcpath);
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return false;
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}
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ssize_t amount = readlinkat(srcdirfd, srcrel, content, size);
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if ( amount < 0 )
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{
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warn("readlink: %s", srcpath);
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free(content);
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return false;
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}
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if ( size <= (size_t) amount )
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{
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errno = EOVERFLOW;
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warn("readlink: %s", srcpath);
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free(content);
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return false;
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}
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content[amount] = '\0';
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int ret = symlinkat(content, dstdirfd, dstrel);
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if ( ret < 0 && errno == EEXIST )
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{
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if ( unlinkat(dstdirfd, dstrel, 0) == 0 )
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{
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if ( flags & FLAG_VERBOSE )
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printf("removed `%s'\n", dstpath);
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ret = symlinkat(content, dstdirfd, dstrel);
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}
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else if ( errno == EISDIR )
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{
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warnx("cannot overwrite directory `%s' with non-directory",
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dstpath);
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free(content);
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return false;
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}
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else
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{
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warn("unlink: %s", dstpath);
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free(content);
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return false;
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}
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}
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if ( ret < 0 )
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{
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warn("symlink: %s", dstpath);
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free(content);
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return false;
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}
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free(content);
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return true;
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}
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if ( srcfd < 0 )
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{
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warn("%s", srcpath);
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return false;
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}
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if ( fstat(srcfd, &srcst) )
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{
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warn("stat: %s", srcpath);
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return close(srcfd), false;
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}
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if ( symbolic_dereference == SYMBOLIC_DEREFERENCE_ARGUMENTS )
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symbolic_dereference = SYMBOLIC_DEREFERENCE_NONE;
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if ( S_ISDIR(srcst.st_mode) )
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{
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if ( !(flags & FLAG_RECURSIVE) )
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{
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warnx("omitting directory `%s'", srcpath);
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return close(srcfd), false;
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}
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int dstfd = openat(dstdirfd, dstrel, O_RDONLY | O_DIRECTORY);
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if ( dstfd < 0 )
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{
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if ( errno != ENOENT )
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{
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warn("%s", dstpath);
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return close(srcfd), false;
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}
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if ( mkdirat(dstdirfd, dstrel, srcst.st_mode & 03777) )
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{
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warn("cannot create directory `%s'", dstpath);
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return close(srcfd), false;
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}
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int dstfdflags = O_RDONLY | O_DIRECTORY;
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if ( (dstfd = openat(dstdirfd, dstrel, dstfdflags)) < 0 )
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{
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warn("%s", dstpath);
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return close(srcfd), false;
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}
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}
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struct stat srcst, dstst;
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if ( fstat(srcfd, &srcst) < 0 )
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{
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warn("stat: %s", srcpath);
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return close(dstfd), close(srcfd), false;
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}
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if ( fstat(dstfd, &dstst) < 0 )
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{
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warn("stat: %s", dstpath);
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return close(dstfd), close(srcfd), false;
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}
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if ( srcst.st_dev == dstst.st_dev && srcst.st_ino == dstst.st_ino )
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{
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warnx("error: `%s' and `%s' are the same file", srcpath, dstpath);
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return close(dstfd), close(srcfd), false;
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}
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DIR* srcdir = fdopendir(srcfd);
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if ( !srcdir )
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return warn("fdopendir: %s", srcpath), false;
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if ( flags & FLAG_VERBOSE )
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printf("`%s' -> `%s'\n", srcpath, dstpath);
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bool ret = true;
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struct dirent* entry;
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while ( (errno = 0, entry = readdir(srcdir)) )
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{
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const char* name = entry->d_name;
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if ( !strcmp(name, ".") || !strcmp(name, "..") )
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continue;
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char* srcpath_new = join_paths(srcpath, name);
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if ( !srcpath_new )
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err(1, "malloc");
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char* dstpath_new = join_paths(dstpath, name);
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if ( !dstpath_new )
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err(1, "malloc");
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bool ok = cp(dirfd(srcdir), name, srcpath_new,
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dstfd, name, dstpath_new,
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flags, symbolic_dereference);
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free(srcpath_new);
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free(dstpath_new);
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ret = ret && ok;
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}
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if ( errno )
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{
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warn("readdir: %s", srcpath);
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ret = false;
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}
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close(dstfd);
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closedir(srcdir);
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return ret;
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}
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else
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{
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if ( flags & FLAG_UPDATE )
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{
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struct stat dstst;
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if ( fstatat(dstdirfd, dstrel, &dstst, 0) == 0 &&
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S_ISREG(dstst.st_mode) )
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{
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if ( srcst.st_mtim.tv_sec < dstst.st_mtim.tv_sec ||
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(srcst.st_mtim.tv_sec == dstst.st_mtim.tv_sec &&
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srcst.st_mtim.tv_nsec <= dstst.st_mtim.tv_nsec) )
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return close(srcfd), true;
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}
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}
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int oflags = O_WRONLY | O_CREAT;
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mode_t omode = srcst.st_mode & 03777;
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int dstfd = openat(dstdirfd, dstrel, oflags, omode);
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if ( dstfd < 0 &&
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flags & FLAG_FORCE &&
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faccessat(dstdirfd, dstrel, F_OK, AT_SYMLINK_NOFOLLOW) == 0 )
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{
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if ( unlinkat(dstdirfd, dstrel, 0) < 0 )
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{
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warn("%s", dstpath);
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return close(srcfd), false;
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}
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dstfd = openat(dstdirfd, dstrel, oflags, omode);
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}
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if ( dstfd < 0 )
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{
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warn("%s", dstpath);
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return close(srcfd), false;
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}
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bool ret = cp_contents(srcfd, srcpath, dstfd, dstpath, flags);
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close(dstfd);
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close(srcfd);
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return ret;
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}
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}
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static
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bool cp_directory(int srcdirfd, const char* srcrel, const char* srcpath,
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int dstdirfd, const char* dstrel, const char* dstpath,
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int flags, enum symbolic_dereference symbolic_dereference)
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{
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size_t srcrel_last_slash = strlen(srcrel);
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while ( srcrel_last_slash && srcrel[srcrel_last_slash-1] != '/' )
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srcrel_last_slash--;
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const char* src_basename = srcrel + srcrel_last_slash;
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int dstfd = openat(dstdirfd, dstrel, O_RDONLY | O_DIRECTORY);
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if ( dstfd < 0 )
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{
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warn("%s", dstpath);
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return false;
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}
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char* dstpath_new = join_paths(dstpath, src_basename);
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if ( !dstpath_new )
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err(1, "malloc");
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bool ret = cp(srcdirfd, srcrel, srcpath,
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dstfd, src_basename, dstpath_new,
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flags, symbolic_dereference);
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free(dstpath_new);
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return ret;
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}
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static
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bool cp_ambigious(int srcdirfd, const char* srcrel, const char* srcpath,
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int dstdirfd, const char* dstrel, const char* dstpath,
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int flags, enum symbolic_dereference symbolic_dereference)
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{
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struct stat dstst;
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if ( fstatat(dstdirfd, dstrel, &dstst, 0) < 0 )
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{
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if ( errno != ENOENT )
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{
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warn("%s", dstpath);
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return false;
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}
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dstst.st_mode = S_IFREG;
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}
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if ( S_ISDIR(dstst.st_mode) )
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return cp_directory(srcdirfd, srcrel, srcpath,
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dstdirfd, dstrel, dstpath,
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flags, symbolic_dereference);
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else
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return cp(srcdirfd, srcrel, srcpath,
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dstdirfd, dstrel, dstpath,
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flags, symbolic_dereference);
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}
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static void compact_arguments(int* argc, char*** argv)
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{
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for ( int i = 0; i < *argc; i++ )
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{
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while ( i < *argc && !(*argv)[i] )
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{
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for ( int n = i; n < *argc; n++ )
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(*argv)[n] = (*argv)[n+1];
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(*argc)--;
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}
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}
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}
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int main(int argc, char* argv[])
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{
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int flags = 0;
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const char* target_directory = NULL;
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const char* preserve_list = NULL;
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enum symbolic_dereference symbolic_dereference = SYMBOLIC_DEREFERENCE_DEFAULT;
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for ( int i = 1; i < argc; i++ )
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{
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const char* arg = argv[i];
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if ( arg[0] != '-' || !arg[1] )
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continue;
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argv[i] = NULL;
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if ( !strcmp(arg, "--") )
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break;
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if ( arg[1] != '-' )
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{
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char c;
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while ( (c = *++arg) ) switch ( c )
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{
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#ifdef CP_PRETEND_TO_BE_INSTALL
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case 'b': /* ignored */ break;
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case 'c': /* ignored */ break;
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case 'C': /* ignored */ break;
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case 'd': flags |= FLAG_MKDIR; break;
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case 'g': if ( *(arg + 1) ) arg = "g"; else if ( i + 1 != argc ) argv[++i] = NULL; break;
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case 'm': if ( *(arg + 1) ) arg = "m"; else if ( i + 1 != argc ) argv[++i] = NULL; break;
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case 'o': if ( *(arg + 1) ) arg = "o"; else if ( i + 1 != argc ) argv[++i] = NULL; break;
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case 's': /* ignored */ break;
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#endif
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case 'f': flags |= FLAG_FORCE; break;
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case 'H': symbolic_dereference = SYMBOLIC_DEREFERENCE_ARGUMENTS; break;
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case 'L': symbolic_dereference = SYMBOLIC_DEREFERENCE_ALWAYS; break;
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case 'r':
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case 'R': flags |= FLAG_RECURSIVE; break;
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case 'v': flags |= FLAG_VERBOSE; break;
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case 't':
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flags |= FLAG_TARGET_DIR;
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if ( *(arg + 1) )
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target_directory = arg + 1;
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else if ( i + 1 == argc )
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errx(1, "option requires an argument -- '%c'", c);
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else
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{
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target_directory = argv[i+1];
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argv[++i] = NULL;
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}
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arg = "t";
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break;
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case 'T': flags |= FLAG_NO_TARGET_DIR; break;
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case 'u': flags |= FLAG_UPDATE; break;
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case 'p': preserve_list = "mode,ownership,timestamps"; break;
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case 'P': symbolic_dereference = SYMBOLIC_DEREFERENCE_NONE; break;
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default:
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#ifdef CP_PRETEND_TO_BE_INSTALL
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fprintf(stderr, "%s (fake): unknown option, ignoring -- '%c'\n",
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argv[0], c);
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continue;
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#endif
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errx(1, "unknown option -- '%c'", c);
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}
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}
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else if ( !strcmp(arg, "--dereference") )
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symbolic_dereference = SYMBOLIC_DEREFERENCE_ALWAYS;
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else if ( !strcmp(arg, "--recursive") )
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flags |= FLAG_RECURSIVE;
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else if ( !strcmp(arg, "--verbose") )
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flags |= FLAG_VERBOSE;
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else if ( !strcmp(arg, "--preserve") )
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preserve_list = "mode,ownership,timestamps";
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else if ( !strncmp(arg, "--preserve=", strlen("--preserve=")) )
|
|
preserve_list = arg + strlen("--preserve=");
|
|
else if ( !strcmp(arg, "--target-directory") )
|
|
{
|
|
if ( i + 1 == argc )
|
|
errx(1, "option '--target-directory' requires an argument");
|
|
target_directory = argv[++i];
|
|
argv[i] = NULL;
|
|
flags |= FLAG_TARGET_DIR;
|
|
}
|
|
else if ( !strncmp(arg, "--target-directory=", strlen("--target-directory=")) )
|
|
{
|
|
target_directory = arg + strlen("--target-directory=");
|
|
flags |= FLAG_TARGET_DIR;
|
|
}
|
|
else if ( !strcmp(arg, "--no-target-directory") )
|
|
flags |= FLAG_NO_TARGET_DIR;
|
|
else if ( !strcmp(arg, "--update") )
|
|
flags |= FLAG_UPDATE;
|
|
else if ( !strcmp(arg, "--no-dereference") )
|
|
symbolic_dereference = SYMBOLIC_DEREFERENCE_NONE;
|
|
else
|
|
{
|
|
#ifdef CP_PRETEND_TO_BE_INSTALL
|
|
fprintf(stderr, "%s (fake): unknown option, ignoring: %s\n", argv[0], arg);
|
|
continue;
|
|
#endif
|
|
errx(1, "unknown option: %s", arg);
|
|
}
|
|
}
|
|
|
|
if ( (flags & FLAG_TARGET_DIR) && (flags & FLAG_NO_TARGET_DIR) )
|
|
errx(1, "cannot combine --target-directory (-t) and --no-target-directory (-T)");
|
|
|
|
if ( symbolic_dereference == SYMBOLIC_DEREFERENCE_DEFAULT )
|
|
{
|
|
if ( flags & FLAG_RECURSIVE )
|
|
symbolic_dereference = SYMBOLIC_DEREFERENCE_NONE;
|
|
else
|
|
symbolic_dereference = SYMBOLIC_DEREFERENCE_ALWAYS;
|
|
}
|
|
|
|
// TODO: Actually preserve.
|
|
(void) preserve_list;
|
|
|
|
compact_arguments(&argc, &argv);
|
|
|
|
if ( argc < 2 )
|
|
errx(1, "missing file operand");
|
|
|
|
#ifdef CP_PRETEND_TO_BE_INSTALL
|
|
if ( flags & FLAG_MKDIR )
|
|
{
|
|
bool success = true;
|
|
for ( int i = 1; i < argc; i++ )
|
|
{
|
|
if ( mkdir_p(argv[i], 0777) < 0 )
|
|
{
|
|
warn("%s", argv[i]);
|
|
success = false;
|
|
}
|
|
}
|
|
return success ? 0 : 1;
|
|
}
|
|
#endif
|
|
|
|
if ( flags & FLAG_NO_TARGET_DIR )
|
|
{
|
|
const char* src = argv[1];
|
|
if ( argc < 3 )
|
|
errx(1, "missing destination file operand after `%s'", src);
|
|
const char* dst = argv[2];
|
|
if ( 3 < argc )
|
|
errx(1, "extra operand `%s'", argv[3]);
|
|
return cp(AT_FDCWD, src, src,
|
|
AT_FDCWD, dst, dst,
|
|
flags, symbolic_dereference) ? 0 : 1;
|
|
}
|
|
|
|
if ( !(flags & FLAG_TARGET_DIR) && argc <= 3 )
|
|
{
|
|
const char* src = argv[1];
|
|
if ( argc < 3 )
|
|
errx(1, "missing destination file operand after `%s'", src);
|
|
const char* dst = argv[2];
|
|
return cp_ambigious(AT_FDCWD, src, src,
|
|
AT_FDCWD, dst, dst,
|
|
flags, symbolic_dereference) ? 0 : 1;
|
|
}
|
|
|
|
if ( !target_directory )
|
|
{
|
|
target_directory = argv[--argc];
|
|
argv[argc] = NULL;
|
|
}
|
|
|
|
if ( argc < 2 )
|
|
errx(1, "missing file operand");
|
|
|
|
bool success = true;
|
|
for ( int i = 1; i < argc; i++ )
|
|
{
|
|
const char* src = argv[i];
|
|
const char* dst = target_directory;
|
|
if ( !cp_directory(AT_FDCWD, src, src,
|
|
AT_FDCWD, dst, dst,
|
|
flags, symbolic_dereference) )
|
|
success = false;
|
|
}
|
|
|
|
return success ? 0 : 1;
|
|
}
|