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sortix--sortix/utils/cp.c
Jonas 'Sortie' Termansen 601bed32fb Update cp(1) to current coding conventions.
2016-10-03 20:02:12 +02:00

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