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sortix--sortix/utils/cp.cpp
Jonas 'Sortie' Termansen ba29cad8a3 Improve cp(1).
2014-11-27 01:36:52 +01:00

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/*******************************************************************************
Copyright(C) Jonas 'Sortie' Termansen 2011, 2012, 2013, 2014.
This program is free software: you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the Free
Software Foundation, either version 3 of the License, or (at your option)
any later version.
This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
more details.
You should have received a copy of the GNU General Public License along with
this program. If not, see <http://www.gnu.org/licenses/>.
cp.cpp
Copy files and directories.
*******************************************************************************/
#include <sys/stat.h>
#include <sys/types.h>
#include <dirent.h>
#include <errno.h>
#include <error.h>
#include <fcntl.h>
#include <stddef.h>
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <timespec.h>
#include <unistd.h>
#if !defined(VERSIONSTR)
#define VERSIONSTR "unknown version"
#endif
const char* BaseName(const char* path)
{
size_t len = strlen(path);
while ( len-- )
if ( path[len] == '/' )
return path + len + 1;
return path;
}
char* AddElemToPath(const char* path, const char* elem)
{
size_t pathlen = strlen(path);
size_t elemlen = strlen(elem);
if ( pathlen && path[pathlen-1] == '/' )
{
char* ret = (char*) malloc(sizeof(char) * (pathlen + elemlen + 1));
stpcpy(stpcpy(ret, path), elem);
return ret;
}
char* ret = (char*) malloc(sizeof(char) * (pathlen + 1 + elemlen + 1));
stpcpy(stpcpy(stpcpy(ret, path), "/"), elem);
return ret;
}
const int FLAG_RECURSIVE = 1 << 0;
const int FLAG_VERBOSE = 1 << 1;
const int FLAG_TARGET_DIR = 1 << 2;
const int FLAG_NO_TARGET_DIR = 1 << 3;
const int FLAG_UPDATE = 1 << 4;
const int FLAG_NO_DEREFERENCE = 1 << 5;
const int FLAG_DEREFERENCE = 1 << 6;
const int FLAG_DEREFERENCE_ARGUMENTS = 1 << 7;
bool CopyFileContents(int srcfd, const char* srcpath,
int dstfd, const char* dstpath, int flags);
bool CopyDirectoryContents(int srcfd, const char* srcpath,
int dstfd, const char* dstpath, int flags);
bool CopyToDest(int srcdirfd, const char* srcrel, const char* srcpath,
int dstdirfd, const char* dstrel, const char* dstpath,
int flags);
bool CopyIntoDirectory(int srcdirfd, const char* srcrel, const char* srcpath,
int dstdirfd, const char* dstrel, const char* dstpath,
int flags);
bool CopyAmbigious(int srcdirfd, const char* srcrel, const char* srcpath,
int dstdirfd, const char* dstrel, const char* dstpath,
int flags);
bool CopyFileContents(int srcfd, const char* srcpath,
int dstfd, const char* dstpath, int flags)
{
struct stat srcst, dstst;
if ( fstat(srcfd, &srcst) )
{
error(0, errno, "stat: %s", srcpath);
return false;
}
if ( fstat(dstfd, &dstst) )
{
error(0, errno, "stat: %s", dstpath);
return false;
}
if ( srcst.st_dev == dstst.st_dev && srcst.st_ino == dstst.st_ino )
{
error(0, 0, "`%s' and `%s' are the same file", srcpath, dstpath);
return false;
}
if ( S_ISDIR(dstst.st_mode) )
{
error(0, 0, "cannot overwrite directory `%s' with non-directory",
dstpath);
return false;
}
if ( lseek(srcfd, 0, SEEK_SET) )
{
error(0, errno, "can't seek: %s", srcpath);
return false;
}
if ( lseek(dstfd, 0, SEEK_SET) )
{
error(0, errno, "can't seek: %s", dstpath);
return false;
}
if ( flags & FLAG_VERBOSE )
printf("`%s' -> `%s'\n", srcpath, dstpath);
ftruncate(dstfd, srcst.st_size);
size_t BUFFER_SIZE = 16 * 1024;
uint8_t buffer[BUFFER_SIZE];
while ( true )
{
ssize_t numbytes = read(srcfd, buffer, BUFFER_SIZE);
if ( numbytes == 0 )
break;
if ( numbytes < 0 )
{
error(0, errno, "read: %s", srcpath);
return false;
}
size_t sofar = 0;
while ( sofar < (size_t) numbytes )
{
ssize_t amount = write(dstfd, buffer + sofar, numbytes - sofar);
if ( amount <= 0 )
{
error(0, errno, "write: %s", dstpath);
return false;
}
sofar += amount;
}
}
return true;
}
bool CopyDirectoryContentsInner(DIR* srcdir, const char* srcpath,
DIR* dstdir, const char* dstpath, int flags)
{
if ( flags & FLAG_VERBOSE )
printf("`%s' -> `%s'\n", srcpath, dstpath);
bool ret = true;
struct dirent* entry;
while ( (entry = readdir(srcdir)) )
{
const char* name = entry->d_name;
if ( !strcmp(name, ".") || !strcmp(name, "..") )
continue;
char* srcpath_new = AddElemToPath(srcpath, name);
char* dstpath_new = AddElemToPath(dstpath, name);
bool ok = CopyToDest(dirfd(srcdir), name, srcpath_new,
dirfd(dstdir), name, dstpath_new, flags);
free(srcpath_new);
free(dstpath_new);
if ( !ok )
ret = false;
}
return ret;
}
bool CopyDirectoryContentsOuter(int srcfd, const char* srcpath,
int dstfd, const char* dstpath, int flags)
{
struct stat srcst, dstst;
if ( fstat(srcfd, &srcst) < 0 )
{
error(0, errno, "stat: %s", srcpath);
return false;
}
if ( fstat(dstfd, &dstst) < 0 )
{
error(0, errno, "stat: %s", dstpath);
return false;
}
if ( srcst.st_dev == dstst.st_dev && srcst.st_ino == dstst.st_ino )
{
error(0, 0, "error: `%s' and `%s' are the same file", srcpath, dstpath);
return false;
}
DIR* srcdir = fdopendir(srcfd);
if ( !srcdir )
return error(0, errno, "fdopendir()"), false;
DIR* dstdir = fdopendir(dstfd);
if ( !dstdir )
return error(0, errno, "fdopendir()"), closedir(srcdir), false;
bool ret = CopyDirectoryContentsInner(srcdir, srcpath, dstdir, dstpath,
flags);
closedir(dstdir);
closedir(srcdir);
return ret;
}
bool CopyDirectoryContents(int srcfd, const char* srcpath,
int dstfd, const char* dstpath, int flags)
{
int srcfd_copy = dup(srcfd);
if ( srcfd_copy < 0 )
return error(0, errno, "dup"), false;
int dstfd_copy = dup(dstfd);
if ( dstfd_copy < 0 )
return error(0, errno, "dup"), close(srcfd_copy), false;
bool ret = CopyDirectoryContentsOuter(srcfd_copy, srcpath,
dstfd_copy, dstpath, flags);
close(dstfd_copy);
close(srcfd_copy);
return ret;
}
bool CopyToDest(int srcdirfd, const char* srcrel, const char* srcpath,
int dstdirfd, const char* dstrel, const char* dstpath,
int flags)
{
struct stat srcst;
bool ret = false;
int srcfd = openat(srcdirfd, srcrel, O_RDONLY);
if ( srcfd < 0 )
{
error(0, errno, "%s", srcpath);
return false;
}
if ( fstat(srcfd, &srcst) )
{
error(0, errno, "stat: %s", srcpath);
return close(srcfd), false;
}
if ( S_ISDIR(srcst.st_mode) )
{
if ( !(flags & FLAG_RECURSIVE) )
{
error(0, 0, "omitting directory `%s'", srcpath);
return close(srcfd), false;
}
int dstfd = openat(dstdirfd, dstrel, O_RDONLY | O_DIRECTORY);
if ( dstfd < 0 )
{
if ( errno != ENOENT )
{
error(0, errno, "%s", dstpath);
return close(srcfd), false;
}
if ( mkdirat(dstdirfd, dstrel, srcst.st_mode & 03777) )
{
error(0, errno, "cannot create directory `%s'", dstpath);
return close(srcfd), false;
}
if ( (dstfd = openat(dstdirfd, dstrel, O_RDONLY | O_DIRECTORY)) < 0 )
{
error(0, errno, "%s", dstpath);
return close(srcfd), false;
}
}
ret = CopyDirectoryContents(srcfd, srcpath, dstfd, dstpath, flags);
close(dstfd);
}
else
{
if ( flags & FLAG_UPDATE )
{
struct stat dstst;
if ( fstatat(dstdirfd, dstrel, &dstst, 0) == 0 && S_ISREG(dstst.st_mode) )
{
if ( timespec_le(srcst.st_mtim, dstst.st_mtim) )
return close(srcfd), true;
}
}
int dstfd = openat(dstdirfd, dstrel, O_WRONLY | O_CREAT, srcst.st_mode & 03777);
if ( dstfd < 0 )
{
error(0, errno, "%s", dstpath);
return close(srcfd), false;
}
ret = CopyFileContents(srcfd, srcpath, dstfd, dstpath, flags);
close(dstfd);
}
close(srcfd);
return ret;
}
bool CopyIntoDirectory(int srcdirfd, const char* srcrel, const char* srcpath,
int dstdirfd, const char* dstrel, const char* dstpath,
int flags)
{
const char* src_basename = BaseName(srcrel);
int dstfd = openat(dstdirfd, dstrel, O_RDONLY | O_DIRECTORY);
if ( dstfd < 0 )
{
error(0, errno, "%s", dstpath);
return false;
}
char* dstpath_new = AddElemToPath(dstpath, src_basename);
bool ret = CopyToDest(srcdirfd, srcrel, srcpath,
dstfd, src_basename, dstpath_new, flags);
free(dstpath_new);
return ret;
}
bool CopyAmbigious(int srcdirfd, const char* srcrel, const char* srcpath,
int dstdirfd, const char* dstrel, const char* dstpath,
int flags)
{
struct stat dstst;
if ( fstatat(dstdirfd, dstrel, &dstst, 0) < 0 )
{
if ( errno != ENOENT )
{
error(0, errno, "%s", dstpath);
return false;
}
dstst.st_mode = S_IFREG;
}
if ( S_ISDIR(dstst.st_mode) )
return CopyIntoDirectory(srcdirfd, srcrel, srcpath,
dstdirfd, dstrel, dstpath, flags);
else
return CopyToDest(srcdirfd, srcrel, srcpath,
dstdirfd, dstrel, dstpath, flags);
}
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)--;
}
}
}
void help(FILE* fp, const char* argv0)
{
fprintf(fp, "Usage: %s [OPTION]... [-T] SOURCE DEST\n", argv0);
fprintf(fp, " or: %s [OPTION]... SOURCE... DIRECTORY\n", argv0);
fprintf(fp, " or: %s [OPTION]... -t DIRECTORY SOURCE...\n", argv0);
#ifdef CP_PRETEND_TO_BE_INSTALL
fprintf(fp, "Copy files and set attributes.\n");
#else
fprintf(fp, "Copy SOURCE to DEST, or multiple SOURCE(s) to DIRECTORY.\n");
#endif
}
void version(FILE* fp, const char* argv0)
{
fprintf(fp, "%s (Sortix) %s\n", argv0, VERSIONSTR);
fprintf(fp, "License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.\n");
fprintf(fp, "This is free software: you are free to change and redistribute it.\n");
fprintf(fp, "There is NO WARRANTY, to the extent permitted by law.\n");
}
int main(int argc, char* argv[])
{
const char* argv0 = argv[0];
int flags = 0;
const char* target_directory = NULL;
for ( int i = 1; i < argc; i++ )
{
const char* arg = argv[i];
if ( arg[0] != '-' )
continue;
argv[i] = NULL;
if ( !strcmp(arg, "--") )
break;
if ( arg[1] != '-' )
{
while ( char c = *++arg ) switch ( c )
{
case 'H': flags |= FLAG_DEREFERENCE_ARGUMENTS; break;
case 'L': flags |= FLAG_DEREFERENCE; 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 )
{
error(0, 0, "option requires an argument -- '%c'", c);
fprintf(stderr, "Try '%s --help' for more information\n", argv0);
exit(1);
}
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': flags |= FLAG_NO_DEREFERENCE; break;
default:
#ifdef CP_PRETEND_TO_BE_INSTALL
fprintf(stderr, "%s (fake): unknown option, ignoring -- '%c'\n", argv0, c);
continue;
#endif
fprintf(stderr, "%s: unknown option -- '%c'\n", argv0, c);
help(stderr, argv0);
exit(1);
}
}
else if ( !strcmp(arg, "--help") )
help(stdout, argv0), exit(0);
else if ( !strcmp(arg, "--version") )
version(stdout, argv0), exit(0);
else if ( !strcmp(arg, "--dereference") )
flags |= FLAG_DEREFERENCE;
else if ( !strcmp(arg, "--recursive") )
flags |= FLAG_RECURSIVE;
else if ( !strcmp(arg, "--verbose") )
flags |= FLAG_VERBOSE;
else if ( !strcmp(arg, "--target-directory") )
{
if ( i + 1 == argc )
{
error(0, 0, "option '--target-directory 'requires an argument");
fprintf(stderr, "Try '%s --help' for more information\n", argv0);
exit(1);
}
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") )
flags |= FLAG_NO_DEREFERENCE;
else
{
#ifdef CP_PRETEND_TO_BE_INSTALL
fprintf(stderr, "%s (fake): unknown option, ignoring: %s\n", argv0, arg);
continue;
#endif
fprintf(stderr, "%s: unknown option: %s\n", argv0, arg);
help(stderr, argv0);
exit(1);
}
}
if ( (flags & FLAG_TARGET_DIR) && (flags & FLAG_NO_TARGET_DIR) )
error(1, 0, "cannot combine --target-directory (-t) and --no-target-directory (-T)");
compact_arguments(&argc, &argv);
if ( argc < 2 )
error(1, 0, "missing file operand");
if ( flags & FLAG_NO_TARGET_DIR )
{
const char* src = argv[1];
if ( argc < 3 )
error(1, 0, "missing destination file operand after `%s'", src);
const char* dst = argv[2];
if ( 3 < argc )
error(1, 0, "extra operand `%s'", argv[3]);
return CopyToDest(AT_FDCWD, src, src, AT_FDCWD, dst, dst, flags) ? 0 : 1;
}
if ( !(flags & FLAG_TARGET_DIR) && argc <= 3 )
{
const char* src = argv[1];
if ( argc < 3 )
error(1, 0, "missing destination file operand after `%s'", src);
const char* dst = argv[2];
if ( 3 < argc )
error(1, 0, "extra operand `%s'", argv[3]);
return CopyAmbigious(AT_FDCWD, src, src, AT_FDCWD, dst, dst, flags) ? 0 : 1;
}
if ( !target_directory )
{
target_directory = argv[--argc];
argv[argc] = NULL;
}
if ( argc < 2 )
error(1, 0, "missing file operand");
bool success = true;
for ( int i = 1; i < argc; i++ )
{
const char* src = argv[i];
const char* dst = target_directory;
if ( !CopyIntoDirectory(AT_FDCWD, src, src, AT_FDCWD, dst, dst, flags) )
success = false;
}
return success ? 0 : 1;
}
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