646 lines
18 KiB
C
646 lines
18 KiB
C
/*
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* Copyright 2005 The Android Open Source Project
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*
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* Android "cp" replacement.
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*
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* The GNU/Linux "cp" uses O_LARGEFILE in its open() calls, utimes() instead
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* of utime(), and getxattr()/setxattr() instead of chmod(). These are
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* probably "better", but are non-portable, and not necessary for our
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* purposes.
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*/
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#include <host/CopyFile.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <getopt.h>
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#include <dirent.h>
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#include <fcntl.h>
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#include <utime.h>
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#include <limits.h>
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#include <errno.h>
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#include <assert.h>
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#ifdef HAVE_MS_C_RUNTIME
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# define mkdir(path,mode) _mkdir(path)
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#endif
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#ifndef HAVE_SYMLINKS
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# define lstat stat
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# ifndef EACCESS /* seems to be missing from the Mingw headers */
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# define EACCESS 13
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# endif
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#endif
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#ifndef O_BINARY
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# define O_BINARY 0
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#endif
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/*#define DEBUG_MSGS*/
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#ifdef DEBUG_MSGS
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# define DBUG(x) printf x
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#else
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# define DBUG(x) ((void)0)
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#endif
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#define FSSEP '/' /* filename separator char */
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static int copyFileRecursive(const char* src, const char* dst, bool isCmdLine, unsigned int options);
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/*
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* Returns true if the source file is newer than the destination file.
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*
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* The check is based on the modification date, whole seconds only. This
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* also returns true if the file sizes don't match.
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*/
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static bool isSourceNewer(const struct stat* pSrcStat, const struct stat* pDstStat)
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{
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return (pSrcStat->st_mtime > pDstStat->st_mtime) ||
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(pSrcStat->st_size != pDstStat->st_size);
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}
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/*
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* Returns true if the source file has high resolution modification
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* date. Cygwin/Mingw doesn't support st_mtim and always returns false.
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*/
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static bool isHiresMtime(const struct stat* pSrcStat)
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{
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#if HAVE_STAT_ST_MTIM
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#if defined(MACOSX_RSRC)
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return pSrcStat->st_mtimespec.tv_nsec > 0;
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#else
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return pSrcStat->st_mtim.tv_nsec > 0;
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#endif
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#else
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return 0;
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#endif
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}
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/*
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* Returns true if the source and destination files are actually the
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* same thing. We detect this by checking the inode numbers, which seems
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* to work on Cygwin.
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*/
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static bool isSameFile(const struct stat* pSrcStat, const struct stat* pDstStat)
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{
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#ifndef HAVE_VALID_STAT_ST_INO
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/* with MSVCRT.DLL, stat always sets st_ino to 0, and there is no simple way to */
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/* get the equivalent information with Win32 (Cygwin does some weird stuff in */
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/* its winsup/cygwin/fhandler_disk_file.cc to emulate this, too complex for us) */
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return 0;
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#else
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return (pSrcStat->st_ino == pDstStat->st_ino);
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#endif
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}
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static void printCopyMsg(const char* src, const char* dst, unsigned int options)
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{
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if ((options & COPY_VERBOSE_MASK) > 0)
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printf(" '%s' --> '%s'\n", src, dst);
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}
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static void printNotNewerMsg(const char* src, const char* dst, unsigned int options)
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{
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if ((options & COPY_VERBOSE_MASK) > 1)
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printf(" '%s' is up-to-date\n", dst);
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}
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/*
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* Copy the contents of one file to another.
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*
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* The files are assumed to be seeked to the start.
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*/
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static int copyFileContents(const char* dst, int dstFd, const char* src, int srcFd)
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{
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unsigned char buf[8192];
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ssize_t readCount, writeCount;
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/*
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* Read a chunk, write it, and repeat.
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*/
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while (1) {
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readCount = read(srcFd, buf, sizeof(buf));
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if (readCount < 0) {
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fprintf(stderr,
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"acp: failed reading '%s': %s\n", src, strerror(errno));
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return -1;
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}
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if (readCount > 0) {
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writeCount = write(dstFd, buf, readCount);
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if (writeCount < 0) {
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fprintf(stderr,
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"acp: failed writing '%s': %s\n", dst, strerror(errno));
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return -1;
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}
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if (writeCount != readCount) {
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fprintf(stderr, "acp: partial write to '%s' (%zd of %zd)\n",
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dst, writeCount, readCount);
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return -1;
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}
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}
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if (readCount < (ssize_t) sizeof(buf))
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break;
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}
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return 0;
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}
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/*
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* Set the permissions, owner, and timestamps on the destination file
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* equal to those of the source file.
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*
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* Failures here are "soft"; they don't produce warning messages and don't
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* cause the cp command to report a failure.
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*/
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static int setPermissions(const char* dst, const struct stat* pSrcStat, unsigned int options)
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{
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struct utimbuf ut;
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if (options & COPY_TIMESTAMPS) {
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/*
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* Start with timestamps. The access and mod dates are not affected
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* by the next operations.
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*/
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ut.actime = pSrcStat->st_atime;
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ut.modtime = pSrcStat->st_mtime;
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if (isHiresMtime(pSrcStat))
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ut.modtime += 1;
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if (utime(dst, &ut) != 0) {
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DBUG(("--- unable to set timestamps on '%s': %s\n",
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dst, strerror(errno)));
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}
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}
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if (options & COPY_PERMISSIONS) {
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/*
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* Set the permissions.
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*/
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if (chmod(dst, pSrcStat->st_mode & ~(S_IFMT)) != 0) {
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DBUG(("--- unable to set perms on '%s' to 0%o: %s\n",
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dst, pSrcStat->st_mode & ~(S_IFMT), strerror(errno)));
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}
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#ifndef HAVE_MS_C_RUNTIME
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/*
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* Set the owner.
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*/
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if (chown(dst, pSrcStat->st_uid, pSrcStat->st_gid) != 0) {
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DBUG(("--- unable to set owner of '%s' to %d/%d: %s\n",
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dst, pSrcStat->st_uid, pSrcStat->st_gid, strerror(errno)));
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}
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#endif
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}
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return 0;
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}
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/*
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* Copy a regular file. If the destination file exists and is not a
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* regular file, we fail. However, we use stat() rather than lstat(),
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* because it's okay to write through a symlink (the noDereference stuff
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* only applies to the source file).
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*
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* If the file doesn't exist, create it. If it does exist, truncate it.
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*/
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static int copyRegular(const char* src, const char* dst, const struct stat* pSrcStat, unsigned int options)
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{
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struct stat dstStat;
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int srcFd, dstFd, statResult, copyResult;
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DBUG(("--- copying regular '%s' to '%s'\n", src, dst));
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statResult = stat(dst, &dstStat);
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if (statResult == 0 && !S_ISREG(dstStat.st_mode)) {
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fprintf(stderr,
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"acp: destination '%s' exists and is not regular file\n",
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dst);
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return -1;
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} else if (statResult != 0 && errno != ENOENT) {
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fprintf(stderr, "acp: unable to stat destination '%s'\n", dst);
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return -1;
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}
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if (statResult == 0) {
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if (isSameFile(pSrcStat, &dstStat)) {
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fprintf(stderr, "acp: '%s' and '%s' are the same file\n",
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src, dst);
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return -1;
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}
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if (options & COPY_UPDATE_ONLY) {
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if (!isSourceNewer(pSrcStat, &dstStat)) {
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DBUG(("--- source is not newer: '%s'\n", src));
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printNotNewerMsg(src, dst, options);
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return 0;
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}
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}
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}
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/* open src */
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srcFd = open(src, O_RDONLY | O_BINARY, 0);
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if (srcFd < 0) {
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fprintf(stderr, "acp: unable to open '%s': %s\n", src, strerror(errno));
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return -1;
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}
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/* open dest with O_CREAT | O_TRUNC */
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DBUG(("--- opening '%s'\n", dst));
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dstFd = open(dst, O_CREAT | O_TRUNC | O_WRONLY | O_BINARY, 0644);
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if (dstFd < 0) {
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if (errno == ENOENT) {
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/* this happens if the target directory doesn't exist */
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fprintf(stderr,
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"acp: cannot create '%s': %s\n", dst, strerror(errno));
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(void) close(srcFd);
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return -1;
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}
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/* if "force" is set, try removing the destination file and retry */
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if (options & COPY_FORCE) {
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if (unlink(dst) != 0) {
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#ifdef HAVE_MS_C_RUNTIME
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/* MSVCRT.DLL unlink will fail with EACCESS if the file is set read-only */
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/* so try to change its mode, and unlink again */
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if (errno == EACCESS) {
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if (chmod(dst, S_IWRITE|S_IREAD) == 0 && unlink(dst) == 0)
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goto Open_File;
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}
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#endif
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fprintf(stderr, "acp: unable to remove '%s': %s\n",
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dst, strerror(errno));
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(void) close(srcFd);
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return -1;
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}
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#ifdef HAVE_MS_C_RUNTIME
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Open_File:
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#endif
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dstFd = open(dst, O_CREAT | O_TRUNC | O_WRONLY | O_BINARY, 0644);
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}
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}
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if (dstFd < 0) {
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fprintf(stderr, "acp: unable to open '%s': %s\n",
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dst, strerror(errno));
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(void) close(srcFd);
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return -1;
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}
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copyResult = copyFileContents(dst, dstFd, src, srcFd);
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(void) close(srcFd);
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(void) close(dstFd);
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if (copyResult != 0)
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return -1;
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#ifdef MACOSX_RSRC
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{
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char* srcRsrcName = NULL;
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char* dstRsrcName = NULL;
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struct stat rsrcStat;
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srcRsrcName = malloc(strlen(src) + 5 + 1);
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strcpy(srcRsrcName, src);
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strcat(srcRsrcName, "/rsrc");
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dstRsrcName = malloc(strlen(dst) + 5 + 1);
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strcpy(dstRsrcName, dst);
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strcat(dstRsrcName, "/rsrc");
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if (stat(srcRsrcName, &rsrcStat) == 0 && rsrcStat.st_size > 0) {
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DBUG(("--- RSRC: %s --> %s\n", srcRsrcName, dstRsrcName));
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srcFd = open(srcRsrcName, O_RDONLY);
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dstFd = open(dstRsrcName, O_TRUNC | O_WRONLY, 0);
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copyResult = -1;
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if (srcFd >= 0 && dstFd >= 0) {
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copyResult = copyFileContents(dstRsrcName, dstFd,
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srcRsrcName, srcFd);
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(void) close(srcFd);
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(void) close(dstFd);
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}
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if (copyResult != 0)
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return -1;
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}
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free(srcRsrcName);
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free(dstRsrcName);
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}
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#endif
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setPermissions(dst, pSrcStat, options);
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printCopyMsg(src, dst, options);
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return 0;
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}
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#ifdef HAVE_SYMLINKS
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/*
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* Copy a symlink. This only happens if we're in "no derefence" mode,
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* in which we copy the links rather than the files that are pointed at.
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*
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* We always discard the destination file. If it's a symlink already,
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* we want to throw it out and replace it. If it's not a symlink, we
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* need to trash it so we can create one.
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*/
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static int copySymlink(const char* src, const char* dst, const struct stat* pSrcStat, unsigned int options)
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{
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struct stat dstStat;
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char linkBuf[PATH_MAX+1];
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int statResult, nameLen;
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assert(options & COPY_NO_DEREFERENCE);
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DBUG(("--- copying symlink '%s' to '%s'\n", src, dst));
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/* NOTE: we use lstat() here */
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statResult = lstat(dst, &dstStat);
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if (statResult == 0 && !S_ISREG(dstStat.st_mode)
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&& !S_ISLNK(dstStat.st_mode)
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)
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{
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fprintf(stderr,
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"acp: destination '%s' exists and is not regular or symlink\n",
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dst);
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return -1;
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}
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if (statResult == 0) {
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if (isSameFile(pSrcStat, &dstStat)) {
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fprintf(stderr, "acp: '%s' and '%s' are the same file\n",
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src, dst);
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return -1;
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}
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if (options & COPY_UPDATE_ONLY) {
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if (!isSourceNewer(pSrcStat, &dstStat)) {
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DBUG(("--- source is not newer: '%s'\n", src));
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printNotNewerMsg(src, dst, options);
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return 0;
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}
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}
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}
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/* extract the symlink contents */
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nameLen = readlink(src, linkBuf, sizeof(linkBuf)-1);
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if (nameLen <= 0) {
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fprintf(stderr, "acp: unable to read symlink '%s': %s\n",
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src, strerror(errno));
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return -1;
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}
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linkBuf[nameLen] = '\0';
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DBUG(("--- creating symlink file '%s' (--> %s)\n", dst, linkBuf));
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if (statResult == 0) {
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DBUG(("--- removing '%s'\n", dst));
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if (unlink(dst) != 0) {
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fprintf(stderr, "acp: unable to remove '%s': %s\n",
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dst, strerror(errno));
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return -1;
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}
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}
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if (symlink(linkBuf, dst) != 0) {
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fprintf(stderr, "acp: unable to create symlink '%s' [%s]: %s\n",
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dst, linkBuf, strerror(errno));
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return -1;
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}
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/*
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* There's no way to set the file date or access permissions, but
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* it is possible to set the owner.
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*/
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if (options & COPY_PERMISSIONS) {
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if (lchown(dst, pSrcStat->st_uid, pSrcStat->st_gid) != 0)
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DBUG(("--- lchown failed: %s\n", strerror(errno)));
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}
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printCopyMsg(src, dst, options);
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return 0;
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}
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#endif /* HAVE_SYMLINKS */
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/*
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* Copy the contents of one directory to another. Both "src" and "dst"
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* must be directories. We will create "dst" if it does not exist.
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*/
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int copyDirectory(const char* src, const char* dst, const struct stat* pSrcStat, unsigned int options)
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{
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int retVal = 0;
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struct stat dstStat;
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DIR* dir;
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int cc, statResult;
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DBUG(("--- copy dir '%s' to '%s'\n", src, dst));
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statResult = stat(dst, &dstStat);
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if (statResult == 0 && !S_ISDIR(dstStat.st_mode)) {
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fprintf(stderr,
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"acp: destination '%s' exists and is not a directory\n", dst);
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return -1;
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} else if (statResult != 0 && errno != ENOENT) {
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fprintf(stderr, "acp: unable to stat destination '%s'\n", dst);
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return -1;
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}
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if (statResult == 0) {
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if (isSameFile(pSrcStat, &dstStat)) {
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fprintf(stderr,
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"acp: cannot copy directory into itself ('%s' and '%s')\n",
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src, dst);
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return -1;
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}
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} else {
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DBUG(("--- creating dir '%s'\n", dst));
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cc = mkdir(dst, 0755);
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if (cc != 0) {
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fprintf(stderr, "acp: unable to create directory '%s': %s\n",
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dst, strerror(errno));
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return -1;
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}
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/* only print on mkdir */
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printCopyMsg(src, dst, options);
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}
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/*
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* Open the directory, and plow through its contents.
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*/
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dir = opendir(src);
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if (dir == NULL) {
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fprintf(stderr, "acp: unable to open directory '%s': %s\n",
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src, strerror(errno));
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return -1;
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}
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while (1) {
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struct dirent* ent;
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char* srcFile;
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char* dstFile;
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int srcLen, dstLen, nameLen;
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ent = readdir(dir);
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if (ent == NULL)
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break;
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if (strcmp(ent->d_name, ".") == 0 ||
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strcmp(ent->d_name, "..") == 0)
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{
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continue;
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}
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nameLen = strlen(ent->d_name);
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srcLen = strlen(src);
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dstLen = strlen(dst);
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srcFile = malloc(srcLen +1 + nameLen +1);
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memcpy(srcFile, src, srcLen);
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srcFile[srcLen] = FSSEP;
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memcpy(srcFile + srcLen+1, ent->d_name, nameLen +1);
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dstFile = malloc(dstLen +1 + nameLen +1);
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memcpy(dstFile, dst, dstLen);
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dstFile[dstLen] = FSSEP;
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memcpy(dstFile + dstLen+1, ent->d_name, nameLen +1);
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if (copyFileRecursive(srcFile, dstFile, false, options) != 0)
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retVal = -1; /* note failure and keep going */
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free(srcFile);
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free(dstFile);
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}
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closedir(dir);
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setPermissions(dst, pSrcStat, options);
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|
|
|
return retVal;
|
|
}
|
|
|
|
/*
|
|
* Do the actual copy. This is called recursively from copyDirectory().
|
|
*
|
|
* "dst" should only be a directory if "src" is also a directory.
|
|
*
|
|
* Returns 0 on success.
|
|
*/
|
|
static int copyFileRecursive(const char* src, const char* dst, bool isCmdLine, unsigned int options)
|
|
{
|
|
char* srcExe = NULL;
|
|
char* dstExe = NULL;
|
|
char* dstDir = NULL;
|
|
struct stat srcStat;
|
|
int retVal = 0;
|
|
int statResult, statErrno;
|
|
|
|
/*
|
|
* Stat the source file. If it doesn't exist, fail.
|
|
*/
|
|
if (options & COPY_NO_DEREFERENCE)
|
|
statResult = lstat(src, &srcStat);
|
|
else
|
|
statResult = stat(src, &srcStat);
|
|
statErrno = errno; /* preserve across .exe attempt */
|
|
|
|
#ifdef WIN32_EXE
|
|
/*
|
|
* Here's the interesting part. Under Cygwin, if you have a file
|
|
* called "foo.exe", stat("foo", ...) will succeed, but open("foo", ...)
|
|
* will fail. We need to figure out what its name is supposed to be
|
|
* so we can create the correct destination file.
|
|
*
|
|
* If we don't have the "-e" flag set, we want "acp foo bar" to fail,
|
|
* not automatically find "foo.exe". That way, if we really were
|
|
* trying to copy "foo", it doesn't grab something we don't want.
|
|
*/
|
|
if (isCmdLine && statResult == 0) {
|
|
int tmpFd;
|
|
tmpFd = open(src, O_RDONLY | O_BINARY, 0);
|
|
if (tmpFd < 0) {
|
|
statResult = -1;
|
|
statErrno = ENOENT;
|
|
} else {
|
|
(void) close(tmpFd);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* If we didn't find the file, try it again with ".exe".
|
|
*/
|
|
if (isCmdLine && statResult < 0 && statErrno == ENOENT && (options & COPY_TRY_EXE)) {
|
|
srcExe = malloc(strlen(src) + 4 +1);
|
|
strcpy(srcExe, src);
|
|
strcat(srcExe, ".exe");
|
|
|
|
if (options & COPY_NO_DEREFERENCE)
|
|
statResult = lstat(srcExe, &srcStat);
|
|
else
|
|
statResult = stat(srcExe, &srcStat);
|
|
|
|
if (statResult == 0 && !S_ISREG(srcStat.st_mode))
|
|
statResult = -1; /* fail, use original statErrno below */
|
|
|
|
if (statResult == 0) {
|
|
/* found a .exe, copy that instead */
|
|
dstExe = malloc(strlen(dst) + 4 +1);
|
|
strcpy(dstExe, dst);
|
|
strcat(dstExe, ".exe");
|
|
|
|
src = srcExe;
|
|
dst = dstExe;
|
|
} else {
|
|
DBUG(("--- couldn't find '%s' either\n", srcExe));
|
|
}
|
|
}
|
|
#endif
|
|
if (statResult < 0) {
|
|
if (statErrno == ENOENT)
|
|
fprintf(stderr, "acp: file '%s' does not exist\n", src);
|
|
else
|
|
fprintf(stderr, "acp: unable to stat '%s': %s\n",
|
|
src, strerror(statErrno));
|
|
retVal = -1;
|
|
goto bail;
|
|
}
|
|
|
|
/*
|
|
* If "src" is a directory, ignore it if "recursive" isn't set.
|
|
*
|
|
* We want to create "dst" as a directory (or verify that it already
|
|
* exists as a directory), and then copy its contents.
|
|
*/
|
|
if (S_ISDIR(srcStat.st_mode)) {
|
|
if (!(options & COPY_RECURSIVE)) {
|
|
fprintf(stderr, "acp: omitting directory '%s'\n", src);
|
|
} else {
|
|
retVal = copyDirectory(src, dst, &srcStat, options);
|
|
}
|
|
#ifdef HAVE_SYMLINKS
|
|
} else if (S_ISLNK(srcStat.st_mode)) {
|
|
retVal = copySymlink(src, dst, &srcStat, options);
|
|
#endif
|
|
} else if (S_ISREG(srcStat.st_mode)) {
|
|
retVal = copyRegular(src, dst, &srcStat, options);
|
|
} else {
|
|
fprintf(stderr, "acp: skipping unusual file '%s' (mode=0%o)\n",
|
|
src, srcStat.st_mode);
|
|
retVal = -1;
|
|
}
|
|
|
|
bail:
|
|
free(srcExe);
|
|
free(dstExe);
|
|
free(dstDir);
|
|
return retVal;
|
|
}
|
|
|
|
int copyFile(const char* src, const char* dst, unsigned int options)
|
|
{
|
|
return copyFileRecursive(src, dst, true, options);
|
|
}
|
|
|
|
|