Add symbolic link support to cp(1).
This commit is contained in:
parent
2ecd4c9086
commit
b1a2817ada
157
utils/cp.cpp
157
utils/cp.cpp
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@ -68,23 +68,29 @@ const int FLAG_VERBOSE = 1 << 1;
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const int FLAG_TARGET_DIR = 1 << 2;
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const int FLAG_TARGET_DIR = 1 << 2;
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const int FLAG_NO_TARGET_DIR = 1 << 3;
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const int FLAG_NO_TARGET_DIR = 1 << 3;
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const int FLAG_UPDATE = 1 << 4;
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const int FLAG_UPDATE = 1 << 4;
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const int FLAG_NO_DEREFERENCE = 1 << 5;
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const int FLAG_DEREFERENCE = 1 << 6;
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enum symbolic_dereference
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const int FLAG_DEREFERENCE_ARGUMENTS = 1 << 7;
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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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bool CopyFileContents(int srcfd, const char* srcpath,
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bool CopyFileContents(int srcfd, const char* srcpath,
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int dstfd, const char* dstpath, int flags);
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int dstfd, const char* dstpath, int flags);
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bool CopyDirectoryContents(int srcfd, const char* srcpath,
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bool CopyDirectoryContents(int srcfd, const char* srcpath,
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int dstfd, const char* dstpath, int flags);
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int dstfd, const char* dstpath, int flags,
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enum symbolic_dereference symbolic_dereference);
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bool CopyToDest(int srcdirfd, const char* srcrel, const char* srcpath,
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bool CopyToDest(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 dstdirfd, const char* dstrel, const char* dstpath,
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int flags);
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int flags, enum symbolic_dereference symbolic_dereference);
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bool CopyIntoDirectory(int srcdirfd, const char* srcrel, const char* srcpath,
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bool CopyIntoDirectory(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 dstdirfd, const char* dstrel, const char* dstpath,
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int flags);
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int flags, enum symbolic_dereference symbolic_dereference);
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bool CopyAmbigious(int srcdirfd, const char* srcrel, const char* srcpath,
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bool CopyAmbigious(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 dstdirfd, const char* dstrel, const char* dstpath,
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int flags);
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int flags, enum symbolic_dereference symbolic_dereference);
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bool CopyFileContents(int srcfd, const char* srcpath,
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bool CopyFileContents(int srcfd, const char* srcpath,
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int dstfd, const char* dstpath, int flags)
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int dstfd, const char* dstpath, int flags)
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@ -152,7 +158,8 @@ bool CopyFileContents(int srcfd, const char* srcpath,
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}
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}
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bool CopyDirectoryContentsInner(DIR* srcdir, const char* srcpath,
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bool CopyDirectoryContentsInner(DIR* srcdir, const char* srcpath,
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DIR* dstdir, const char* dstpath, int flags)
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DIR* dstdir, const char* dstpath, int flags,
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enum symbolic_dereference symbolic_dereference)
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{
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{
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if ( flags & FLAG_VERBOSE )
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if ( flags & FLAG_VERBOSE )
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printf("`%s' -> `%s'\n", srcpath, dstpath);
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printf("`%s' -> `%s'\n", srcpath, dstpath);
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@ -166,7 +173,8 @@ bool CopyDirectoryContentsInner(DIR* srcdir, const char* srcpath,
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char* srcpath_new = AddElemToPath(srcpath, name);
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char* srcpath_new = AddElemToPath(srcpath, name);
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char* dstpath_new = AddElemToPath(dstpath, name);
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char* dstpath_new = AddElemToPath(dstpath, name);
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bool ok = CopyToDest(dirfd(srcdir), name, srcpath_new,
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bool ok = CopyToDest(dirfd(srcdir), name, srcpath_new,
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dirfd(dstdir), name, dstpath_new, flags);
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dirfd(dstdir), name, dstpath_new, flags,
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symbolic_dereference);
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free(srcpath_new);
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free(srcpath_new);
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free(dstpath_new);
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free(dstpath_new);
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if ( !ok )
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if ( !ok )
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@ -176,7 +184,8 @@ bool CopyDirectoryContentsInner(DIR* srcdir, const char* srcpath,
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}
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}
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bool CopyDirectoryContentsOuter(int srcfd, const char* srcpath,
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bool CopyDirectoryContentsOuter(int srcfd, const char* srcpath,
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int dstfd, const char* dstpath, int flags)
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int dstfd, const char* dstpath, int flags,
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enum symbolic_dereference symbolic_dereference)
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{
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{
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struct stat srcst, dstst;
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struct stat srcst, dstst;
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if ( fstat(srcfd, &srcst) < 0 )
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if ( fstat(srcfd, &srcst) < 0 )
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@ -201,14 +210,15 @@ bool CopyDirectoryContentsOuter(int srcfd, const char* srcpath,
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if ( !dstdir )
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if ( !dstdir )
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return error(0, errno, "fdopendir()"), closedir(srcdir), false;
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return error(0, errno, "fdopendir()"), closedir(srcdir), false;
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bool ret = CopyDirectoryContentsInner(srcdir, srcpath, dstdir, dstpath,
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bool ret = CopyDirectoryContentsInner(srcdir, srcpath, dstdir, dstpath,
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flags);
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flags, symbolic_dereference);
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closedir(dstdir);
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closedir(dstdir);
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closedir(srcdir);
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closedir(srcdir);
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return ret;
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return ret;
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}
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}
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bool CopyDirectoryContents(int srcfd, const char* srcpath,
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bool CopyDirectoryContents(int srcfd, const char* srcpath,
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int dstfd, const char* dstpath, int flags)
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int dstfd, const char* dstpath, int flags,
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enum symbolic_dereference symbolic_dereference)
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{
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{
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int srcfd_copy = dup(srcfd);
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int srcfd_copy = dup(srcfd);
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if ( srcfd_copy < 0 )
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if ( srcfd_copy < 0 )
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@ -217,7 +227,8 @@ bool CopyDirectoryContents(int srcfd, const char* srcpath,
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if ( dstfd_copy < 0 )
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if ( dstfd_copy < 0 )
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return error(0, errno, "dup"), close(srcfd_copy), false;
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return error(0, errno, "dup"), close(srcfd_copy), false;
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bool ret = CopyDirectoryContentsOuter(srcfd_copy, srcpath,
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bool ret = CopyDirectoryContentsOuter(srcfd_copy, srcpath,
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dstfd_copy, dstpath, flags);
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dstfd_copy, dstpath, flags,
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symbolic_dereference);
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close(dstfd_copy);
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close(dstfd_copy);
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close(srcfd_copy);
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close(srcfd_copy);
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return ret;
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return ret;
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@ -225,11 +236,14 @@ bool CopyDirectoryContents(int srcfd, const char* srcpath,
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bool CopyToDest(int srcdirfd, const char* srcrel, const char* srcpath,
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bool CopyToDest(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 dstdirfd, const char* dstrel, const char* dstpath,
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int flags)
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int flags, enum symbolic_dereference symbolic_dereference)
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{
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{
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struct stat srcst;
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struct stat srcst;
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bool ret = false;
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bool ret = false;
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int srcfd = openat(srcdirfd, srcrel, O_RDONLY);
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int srcfd_flags = O_RDONLY;
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if ( symbolic_dereference == SYMBOLIC_DEREFERENCE_NONE )
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srcfd_flags |= O_SYMLINK_NOFOLLOW;
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int srcfd = openat(srcdirfd, srcrel, O_RDONLY | srcfd_flags);
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if ( srcfd < 0 )
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if ( srcfd < 0 )
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{
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{
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error(0, errno, "%s", srcpath);
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error(0, errno, "%s", srcpath);
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@ -240,7 +254,74 @@ bool CopyToDest(int srcdirfd, const char* srcrel, const char* srcpath,
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error(0, errno, "stat: %s", srcpath);
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error(0, errno, "stat: %s", srcpath);
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return close(srcfd), false;
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return close(srcfd), false;
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}
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}
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if ( S_ISDIR(srcst.st_mode) )
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if ( symbolic_dereference == SYMBOLIC_DEREFERENCE_ARGUMENTS )
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symbolic_dereference = SYMBOLIC_DEREFERENCE_NONE;
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// TODO: I'm really not satisfied with the atomicity properties in this case.
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if ( S_ISLNK(srcst.st_mode) )
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{
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// TODO: How to handle the update flag in this case?
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struct stat dstst;
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int dstst_ret = fstatat(dstdirfd, dstrel, &dstst, AT_SYMLINK_NOFOLLOW);
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if ( dstst_ret < 0 && errno != ENOENT )
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{
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error(0, errno, "%s", dstpath);
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return close(srcfd), false;
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}
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bool already_is_symlink = false;
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if ( dstst_ret == 0 )
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{
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if ( S_ISLNK(dstst.st_mode) )
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{
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already_is_symlink = true;
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}
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else if ( S_ISDIR(dstst.st_mode) )
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{
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error(0, 0, "cannot overwrite directory `%s' with non-directory",
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dstpath);
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return close(srcfd), false;
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}
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else
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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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}
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else if ( errno != ENOENT )
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{
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error(0, errno, "unlink: %s", dstpath);
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return close(srcfd), false;
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}
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}
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}
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if ( !already_is_symlink )
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{
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if ( symlinkat("", dstdirfd, dstrel) < 0 )
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{
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error(0, errno, "creating symlink: %s", dstpath);
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return close(srcfd), false;
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}
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}
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int dstfd = openat(dstdirfd, dstrel, O_WRONLY | O_SYMLINK_NOFOLLOW);
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if ( dstfd < 0 )
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{
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error(0, errno, "creating and opening symlink: %s", dstpath);
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return close(srcfd), false;
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}
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if ( fstat(dstfd, &dstst) < 0 )
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{
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error(0, errno, "stat of symlink: %s", dstpath);
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return close(dstfd), close(srcfd), false;
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}
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if ( !S_ISLNK(dstst.st_mode) )
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{
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error(0, errno, "unexpectedly not a symlink: %s", dstpath);
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return close(dstfd), close(srcfd), false;
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}
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ret = CopyFileContents(srcfd, srcpath, dstfd, dstpath, flags);
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close(dstfd);
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}
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else if ( S_ISDIR(srcst.st_mode) )
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{
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{
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if ( !(flags & FLAG_RECURSIVE) )
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if ( !(flags & FLAG_RECURSIVE) )
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{
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{
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@ -266,7 +347,8 @@ bool CopyToDest(int srcdirfd, const char* srcrel, const char* srcpath,
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return close(srcfd), false;
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return close(srcfd), false;
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}
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}
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}
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}
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ret = CopyDirectoryContents(srcfd, srcpath, dstfd, dstpath, flags);
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ret = CopyDirectoryContents(srcfd, srcpath, dstfd, dstpath, flags,
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symbolic_dereference);
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close(dstfd);
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close(dstfd);
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}
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}
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else
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else
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@ -296,7 +378,7 @@ bool CopyToDest(int srcdirfd, const char* srcrel, const char* srcpath,
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bool CopyIntoDirectory(int srcdirfd, const char* srcrel, const char* srcpath,
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bool CopyIntoDirectory(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 dstdirfd, const char* dstrel, const char* dstpath,
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int flags)
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int flags, enum symbolic_dereference symbolic_dereference)
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{
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{
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const char* src_basename = BaseName(srcrel);
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const char* src_basename = BaseName(srcrel);
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int dstfd = openat(dstdirfd, dstrel, O_RDONLY | O_DIRECTORY);
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int dstfd = openat(dstdirfd, dstrel, O_RDONLY | O_DIRECTORY);
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@ -307,14 +389,15 @@ bool CopyIntoDirectory(int srcdirfd, const char* srcrel, const char* srcpath,
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}
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}
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char* dstpath_new = AddElemToPath(dstpath, src_basename);
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char* dstpath_new = AddElemToPath(dstpath, src_basename);
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bool ret = CopyToDest(srcdirfd, srcrel, srcpath,
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bool ret = CopyToDest(srcdirfd, srcrel, srcpath,
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dstfd, src_basename, dstpath_new, flags);
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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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free(dstpath_new);
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return ret;
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return ret;
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}
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}
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bool CopyAmbigious(int srcdirfd, const char* srcrel, const char* srcpath,
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bool CopyAmbigious(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 dstdirfd, const char* dstrel, const char* dstpath,
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int flags)
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int flags, enum symbolic_dereference symbolic_dereference)
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{
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{
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struct stat dstst;
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struct stat dstst;
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if ( fstatat(dstdirfd, dstrel, &dstst, 0) < 0 )
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if ( fstatat(dstdirfd, dstrel, &dstst, 0) < 0 )
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@ -328,10 +411,12 @@ bool CopyAmbigious(int srcdirfd, const char* srcrel, const char* srcpath,
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}
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}
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if ( S_ISDIR(dstst.st_mode) )
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if ( S_ISDIR(dstst.st_mode) )
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return CopyIntoDirectory(srcdirfd, srcrel, srcpath,
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return CopyIntoDirectory(srcdirfd, srcrel, srcpath,
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dstdirfd, dstrel, dstpath, flags);
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dstdirfd, dstrel, dstpath,
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flags, symbolic_dereference);
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else
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else
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return CopyToDest(srcdirfd, srcrel, srcpath,
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return CopyToDest(srcdirfd, srcrel, srcpath,
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dstdirfd, dstrel, dstpath, flags);
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dstdirfd, dstrel, dstpath,
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flags, symbolic_dereference);
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}
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}
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void compact_arguments(int* argc, char*** argv)
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void compact_arguments(int* argc, char*** argv)
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@ -373,6 +458,7 @@ int main(int argc, char* argv[])
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int flags = 0;
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int flags = 0;
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const char* target_directory = NULL;
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const char* target_directory = NULL;
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const char* preserve_list = 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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for ( int i = 1; i < argc; i++ )
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{
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{
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const char* arg = argv[i];
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const char* arg = argv[i];
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@ -395,8 +481,8 @@ int main(int argc, char* argv[])
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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 '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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case 's': /* ignored */ break;
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#endif
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#endif
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case 'H': flags |= FLAG_DEREFERENCE_ARGUMENTS; break;
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case 'H': symbolic_dereference = SYMBOLIC_DEREFERENCE_ARGUMENTS; break;
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case 'L': flags |= FLAG_DEREFERENCE; 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':
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case 'R': flags |= FLAG_RECURSIVE; break;
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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 'v': flags |= FLAG_VERBOSE; break;
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@ -422,7 +508,7 @@ int main(int argc, char* argv[])
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case 'T': flags |= FLAG_NO_TARGET_DIR; 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 'u': flags |= FLAG_UPDATE; break;
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case 'p': preserve_list = "mode,ownership,timestamps"; break;
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case 'p': preserve_list = "mode,ownership,timestamps"; break;
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case 'P': flags |= FLAG_NO_DEREFERENCE; break;
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case 'P': symbolic_dereference = SYMBOLIC_DEREFERENCE_NONE; break;
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default:
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default:
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#ifdef CP_PRETEND_TO_BE_INSTALL
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#ifdef CP_PRETEND_TO_BE_INSTALL
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fprintf(stderr, "%s (fake): unknown option, ignoring -- '%c'\n", argv0, c);
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fprintf(stderr, "%s (fake): unknown option, ignoring -- '%c'\n", argv0, c);
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@ -438,7 +524,7 @@ int main(int argc, char* argv[])
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else if ( !strcmp(arg, "--version") )
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else if ( !strcmp(arg, "--version") )
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version(stdout, argv0), exit(0);
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version(stdout, argv0), exit(0);
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else if ( !strcmp(arg, "--dereference") )
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else if ( !strcmp(arg, "--dereference") )
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flags |= FLAG_DEREFERENCE;
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symbolic_dereference = SYMBOLIC_DEREFERENCE_ALWAYS;
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else if ( !strcmp(arg, "--recursive") )
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else if ( !strcmp(arg, "--recursive") )
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flags |= FLAG_RECURSIVE;
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flags |= FLAG_RECURSIVE;
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else if ( !strcmp(arg, "--verbose") )
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else if ( !strcmp(arg, "--verbose") )
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@ -469,7 +555,7 @@ int main(int argc, char* argv[])
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else if ( !strcmp(arg, "--update") )
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else if ( !strcmp(arg, "--update") )
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flags |= FLAG_UPDATE;
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flags |= FLAG_UPDATE;
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else if ( !strcmp(arg, "--no-dereference") )
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else if ( !strcmp(arg, "--no-dereference") )
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flags |= FLAG_NO_DEREFERENCE;
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symbolic_dereference = SYMBOLIC_DEREFERENCE_NONE;
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else
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else
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{
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{
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#ifdef CP_PRETEND_TO_BE_INSTALL
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#ifdef CP_PRETEND_TO_BE_INSTALL
|
||||||
|
@ -485,6 +571,14 @@ int main(int argc, char* argv[])
|
||||||
if ( (flags & FLAG_TARGET_DIR) && (flags & FLAG_NO_TARGET_DIR) )
|
if ( (flags & FLAG_TARGET_DIR) && (flags & FLAG_NO_TARGET_DIR) )
|
||||||
error(1, 0, "cannot combine --target-directory (-t) and --no-target-directory (-T)");
|
error(1, 0, "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.
|
// TODO: Actually preserve.
|
||||||
(void) preserve_list;
|
(void) preserve_list;
|
||||||
|
|
||||||
|
@ -501,7 +595,8 @@ int main(int argc, char* argv[])
|
||||||
const char* dst = argv[2];
|
const char* dst = argv[2];
|
||||||
if ( 3 < argc )
|
if ( 3 < argc )
|
||||||
error(1, 0, "extra operand `%s'", argv[3]);
|
error(1, 0, "extra operand `%s'", argv[3]);
|
||||||
return CopyToDest(AT_FDCWD, src, src, AT_FDCWD, dst, dst, flags) ? 0 : 1;
|
return CopyToDest(AT_FDCWD, src, src, AT_FDCWD, dst, dst, flags,
|
||||||
|
symbolic_dereference) ? 0 : 1;
|
||||||
}
|
}
|
||||||
|
|
||||||
if ( !(flags & FLAG_TARGET_DIR) && argc <= 3 )
|
if ( !(flags & FLAG_TARGET_DIR) && argc <= 3 )
|
||||||
|
@ -512,7 +607,8 @@ int main(int argc, char* argv[])
|
||||||
const char* dst = argv[2];
|
const char* dst = argv[2];
|
||||||
if ( 3 < argc )
|
if ( 3 < argc )
|
||||||
error(1, 0, "extra operand `%s'", argv[3]);
|
error(1, 0, "extra operand `%s'", argv[3]);
|
||||||
return CopyAmbigious(AT_FDCWD, src, src, AT_FDCWD, dst, dst, flags) ? 0 : 1;
|
return CopyAmbigious(AT_FDCWD, src, src, AT_FDCWD, dst, dst, flags,
|
||||||
|
symbolic_dereference) ? 0 : 1;
|
||||||
}
|
}
|
||||||
|
|
||||||
if ( !target_directory )
|
if ( !target_directory )
|
||||||
|
@ -529,7 +625,8 @@ int main(int argc, char* argv[])
|
||||||
{
|
{
|
||||||
const char* src = argv[i];
|
const char* src = argv[i];
|
||||||
const char* dst = target_directory;
|
const char* dst = target_directory;
|
||||||
if ( !CopyIntoDirectory(AT_FDCWD, src, src, AT_FDCWD, dst, dst, flags) )
|
if ( !CopyIntoDirectory(AT_FDCWD, src, src, AT_FDCWD, dst, dst, flags,
|
||||||
|
symbolic_dereference) )
|
||||||
success = false;
|
success = false;
|
||||||
}
|
}
|
||||||
|
|
||||||
|
|
Loading…
Reference in New Issue