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Don't compress or decompress special files unless writing

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to stdout even if --force is used.

--force will still enable compression of symlinks, but only
in case they point to a regular file.

The new way simply seems more reasonable. It matches gzip's
behavior while the old one matched bzip2's behavior.
This commit is contained in:
Lasse Collin 2010-01-13 18:12:40 +02:00
parent cee12aa852
commit 23ac2c44c3
1 changed files with 10 additions and 5 deletions
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15
src/xz/file_io.c
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@ -275,9 +275,14 @@ io_open_src(file_pair *pair)
return false;
}
// Symlinks are not followed unless writing to stdout or --force
// was used.
const bool follow_symlinks = opt_stdout || opt_force;
// We accept only regular files if we are writing the output
// to disk too, and if --force was not given.
const bool reg_files_only = !opt_stdout && !opt_force;
// to disk too. bzip2 allows overriding this with --force but
// gzip and xz don't.
const bool reg_files_only = !opt_stdout;
// Flags for open()
int flags = O_RDONLY | O_BINARY | O_NOCTTY;
@ -293,13 +298,13 @@ io_open_src(file_pair *pair)
#endif
#if defined(O_NOFOLLOW)
if (reg_files_only)
if (!follow_symlinks)
flags |= O_NOFOLLOW;
#elif !defined(TUKLIB_DOSLIKE)
// Some POSIX-like systems lack O_NOFOLLOW (it's not required
// by POSIX). Check for symlinks with a separate lstat() on
// these systems.
if (reg_files_only) {
if (!follow_symlinks) {
struct stat st;
if (lstat(pair->src_name, &st)) {
message_error("%s: %s", pair->src_name,
@ -374,7 +379,7 @@ io_open_src(file_pair *pair)
was_symlink = true;
# else
if (errno == ELOOP && reg_files_only) {
if (errno == ELOOP && !follow_symlinks) {
const int saved_errno = errno;
struct stat st;
if (lstat(pair->src_name, &st) == 0