summaryrefslogtreecommitdiff
path: root/libbb/copy_file.c
diff options
context:
space:
mode:
Diffstat (limited to 'libbb/copy_file.c')
-rw-r--r--libbb/copy_file.c210
1 files changed, 126 insertions, 84 deletions
diff --git a/libbb/copy_file.c b/libbb/copy_file.c
index bd9c9f7..0135831 100644
--- a/libbb/copy_file.c
+++ b/libbb/copy_file.c
@@ -10,31 +10,53 @@
#include "libbb.h"
+static int retry_overwrite(const char *dest, int flags)
+{
+ if (!(flags & (FILEUTILS_FORCE|FILEUTILS_INTERACTIVE))) {
+ fprintf(stderr, "'%s' exists\n", dest);
+ return -1;
+ }
+ if (flags & FILEUTILS_INTERACTIVE) {
+ fprintf(stderr, "%s: overwrite '%s'? ", applet_name, dest);
+ if (!bb_ask_confirmation())
+ return 0; // not allowed to overwrite
+ }
+ if (unlink(dest) < 0) {
+ bb_perror_msg("cannot remove '%s'", dest);
+ return -1; // error
+ }
+ return 1; // ok (to try again)
+}
+
int copy_file(const char *source, const char *dest, int flags)
{
struct stat source_stat;
struct stat dest_stat;
- int dest_exists = 0;
int status = 0;
+ signed char dest_exists = 0;
+ signed char ovr;
- if ((!(flags & FILEUTILS_DEREFERENCE) &&
- lstat(source, &source_stat) < 0) ||
- ((flags & FILEUTILS_DEREFERENCE) &&
- stat(source, &source_stat) < 0)) {
- bb_perror_msg("%s", source);
+#define FLAGS_DEREF (flags & FILEUTILS_DEREFERENCE)
+
+ if ((FLAGS_DEREF ? stat : lstat)(source, &source_stat) < 0) {
+ // This may be a dangling symlink.
+ // Making [sym]links to dangling symlinks works, so...
+ if (flags & (FILEUTILS_MAKE_SOFTLINK|FILEUTILS_MAKE_HARDLINK))
+ goto make_links;
+ bb_perror_msg("cannot stat '%s'", source);
return -1;
}
if (lstat(dest, &dest_stat) < 0) {
if (errno != ENOENT) {
- bb_perror_msg("unable to stat `%s'", dest);
+ bb_perror_msg("cannot stat '%s'", dest);
return -1;
}
} else {
- if (source_stat.st_dev == dest_stat.st_dev &&
- source_stat.st_ino == dest_stat.st_ino)
- {
- bb_error_msg("`%s' and `%s' are the same file", source, dest);
+ if (source_stat.st_dev == dest_stat.st_dev
+ && source_stat.st_ino == dest_stat.st_ino
+ ) {
+ bb_error_msg("'%s' and '%s' are the same file", source, dest);
return -1;
}
dest_exists = 1;
@@ -46,14 +68,14 @@ int copy_file(const char *source, const char *dest, int flags)
mode_t saved_umask = 0;
if (!(flags & FILEUTILS_RECUR)) {
- bb_error_msg("%s: omitting directory", source);
+ bb_error_msg("omitting directory '%s'", source);
return -1;
}
/* Create DEST. */
if (dest_exists) {
if (!S_ISDIR(dest_stat.st_mode)) {
- bb_error_msg("`%s' is not a directory", dest);
+ bb_error_msg("target '%s' is not a directory", dest);
return -1;
}
} else {
@@ -67,7 +89,7 @@ int copy_file(const char *source, const char *dest, int flags)
if (mkdir(dest, mode) < 0) {
umask(saved_umask);
- bb_perror_msg("cannot create directory `%s'", dest);
+ bb_perror_msg("cannot create directory '%s'", dest);
return -1;
}
@@ -75,7 +97,8 @@ int copy_file(const char *source, const char *dest, int flags)
}
/* Recursively copy files in SOURCE. */
- if ((dp = opendir(source)) == NULL) {
+ dp = opendir(source);
+ if (dp == NULL) {
status = -1;
goto preserve_status;
}
@@ -84,7 +107,7 @@ int copy_file(const char *source, const char *dest, int flags)
char *new_source, *new_dest;
new_source = concat_subpath_file(source, d->d_name);
- if(new_source == NULL)
+ if (new_source == NULL)
continue;
new_dest = concat_path_file(dest, d->d_name);
if (copy_file(new_source, new_dest, flags) < 0)
@@ -92,103 +115,119 @@ int copy_file(const char *source, const char *dest, int flags)
free(new_source);
free(new_dest);
}
- /* closedir have only EBADF error, but "dp" not changes */
closedir(dp);
- if (!dest_exists &&
- chmod(dest, source_stat.st_mode & ~saved_umask) < 0) {
- bb_perror_msg("unable to change permissions of `%s'", dest);
+ if (!dest_exists
+ && chmod(dest, source_stat.st_mode & ~saved_umask) < 0
+ ) {
+ bb_perror_msg("cannot change permissions of '%s'", dest);
status = -1;
}
- } else if (S_ISREG(source_stat.st_mode) ||
- (S_ISLNK(source_stat.st_mode) && (flags & FILEUTILS_DEREFERENCE)))
- {
+
+ } else if (flags & (FILEUTILS_MAKE_SOFTLINK|FILEUTILS_MAKE_HARDLINK)) {
+ int (*lf)(const char *oldpath, const char *newpath);
+ make_links:
+ // Hmm... maybe
+ // if (DEREF && MAKE_SOFTLINK) source = realpath(source) ?
+ // (but realpath returns NULL on dangling symlinks...)
+ lf = (flags & FILEUTILS_MAKE_SOFTLINK) ? symlink : link;
+ if (lf(source, dest) < 0) {
+ ovr = retry_overwrite(dest, flags);
+ if (ovr <= 0)
+ return ovr;
+ if (lf(source, dest) < 0) {
+ bb_perror_msg("cannot create link '%s'", dest);
+ return -1;
+ }
+ }
+ return 0;
+
+ } else if (S_ISREG(source_stat.st_mode)
+ // Huh? DEREF uses stat, which never returns links IIRC...
+ || (FLAGS_DEREF && S_ISLNK(source_stat.st_mode))
+ ) {
int src_fd;
int dst_fd;
if (ENABLE_FEATURE_PRESERVE_HARDLINKS) {
char *link_name;
- if (!(flags & FILEUTILS_DEREFERENCE) &&
- is_in_ino_dev_hashtable(&source_stat, &link_name)) {
+ if (!FLAGS_DEREF
+ && is_in_ino_dev_hashtable(&source_stat, &link_name)
+ ) {
if (link(link_name, dest) < 0) {
- bb_perror_msg("unable to link `%s'", dest);
- return -1;
+ ovr = retry_overwrite(dest, flags);
+ if (ovr <= 0)
+ return ovr;
+ if (link(link_name, dest) < 0) {
+ bb_perror_msg("cannot create link '%s'", dest);
+ return -1;
+ }
}
-
return 0;
}
+ // TODO: probably is_in_.. and add_to_...
+ // can be combined: find_or_add_...
add_to_ino_dev_hashtable(&source_stat, dest);
}
+
src_fd = open(source, O_RDONLY);
if (src_fd == -1) {
- bb_perror_msg("unable to open `%s'", source);
- return(-1);
+ bb_perror_msg("cannot open '%s'", source);
+ return -1;
}
- if (dest_exists) {
- if (flags & FILEUTILS_INTERACTIVE) {
- fprintf(stderr, "%s: overwrite `%s'? ", applet_name, dest);
- if (!bb_ask_confirmation()) {
- close (src_fd);
- return 0;
- }
- }
-
- dst_fd = open(dest, O_WRONLY|O_TRUNC);
- if (dst_fd == -1) {
- if (!(flags & FILEUTILS_FORCE)) {
- bb_perror_msg("unable to open `%s'", dest);
- close(src_fd);
- return -1;
- }
-
- if (unlink(dest) < 0) {
- bb_perror_msg("unable to remove `%s'", dest);
- close(src_fd);
- return -1;
- }
-
- goto dest_removed;
+ // POSIX: if exists and -i, ask (w/o -i assume yes).
+ // Then open w/o EXCL.
+ // If open still fails and -f, try unlink, then try open again.
+ // Result: a mess:
+ // If dest is a softlink, we overwrite softlink's destination!
+ // (or fail, if it points to dir/nonexistent location/etc).
+ // This is strange, but POSIX-correct.
+ // coreutils cp has --remove-destination to override this...
+ dst_fd = open(dest, (flags & FILEUTILS_INTERACTIVE)
+ ? O_WRONLY|O_CREAT|O_TRUNC|O_EXCL
+ : O_WRONLY|O_CREAT|O_TRUNC, source_stat.st_mode);
+ if (dst_fd == -1) {
+ // We would not do POSIX insanity. -i asks,
+ // then _unlinks_ the offender. Presto.
+ // Or else we will end up having 3 open()s!
+ ovr = retry_overwrite(dest, flags);
+ if (ovr <= 0) {
+ close(src_fd);
+ return ovr;
}
- } else {
-dest_removed:
- dst_fd = open(dest, O_WRONLY|O_CREAT, source_stat.st_mode);
+ dst_fd = open(dest, O_WRONLY|O_CREAT|O_TRUNC, source_stat.st_mode);
if (dst_fd == -1) {
- bb_perror_msg("unable to open `%s'", dest);
+ bb_perror_msg("cannot open '%s'", dest);
close(src_fd);
- return(-1);
+ return -1;
}
}
if (bb_copyfd_eof(src_fd, dst_fd) == -1)
status = -1;
-
if (close(dst_fd) < 0) {
- bb_perror_msg("unable to close `%s'", dest);
+ bb_perror_msg("cannot close '%s'", dest);
status = -1;
}
-
if (close(src_fd) < 0) {
- bb_perror_msg("unable to close `%s'", source);
+ bb_perror_msg("cannot close '%s'", source);
status = -1;
}
- } else if (S_ISBLK(source_stat.st_mode) || S_ISCHR(source_stat.st_mode) ||
- S_ISSOCK(source_stat.st_mode) || S_ISFIFO(source_stat.st_mode) ||
- S_ISLNK(source_stat.st_mode)) {
+ } else if (S_ISBLK(source_stat.st_mode) || S_ISCHR(source_stat.st_mode)
+ || S_ISSOCK(source_stat.st_mode) || S_ISFIFO(source_stat.st_mode)
+ || S_ISLNK(source_stat.st_mode)
+ ) {
+ // We are lazy here, a bit lax with races...
if (dest_exists) {
- if((flags & FILEUTILS_FORCE) == 0) {
- fprintf(stderr, "`%s' exists\n", dest);
- return -1;
- }
- if(unlink(dest) < 0) {
- bb_perror_msg("unable to remove `%s'", dest);
- return -1;
- }
+ ovr = retry_overwrite(dest, flags);
+ if (ovr <= 0)
+ return ovr;
}
if (S_ISFIFO(source_stat.st_mode)) {
if (mkfifo(dest, source_stat.st_mode) < 0) {
- bb_perror_msg("cannot create fifo `%s'", dest);
+ bb_perror_msg("cannot create fifo '%s'", dest);
return -1;
}
} else if (S_ISLNK(source_stat.st_mode)) {
@@ -196,20 +235,21 @@ dest_removed:
lpath = xreadlink(source);
if (symlink(lpath, dest) < 0) {
- bb_perror_msg("cannot create symlink `%s'", dest);
+ bb_perror_msg("cannot create symlink '%s'", dest);
+ free(lpath);
return -1;
}
free(lpath);
if (flags & FILEUTILS_PRESERVE_STATUS)
if (lchown(dest, source_stat.st_uid, source_stat.st_gid) < 0)
- bb_perror_msg("unable to preserve ownership of `%s'", dest);
+ bb_perror_msg("cannot preserve %s of '%s'", "ownership", dest);
return 0;
} else {
if (mknod(dest, source_stat.st_mode, source_stat.st_rdev) < 0) {
- bb_perror_msg("unable to create `%s'", dest);
+ bb_perror_msg("cannot create '%s'", dest);
return -1;
}
}
@@ -218,22 +258,24 @@ dest_removed:
return -1;
}
-preserve_status:
+ preserve_status:
- if (flags & FILEUTILS_PRESERVE_STATUS) {
+ if (flags & FILEUTILS_PRESERVE_STATUS
+ /* Cannot happen: */
+ /* && !(flags & (FILEUTILS_MAKE_SOFTLINK|FILEUTILS_MAKE_HARDLINK)) */
+ ) {
struct utimbuf times;
- char *msg="unable to preserve %s of `%s'";
times.actime = source_stat.st_atime;
times.modtime = source_stat.st_mtime;
if (utime(dest, &times) < 0)
- bb_perror_msg(msg, "times", dest);
+ bb_perror_msg("cannot preserve %s of '%s'", "times", dest);
if (chown(dest, source_stat.st_uid, source_stat.st_gid) < 0) {
source_stat.st_mode &= ~(S_ISUID | S_ISGID);
- bb_perror_msg(msg, "ownership", dest);
+ bb_perror_msg("cannot preserve %s of '%s'", "ownership", dest);
}
if (chmod(dest, source_stat.st_mode) < 0)
- bb_perror_msg(msg, "permissions", dest);
+ bb_perror_msg("cannot preserve %s of '%s'", "permissions", dest);
}
return status;
generated by cgit v1.1 at 2024-12-28 15:41:13 +0000