rename archival/libunarchive -> archival/libarchive; move bz/ into it

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 200 insertions, 0 deletions

diff --git a/archival/libarchive/data_extract_all.c b/archival/libarchive/data_extract_all.c
new file mode 100644
index 000000000..1b25c8bd6
--- /dev/null
+++ b/archival/libarchive/data_extract_all.c
@@ -0,0 +1,200 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
+ */
+
+#include "libbb.h"
+#include "archive.h"
+
+void FAST_FUNC data_extract_all(archive_handle_t *archive_handle)
+{
+	file_header_t *file_header = archive_handle->file_header;
+	int dst_fd;
+	int res;
+
+#if ENABLE_FEATURE_TAR_SELINUX
+	char *sctx = archive_handle->tar__next_file_sctx;
+	if (!sctx)
+		sctx = archive_handle->tar__global_sctx;
+	if (sctx) { /* setfscreatecon is 4 syscalls, avoid if possible */
+		setfscreatecon(sctx);
+		free(archive_handle->tar__next_file_sctx);
+		archive_handle->tar__next_file_sctx = NULL;
+	}
+#endif
+
+	if (archive_handle->ah_flags & ARCHIVE_CREATE_LEADING_DIRS) {
+		char *slash = strrchr(file_header->name, '/');
+		if (slash) {
+			*slash = '\0';
+			bb_make_directory(file_header->name, -1, FILEUTILS_RECUR);
+			*slash = '/';
+		}
+	}
+
+	if (archive_handle->ah_flags & ARCHIVE_UNLINK_OLD) {
+		/* Remove the entry if it exists */
+		if (!S_ISDIR(file_header->mode)) {
+			/* Is it hardlink?
+			 * We encode hard links as regular files of size 0 with a symlink */
+			if (S_ISREG(file_header->mode)
+			 && file_header->link_target
+			 && file_header->size == 0
+			) {
+				/* Ugly special case:
+				 * tar cf t.tar hardlink1 hardlink2 hardlink1
+				 * results in this tarball structure:
+				 * hardlink1
+				 * hardlink2 -> hardlink1
+				 * hardlink1 -> hardlink1 <== !!!
+				 */
+				if (strcmp(file_header->link_target, file_header->name) == 0)
+					goto ret;
+			}
+			/* Proceed with deleting */
+			if (unlink(file_header->name) == -1
+			 && errno != ENOENT
+			) {
+				bb_perror_msg_and_die("can't remove old file %s",
+						file_header->name);
+			}
+		}
+	}
+	else if (archive_handle->ah_flags & ARCHIVE_EXTRACT_NEWER) {
+		/* Remove the existing entry if its older than the extracted entry */
+		struct stat existing_sb;
+		if (lstat(file_header->name, &existing_sb) == -1) {
+			if (errno != ENOENT) {
+				bb_perror_msg_and_die("can't stat old file");
+			}
+		}
+		else if (existing_sb.st_mtime >= file_header->mtime) {
+			if (!(archive_handle->ah_flags & ARCHIVE_EXTRACT_QUIET)
+			 && !S_ISDIR(file_header->mode)
+			) {
+				bb_error_msg("%s not created: newer or "
+					"same age file exists", file_header->name);
+			}
+			data_skip(archive_handle);
+			goto ret;
+		}
+		else if ((unlink(file_header->name) == -1) && (errno != EISDIR)) {
+			bb_perror_msg_and_die("can't remove old file %s",
+					file_header->name);
+		}
+	}
+
+	/* Handle hard links separately
+	 * We encode hard links as regular files of size 0 with a symlink */
+	if (S_ISREG(file_header->mode)
+	 && file_header->link_target
+	 && file_header->size == 0
+	) {
+		/* hard link */
+		res = link(file_header->link_target, file_header->name);
+		if ((res == -1) && !(archive_handle->ah_flags & ARCHIVE_EXTRACT_QUIET)) {
+			bb_perror_msg("can't create %slink "
+					"from %s to %s", "hard",
+					file_header->name,
+					file_header->link_target);
+		}
+		/* Hardlinks have no separate mode/ownership, skip chown/chmod */
+		goto ret;
+	}
+
+	/* Create the filesystem entry */
+	switch (file_header->mode & S_IFMT) {
+	case S_IFREG: {
+		/* Regular file */
+		int flags = O_WRONLY | O_CREAT | O_EXCL;
+		if (archive_handle->ah_flags & ARCHIVE_O_TRUNC)
+			flags = O_WRONLY | O_CREAT | O_TRUNC;
+		dst_fd = xopen3(file_header->name,
+			flags,
+			file_header->mode
+			);
+		bb_copyfd_exact_size(archive_handle->src_fd, dst_fd, file_header->size);
+		close(dst_fd);
+		break;
+	}
+	case S_IFDIR:
+		res = mkdir(file_header->name, file_header->mode);
+		if ((res == -1)
+		 && (errno != EISDIR) /* btw, Linux doesn't return this */
+		 && (errno != EEXIST)
+		 && !(archive_handle->ah_flags & ARCHIVE_EXTRACT_QUIET)
+		) {
+			bb_perror_msg("can't make dir %s", file_header->name);
+		}
+		break;
+	case S_IFLNK:
+		/* Symlink */
+//TODO: what if file_header->link_target == NULL (say, corrupted tarball?)
+		res = symlink(file_header->link_target, file_header->name);
+		if ((res == -1)
+		 && !(archive_handle->ah_flags & ARCHIVE_EXTRACT_QUIET)
+		) {
+			bb_perror_msg("can't create %slink "
+				"from %s to %s", "sym",
+				file_header->name,
+				file_header->link_target);
+		}
+		break;
+	case S_IFSOCK:
+	case S_IFBLK:
+	case S_IFCHR:
+	case S_IFIFO:
+		res = mknod(file_header->name, file_header->mode, file_header->device);
+		if ((res == -1)
+		 && !(archive_handle->ah_flags & ARCHIVE_EXTRACT_QUIET)
+		) {
+			bb_perror_msg("can't create node %s", file_header->name);
+		}
+		break;
+	default:
+		bb_error_msg_and_die("unrecognized file type");
+	}
+
+	if (!S_ISLNK(file_header->mode)) {
+		if (!(archive_handle->ah_flags & ARCHIVE_DONT_RESTORE_OWNER)) {
+			uid_t uid = file_header->uid;
+			gid_t gid = file_header->gid;
+#if ENABLE_FEATURE_TAR_UNAME_GNAME
+			if (!(archive_handle->ah_flags & ARCHIVE_NUMERIC_OWNER)) {
+				if (file_header->tar__uname) {
+//TODO: cache last name/id pair?
+					struct passwd *pwd = getpwnam(file_header->tar__uname);
+					if (pwd) uid = pwd->pw_uid;
+				}
+				if (file_header->tar__gname) {
+					struct group *grp = getgrnam(file_header->tar__gname);
+					if (grp) gid = grp->gr_gid;
+				}
+			}
+#endif
+			/* GNU tar 1.15.1 uses chown, not lchown */
+			chown(file_header->name, uid, gid);
+		}
+		/* uclibc has no lchmod, glibc is even stranger -
+		 * it has lchmod which seems to do nothing!
+		 * so we use chmod... */
+		if (!(archive_handle->ah_flags & ARCHIVE_DONT_RESTORE_PERM)) {
+			chmod(file_header->name, file_header->mode);
+		}
+		if (archive_handle->ah_flags & ARCHIVE_RESTORE_DATE) {
+			struct timeval t[2];
+
+			t[1].tv_sec = t[0].tv_sec = file_header->mtime;
+			t[1].tv_usec = t[0].tv_usec = 0;
+			utimes(file_header->name, t);
+		}
+	}
+
+ ret: ;
+#if ENABLE_FEATURE_TAR_SELINUX
+	if (sctx) {
+		/* reset the context after creating an entry */
+		setfscreatecon(NULL);
+	}
+#endif
+}