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Diffstat (limited to 'archival')
-rw-r--r--archival/tar.c118
1 files changed, 67 insertions, 51 deletions
diff --git a/archival/tar.c b/archival/tar.c
index 0b5720f3b..91232bcf3 100644
--- a/archival/tar.c
+++ b/archival/tar.c
@@ -84,7 +84,6 @@ struct HardLinkInfo {
/* Some info to be carried along when creating a new tarball */
struct TarBallInfo {
- char *fileName; /* File name of the tarball */
int tarFd; /* Open-for-write file descriptor
for the tarball */
struct stat statBuf; /* Stat info for the tarball, letting
@@ -117,18 +116,18 @@ typedef enum TarFileType TarFileType;
/* Might be faster (and bigger) if the dev/ino were stored in numeric order;) */
static void addHardLinkInfo(HardLinkInfo ** hlInfoHeadPtr,
struct stat *statbuf,
- const char *name)
+ const char *fileName)
{
/* Note: hlInfoHeadPtr can never be NULL! */
HardLinkInfo *hlInfo;
- hlInfo = (HardLinkInfo *) xmalloc(sizeof(HardLinkInfo) + strlen(name));
+ hlInfo = xmalloc(sizeof(HardLinkInfo) + strlen(fileName));
hlInfo->next = *hlInfoHeadPtr;
*hlInfoHeadPtr = hlInfo;
hlInfo->dev = statbuf->st_dev;
hlInfo->ino = statbuf->st_ino;
hlInfo->linkCount = statbuf->st_nlink;
- strcpy(hlInfo->name, name);
+ strcpy(hlInfo->name, fileName);
}
static void freeHardLinkInfo(HardLinkInfo ** hlInfoHeadPtr)
@@ -156,7 +155,7 @@ static HardLinkInfo *findHardLinkInfo(HardLinkInfo * hlInfo, struct stat *statbu
break;
hlInfo = hlInfo->next;
}
- return (hlInfo);
+ return hlInfo;
}
/* Put an octal string into the specified buffer.
@@ -193,9 +192,29 @@ static int putOctal(char *cp, int len, long value)
return TRUE;
}
+/* Pad file to TAR_BLOCK_SIZE with zeros */
+static void block_write_zeroes(int fd, size_t size)
+{
+ char zerobuf[TAR_BLOCK_SIZE];
+ memset(zerobuf, 0, size);
+ /* No point in trying to continue on error */
+ if (full_write(fd, zerobuf, size) < 0)
+ bb_perror_msg_and_die("write");
+}
+
+static size_t pad_block_write(int fd, size_t size)
+{
+ size_t rem = (TAR_BLOCK_SIZE - size) & (TAR_BLOCK_SIZE-1);
+ if (rem) {
+ block_write_zeroes(fd, rem);
+ size += rem;
+ }
+ return size;
+}
+
/* Write out a tar header for the specified file/directory/whatever */
static int writeTarHeader(struct TarBallInfo *tbInfo,
- const char *header_name, const char *real_name, struct stat *statbuf)
+ const char *header_name, const char *fileName, struct stat *statbuf)
{
long chksum = 0;
struct TarHeader header;
@@ -225,10 +244,10 @@ static int writeTarHeader(struct TarBallInfo *tbInfo,
strncpy(header.linkname, tbInfo->hlInfo->name,
sizeof(header.linkname));
} else if (S_ISLNK(statbuf->st_mode)) {
- char *lpath = xreadlink(real_name);
+ char *lpath = xreadlink(fileName);
if (!lpath) /* Already printed err msg inside xreadlink() */
- return (FALSE);
+ return FALSE;
header.typeflag = SYMTYPE;
strncpy(header.linkname, lpath, sizeof(header.linkname));
free(lpath);
@@ -253,8 +272,8 @@ static int writeTarHeader(struct TarBallInfo *tbInfo,
header.typeflag = REGTYPE;
putOctal(header.size, sizeof(header.size), statbuf->st_size);
} else {
- bb_error_msg("%s: Unknown file type", real_name);
- return (FALSE);
+ bb_error_msg("%s: unknown file type", fileName);
+ return FALSE;
}
/* Calculate and store the checksum (i.e., the sum of all of the bytes of
@@ -269,16 +288,15 @@ static int writeTarHeader(struct TarBallInfo *tbInfo,
putOctal(header.chksum, 7, chksum);
/* Now write the header out to disk */
- if ((size = full_write(tbInfo->tarFd, (char *) &header,
- sizeof(struct TarHeader))) < 0)
- {
- bb_error_msg(bb_msg_io_error, real_name);
- return (FALSE);
+ size = full_write(tbInfo->tarFd, (char *) &header,
+ sizeof(struct TarHeader));
+ if (size < 0) {
+ bb_error_msg(bb_msg_io_error, fileName);
+ return FALSE;
}
/* Pad the header up to the tar block size */
- for (; size < TAR_BLOCK_SIZE; size++) {
- write(tbInfo->tarFd, "\0", 1);
- }
+ size = pad_block_write(tbInfo->tarFd, size);
+
/* Now do the verbose thing (or not) */
if (tbInfo->verboseFlag) {
@@ -290,7 +308,7 @@ static int writeTarHeader(struct TarBallInfo *tbInfo,
fprintf(vbFd, "%s\n", header.name);
}
- return (TRUE);
+ return TRUE;
}
# ifdef CONFIG_FEATURE_TAR_FROM
@@ -328,11 +346,11 @@ static int writeFileToTarball(const char *fileName, struct stat *statbuf,
int inputFileFd = -1;
/*
- ** Check to see if we are dealing with a hard link.
- ** If so -
- ** Treat the first occurance of a given dev/inode as a file while
- ** treating any additional occurances as hard links. This is done
- ** by adding the file information to the HardLinkInfo linked list.
+ * Check to see if we are dealing with a hard link.
+ * If so -
+ * Treat the first occurance of a given dev/inode as a file while
+ * treating any additional occurances as hard links. This is done
+ * by adding the file information to the HardLinkInfo linked list.
*/
tbInfo->hlInfo = NULL;
if (statbuf->st_nlink > 1) {
@@ -344,7 +362,7 @@ static int writeFileToTarball(const char *fileName, struct stat *statbuf,
/* It is against the rules to archive a socket */
if (S_ISSOCK(statbuf->st_mode)) {
bb_error_msg("%s: socket ignored", fileName);
- return (TRUE);
+ return TRUE;
}
/* It is a bad idea to store the archive we are in the process of creating,
@@ -353,7 +371,7 @@ static int writeFileToTarball(const char *fileName, struct stat *statbuf,
if (tbInfo->statBuf.st_dev == statbuf->st_dev &&
tbInfo->statBuf.st_ino == statbuf->st_ino) {
bb_error_msg("%s: file is the archive; skipping", fileName);
- return (TRUE);
+ return TRUE;
}
header_name = fileName;
@@ -361,7 +379,7 @@ static int writeFileToTarball(const char *fileName, struct stat *statbuf,
static int alreadyWarned = FALSE;
if (alreadyWarned == FALSE) {
- bb_error_msg("Removing leading '/' from member names");
+ bb_error_msg("removing leading '/' from member names");
alreadyWarned = TRUE;
}
header_name++;
@@ -369,7 +387,7 @@ static int writeFileToTarball(const char *fileName, struct stat *statbuf,
if (strlen(fileName) >= NAME_SIZE) {
bb_error_msg(bb_msg_name_longer_than_foo, NAME_SIZE);
- return (TRUE);
+ return TRUE;
}
if (header_name[0] == '\0')
@@ -382,21 +400,20 @@ static int writeFileToTarball(const char *fileName, struct stat *statbuf,
/* Is this a regular file? */
if ((tbInfo->hlInfo == NULL) && (S_ISREG(statbuf->st_mode))) {
-
/* open the file we want to archive, and make sure all is well */
if ((inputFileFd = open(fileName, O_RDONLY)) < 0) {
- bb_perror_msg("%s: Cannot open", fileName);
- return (FALSE);
+ bb_perror_msg("%s: cannot open", fileName);
+ return FALSE;
}
}
/* Add an entry to the tarball */
if (writeTarHeader(tbInfo, header_name, fileName, statbuf) == FALSE) {
- return (FALSE);
+ return FALSE;
}
/* If it was a regular file, write out the body */
- if (inputFileFd >= 0 ) {
+ if (inputFileFd >= 0) {
ssize_t readSize = 0;
/* write the file to the archive */
@@ -404,11 +421,10 @@ static int writeFileToTarball(const char *fileName, struct stat *statbuf,
close(inputFileFd);
/* Pad the file up to the tar block size */
- for (; (readSize % TAR_BLOCK_SIZE) != 0; readSize++)
- write(tbInfo->tarFd, "\0", 1);
+ readSize = pad_block_write(tbInfo->tarFd, readSize);
}
- return (TRUE);
+ return TRUE;
}
static int writeTarFile(const int tar_fd, const int verboseFlag,
@@ -416,9 +432,7 @@ static int writeTarFile(const int tar_fd, const int verboseFlag,
const llist_t *exclude, const int gzip)
{
pid_t gzipPid = 0;
-
int errorFlag = FALSE;
- ssize_t size;
struct TarBallInfo tbInfo;
tbInfo.hlInfoHead = NULL;
@@ -430,7 +444,7 @@ static int writeTarFile(const int tar_fd, const int verboseFlag,
/* Store the stat info for the tarball's file, so
* can avoid including the tarball into itself.... */
if (fstat(tbInfo.tarFd, &tbInfo.statBuf) < 0)
- bb_perror_msg_and_die("Couldnt stat tar file");
+ bb_perror_msg_and_die("cannot stat tar file");
if ((ENABLE_FEATURE_TAR_GZIP || ENABLE_FEATURE_TAR_BZIP2) && gzip) {
int gzipDataPipe[2] = { -1, -1 };
@@ -440,7 +454,7 @@ static int writeTarFile(const int tar_fd, const int verboseFlag,
if (pipe(gzipDataPipe) < 0 || pipe(gzipStatusPipe) < 0)
- bb_perror_msg_and_die("create pipe");
+ bb_perror_msg_and_die("pipe");
signal(SIGPIPE, SIG_IGN); /* we only want EPIPE on errors */
@@ -502,8 +516,8 @@ static int writeTarFile(const int tar_fd, const int verboseFlag,
include = include->link;
}
/* Write two empty blocks to the end of the archive */
- for (size = 0; size < (2 * TAR_BLOCK_SIZE); size++)
- write(tbInfo.tarFd, "\0", 1);
+ block_write_zeroes(tbInfo.tarFd, TAR_BLOCK_SIZE);
+ block_write_zeroes(tbInfo.tarFd, TAR_BLOCK_SIZE);
/* To be pedantically correct, we would check if the tarball
* is smaller than 20 tar blocks, and pad it if it was smaller,
@@ -546,10 +560,10 @@ static llist_t *append_file_list_to_list(llist_t *list)
cur = cur->link;
free(tmp);
while ((line = bb_get_chomped_line_from_file(src_stream)) != NULL) {
- char *filename_ptr = last_char_is(line, '/');
- if (filename_ptr > line)
- *filename_ptr = '\0';
- llist_add_to(&newlist, line);
+ char *filename_ptr = last_char_is(line, '/');
+ if (filename_ptr > line)
+ *filename_ptr = '\0';
+ llist_add_to(&newlist, line);
}
fclose(src_stream);
}
@@ -569,12 +583,13 @@ static char get_header_tar_Z(archive_handle_t *archive_handle)
if (xread_char(archive_handle->src_fd) != 0x1f ||
xread_char(archive_handle->src_fd) != 0x9d)
{
- bb_error_msg_and_die("Invalid magic");
+ bb_error_msg_and_die("invalid magic");
}
archive_handle->src_fd = open_transformer(archive_handle->src_fd, uncompress);
archive_handle->offset = 0;
- while (get_header_tar(archive_handle) == EXIT_SUCCESS);
+ while (get_header_tar(archive_handle) == EXIT_SUCCESS)
+ /* nothing */;
/* Can only do one file at a time */
return(EXIT_FAILURE);
@@ -828,7 +843,7 @@ int tar_main(int argc, char **argv)
tar_handle->src_fd = fileno(tar_stream);
tar_handle->seek = seek_by_char;
} else {
- tar_handle->src_fd = xopen(tar_filename, flags);
+ tar_handle->src_fd = xopen3(tar_filename, flags, 0666);
}
}
@@ -854,14 +869,15 @@ int tar_main(int argc, char **argv)
tar_handle->accept,
tar_handle->reject, zipMode);
} else {
- while (get_header_ptr(tar_handle) == EXIT_SUCCESS);
+ while (get_header_ptr(tar_handle) == EXIT_SUCCESS)
+ /* nothing */;
/* Check that every file that should have been extracted was */
while (tar_handle->accept) {
if (!find_list_entry(tar_handle->reject, tar_handle->accept->data)
&& !find_list_entry(tar_handle->passed, tar_handle->accept->data))
{
- bb_error_msg_and_die("%s: Not found in archive", tar_handle->accept->data);
+ bb_error_msg_and_die("%s: not found in archive", tar_handle->accept->data);
}
tar_handle->accept = tar_handle->accept->link;
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-18 19:48:38 +0000