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-rw-r--r--toys/pending/cpio.c369
1 files changed, 164 insertions, 205 deletions
diff --git a/toys/pending/cpio.c b/toys/pending/cpio.c
index 11ad4ea6..d1fd8a16 100644
--- a/toys/pending/cpio.c
+++ b/toys/pending/cpio.c
@@ -4,33 +4,30 @@
* same license as toybox or as CC0, at your option.
*
* http://refspecs.linuxfoundation.org/LSB_4.1.0/LSB-Core-generic/LSB-Core-generic/cpio.html
+ * and http://pubs.opengroup.org/onlinepubs/7908799/xcu/cpio.html
*
- * http://pubs.opengroup.org/onlinepubs/7908799/xcu/cpio.html
- * (Yes, that's SUSv2, the newer standards removed it around the time RPM
- * and initramfs started heavily using this archive format. Go figure.)
+ * Yes, that's SUSv2, the newer standards removed it around the time RPM
+ * and initramfs started heavily using this archive format.
+ *
+ * Modern cpio expanded header to 110 bytes (first field 6 bytes, rest are 8).
+ * In order: magic ino mode uid gid nlink mtime filesize devmajor devminor
+ * rdevmajor rdevminor namesize check
-USE_CPIO(NEWTOY(cpio, "H:di|o|t|uF:[!iot][!dot][!uot]", TOYFLAG_BIN))
+USE_CPIO(NEWTOY(cpio, "duH:i|t|F:o|v(verbose)[!io][!ot]", TOYFLAG_BIN))
config CPIO
bool "cpio"
default n
help
- usage: cpio {-o|-t|-i[du]} [-H FMT] [-F ARCHIVE]
+ usage: cpio -{o|t|i} [-v] [--verbose] [-F FILE] [ignored: -du -H newc]
copy files into and out of a "newc" format cpio archive
- Actions:
- -o create archive (stdin is a list of files, stdout is an archive)
- -t list files (stdin is an archive, stdout is a list of files)
- -i extract from archive into file system (stdin is an archive)
-
- Extract options:
- -d create leading directories when extracting an archive
- -u always overwrite files (default)
-
- Other options:
- -H FMT archive format (ignored, only newc supported)
- -F ARCHIVE read from or write to ARCHIVE file
+ -F FILE use archive FILE instead of stdin/stdout
+ -i extract from archive into file system (stdin=archive)
+ -o create archive (stdin=list of files, stdout=archive)
+ -t test files (list only, stdin=archive, stdout=list of files)
+ -v verbose (list files during create/extract)
*/
#define FOR_cpio
@@ -39,213 +36,175 @@ config CPIO
GLOBALS(
char *archive;
char *fmt;
-
- int outfd;
)
-// 110 bytes
-struct newc_header {
- char c_magic[6];
- char c_ino[8];
- char c_mode[8];
- char c_uid[8];
- char c_gid[8];
- char c_nlink[8];
- char c_mtime[8];
- char c_filesize[8];
- char c_devmajor[8];
- char c_devminor[8];
- char c_rdevmajor[8];
- char c_rdevminor[8];
- char c_namesize[8];
- char c_check[8];
-};
-
-void write_cpio_member(int fd, char *name, struct stat buf)
+// Read strings, tail padded to 4 byte alignment. Argument "align" is amount
+// by which start of string isn't aligned (usually 0).
+static char *strpad(int fd, unsigned len, unsigned align)
{
- unsigned nlen = strlen(name)+1, error = 0, zero = 0;
- ssize_t llen;
+ char *str;
- if (!S_ISREG(buf.st_mode) && !S_ISLNK(buf.st_mode)) buf.st_size = 0;
- else if (buf.st_size >> 32) {
- perror_msg("skipping >2G file '%s'", name);
- return;
- }
+ align = (align + len) & 3;
+ if (align) len += (4-align);
- llen = sprintf(toybuf,
- "070701%08X%08X%08X%08X%08X%08X%08X%08X%08X%08X%08X%08X%08X",
- (int)(buf.st_ino), buf.st_mode, buf.st_uid, buf.st_gid, (int)buf.st_nlink,
- (int)(buf.st_mtime), (int)(buf.st_size), major(buf.st_dev),
- minor(buf.st_dev), major(buf.st_rdev), minor(buf.st_rdev), nlen, 0);
- xwrite(TT.outfd, toybuf, llen);
- xwrite(TT.outfd, name, nlen);
-
- // NUL Pad header up to 4 multiple bytes.
- llen = (llen + nlen) & 3;
- if (llen) xwrite(TT.outfd, &zero, 4-llen);
-
- // Write out body for symlink or regular file
- llen = buf.st_size;
- if (S_ISLNK(buf.st_mode)) {
- if (readlink(name, toybuf, sizeof(toybuf)-1) == llen)
- xwrite(TT.outfd, toybuf, llen);
- else perror_msg("readlink '%s'", name);
- } else while (llen) {
- nlen = llen > sizeof(toybuf) ? sizeof(toybuf) : llen;
- // If read fails, write anyway (we already wrote size in the header).
- if (nlen != readall(fd, toybuf, nlen))
- if (!error++) perror_msg("bad read from file '%s'", name);
- xwrite(TT.outfd, toybuf, nlen);
- }
- llen = buf.st_size & 3;
- if (nlen) write(TT.outfd, &zero, 4-llen);
-}
+ xreadall(fd, str = xmalloc(len+1), len);
+ str[len]=0; // redundant, in case archive is bad
-// Iterate through a list of files read from stdin. No users need rw.
-void loopfiles_stdin(void)
-{
- char *name = 0;
- size_t size = 0;
-
- for (;;) {
- struct stat st;
- int len, fd;
-
- len = getline(&name, &size, stdin);
- if (!name) break;
- if (name[len-1] == '\n') name[--len] = 0;
- if (lstat(name, &st) || (fd = open(name, O_RDONLY))<0)
- perror_msg("%s", name);
- else {
- write_cpio_member(fd, name, st);
- close(fd);
- }
- }
- free(name);
+ return str;
}
//convert hex to uint; mostly to allow using bits of non-terminated strings
-unsigned int htou(char * hex)
+unsigned x8u(char *hex)
{
- unsigned int ret = 0, i = 0;
-
- for (;(i < 8 && hex[i]);) {
- ret *= 16;
- switch(hex[i]) {
- case '0':
- break;
- case '1':
- case '2':
- case '3':
- case '4':
- case '5':
- case '6':
- case '7':
- case '8':
- case '9':
- ret += hex[i] - '1' + 1;
- break;
- case 'A':
- case 'B':
- case 'C':
- case 'D':
- case 'E':
- case 'F':
- ret += hex[i] - 'A' + 10;
- break;
- }
- i++;
- }
- return ret;
-}
+ unsigned val, inpos = 8, outpos;
+ char pattern[6];
-// Read one cpio record. Returns 0 for last record, 1 for "continue".
-int read_cpio_member(int fd, int how)
-{
- uint32_t nsize, fsize;
- mode_t mode = 0;
- int pad, ofd = 0;
- struct newc_header hdr;
- char *name, *lastdir;
- dev_t dev = 0;
-
- xreadall(fd, &hdr, sizeof(struct newc_header));
- nsize = htou(hdr.c_namesize);
- xreadall(fd, name = xmalloc(nsize), nsize);
- if (!strcmp("TRAILER!!!", name)) return 0;
- fsize = htou(hdr.c_filesize);
- mode += htou(hdr.c_mode);
- pad = 4 - ((nsize + 2) % 4); // 2 == sizeof(struct newc_header) % 4
- if (pad < 4) xreadall(fd, toybuf, pad);
- pad = 4 - (fsize % 4);
-
- if ((toys.optflags&FLAG_d) && (lastdir = strrchr(name, '/')))
- if (mkpathat(AT_FDCWD, name, 0, 2)) perror_msg("mkpath '%s'", name);
-
- if (how & 1) {
- if (S_ISDIR(mode)) ofd = mkdir(name, mode);
- else if (S_ISLNK(mode)) {
- memset(toybuf, 0, sizeof(toybuf));
- if (fsize < sizeof(toybuf)) {
- pad = readall(fd, toybuf, fsize);
- if (pad < fsize) error_exit("short archive");
- pad = 4 - (fsize % 4);
- fsize = 0;
- if (symlink(toybuf, name)) {
- perror_msg("could not write link %s", name);
- toys.exitval |= 1;
- }
- } else {
- perror_msg("link too long: %s", name);
- toys.exitval |= 1;
- }
- } else if (S_ISBLK(mode)||S_ISCHR(mode)||S_ISFIFO(mode)||S_ISSOCK(mode)) {
- dev = makedev(htou(hdr.c_rdevmajor),htou(hdr.c_rdevminor));
- ofd = mknod(name, mode, dev);
- } else ofd = creat(name, mode);
- if (ofd == -1) {
- error_msg("could not create %s", name);
- toys.exitval |= 1;
- }
+ while (*hex == '0') {
+ hex++;
+ if (!--inpos) return 0;
}
- errno = 0;
- if (how & 2) puts(name);
- while (fsize) {
- int i;
- memset(toybuf, 0, sizeof(toybuf));
- i = readall(fd, toybuf, (fsize>sizeof(toybuf)) ? sizeof(toybuf) : fsize);
- if (i < 1) error_exit("archive too short");
- if (ofd > 0) writeall(ofd, toybuf, i);
- fsize -= i;
- }
- if (pad < 4) xreadall(fd, toybuf, pad);
- return 1;
-}
+ // Because scanf gratuitously treats %*X differently than printf does.
+ sprintf(pattern, "%%%dX%%n", inpos);
+ sscanf(hex, pattern, &val, &outpos);
+ if (inpos != outpos) error_exit("bad header");
-void read_cpio_archive(int fd, int how)
-{
- for(;;) if (!read_cpio_member(fd, how)) return;
+ return val;
}
void cpio_main(void)
{
- TT.outfd = 1;
+ int afd;
+ // Subtle bit: FLAG_o is 1 so we can just use it to select stdin/stdout.
+
+ afd = toys.optflags & FLAG_o;
if (TT.archive) {
- if (toys.optflags & (FLAG_i|FLAG_t)) {
- xclose(0);
- xopen(TT.archive, O_RDONLY);
- } else if (toys.optflags & FLAG_o) {
- xclose(1);
- xcreate(TT.archive, O_CREAT|O_WRONLY|O_TRUNC, 0644);
- }
+ int perm = (toys.optflags & FLAG_o) ? O_CREAT|O_WRONLY|O_TRUNC : O_RDONLY;
+
+ afd = xcreate(TT.archive, perm, 0644);
}
- if (toys.optflags & FLAG_t) read_cpio_archive(0, 2);
- else if (toys.optflags & FLAG_i) read_cpio_archive(0, 1);
- else if (toys.optflags & FLAG_o) {
- loopfiles_stdin();
- write(1, "07070100000000000000000000000000000000000000010000000000000000"
- "000000000000000000000000000000000000000B00000000TRAILER!!!\0\0\0", 124);
- } else error_exit("must use one of -iot");
+ // read cpio archive
+
+ if (toys.optflags & (FLAG_i|FLAG_t)) for (;;) {
+ char *name, *tofree, *data;
+ unsigned size, mode;
+ int test = toys.optflags & FLAG_t, err = 0;
+
+ // Read header and name.
+ xreadall(afd, toybuf, 110);
+ tofree = name = strpad(afd, x8u(toybuf+94), 110);
+ if (!strcmp("TRAILER!!!", name)) break;
+
+ // If you want to extract absolute paths, "cd /" and run cpio.
+ while (*name == '/') name++;
+
+ // Align to 4 bytes. Note header is 110 bytes which is 2 bytes over.
+
+ size = x8u(toybuf+54);
+ mode = x8u(toybuf+14);
+
+ if (toys.optflags & (FLAG_t|FLAG_v)) puts(name);
+
+ if (!test && strrchr(name, '/') && mkpathat(AT_FDCWD, name, 0, 2)) {
+ perror_msg("mkpath '%s'", name);
+ test++;
+ }
+
+ // Consume entire record even if it couldn't create file, so we're
+ // properly aligned with next file.
+
+ if (S_ISDIR(mode)) {
+ if (!test) err = mkdir(name, mode);
+ } else if (S_ISLNK(mode)) {
+ data = strpad(afd, size, 0);
+ if (!test) err = symlink(data, name);
+ } else if (S_ISREG(mode)) {
+ int fd;
+
+ // If write fails, we still need to read/discard data to continue with
+ // archive. Since doing so overwrites errno, report error now
+ fd = test ? 0 : open(name, O_CREAT|O_WRONLY|O_TRUNC|O_NOFOLLOW, mode);
+ if (fd < 0) {
+ perror_msg("create %s", name);
+ test++;
+ }
+
+ data = toybuf;
+ while (size) {
+ if (size < sizeof(toybuf)) data = strpad(afd, size, 0);
+ else xreadall(afd, toybuf, sizeof(toybuf));
+ if (!test) xwrite(fd, data, data == toybuf ? sizeof(toybuf) : size);
+ if (data != toybuf) {
+ free(data);
+ break;
+ }
+ size -= sizeof(toybuf);
+ }
+ close(fd);
+ } else if (!test)
+ err = mknod(name, mode, makedev(x8u(toybuf+62), x8u(toybuf+70)));
+
+ if (err<0) perror_msg("create '%s'", name);
+ free(tofree);
+
+ // Output cpio archive
+
+ } else {
+ char *name = 0;
+ size_t size = 0;
+
+ for (;;) {
+ struct stat st;
+ unsigned nlen = strlen(name)+1, error = 0, zero = 0;
+ int len, fd;
+ ssize_t llen;
+
+ len = getline(&name, &size, stdin);
+ if (len<1) break;
+ if (name[len-1] == '\n') name[--len] = 0;
+ if (lstat(name, &st) || (fd = open(name, O_RDONLY))<0) {
+ perror_msg("%s", name);
+ continue;
+ }
+
+ if (!S_ISREG(st.st_mode) && !S_ISLNK(st.st_mode)) st.st_size = 0;
+ if (st.st_size >> 32) perror_msg("skipping >2G file '%s'", name);
+ else {
+ llen = sprintf(toybuf,
+ "070701%08X%08X%08X%08X%08X%08X%08X%08X%08X%08X%08X%08X%08X",
+ (int)st.st_ino, st.st_mode, st.st_uid, st.st_gid, (int)st.st_nlink,
+ (int)st.st_mtime, (int)st.st_size, major(st.st_dev),
+ minor(st.st_dev), major(st.st_rdev), minor(st.st_rdev), nlen, 0);
+ xwrite(afd, toybuf, llen);
+ xwrite(afd, name, nlen);
+
+ // NUL Pad header up to 4 multiple bytes.
+ llen = (llen + nlen) & 3;
+ if (llen) xwrite(afd, &zero, 4-llen);
+
+ // Write out body for symlink or regular file
+ llen = st.st_size;
+ if (S_ISLNK(st.st_mode)) {
+ if (readlink(name, toybuf, sizeof(toybuf)-1) == llen)
+ xwrite(afd, toybuf, llen);
+ else perror_msg("readlink '%s'", name);
+ } else while (llen) {
+ nlen = llen > sizeof(toybuf) ? sizeof(toybuf) : llen;
+ // If read fails, write anyway (already wrote size in header)
+ if (nlen != readall(fd, toybuf, nlen))
+ if (!error++) perror_msg("bad read from file '%s'", name);
+ xwrite(afd, toybuf, nlen);
+ }
+ llen = st.st_size & 3;
+ if (nlen) write(afd, &zero, 4-llen);
+ }
+ close(fd);
+ }
+ free(name);
+
+ xwrite(afd, toybuf,
+ sprintf(toybuf, "070701%040X%056X%08XTRAILER!!!%c%c%c",
+ 1, 0x0b, 0, 0, 0, 0));
+ }
}
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