Commit d875bb1b authored by Greg Kroah-Hartman's avatar Greg Kroah-Hartman

gen_init_cpio: Add the ability to add files to the cpio image.

parent 23850f8d
...@@ -5,10 +5,28 @@ ...@@ -5,10 +5,28 @@
#include <string.h> #include <string.h>
#include <unistd.h> #include <unistd.h>
#include <time.h> #include <time.h>
#include <fcntl.h>
static unsigned int offset; static unsigned int offset;
static unsigned int ino = 721; static unsigned int ino = 721;
static void push_string(const char *name)
{
unsigned int name_len = strlen(name) + 1;
fputs(name, stdout);
putchar(0);
offset += name_len;
}
static void push_pad (void)
{
while (offset & 3) {
putchar(0);
offset++;
}
}
static void push_rest(const char *name) static void push_rest(const char *name)
{ {
unsigned int name_len = strlen(name) + 1; unsigned int name_len = strlen(name) + 1;
...@@ -120,6 +138,78 @@ static void cpio_mknod(const char *name, unsigned int mode, ...@@ -120,6 +138,78 @@ static void cpio_mknod(const char *name, unsigned int mode,
push_rest(name); push_rest(name);
} }
/* Not marked static to keep the compiler quiet, as no one uses this yet... */
void cpio_mkfile(const char *filename, const char *location,
unsigned int mode, uid_t uid, gid_t gid)
{
char s[256];
char *filebuf;
struct stat buf;
int file;
int retval;
int i;
mode |= S_IFREG;
retval = stat (filename, &buf);
if (retval) {
fprintf (stderr, "Filename %s could not be located\n", filename);
goto error;
}
file = open (filename, O_RDONLY);
if (file < 0) {
fprintf (stderr, "Filename %s could not be opened for reading\n", filename);
goto error;
}
filebuf = malloc(buf.st_size);
if (!filebuf) {
fprintf (stderr, "out of memory\n");
goto error_close;
}
retval = read (file, filebuf, buf.st_size);
if (retval < 0) {
fprintf (stderr, "Can not read %s file\n", filename);
goto error_free;
}
sprintf(s,"%s%08X%08X%08lX%08lX%08X%08lX"
"%08X%08X%08X%08X%08X%08X%08X",
"070701", /* magic */
ino++, /* ino */
mode, /* mode */
(long) uid, /* uid */
(long) gid, /* gid */
1, /* nlink */
(long) buf.st_mtime, /* mtime */
(int) buf.st_size, /* filesize */
3, /* major */
1, /* minor */
0, /* rmajor */
0, /* rminor */
strlen(location) + 1, /* namesize */
0); /* chksum */
push_hdr(s);
push_string(location);
push_pad();
for (i = 0; i < buf.st_size; ++i)
fputc(filebuf[i], stdout);
close(file);
free(filebuf);
push_pad();
return;
error_free:
free(filebuf);
error_close:
close(file);
error:
exit(-1);
}
int main (int argc, char *argv[]) int main (int argc, char *argv[])
{ {
cpio_mkdir("/dev", 0700, 0, 0); cpio_mkdir("/dev", 0700, 0, 0);
......
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