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3b1ec9fb81
Modify gen_init_cpio so that lines that specify files can contain
what looks like a shell variable that's expanded during processing.
For example:
file /sbin/kinit ${RFS_BASE}/usr/src/klibc/kinit/kinit 0755 0 0
given RFS_BASE is "/some/directory" in the environment
would be expanded to
file /sbin/kinit /some/directory/usr/src/klibc/kinit/kinit 0755 0 0
If several environment variables appear in a line, they are all expanded
with processing happening from left to right.
Undefined variables expand to a null string.
Syntax errors stop processing, letting the existing error handling
show the user offending line.
This patch helps embedded folks who frequently create several
RFS directories and then switch between them as they're tuning
an initramfs.
Signed-off-by: gene.sally@timesys.com
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
593 lines
12 KiB
C
593 lines
12 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <string.h>
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#include <unistd.h>
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#include <time.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <ctype.h>
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#include <limits.h>
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/*
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* Original work by Jeff Garzik
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*
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* External file lists, symlink, pipe and fifo support by Thayne Harbaugh
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* Hard link support by Luciano Rocha
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*/
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#define xstr(s) #s
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#define str(s) xstr(s)
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static unsigned int offset;
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static unsigned int ino = 721;
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struct file_handler {
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const char *type;
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int (*handler)(const char *line);
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};
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static void push_string(const char *name)
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{
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unsigned int name_len = strlen(name) + 1;
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fputs(name, stdout);
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putchar(0);
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offset += name_len;
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}
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static void push_pad (void)
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{
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while (offset & 3) {
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putchar(0);
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offset++;
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}
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}
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static void push_rest(const char *name)
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{
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unsigned int name_len = strlen(name) + 1;
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unsigned int tmp_ofs;
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fputs(name, stdout);
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putchar(0);
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offset += name_len;
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tmp_ofs = name_len + 110;
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while (tmp_ofs & 3) {
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putchar(0);
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offset++;
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tmp_ofs++;
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}
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}
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static void push_hdr(const char *s)
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{
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fputs(s, stdout);
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offset += 110;
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}
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static void cpio_trailer(void)
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{
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char s[256];
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const char name[] = "TRAILER!!!";
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sprintf(s, "%s%08X%08X%08lX%08lX%08X%08lX"
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"%08X%08X%08X%08X%08X%08X%08X",
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"070701", /* magic */
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0, /* ino */
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0, /* mode */
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(long) 0, /* uid */
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(long) 0, /* gid */
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1, /* nlink */
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(long) 0, /* mtime */
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0, /* filesize */
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0, /* major */
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0, /* minor */
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0, /* rmajor */
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0, /* rminor */
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(unsigned)strlen(name)+1, /* namesize */
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0); /* chksum */
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push_hdr(s);
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push_rest(name);
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while (offset % 512) {
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putchar(0);
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offset++;
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}
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}
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static int cpio_mkslink(const char *name, const char *target,
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unsigned int mode, uid_t uid, gid_t gid)
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{
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char s[256];
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time_t mtime = time(NULL);
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sprintf(s,"%s%08X%08X%08lX%08lX%08X%08lX"
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"%08X%08X%08X%08X%08X%08X%08X",
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"070701", /* magic */
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ino++, /* ino */
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S_IFLNK | mode, /* mode */
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(long) uid, /* uid */
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(long) gid, /* gid */
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1, /* nlink */
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(long) mtime, /* mtime */
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(unsigned)strlen(target)+1, /* filesize */
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3, /* major */
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1, /* minor */
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0, /* rmajor */
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0, /* rminor */
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(unsigned)strlen(name) + 1,/* namesize */
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0); /* chksum */
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push_hdr(s);
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push_string(name);
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push_pad();
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push_string(target);
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push_pad();
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return 0;
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}
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static int cpio_mkslink_line(const char *line)
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{
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char name[PATH_MAX + 1];
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char target[PATH_MAX + 1];
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unsigned int mode;
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int uid;
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int gid;
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int rc = -1;
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if (5 != sscanf(line, "%" str(PATH_MAX) "s %" str(PATH_MAX) "s %o %d %d", name, target, &mode, &uid, &gid)) {
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fprintf(stderr, "Unrecognized dir format '%s'", line);
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goto fail;
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}
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rc = cpio_mkslink(name, target, mode, uid, gid);
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fail:
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return rc;
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}
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static int cpio_mkgeneric(const char *name, unsigned int mode,
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uid_t uid, gid_t gid)
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{
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char s[256];
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time_t mtime = time(NULL);
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sprintf(s,"%s%08X%08X%08lX%08lX%08X%08lX"
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"%08X%08X%08X%08X%08X%08X%08X",
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"070701", /* magic */
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ino++, /* ino */
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mode, /* mode */
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(long) uid, /* uid */
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(long) gid, /* gid */
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2, /* nlink */
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(long) mtime, /* mtime */
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0, /* filesize */
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3, /* major */
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1, /* minor */
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0, /* rmajor */
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0, /* rminor */
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(unsigned)strlen(name) + 1,/* namesize */
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0); /* chksum */
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push_hdr(s);
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push_rest(name);
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return 0;
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}
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enum generic_types {
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GT_DIR,
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GT_PIPE,
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GT_SOCK
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};
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struct generic_type {
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const char *type;
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mode_t mode;
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};
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static struct generic_type generic_type_table[] = {
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[GT_DIR] = {
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.type = "dir",
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.mode = S_IFDIR
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},
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[GT_PIPE] = {
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.type = "pipe",
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.mode = S_IFIFO
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},
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[GT_SOCK] = {
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.type = "sock",
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.mode = S_IFSOCK
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}
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};
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static int cpio_mkgeneric_line(const char *line, enum generic_types gt)
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{
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char name[PATH_MAX + 1];
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unsigned int mode;
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int uid;
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int gid;
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int rc = -1;
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if (4 != sscanf(line, "%" str(PATH_MAX) "s %o %d %d", name, &mode, &uid, &gid)) {
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fprintf(stderr, "Unrecognized %s format '%s'",
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line, generic_type_table[gt].type);
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goto fail;
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}
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mode |= generic_type_table[gt].mode;
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rc = cpio_mkgeneric(name, mode, uid, gid);
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fail:
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return rc;
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}
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static int cpio_mkdir_line(const char *line)
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{
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return cpio_mkgeneric_line(line, GT_DIR);
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}
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static int cpio_mkpipe_line(const char *line)
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{
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return cpio_mkgeneric_line(line, GT_PIPE);
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}
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static int cpio_mksock_line(const char *line)
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{
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return cpio_mkgeneric_line(line, GT_SOCK);
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}
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static int cpio_mknod(const char *name, unsigned int mode,
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uid_t uid, gid_t gid, char dev_type,
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unsigned int maj, unsigned int min)
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{
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char s[256];
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time_t mtime = time(NULL);
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if (dev_type == 'b')
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mode |= S_IFBLK;
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else
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mode |= S_IFCHR;
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sprintf(s,"%s%08X%08X%08lX%08lX%08X%08lX"
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"%08X%08X%08X%08X%08X%08X%08X",
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"070701", /* magic */
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ino++, /* ino */
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mode, /* mode */
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(long) uid, /* uid */
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(long) gid, /* gid */
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1, /* nlink */
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(long) mtime, /* mtime */
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0, /* filesize */
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3, /* major */
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1, /* minor */
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maj, /* rmajor */
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min, /* rminor */
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(unsigned)strlen(name) + 1,/* namesize */
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0); /* chksum */
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push_hdr(s);
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push_rest(name);
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return 0;
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}
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static int cpio_mknod_line(const char *line)
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{
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char name[PATH_MAX + 1];
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unsigned int mode;
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int uid;
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int gid;
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char dev_type;
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unsigned int maj;
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unsigned int min;
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int rc = -1;
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if (7 != sscanf(line, "%" str(PATH_MAX) "s %o %d %d %c %u %u",
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name, &mode, &uid, &gid, &dev_type, &maj, &min)) {
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fprintf(stderr, "Unrecognized nod format '%s'", line);
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goto fail;
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}
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rc = cpio_mknod(name, mode, uid, gid, dev_type, maj, min);
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fail:
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return rc;
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}
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static int cpio_mkfile(const char *name, const char *location,
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unsigned int mode, uid_t uid, gid_t gid,
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unsigned int nlinks)
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{
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char s[256];
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char *filebuf = NULL;
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struct stat buf;
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long size;
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int file = -1;
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int retval;
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int rc = -1;
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int namesize;
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int i;
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mode |= S_IFREG;
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retval = stat (location, &buf);
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if (retval) {
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fprintf (stderr, "File %s could not be located\n", location);
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goto error;
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}
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file = open (location, O_RDONLY);
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if (file < 0) {
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fprintf (stderr, "File %s could not be opened for reading\n", location);
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goto error;
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}
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filebuf = malloc(buf.st_size);
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if (!filebuf) {
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fprintf (stderr, "out of memory\n");
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goto error;
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}
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retval = read (file, filebuf, buf.st_size);
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if (retval < 0) {
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fprintf (stderr, "Can not read %s file\n", location);
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goto error;
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}
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size = 0;
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for (i = 1; i <= nlinks; i++) {
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/* data goes on last link */
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if (i == nlinks) size = buf.st_size;
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namesize = strlen(name) + 1;
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sprintf(s,"%s%08X%08X%08lX%08lX%08X%08lX"
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"%08lX%08X%08X%08X%08X%08X%08X",
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"070701", /* magic */
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ino, /* ino */
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mode, /* mode */
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(long) uid, /* uid */
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(long) gid, /* gid */
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nlinks, /* nlink */
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(long) buf.st_mtime, /* mtime */
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size, /* filesize */
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3, /* major */
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1, /* minor */
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0, /* rmajor */
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0, /* rminor */
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namesize, /* namesize */
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0); /* chksum */
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push_hdr(s);
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push_string(name);
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push_pad();
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if (size) {
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fwrite(filebuf, size, 1, stdout);
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offset += size;
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push_pad();
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}
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name += namesize;
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}
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ino++;
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rc = 0;
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error:
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if (filebuf) free(filebuf);
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if (file >= 0) close(file);
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return rc;
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}
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static char *cpio_replace_env(char *new_location)
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{
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char expanded[PATH_MAX + 1];
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char env_var[PATH_MAX + 1];
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char *start;
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char *end;
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for (start = NULL; (start = strstr(new_location, "${")); ) {
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end = strchr(start, '}');
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if (start < end) {
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*env_var = *expanded = '\0';
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strncat(env_var, start + 2, end - start - 2);
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strncat(expanded, new_location, start - new_location);
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strncat(expanded, getenv(env_var), PATH_MAX);
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strncat(expanded, end + 1, PATH_MAX);
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strncpy(new_location, expanded, PATH_MAX);
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} else
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break;
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}
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return new_location;
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}
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static int cpio_mkfile_line(const char *line)
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{
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char name[PATH_MAX + 1];
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char *dname = NULL; /* malloc'ed buffer for hard links */
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char location[PATH_MAX + 1];
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unsigned int mode;
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int uid;
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int gid;
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int nlinks = 1;
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int end = 0, dname_len = 0;
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int rc = -1;
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if (5 > sscanf(line, "%" str(PATH_MAX) "s %" str(PATH_MAX)
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"s %o %d %d %n",
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name, location, &mode, &uid, &gid, &end)) {
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fprintf(stderr, "Unrecognized file format '%s'", line);
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goto fail;
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}
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if (end && isgraph(line[end])) {
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int len;
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int nend;
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dname = malloc(strlen(line));
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if (!dname) {
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fprintf (stderr, "out of memory (%d)\n", dname_len);
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goto fail;
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}
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dname_len = strlen(name) + 1;
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memcpy(dname, name, dname_len);
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do {
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nend = 0;
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if (sscanf(line + end, "%" str(PATH_MAX) "s %n",
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name, &nend) < 1)
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break;
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len = strlen(name) + 1;
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memcpy(dname + dname_len, name, len);
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dname_len += len;
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nlinks++;
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end += nend;
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} while (isgraph(line[end]));
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} else {
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dname = name;
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}
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rc = cpio_mkfile(dname, cpio_replace_env(location),
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mode, uid, gid, nlinks);
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fail:
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if (dname_len) free(dname);
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return rc;
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}
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void usage(const char *prog)
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{
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fprintf(stderr, "Usage:\n"
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"\t%s <cpio_list>\n"
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"\n"
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"<cpio_list> is a file containing newline separated entries that\n"
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"describe the files to be included in the initramfs archive:\n"
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"\n"
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"# a comment\n"
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"file <name> <location> <mode> <uid> <gid> [<hard links>]\n"
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"dir <name> <mode> <uid> <gid>\n"
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"nod <name> <mode> <uid> <gid> <dev_type> <maj> <min>\n"
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"slink <name> <target> <mode> <uid> <gid>\n"
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"pipe <name> <mode> <uid> <gid>\n"
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"sock <name> <mode> <uid> <gid>\n"
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"\n"
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"<name> name of the file/dir/nod/etc in the archive\n"
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"<location> location of the file in the current filesystem\n"
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" expands shell variables quoted with ${}\n"
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"<target> link target\n"
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"<mode> mode/permissions of the file\n"
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"<uid> user id (0=root)\n"
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"<gid> group id (0=root)\n"
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"<dev_type> device type (b=block, c=character)\n"
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"<maj> major number of nod\n"
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"<min> minor number of nod\n"
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"<hard links> space separated list of other links to file\n"
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"\n"
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"example:\n"
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"# A simple initramfs\n"
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"dir /dev 0755 0 0\n"
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"nod /dev/console 0600 0 0 c 5 1\n"
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"dir /root 0700 0 0\n"
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"dir /sbin 0755 0 0\n"
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"file /sbin/kinit /usr/src/klibc/kinit/kinit 0755 0 0\n",
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prog);
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}
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struct file_handler file_handler_table[] = {
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{
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.type = "file",
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.handler = cpio_mkfile_line,
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}, {
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.type = "nod",
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.handler = cpio_mknod_line,
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}, {
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.type = "dir",
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.handler = cpio_mkdir_line,
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}, {
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.type = "slink",
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.handler = cpio_mkslink_line,
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}, {
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.type = "pipe",
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.handler = cpio_mkpipe_line,
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}, {
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.type = "sock",
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.handler = cpio_mksock_line,
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}, {
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.type = NULL,
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.handler = NULL,
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}
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};
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#define LINE_SIZE (2 * PATH_MAX + 50)
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int main (int argc, char *argv[])
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{
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FILE *cpio_list;
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char line[LINE_SIZE];
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char *args, *type;
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int ec = 0;
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int line_nr = 0;
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if (2 != argc) {
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usage(argv[0]);
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exit(1);
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}
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if (!strcmp(argv[1], "-"))
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cpio_list = stdin;
|
|
else if (! (cpio_list = fopen(argv[1], "r"))) {
|
|
fprintf(stderr, "ERROR: unable to open '%s': %s\n\n",
|
|
argv[1], strerror(errno));
|
|
usage(argv[0]);
|
|
exit(1);
|
|
}
|
|
|
|
while (fgets(line, LINE_SIZE, cpio_list)) {
|
|
int type_idx;
|
|
size_t slen = strlen(line);
|
|
|
|
line_nr++;
|
|
|
|
if ('#' == *line) {
|
|
/* comment - skip to next line */
|
|
continue;
|
|
}
|
|
|
|
if (! (type = strtok(line, " \t"))) {
|
|
fprintf(stderr,
|
|
"ERROR: incorrect format, could not locate file type line %d: '%s'\n",
|
|
line_nr, line);
|
|
ec = -1;
|
|
break;
|
|
}
|
|
|
|
if ('\n' == *type) {
|
|
/* a blank line */
|
|
continue;
|
|
}
|
|
|
|
if (slen == strlen(type)) {
|
|
/* must be an empty line */
|
|
continue;
|
|
}
|
|
|
|
if (! (args = strtok(NULL, "\n"))) {
|
|
fprintf(stderr,
|
|
"ERROR: incorrect format, newline required line %d: '%s'\n",
|
|
line_nr, line);
|
|
ec = -1;
|
|
}
|
|
|
|
for (type_idx = 0; file_handler_table[type_idx].type; type_idx++) {
|
|
int rc;
|
|
if (! strcmp(line, file_handler_table[type_idx].type)) {
|
|
if ((rc = file_handler_table[type_idx].handler(args))) {
|
|
ec = rc;
|
|
fprintf(stderr, " line %d\n", line_nr);
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (NULL == file_handler_table[type_idx].type) {
|
|
fprintf(stderr, "unknown file type line %d: '%s'\n",
|
|
line_nr, line);
|
|
}
|
|
}
|
|
if (ec == 0)
|
|
cpio_trailer();
|
|
|
|
exit(ec);
|
|
}
|