Add a standalone makedevs application to be used along with

fakeroot to construct target device nodes for filesystems
and utilities (such as tar) that do not currently support
device tables natively.

1 files changed, 479 insertions, 0 deletions

diff --git a/target/makedevs/makedevs.c b/target/makedevs/makedevs.c
new file mode 100644
index 000000000..d2b3a2a74
--- /dev/null
+++ b/target/makedevs/makedevs.c
@@ -0,0 +1,479 @@
+/* vi: set sw=4 ts=4: */
+/*
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License version 2 as
+ *  published by the Free Software Foundation.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU Library General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ */
+
+#define _GNU_SOURCE
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <fcntl.h>
+#include <getopt.h>
+#include <time.h>
+#include <pwd.h>
+#include <grp.h>
+#include <unistd.h>
+#include <errno.h>
+#include <stdarg.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <sys/sysmacros.h>     /* major() and minor() */
+
+
+const char *bb_applet_name;
+
+void bb_verror_msg(const char *s, va_list p)
+{
+	fflush(stdout);
+	fprintf(stderr, "%s: ", bb_applet_name);
+	vfprintf(stderr, s, p);
+}
+
+void bb_error_msg(const char *s, ...)
+{
+	va_list p;
+
+	va_start(p, s);
+	bb_verror_msg(s, p);
+	va_end(p);
+	putc('\n', stderr);
+}
+
+void bb_error_msg_and_die(const char *s, ...)
+{
+	va_list p;
+
+	va_start(p, s);
+	bb_verror_msg(s, p);
+	va_end(p);
+	putc('\n', stderr);
+	exit(1);
+}
+void bb_vperror_msg(const char *s, va_list p)
+{
+	int err=errno;
+	if(s == 0) s = "";
+	bb_verror_msg(s, p);
+	if (*s) s = ": ";
+	fprintf(stderr, "%s%s\n", s, strerror(err));
+}
+
+void bb_perror_msg(const char *s, ...)
+{
+	va_list p;
+
+	va_start(p, s);
+	bb_vperror_msg(s, p);
+	va_end(p);
+}
+
+void bb_perror_msg_and_die(const char *s, ...)
+{
+	va_list p;
+
+	va_start(p, s);
+	bb_vperror_msg(s, p);
+	va_end(p);
+	exit(1);
+}
+
+FILE *bb_xfopen(const char *path, const char *mode)
+{
+	FILE *fp;
+	if ((fp = fopen(path, mode)) == NULL)
+		bb_perror_msg_and_die("%s", path);
+	return fp;
+}
+
+int bb_make_directory (char *path, long mode, int flags)
+{
+	mode_t mask;
+	const char *fail_msg;
+	char *s = path;
+	char c;
+	struct stat st;
+	enum {
+		FILEUTILS_PRESERVE_STATUS = 1,
+		FILEUTILS_DEREFERENCE = 2,
+		FILEUTILS_RECUR = 4,
+		FILEUTILS_FORCE = 8,
+		FILEUTILS_INTERACTIVE = 16
+	};
+
+	mask = umask(0);
+	if (mode == -1) {
+		umask(mask);
+		mode = (S_IXUSR | S_IXGRP | S_IXOTH |
+				S_IWUSR | S_IWGRP | S_IWOTH |
+				S_IRUSR | S_IRGRP | S_IROTH) & ~mask;
+	} else {
+		umask(mask & ~0300);
+	}
+
+	do {
+		c = 0;
+
+		if (flags & FILEUTILS_RECUR) {	/* Get the parent. */
+			/* Bypass leading non-'/'s and then subsequent '/'s. */
+			while (*s) {
+				if (*s == '/') {
+					do {
+						++s;
+					} while (*s == '/');
+					c = *s;		/* Save the current char */
+					*s = 0;		/* and replace it with nul. */
+					break;
+				}
+				++s;
+			}
+		}
+
+		if (mkdir(path, 0777) < 0) {
+			/* If we failed for any other reason than the directory
+			 * already exists, output a diagnostic and return -1.*/
+			if (errno != EEXIST
+				|| !(flags & FILEUTILS_RECUR)
+				|| (stat(path, &st) < 0 || !S_ISDIR(st.st_mode))) {
+				fail_msg = "create";
+				umask(mask);
+				break;
+			}
+			/* Since the directory exists, don't attempt to change
+			 * permissions if it was the full target.  Note that
+			 * this is not an error conditon. */
+			if (!c) {
+				umask(mask);
+				return 0;
+			}
+		}
+
+		if (!c) {
+			/* Done.  If necessary, updated perms on the newly
+			 * created directory.  Failure to update here _is_
+			 * an error.*/
+			umask(mask);
+			if ((mode != -1) && (chmod(path, mode) < 0)){
+				fail_msg = "set permissions of";
+				break;
+			}
+			return 0;
+		}
+
+		/* Remove any inserted nul from the path (recursive mode). */
+		*s = c;
+
+	} while (1);
+
+	bb_perror_msg ("Cannot %s directory `%s'", fail_msg, path);
+	return -1;
+}
+
+const char * const bb_msg_memory_exhausted = "memory exhausted";
+
+void *xmalloc(size_t size)
+{
+	void *ptr = malloc(size);
+	if (ptr == NULL && size != 0)
+		bb_error_msg_and_die(bb_msg_memory_exhausted);
+	return ptr;
+}
+
+void *xcalloc(size_t nmemb, size_t size)
+{
+	void *ptr = calloc(nmemb, size);
+	if (ptr == NULL && nmemb != 0 && size != 0)
+		bb_error_msg_and_die(bb_msg_memory_exhausted);
+	return ptr;
+}
+
+void *xrealloc(void *ptr, size_t size)
+{
+	ptr = realloc(ptr, size);
+	if (ptr == NULL && size != 0)
+		bb_error_msg_and_die(bb_msg_memory_exhausted);
+	return ptr;
+}
+
+char *private_get_line_from_file(FILE *file, int c)
+{
+#define GROWBY (80)		/* how large we will grow strings by */
+
+	int ch;
+	int idx = 0;
+	char *linebuf = NULL;
+	int linebufsz = 0;
+
+	while ((ch = getc(file)) != EOF) {
+		/* grow the line buffer as necessary */
+		if (idx > linebufsz - 2) {
+			linebuf = xrealloc(linebuf, linebufsz += GROWBY);
+		}
+		linebuf[idx++] = (char)ch;
+		if (!ch) return linebuf;
+		if (c<2 && ch == '\n') {
+			if (c) {
+				--idx;
+			}
+			break;
+		}
+	}
+	if (linebuf) {
+		if (ferror(file)) {
+			free(linebuf);
+			return NULL;
+		}
+		linebuf[idx] = 0;
+	}
+	return linebuf;
+}
+
+char *bb_get_chomped_line_from_file(FILE *file)
+{
+	return private_get_line_from_file(file, 1);
+}
+
+long my_getpwnam(const char *name)
+{
+	struct passwd *myuser;
+
+	myuser  = getpwnam(name);
+	if (myuser==NULL)
+		bb_error_msg_and_die("unknown user name: %s", name);
+
+	return myuser->pw_uid;
+}
+
+long my_getgrnam(const char *name)
+{
+	struct group *mygroup;
+
+	mygroup  = getgrnam(name);
+	if (mygroup==NULL)
+		bb_error_msg_and_die("unknown group name: %s", name);
+
+	return (mygroup->gr_gid);
+}
+
+unsigned long get_ug_id(const char *s, long (*my_getxxnam)(const char *))
+{
+	unsigned long r;
+	char *p;
+
+	r = strtoul(s, &p, 10);
+	if (*p || (s == p)) {
+		r = my_getxxnam(s);
+	}
+
+	return r;
+}
+
+char * last_char_is(const char *s, int c)
+{
+	char *sret = (char *)s;
+	if (sret) {
+		sret = strrchr(sret, c);
+		if(sret != NULL && *(sret+1) != 0)
+			sret = NULL;
+	}
+	return sret;
+}
+
+void bb_xasprintf(char **string_ptr, const char *format, ...)
+{
+	va_list p;
+	int r;
+
+	va_start(p, format);
+	r = vasprintf(string_ptr, format, p);
+	va_end(p);
+
+	if (r < 0) {
+		bb_perror_msg_and_die("bb_xasprintf");
+	}
+}
+
+char *concat_path_file(const char *path, const char *filename)
+{
+	char *outbuf;
+	char *lc;
+
+	if (!path)
+		path = "";
+	lc = last_char_is(path, '/');
+	while (*filename == '/')
+		filename++;
+	bb_xasprintf(&outbuf, "%s%s%s", path, (lc==NULL ? "/" : ""), filename);
+
+	return outbuf;
+}
+
+int main(int argc, char **argv)
+{
+	int opt;
+	FILE *table = stdin;
+	char *rootdir = "./";
+	char *line;
+	int ret = EXIT_SUCCESS;
+
+	bb_applet_name = argv[0];
+
+	while ((opt = getopt(argc, argv, "d:r:")) != -1) {
+		switch(opt) {
+		case 'd':
+			table = bb_xfopen(optarg, "r");
+			break;
+		case 'n':
+			rootdir = optarg;
+			break;
+		default:
+			fprintf(stderr, "%s: [-r rootdir] [device_table]\n\n", bb_applet_name);
+			fprintf(stderr, "Creates a batch of special files as specified in a device table.\n");
+			fprintf(stderr, "Device table entries take the form of:\n");
+			fprintf(stderr, "type mode user group major minor start increment count\n\n");
+			fprintf(stderr, "Where name is the file name,  type can be one of:\n");
+			fprintf(stderr, "      f       A regular file\n");
+			fprintf(stderr, "      d       Directory\n");
+			fprintf(stderr, "      c       Character special device file\n");
+			fprintf(stderr, "      b       Block special device file\n");
+			fprintf(stderr, "      p       Fifo (named pipe)\n");
+			fprintf(stderr, "uid is the user id for the target file, gid is the group id for the\n");
+			fprintf(stderr, "target file.  The rest of the entries (major, minor, etc) apply to\n");
+			fprintf(stderr, "to device special files.  A '-' may be used for blank entries.\n\n");
+			fprintf(stderr, "For example:\n");
+            fprintf(stderr, "<name>    <type> <mode> <uid> <gid> <major> <minor> <start> <inc> <count>\n");
+            fprintf(stderr, "/dev         d    755    0    0     -       -       -       -     -\n");
+            fprintf(stderr, "/dev/console c    666    0    0     5       1       -       -     -\n");
+            fprintf(stderr, "/dev/null    c    666    0    0     1       3       0       0     -\n");
+            fprintf(stderr, "/dev/zero    c    666    0    0     1       5       0       0     -\n");
+            fprintf(stderr, "/dev/hda     b    640    0    0     3       0       0       0     -\n");
+            fprintf(stderr, "/dev/hda     b    640    0    0     3       1       1       1     15\n\n");
+            fprintf(stderr, "Will Produce:\n");
+            fprintf(stderr, "/dev\n");
+            fprintf(stderr, "/dev/console\n");
+            fprintf(stderr, "/dev/null\n");
+            fprintf(stderr, "/dev/zero\n");
+            fprintf(stderr, "/dev/hda\n");
+            fprintf(stderr, "/dev/hda[0-15]\n");
+			exit(1);
+		}
+	}
+
+
+	if (chdir(rootdir) == -1) {
+		bb_perror_msg_and_die("Couldnt chdir to %s", rootdir);
+	}
+
+	umask(0);
+
+	while ((line = bb_get_chomped_line_from_file(table))) {
+		char type;
+		unsigned int mode = 0755;
+		unsigned int major = 0;
+		unsigned int minor = 0;
+		unsigned int count = 0;
+		unsigned int increment = 0;
+		unsigned int start = 0;
+		char name[41];
+		char user[41];
+		char group[41];
+		char *full_name;
+		uid_t uid;
+		gid_t gid;
+
+		if ((2 > sscanf(line, "%40s %c %o %40s %40s %u %u %u %u %u", name,
+			&type, &mode, user, group, &major,
+			&minor, &start, &increment, &count)) ||
+			((major | minor | start | count | increment) > 255)) {
+			bb_error_msg("Ignoring invalid line\n%s\n", line);
+			ret = EXIT_FAILURE;
+			continue;
+		}
+		if (name[0] == '#') {
+			continue;
+		}
+		if (group) {
+			gid = get_ug_id(group, my_getgrnam);
+		} else {
+			gid = getgid();
+		}
+		if (user) {
+			uid = get_ug_id(user, my_getpwnam);
+		} else {
+			uid = getuid();
+		}
+		full_name = concat_path_file(rootdir, name);
+
+		if (type == 'd') {
+			bb_make_directory(full_name, mode | S_IFDIR, 0);
+			if (chown(full_name, uid, gid) == -1) {
+				bb_perror_msg("chown failed for %s", full_name);
+				ret = EXIT_FAILURE;
+				goto loop;
+			}
+		} else {
+			dev_t rdev;
+
+			if (type == 'p') {
+				mode |= S_IFIFO;
+			}
+			else if (type == 'c') {
+				mode |= S_IFCHR;
+			}
+			else if (type == 'b') {
+				mode |= S_IFBLK;
+			} else {
+				bb_error_msg("Unsupported file type %c", type);
+				ret = EXIT_FAILURE;
+				goto loop;
+			}
+
+			if (count > 0) {
+				int i;
+				char *full_name_inc;
+
+				full_name_inc = xmalloc(strlen(full_name) + 4);
+				for (i = start; i < count; i++) {
+					sprintf(full_name_inc, "%s%d", full_name, i);
+					rdev = (major << 8) + minor + (i * increment - start);
+					if (mknod(full_name_inc, mode, rdev) == -1) {
+						bb_perror_msg("Couldnt create node %s", full_name_inc);
+						ret = EXIT_FAILURE;
+					}
+					else if (chown(full_name_inc, uid, gid) == -1) {
+						bb_perror_msg("chown failed for %s", full_name_inc);
+						ret = EXIT_FAILURE;
+					}
+				}
+				free(full_name_inc);
+			} else {
+				rdev = (major << 8) + minor;
+				if (mknod(full_name, mode, rdev) == -1) {
+					bb_perror_msg("Couldnt create node %s", full_name);
+					ret = EXIT_FAILURE;
+				}
+				else if (chown(full_name, uid, gid) == -1) {
+					bb_perror_msg("chown failed for %s", full_name);
+					ret = EXIT_FAILURE;
+				}
+			}
+		}
+loop:
+		free(line);
+		free(full_name);
+	}
+	fclose(table);
+
+	return 0;
+}