source: branches/stable/mindi-busybox/util-linux/mdev.c @ 1770

Last change on this file since 1770 was 1770, checked in by Bruno Cornec, 13 years ago
  • Better output for mindi-busybox revision
  • Remove dummy file created on NFS - report from Arnaud Tiger <arnaud.tiger_at_hp.com>
  • strace useful for debug
  • fix new versions for pb (2.0.0 for mindi and 1.7.2 for mindi-busybox)
  • fix build process for mindi-busybox + options used in that version (dd for label-partitions-as-necessary)
  • fix typo in label-partitions-as-necessary which doesn't seem to work
  • Update to busybox 1.7.2
  • perl is now required at restore time to support uuid swap partitions (and will be used for many other thigs

in the future for sure)

  • next mindi version will be 2.0.0 due to all the changes made in it (udev may break working distros)
  • small optimization in mindi on keyboard handling (one single find instead of multiple)
  • better interaction for USB device when launching mindi manually
  • attempt to automatically guess block disk size for ramdisk
  • fix typos in bkphw
  • Fix the remaining problem with UUID support for swap partitions
  • Updates mondoarchive man page for USB support
  • Adds preliminary Hardware support to mindi (Proliant SSSTK)
  • Tries to add udev support also for rhel4
  • Fix UUID support which was still broken.
  • Be conservative in test for the start-nfs script
  • Update config file for mindi-busybox for 1.7.2 migration
  • Try to run around a busybox bug (1.2.2 pb on inexistant links)
  • Add build content for mindi-busybox in pb
  • Remove distributions content for mindi-busybox
  • Fix a warning on inexistant raidtab
  • Solve problem on tmpfs in restore init (Problem of inexistant symlink and busybox)
  • Create MONDO_CACHE and use it everywhere + creation at start
  • Really never try to eject a USB device
  • Fix a issue with &> usage (replaced with 1> and 2>)
  • Adds magic file to depllist in order to have file working + ldd which helps for debugging issues
  • tty modes correct to avoid sh error messages
  • Use ext3 normally and not ext2 instead
  • USB device should be corrected after reading (take 1st part)
  • Adds a mount_USB_here function derived from mount_CDROM_here
  • usb detection place before /dev detection in device name at restore time
  • Fix when restoring from USB: media is asked in interactive mode
  • Adds USB support for mondorestore
  • mount_cdrom => mount_media
  • elilo.efi is now searched throughout /boot/efi and not in a fixed place as there is no standard
  • untar-and-softlink => untar (+ interface change)
  • suppress useless softlinks creation/removal in boot process
  • avoids udevd messages on groups
  • Increase # of disks to 99 as in mindi at restore time (should be a conf file parameter)
  • skip existing big file creation
  • seems to work correctly for USB mindi boot
  • Adds group and tty link to udev conf
  • Always load usb-torage (even 2.6) to initiate USB bus discovery
  • Better printing of messages
  • Attempt to fix a bug in supporting OpenSusE 10.3 kernel for initramfs (mindi may now use multiple regex for kernel initrd detection)
  • Links were not correctly done as non relative for modules in mindi
  • exclusion of modules denied now works
  • Also create modules in their ordinary place, so that classical modprobe works + copy modules.dep
  • Fix bugs for DENY_MODS handling
  • Add device /dev/console for udev
  • ide-generic should now really be excluded
  • Fix a bug in major number for tty
  • If udev then adds modprobe/insmod to rootfs
  • tty0 is also cretaed with udev
  • ide-generic put rather in DENY_MODS
  • udevd remove from deplist s handled in mindi directly
  • better default for mindi when using --usb
  • Handles dynamically linked busybox (in case we want to use it soon ;-)
  • Adds fixed devices to create for udev
  • ide-generic should not be part of the initrd when using libata v2
  • support a dynamically linked udev (case on Ubuntu 7.10 and Mandriva 2008.0 so should be quite generic) This will give incitation to move to dyn. linked binaries in the initrd which will help for other tasks (ia6 4)
  • Improvement in udev support (do not use cl options not available in busybox)
  • Udev in mindi
    • auto creation of the right links at boot time with udev-links.conf(from Mandriva 2008.0)
    • rework startup of udev as current makes kernel crash (from Mandriva 2008.0)
    • add support for 64 bits udev
  • Try to render MyInsmod? silent at boot time
  • Adds udev support (mandatory for newest distributions to avoid remapping of devices in a different way as on the original system)
  • We also need vaft format support for USB boot
  • Adds libusual support (Ubuntu 7.10 needs it for USB)
  • Improve Ubuntu/Debian? keyboard detection and support
  • pbinit adapted to new pb (0.8.10). Filtering of docs done in it
  • Suppress some mondo warnings and errors on USB again
  • Tries to fix lack of files in deb mindi package
  • Verify should now work for USB devices
  • More log/mesages improvement for USB support
  • - Supress g_erase_tmpdir_and_scratchdir
  • Improve some log messages for USB support
  • Try to improve install in mindi to avoid issues with isolinux.cfg not installed vene if in the pkg :-(
  • Improve mindi-busybox build
  • In conformity with pb 0.8.9
  • Add support for Ubuntu 7.10 in build process
  • Add USB Key button to Menu UI (CD streamer removed)
  • Attempt to fix error messages on tmp/scratch files at the end by removing those dir at the latest possible.
  • Fix a bug linked to the size of the -E param which could be used (Arnaud Tiger/René? Ribaud).
  • Integrate ~/.pbrc content into mondorescue.pb (required project-builder >= 0.8.7)
  • Put mondorescue in conformity with new pb filtering rules
  • Add USB support at restore time (no test done yet). New start-usb script PB varibale added where useful
  • Unmounting USB device before removal of temporary scratchdir
  • Stil refining USB copy back to mondo (one command was not executed)
  • No need to have the image subdor in the csratchdir when USB.
  • umount the USB partition before attempting to use it
  • Remove useless copy from mindi to mondo at end of USB handling

(risky merge, we are raising the limits of 2 diverging branches. The status of stable is not completely sure as such. Will need lots of tests, but it's not yet done :-()
(merge -r1692:1769 $SVN_M/branches/2.2.5)

File size: 7.9 KB
Line 
1/* vi: set sw=4 ts=4: */
2/*
3 *
4 * mdev - Mini udev for busybox
5 *
6 * Copyright 2005 Rob Landley <rob@landley.net>
7 * Copyright 2005 Frank Sorenson <frank@tuxrocks.com>
8 *
9 * Licensed under GPL version 2, see file LICENSE in this tarball for details.
10 */
11
12#include "libbb.h"
13#include "xregex.h"
14
15struct globals {
16    int root_major, root_minor;
17};
18#define G (*(struct globals*)&bb_common_bufsiz1)
19#define root_major (G.root_major)
20#define root_minor (G.root_minor)
21
22#define MAX_SYSFS_DEPTH 3 /* prevent infinite loops in /sys symlinks */
23
24/* mknod in /dev based on a path like "/sys/block/hda/hda1" */
25static void make_device(char *path, int delete)
26{
27    const char *device_name;
28    int major, minor, type, len;
29    int mode = 0660;
30    uid_t uid = 0;
31    gid_t gid = 0;
32    char *temp = path + strlen(path);
33    char *command = NULL;
34
35    /* Try to read major/minor string.  Note that the kernel puts \n after
36     * the data, so we don't need to worry about null terminating the string
37     * because sscanf() will stop at the first nondigit, which \n is.  We
38     * also depend on path having writeable space after it. */
39
40    if (!delete) {
41        strcat(path, "/dev");
42        len = open_read_close(path, temp + 1, 64);
43        *temp++ = 0;
44        if (len < 1) return;
45    }
46
47    /* Determine device name, type, major and minor */
48
49    device_name = bb_basename(path);
50    type = path[5]=='c' ? S_IFCHR : S_IFBLK;
51
52    /* If we have a config file, look up permissions for this device */
53
54    if (ENABLE_FEATURE_MDEV_CONF) {
55        char *conf, *pos, *end;
56        int line, fd;
57
58        /* mmap the config file */
59        fd = open("/etc/mdev.conf", O_RDONLY);
60        if (fd < 0)
61            goto end_parse;
62        len = xlseek(fd, 0, SEEK_END);
63        conf = mmap(NULL, len, PROT_READ, MAP_PRIVATE, fd, 0);
64        close(fd);
65        if (!conf)
66            goto end_parse;
67
68        line = 0;
69        /* Loop through lines in mmaped file*/
70        for (pos=conf; pos-conf<len;) {
71            int field;
72            char *end2;
73
74            line++;
75            /* find end of this line */
76            for (end=pos; end-conf<len && *end!='\n'; end++)
77                ;
78
79            /* Three fields: regex, uid:gid, mode */
80            for (field=0; field < (3 + ENABLE_FEATURE_MDEV_EXEC);
81                    field++)
82            {
83                /* Skip whitespace */
84                while (pos<end && isspace(*pos)) pos++;
85                if (pos==end || *pos=='#') break;
86                for (end2=pos;
87                    end2<end && !isspace(*end2) && *end2!='#'; end2++)
88                    ;
89
90                if (field == 0) {
91                    /* Regex to match this device */
92
93                    char *regex = xstrndup(pos, end2-pos);
94                    regex_t match;
95                    regmatch_t off;
96                    int result;
97
98                    /* Is this it? */
99                    xregcomp(&match,regex, REG_EXTENDED);
100                    result = regexec(&match, device_name, 1, &off, 0);
101                    regfree(&match);
102                    free(regex);
103
104                    /* If not this device, skip rest of line */
105                    if (result || off.rm_so
106                            || off.rm_eo != strlen(device_name))
107                        break;
108                }
109                if (field == 1) {
110                    /* uid:gid */
111
112                    char *s, *s2;
113
114                    /* Find : */
115                    for (s=pos; s<end2 && *s!=':'; s++)
116                        ;
117                    if (s == end2) break;
118
119                    /* Parse UID */
120                    uid = strtoul(pos, &s2, 10);
121                    if (s != s2) {
122                        struct passwd *pass;
123                        char *_unam = xstrndup(pos, s-pos);
124                        pass = getpwnam(_unam);
125                        free(_unam);
126                        if (!pass) break;
127                        uid = pass->pw_uid;
128                    }
129                    s++;
130                    /* parse GID */
131                    gid = strtoul(s, &s2, 10);
132                    if (end2 != s2) {
133                        struct group *grp;
134                        char *_grnam = xstrndup(s, end2-s);
135                        grp = getgrnam(_grnam);
136                        free(_grnam);
137                        if (!grp) break;
138                        gid = grp->gr_gid;
139                    }
140                }
141                if (field == 2) {
142                    /* mode */
143
144                    mode = strtoul(pos, &pos, 8);
145                    if (pos != end2) break;
146                }
147                if (ENABLE_FEATURE_MDEV_EXEC && field == 3) {
148                    // Command to run
149                    const char *s = "@$*";
150                    const char *s2;
151                    s2 = strchr(s, *pos++);
152                    if (!s2) {
153                        // Force error
154                        field = 1;
155                        break;
156                    }
157                    if ((s2-s+1) & (1<<delete))
158                        command = xstrndup(pos, end-pos);
159                }
160
161                pos = end2;
162            }
163
164            /* Did everything parse happily? */
165
166            if (field > 2) break;
167            if (field) bb_error_msg_and_die("bad line %d",line);
168
169            /* Next line */
170            pos = ++end;
171        }
172        munmap(conf, len);
173 end_parse: /* nothing */ ;
174    }
175
176    umask(0);
177    if (!delete) {
178        if (sscanf(temp, "%d:%d", &major, &minor) != 2) return;
179        if (mknod(device_name, mode | type, makedev(major, minor)) && errno != EEXIST)
180            bb_perror_msg_and_die("mknod %s", device_name);
181
182        if (major == root_major && minor == root_minor)
183            symlink(device_name, "root");
184
185        if (ENABLE_FEATURE_MDEV_CONF) chown(device_name, uid, gid);
186    }
187    if (command) {
188        /* setenv will leak memory, so use putenv */
189        char *s = xasprintf("MDEV=%s", device_name);
190        putenv(s);
191        if (system(command) == -1)
192            bb_perror_msg_and_die("cannot run %s", command);
193        s[4] = '\0';
194        unsetenv(s);
195        free(s);
196        free(command);
197    }
198    if (delete) unlink(device_name);
199}
200
201/* File callback for /sys/ traversal */
202static int fileAction(const char *fileName, struct stat *statbuf,
203                      void *userData, int depth)
204{
205    size_t len = strlen(fileName) - 4;
206    char *scratch = userData;
207
208    if (strcmp(fileName + len, "/dev"))
209        return FALSE;
210
211    strcpy(scratch, fileName);
212    scratch[len] = 0;
213    make_device(scratch, 0);
214
215    return TRUE;
216}
217
218/* Directory callback for /sys/ traversal */
219static int dirAction(const char *fileName, struct stat *statbuf,
220                      void *userData, int depth)
221{
222    return (depth >= MAX_SYSFS_DEPTH ? SKIP : TRUE);
223}
224
225/* For the full gory details, see linux/Documentation/firmware_class/README
226 *
227 * Firmware loading works like this:
228 * - kernel sets FIRMWARE env var
229 * - userspace checks /lib/firmware/$FIRMWARE
230 * - userspace waits for /sys/$DEVPATH/loading to appear
231 * - userspace writes "1" to /sys/$DEVPATH/loading
232 * - userspace copies /lib/firmware/$FIRMWARE into /sys/$DEVPATH/data
233 * - userspace writes "0" (worked) or "-1" (failed) to /sys/$DEVPATH/loading
234 * - kernel loads firmware into device
235 */
236static void load_firmware(const char *const firmware, const char *const sysfs_path)
237{
238    int cnt;
239    int firmware_fd, loading_fd, data_fd;
240
241    /* check for $FIRMWARE from kernel */
242    /* XXX: dont bother: open(NULL) works same as open("no-such-file")
243     * if (!firmware)
244     *  return;
245     */
246
247    /* check for /lib/firmware/$FIRMWARE */
248    xchdir("/lib/firmware");
249    firmware_fd = xopen(firmware, O_RDONLY);
250
251    /* in case we goto out ... */
252    data_fd = -1;
253
254    /* check for /sys/$DEVPATH/loading ... give 30 seconds to appear */
255    xchdir(sysfs_path);
256    for (cnt = 0; cnt < 30; ++cnt) {
257        loading_fd = open("loading", O_WRONLY);
258        if (loading_fd == -1)
259            sleep(1);
260        else
261            break;
262    }
263    if (loading_fd == -1)
264        goto out;
265
266    /* tell kernel we're loading by `echo 1 > /sys/$DEVPATH/loading` */
267    if (write(loading_fd, "1", 1) != 1)
268        goto out;
269
270    /* load firmware by `cat /lib/firmware/$FIRMWARE > /sys/$DEVPATH/data */
271    data_fd = open("data", O_WRONLY);
272    if (data_fd == -1)
273        goto out;
274    cnt = bb_copyfd_eof(firmware_fd, data_fd);
275
276    /* tell kernel result by `echo [0|-1] > /sys/$DEVPATH/loading` */
277    if (cnt > 0)
278        write(loading_fd, "0", 1);
279    else
280        write(loading_fd, "-1", 2);
281
282 out:
283    if (ENABLE_FEATURE_CLEAN_UP) {
284        close(firmware_fd);
285        close(loading_fd);
286        close(data_fd);
287    }
288}
289
290int mdev_main(int argc, char **argv);
291int mdev_main(int argc, char **argv)
292{
293    char *action;
294    char *env_path;
295    RESERVE_CONFIG_BUFFER(temp,PATH_MAX);
296
297    xchdir("/dev");
298
299    /* Scan */
300
301    if (argc == 2 && !strcmp(argv[1],"-s")) {
302        struct stat st;
303
304        xstat("/", &st);
305        root_major = major(st.st_dev);
306        root_minor = minor(st.st_dev);
307
308        recursive_action("/sys/block",
309            ACTION_RECURSE | ACTION_FOLLOWLINKS,
310            fileAction, dirAction, temp, 0);
311
312        recursive_action("/sys/class",
313            ACTION_RECURSE | ACTION_FOLLOWLINKS,
314            fileAction, dirAction, temp, 0);
315
316    /* Hotplug */
317
318    } else {
319        action = getenv("ACTION");
320        env_path = getenv("DEVPATH");
321        if (!action || !env_path)
322            bb_show_usage();
323
324        sprintf(temp, "/sys%s", env_path);
325        if (!strcmp(action, "remove"))
326            make_device(temp, 1);
327        else if (!strcmp(action, "add")) {
328            make_device(temp, 0);
329
330            if (ENABLE_FEATURE_MDEV_LOAD_FIRMWARE)
331                load_firmware(getenv("FIRMWARE"), temp);
332        }
333    }
334
335    if (ENABLE_FEATURE_CLEAN_UP) RELEASE_CONFIG_BUFFER(temp);
336    return 0;
337}
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