mdev.patch

   1 diff -Naur busybox.orig/util-linux/Config.in busybox/util-linux/Config.in
   2 --- busybox.orig/util-linux/Config.in   2008-03-22 09:11:36 +0000
   3 +++ busybox/util-linux/Config.in        2008-03-22 15:25:22 +0000
   4 @@ -321,6 +321,13 @@
   5
   6           For more information, please see docs/mdev.txt
   7
   8 +config FEATURE_MDEV_RENAME_REGEXP
   9 +       bool "Support regular expressions substitutions when renaming device"
  10 +       default n
  11 +       depends on FEATURE_MDEV_RENAME
  12 +       help
  13 +         Add support for regular expressions substitutions when renaming device.
  14 +
  15  config FEATURE_MDEV_EXEC
  16         bool "Support command execution at device addition/removal"
  17         default n
  18 diff -Naur busybox.orig/util-linux/mdev.c busybox/util-linux/mdev.c
  19 --- busybox.orig/util-linux/mdev.c      2008-03-17 18:23:37 +0000
  20 +++ busybox/util-linux/mdev.c   2008-03-22 19:15:10 +0000
  21 @@ -21,6 +21,25 @@
  22
  23  #define MAX_SYSFS_DEPTH 3 /* prevent infinite loops in /sys symlinks */
  24
  25 +#if ENABLE_FEATURE_MDEV_RENAME_REGEXP
  26 +static char *strsubst(const char *s, const char *str, regmatch_t *vals)
  27 +{
  28 +       char *buf = xzalloc(PATH_MAX), *p = buf;
  29 +       while (*s) {
  30 +               if ('%' == *s) {
  31 +                       int i = (*++s-'0');
  32 +                       int n = vals[i].rm_eo-vals[i].rm_so;
  33 +                       strncpy(p, str+vals[i].rm_so, n);
  34 +                       p += n;
  35 +               } else {
  36 +                       *p++ = *s;
  37 +               }
  38 +               s++;
  39 +       }
  40 +       return buf;
  41 +}
  42 +#endif
  43 +
  44  /* mknod in /dev based on a path like "/sys/block/hda/hda1" */
  45  static void make_device(char *path, int delete)
  46  {
  47 @@ -70,6 +89,9 @@
  48
  49                 while ((vline = line = xmalloc_getline(fp)) != NULL) {
  50                         int field;
  51 +#if ENABLE_FEATURE_MDEV_RENAME_REGEXP
  52 +                       regmatch_t off[10];
  53 +#endif
  54
  55                         /* A pristine copy for command execution. */
  56                         char *orig_line;
  57 @@ -98,16 +120,26 @@
  58
  59                                         /* Regex to match this device */
  60                                         regex_t match;
  61 +#if !ENABLE_FEATURE_MDEV_RENAME_REGEXP
  62                                         regmatch_t off;
  63 +#endif
  64                                         int result;
  65
  66                                         /* Is this it? */
  67                                         xregcomp(&match, val, REG_EXTENDED);
  68 +#if ENABLE_FEATURE_MDEV_RENAME_REGEXP
  69 +                                       result = regexec(&match, device_name, 10, off, 0);
  70 +#else
  71                                         result = regexec(&match, device_name, 1, &off, 0);
  72 +#endif
  73                                         regfree(&match);
  74
  75                                         /* If not this device, skip rest of line */
  76 +#if ENABLE_FEATURE_MDEV_RENAME_REGEXP
  77 +                                       if (result || off[0].rm_so || off[0].rm_eo != strlen(device_name))
  78 +#else
  79                                         if (result || off.rm_so || off.rm_eo != strlen(device_name))
  80 +#endif
  81                                                 goto next_line;
  82
  83                                 } else if (field == 1) {
  84 @@ -144,8 +176,14 @@
  85
  86                                         if (*val != '>')
  87                                                 ++field;
  88 -                                       else
  89 +                                       else {
  90 +#if ENABLE_FEATURE_MDEV_RENAME_REGEXP
  91 +                                               // substitute %1..9 with off[1..9], if any
  92 +                                               alias = strsubst(val + 1, device_name, off);
  93 +#else
  94                                                 alias = xstrdup(val + 1);
  95 +#endif
  96 +                                       }
  97
  98                                 }
  99
 100 @@ -209,6 +247,21 @@
 101                                 char *dest;
 102
 103                                 temp = strrchr(alias, '/');
 104 +#if ENABLE_FEATURE_MDEV_RENAME_REGEXP
 105 +                               // directory given ->
 106 +                               if (temp && temp[1] == '\0') {
 107 +                                       // make it
 108 +                                       bb_make_directory(alias, 0755, FILEUTILS_RECUR);
 109 +                                       // compose device new location
 110 +                                       dest = concat_path_file(alias, device_name);
 111 +                               // filename given ->
 112 +                               } else {
 113 +                                       // save it
 114 +                                       dest = xstrdup(alias);
 115 +                                       // create parent directories
 116 +                                       bb_make_directory(dirname(alias), 0755, FILEUTILS_RECUR);
 117 +                               }
 118 +#else
 119                                 if (temp) {
 120                                         if (temp[1] != '\0')
 121                                                 /* given a file name, so rename it */
 122 @@ -217,7 +270,7 @@
 123                                         dest = concat_path_file(alias, device_name);
 124                                 } else
 125                                         dest = alias;
 126 -
 127 +#endif
 128                                 rename(device_name, dest); // TODO: xrename?
 129                                 symlink(dest, device_name);
 130