mdev: do not complain if mdev.conf does not exist;
use #if to prevent gcc from generating dead code (sadly, it's more ugly this way)
This commit is contained in:
Denis Vlasenko
parent
48a9971bd4
commit
df96df9c7c
@ -60,18 +60,23 @@ matched, then the default of 0:0 660 is used. To set your own default, simply
|
||||
create your own total match like so:
|
||||
.* 1:1 777
|
||||
|
||||
You can rename/relocate device nodes by using the next optional field.
|
||||
<device regex> <uid>:<gid> <octal permissions> [>path]
|
||||
You can rename/move device nodes by using the next optional field.
|
||||
<device regex> <uid>:<gid> <octal permissions> [=path]
|
||||
So if you want to place the device node into a subdirectory, make sure the path
|
||||
has a trailing /. If you want to rename the device node, just place the name.
|
||||
hda 0:3 660 >drives/
|
||||
This will relocate "hda" into the drives/ subdirectory.
|
||||
hdb 0:3 660 >cdrom
|
||||
hda 0:3 660 =drives/
|
||||
This will move "hda" into the drives/ subdirectory.
|
||||
hdb 0:3 660 =cdrom
|
||||
This will rename "hdb" to "cdrom".
|
||||
|
||||
Similarly, ">path" renames/moves the device but it also creates
|
||||
a direct symlink /dev/DEVNAME to the renamed/moved device.
|
||||
|
||||
If you also enable support for executing your own commands, then the file has
|
||||
the format:
|
||||
<device regex> <uid>:<gid> <octal permissions> [<@|$|*> <command>]
|
||||
<device regex> <uid>:<gid> <octal permissions> [=path] [@|$|*<command>]
|
||||
or
|
||||
<device regex> <uid>:<gid> <octal permissions> [>path] [@|$|*<command>]
|
||||
The special characters have the meaning:
|
||||
@ Run after creating the device.
|
||||
$ Run before removing the device.
|
||||
|
||||
@ -29,7 +29,6 @@ testing "mdev add /block/sda" \
|
||||
"env - ACTION=add DEVPATH=/block/sda chroot mdev.testdir /mdev 2>&1;
|
||||
ls -ln mdev.testdir/dev | $FILTER_LS" \
|
||||
"\
|
||||
mdev: /etc/mdev.conf: No such file or directory
|
||||
brw-rw---- 1 0 0 8,0 sda
|
||||
" \
|
||||
"" ""
|
||||
|
||||
@ -25,6 +25,7 @@ struct globals {
|
||||
/* We use additional 64+ bytes in make_device() */
|
||||
#define SCRATCH_SIZE 80
|
||||
|
||||
#if ENABLE_FEATURE_MDEV_RENAME
|
||||
/* Builds an alias path.
|
||||
* This function potentionally reallocates the alias parameter.
|
||||
*/
|
||||
@ -48,6 +49,7 @@ static char *build_alias(char *alias, const char *device_name)
|
||||
|
||||
return alias;
|
||||
}
|
||||
#endif
|
||||
|
||||
/* mknod in /dev based on a path like "/sys/block/hda/hda1" */
|
||||
/* NB: "mdev -s" may call us many times, do not leak memory/fds! */
|
||||
@ -56,12 +58,20 @@ static void make_device(char *path, int delete)
|
||||
const char *device_name;
|
||||
int major, minor, type, len;
|
||||
int mode = 0660;
|
||||
#if ENABLE_FEATURE_MDEV_CONF
|
||||
uid_t uid = 0;
|
||||
gid_t gid = 0;
|
||||
char *dev_maj_min = path + strlen(path);
|
||||
parser_t *parser;
|
||||
char *tokens[5];
|
||||
#endif
|
||||
#if ENABLE_FEATURE_MDEV_EXEC
|
||||
char *command = NULL;
|
||||
#endif
|
||||
#if ENABLE_FEATURE_MDEV_RENAME
|
||||
char *alias = NULL;
|
||||
char aliaslink = aliaslink; /* for compiler */
|
||||
#endif
|
||||
char *dev_maj_min = path + strlen(path);
|
||||
|
||||
/* Force the configuration file settings exactly. */
|
||||
umask(0);
|
||||
@ -93,148 +103,149 @@ static void make_device(char *path, int delete)
|
||||
if (strstr(path, "/block/"))
|
||||
type = S_IFBLK;
|
||||
|
||||
if (ENABLE_FEATURE_MDEV_CONF) {
|
||||
parser_t *parser = config_open("/etc/mdev.conf");
|
||||
char *tokens[5];
|
||||
#if ENABLE_FEATURE_MDEV_CONF
|
||||
parser = config_open2("/etc/mdev.conf", fopen_for_read);
|
||||
|
||||
/* If we have config file, look up user settings */
|
||||
if (!parser)
|
||||
goto end_parse;
|
||||
/* If we have config file, look up user settings */
|
||||
if (!parser)
|
||||
goto end_parse;
|
||||
|
||||
while (config_read(parser, tokens, 4, 3, "# \t", PARSE_LAST_IS_GREEDY)) {
|
||||
regmatch_t off[1+9*ENABLE_FEATURE_MDEV_RENAME_REGEXP];
|
||||
char *val;
|
||||
while (config_read(parser, tokens, 4, 3, "# \t", PARSE_LAST_IS_GREEDY)) {
|
||||
regmatch_t off[1 + 9*ENABLE_FEATURE_MDEV_RENAME_REGEXP];
|
||||
char *val;
|
||||
|
||||
/* Fields: regex uid:gid mode [alias] [cmd] */
|
||||
/* Fields: regex uid:gid mode [alias] [cmd] */
|
||||
|
||||
/* 1st field: regex to match this device */
|
||||
{
|
||||
regex_t match;
|
||||
int result;
|
||||
/* 1st field: regex to match this device */
|
||||
{
|
||||
regex_t match;
|
||||
int result;
|
||||
|
||||
/* Is this it? */
|
||||
xregcomp(&match, tokens[0], REG_EXTENDED);
|
||||
result = regexec(&match, device_name, ARRAY_SIZE(off), off, 0);
|
||||
regfree(&match);
|
||||
/* Is this it? */
|
||||
xregcomp(&match, tokens[0], REG_EXTENDED);
|
||||
result = regexec(&match, device_name, ARRAY_SIZE(off), off, 0);
|
||||
regfree(&match);
|
||||
|
||||
//bb_error_msg("matches:");
|
||||
//for (int i = 0; i < ARRAY_SIZE(off); i++) {
|
||||
// if (off[i].rm_so < 0) continue;
|
||||
// bb_error_msg("match %d: '%.*s'\n", i,
|
||||
// (int)(off[i].rm_eo - off[i].rm_so),
|
||||
// device_name + off[i].rm_so);
|
||||
//}
|
||||
//bb_error_msg("matches:");
|
||||
//for (int i = 0; i < ARRAY_SIZE(off); i++) {
|
||||
// if (off[i].rm_so < 0) continue;
|
||||
// bb_error_msg("match %d: '%.*s'\n", i,
|
||||
// (int)(off[i].rm_eo - off[i].rm_so),
|
||||
// device_name + off[i].rm_so);
|
||||
//}
|
||||
|
||||
/* If not this device, skip rest of line */
|
||||
/* (regexec returns whole pattern as "range" 0) */
|
||||
if (result || off[0].rm_so
|
||||
|| ((int)off[0].rm_eo != (int)strlen(device_name))
|
||||
) {
|
||||
continue;
|
||||
}
|
||||
/* If not this device, skip rest of line */
|
||||
/* (regexec returns whole pattern as "range" 0) */
|
||||
if (result || off[0].rm_so
|
||||
|| ((int)off[0].rm_eo != (int)strlen(device_name))
|
||||
) {
|
||||
continue;
|
||||
}
|
||||
}
|
||||
|
||||
/* This line matches: stop parsing the file
|
||||
* after parsing the rest of fields */
|
||||
/* This line matches: stop parsing the file
|
||||
* after parsing the rest of fields */
|
||||
|
||||
/* 2nd field: uid:gid - device ownership */
|
||||
{
|
||||
struct passwd *pass;
|
||||
struct group *grp;
|
||||
char *str_uid = tokens[1];
|
||||
char *str_gid = strchrnul(str_uid, ':');
|
||||
/* 2nd field: uid:gid - device ownership */
|
||||
{
|
||||
struct passwd *pass;
|
||||
struct group *grp;
|
||||
char *str_uid = tokens[1];
|
||||
char *str_gid = strchrnul(str_uid, ':');
|
||||
|
||||
if (*str_gid)
|
||||
*str_gid++ = '\0';
|
||||
/* Parse UID */
|
||||
pass = getpwnam(str_uid);
|
||||
if (pass)
|
||||
uid = pass->pw_uid;
|
||||
else
|
||||
uid = strtoul(str_uid, NULL, 10);
|
||||
/* Parse GID */
|
||||
grp = getgrnam(str_gid);
|
||||
if (grp)
|
||||
gid = grp->gr_gid;
|
||||
else
|
||||
gid = strtoul(str_gid, NULL, 10);
|
||||
}
|
||||
if (*str_gid)
|
||||
*str_gid++ = '\0';
|
||||
/* Parse UID */
|
||||
pass = getpwnam(str_uid);
|
||||
if (pass)
|
||||
uid = pass->pw_uid;
|
||||
else
|
||||
uid = strtoul(str_uid, NULL, 10);
|
||||
/* Parse GID */
|
||||
grp = getgrnam(str_gid);
|
||||
if (grp)
|
||||
gid = grp->gr_gid;
|
||||
else
|
||||
gid = strtoul(str_gid, NULL, 10);
|
||||
}
|
||||
|
||||
/* 3rd field: mode - device permissions */
|
||||
mode = strtoul(tokens[2], NULL, 8);
|
||||
/* 3rd field: mode - device permissions */
|
||||
mode = strtoul(tokens[2], NULL, 8);
|
||||
|
||||
val = tokens[3];
|
||||
/* 4th field (opt): >alias */
|
||||
val = tokens[3];
|
||||
/* 4th field (opt): >alias */
|
||||
#if ENABLE_FEATURE_MDEV_RENAME
|
||||
if (!val)
|
||||
break;
|
||||
aliaslink = *val;
|
||||
if (aliaslink == '>' || aliaslink == '=') {
|
||||
char *s;
|
||||
if (!val)
|
||||
break;
|
||||
aliaslink = *val;
|
||||
if (aliaslink == '>' || aliaslink == '=') {
|
||||
char *s;
|
||||
#if ENABLE_FEATURE_MDEV_RENAME_REGEXP
|
||||
char *p;
|
||||
unsigned i, n;
|
||||
char *p;
|
||||
unsigned i, n;
|
||||
#endif
|
||||
char *a = val;
|
||||
s = strchr(val, ' ');
|
||||
val = (s && s[1]) ? s+1 : NULL;
|
||||
char *a = val;
|
||||
s = strchr(val, ' ');
|
||||
val = (s && s[1]) ? s+1 : NULL;
|
||||
#if ENABLE_FEATURE_MDEV_RENAME_REGEXP
|
||||
/* substitute %1..9 with off[1..9], if any */
|
||||
n = 0;
|
||||
s = a;
|
||||
while (*s)
|
||||
if (*s++ == '%')
|
||||
n++;
|
||||
/* substitute %1..9 with off[1..9], if any */
|
||||
n = 0;
|
||||
s = a;
|
||||
while (*s)
|
||||
if (*s++ == '%')
|
||||
n++;
|
||||
|
||||
p = alias = xzalloc(strlen(a) + n * strlen(device_name));
|
||||
s = a + 1;
|
||||
while (*s) {
|
||||
*p = *s;
|
||||
if ('%' == *s) {
|
||||
i = (s[1] - '0');
|
||||
if (i <= 9 && off[i].rm_so >= 0) {
|
||||
n = off[i].rm_eo - off[i].rm_so;
|
||||
strncpy(p, device_name + off[i].rm_so, n);
|
||||
p += n - 1;
|
||||
s++;
|
||||
}
|
||||
p = alias = xzalloc(strlen(a) + n * strlen(device_name));
|
||||
s = a + 1;
|
||||
while (*s) {
|
||||
*p = *s;
|
||||
if ('%' == *s) {
|
||||
i = (s[1] - '0');
|
||||
if (i <= 9 && off[i].rm_so >= 0) {
|
||||
n = off[i].rm_eo - off[i].rm_so;
|
||||
strncpy(p, device_name + off[i].rm_so, n);
|
||||
p += n - 1;
|
||||
s++;
|
||||
}
|
||||
p++;
|
||||
s++;
|
||||
}
|
||||
#else
|
||||
alias = xstrdup(a + 1);
|
||||
#endif
|
||||
p++;
|
||||
s++;
|
||||
}
|
||||
#else
|
||||
alias = xstrdup(a + 1);
|
||||
#endif
|
||||
}
|
||||
#endif /* ENABLE_FEATURE_MDEV_RENAME */
|
||||
|
||||
/* The rest (opt): command to run */
|
||||
if (!val)
|
||||
break;
|
||||
if (ENABLE_FEATURE_MDEV_EXEC) {
|
||||
const char *s = "@$*";
|
||||
const char *s2 = strchr(s, *val);
|
||||
#if ENABLE_FEATURE_MDEV_EXEC
|
||||
/* The rest (opt): command to run */
|
||||
if (!val)
|
||||
break;
|
||||
{
|
||||
const char *s = "@$*";
|
||||
const char *s2 = strchr(s, *val);
|
||||
|
||||
if (!s2)
|
||||
bb_error_msg_and_die("bad line %u", parser->lineno);
|
||||
if (!s2)
|
||||
bb_error_msg_and_die("bad line %u", parser->lineno);
|
||||
|
||||
/* Correlate the position in the "@$*" with the delete
|
||||
* step so that we get the proper behavior:
|
||||
* @cmd: run on create
|
||||
* $cmd: run on delete
|
||||
* *cmd: run on both
|
||||
*/
|
||||
if ((s2 - s + 1) /*1/2/3*/ & /*1/2*/ (1 + delete)) {
|
||||
command = xstrdup(val + 1);
|
||||
}
|
||||
/* Correlate the position in the "@$*" with the delete
|
||||
* step so that we get the proper behavior:
|
||||
* @cmd: run on create
|
||||
* $cmd: run on delete
|
||||
* *cmd: run on both
|
||||
*/
|
||||
if ((s2 - s + 1) /*1/2/3*/ & /*1/2*/ (1 + delete)) {
|
||||
command = xstrdup(val + 1);
|
||||
}
|
||||
/* end of field parsing */
|
||||
break; /* we found matching line, stop */
|
||||
} /* end of "while line is read from /etc/mdev.conf" */
|
||||
}
|
||||
#endif
|
||||
/* end of field parsing */
|
||||
break; /* we found matching line, stop */
|
||||
} /* end of "while line is read from /etc/mdev.conf" */
|
||||
|
||||
config_close(parser);
|
||||
}
|
||||
config_close(parser);
|
||||
end_parse:
|
||||
#endif /* ENABLE_FEATURE_MDEV_CONF */
|
||||
|
||||
if (!delete && sscanf(dev_maj_min, "%u:%u", &major, &minor) == 2) {
|
||||
|
||||
@ -247,23 +258,26 @@ static void make_device(char *path, int delete)
|
||||
if (major == root_major && minor == root_minor)
|
||||
symlink(device_name, "root");
|
||||
|
||||
if (ENABLE_FEATURE_MDEV_CONF) {
|
||||
chown(device_name, uid, gid);
|
||||
#if ENABLE_FEATURE_MDEV_CONF
|
||||
chown(device_name, uid, gid);
|
||||
|
||||
if (ENABLE_FEATURE_MDEV_RENAME && alias) {
|
||||
alias = build_alias(alias, device_name);
|
||||
#if ENABLE_FEATURE_MDEV_RENAME
|
||||
if (alias) {
|
||||
alias = build_alias(alias, device_name);
|
||||
|
||||
/* move the device, and optionally
|
||||
* make a symlink to moved device node */
|
||||
if (rename(device_name, alias) == 0 && aliaslink == '>')
|
||||
symlink(alias, device_name);
|
||||
/* move the device, and optionally
|
||||
* make a symlink to moved device node */
|
||||
if (rename(device_name, alias) == 0 && aliaslink == '>')
|
||||
symlink(alias, device_name);
|
||||
|
||||
free(alias);
|
||||
}
|
||||
free(alias);
|
||||
}
|
||||
#endif
|
||||
#endif
|
||||
}
|
||||
|
||||
if (ENABLE_FEATURE_MDEV_EXEC && command) {
|
||||
#if ENABLE_FEATURE_MDEV_EXEC
|
||||
if (command) {
|
||||
/* setenv will leak memory, use putenv/unsetenv/free */
|
||||
char *s = xasprintf("MDEV=%s", device_name);
|
||||
putenv(s);
|
||||
@ -274,16 +288,19 @@ static void make_device(char *path, int delete)
|
||||
free(s);
|
||||
free(command);
|
||||
}
|
||||
#endif
|
||||
|
||||
if (delete) {
|
||||
unlink(device_name);
|
||||
/* At creation time, device might have been moved
|
||||
* and a symlink might have been created. Undo that. */
|
||||
if (ENABLE_FEATURE_MDEV_RENAME && alias) {
|
||||
#if ENABLE_FEATURE_MDEV_RENAME
|
||||
if (alias) {
|
||||
alias = build_alias(alias, device_name);
|
||||
unlink(alias);
|
||||
free(alias);
|
||||
}
|
||||
#endif
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user