summaryrefslogtreecommitdiff
path: root/modutils
diff options
context:
space:
mode:
Diffstat (limited to 'modutils')
-rw-r--r--modutils/Config.in14
-rw-r--r--modutils/depmod.c128
2 files changed, 121 insertions, 21 deletions
diff --git a/modutils/Config.in b/modutils/Config.in
index c69e1b3..fb7fb22 100644
--- a/modutils/Config.in
+++ b/modutils/Config.in
@@ -11,6 +11,20 @@ config DEPMOD
help
depmod generates modules.dep (FIXME: elaborate)
+config FEATURE_DEPMOD_PRUNE_FANCY
+ bool "fancy dependency pruning"
+ default n
+ depends on DEPMOD
+ help
+ By default modules.dep contains all dependencies as listed by
+ the modules.
+ If you enable this option then we remove implied modules from
+ the dependencies.
+ This makes depmod somewhat bigger but generates a smaller
+ modules.dep file.
+
+ If unsure, say N.
+
config INSMOD
bool "insmod"
default n
diff --git a/modutils/depmod.c b/modutils/depmod.c
index e061501..b0b09c2 100644
--- a/modutils/depmod.c
+++ b/modutils/depmod.c
@@ -10,15 +10,27 @@
#define _GNU_SOURCE
#include <libbb.h>
#include <sys/utsname.h> /* uname() */
-
+#if ENABLE_DEBUG
+#include <assert.h>
+#define dbg_assert assert
+#else
+#define dbg_assert(stuff) do {} while (0)
+#endif
/*
* Theory of operation:
* - iterate over all modules and record their full path
* - iterate over all modules looking for "depends=" entries
* for each depends, look through our list of full paths and emit if found
*/
+
+typedef struct dep_lst_t {
+ char *name;
+ llist_t *dependencies;
+ struct dep_lst_t *next;
+} dep_lst_t;
+
struct globals {
- llist_t *lst; /* modules without their corresponding extension */
+ dep_lst_t *lst; /* modules without their corresponding extension */
size_t moddir_base_len; /* length of the "-b basedir" */
};
#define G (*(struct globals*)&bb_common_bufsiz1)
@@ -28,22 +40,28 @@ struct globals {
static int fill_lst(const char *modulename, struct stat ATTRIBUTE_UNUSED *sb,
void ATTRIBUTE_UNUSED *data, int ATTRIBUTE_UNUSED depth)
{
+
/* We get a file here. If the file does not have ".ko" but an
* intermittent dentry has, it's just their fault.
*/
- if (strrstr(modulename, ".ko") != NULL)
- llist_add_to(&G.lst, xstrdup(modulename + G.moddir_base_len));
+ if (strrstr(modulename, ".ko") != NULL) {
+ dep_lst_t *new = xzalloc(sizeof(dep_lst_t));
+ new->name = xstrdup(modulename + G.moddir_base_len);
+ new->next = G.lst;
+ G.lst = new;
+ }
return TRUE;
}
static int fileAction(const char *fname, struct stat *sb,
- void *data, int ATTRIBUTE_UNUSED depth)
+ void ATTRIBUTE_UNUSED *data, int ATTRIBUTE_UNUSED depth)
{
size_t len = sb->st_size;
void *the_module;
char *ptr;
int fd;
char *depends, *deps;
+ dep_lst_t *this;
if (strrstr(fname, ".ko") == NULL) /* not a module */
goto skip;
@@ -61,40 +79,44 @@ static int fileAction(const char *fname, struct stat *sb,
close(fd);
if (the_module == MAP_FAILED)
bb_perror_msg_and_die("mmap");
-
ptr = the_module;
-
- fprintf((FILE*)data, "%s:", fname + G.moddir_base_len);
+ this = G.lst;
+ do {
+ if (!strcmp(fname + G.moddir_base_len, this->name))
+ break;
+ this = this->next;
+ } while (this);
+ dbg_assert (this);
//bb_info_msg("fname='%s'", fname + G.moddir_base_len);
do {
/* search for a 'd' */
ptr = memchr(ptr, 'd', len - (ptr - (char*)the_module));
if (ptr == NULL) /* no d left, done */
goto none;
- if (strncmp(ptr, "depends=", sizeof("depends=")-1) == 0)
+ if (!strncmp(ptr, "depends=", sizeof("depends=")-1))
break;
++ptr;
} while (1);
deps = depends = xstrdup (ptr + sizeof("depends=")-1);
//bb_info_msg(" depends='%s'", depends);
while (deps) {
- llist_t * _lst = G.lst;
+ dep_lst_t *all = G.lst;
ptr = strsep(&deps, ",");
- while (_lst) {
+ while (all) {
/* Compare the recorded filenames ignoring ".ko*" at the end. */
- char *tmp = bb_get_last_path_component_nostrip(_lst->data);
- if (strncmp(ptr, tmp, strrstr(tmp, ".ko") - tmp) == 0)
+ char *tmp = bb_get_last_path_component_nostrip(all->name);
+ if (!strncmp(ptr, tmp, MAX(strlen(ptr),strrstr(tmp, ".ko") - tmp)))
break; /* found it */
- _lst = _lst->link;
+ all = all->next;
}
- if (_lst) {
-//bb_info_msg("[%s] -> '%s'", (char*)ptr, _lst->data);
- fprintf((FILE*)data, " %s", _lst->data);
+ if (all) {
+ dbg_assert(all->name); /* this cannot be empty */
+//bb_info_msg("[%s] -> '%s'", (char*)ptr, all->name);
+ llist_add_to_end(&this->dependencies, all->name);
}
}
free(depends);
- fprintf((FILE*)data, "\n");
none:
munmap(the_module, sb->st_size);
skip:
@@ -115,11 +137,14 @@ int depmod_main(int ATTRIBUTE_UNUSED argc, char **argv)
ARG_F = (1<<4), /* System.map that contains the symbols */
ARG_n = (1<<5) /* dry-run, print to stdout only */
};
+ INIT_G();
getopt32(argv, "aAb:eF:n", &moddir_base, &system_map);
argv += optind;
- /* got a version to use? */
+ /* If a version is provided, then that kernel version’s module directory
+ * is used, rather than the current kernel version (as returned by
+ * "uname -r"). */
if (*argv && (sscanf(*argv, "%d.%d.%d", &ret, &ret, &ret) == 3)) {
moddir = concat_path_file(CONFIG_DEFAULT_MODULES_DIR, *argv++);
} else {
@@ -160,6 +185,9 @@ int depmod_main(int ATTRIBUTE_UNUSED argc, char **argv)
else
return EXIT_FAILURE;
}
+#if ENABLE_FEATURE_CLEAN_UP
+ else
+#endif
do {
chp = option_mask32 & ARG_a ? moddir : *argv++;
@@ -167,16 +195,74 @@ int depmod_main(int ATTRIBUTE_UNUSED argc, char **argv)
ACTION_RECURSE, /* flags */
fileAction, /* file action */
NULL, /* dir action */
- (void*)filedes, /* user data */
+ NULL, /* user data */
0)) { /* depth */
ret = EXIT_FAILURE;
}
} while (!(option_mask32 & ARG_a) && *argv);
+ /* modprobe allegedly wants dependencies without duplicates, i.e.
+ * mod1: mod2 mod3
+ * mod2: mod3
+ * mod3:
+ * implies that mod1 directly depends on mod2 and _not_ mod3 as mod3 is
+ * already implicitely pulled in via mod2. This leaves us with:
+ * mod1: mod2
+ * mod2: mod3
+ * mod3:
+ */
+ {
+ dep_lst_t *mods = G.lst;
+#if ENABLE_FEATURE_DEPMOD_PRUNE_FANCY
+ while (mods) {
+ llist_t *deps = mods->dependencies;
+ while (deps) {
+ dep_lst_t *all = G.lst;
+ while (all) {
+ if (!strcmp(all->name, deps->data)) {
+ llist_t *implied = all->dependencies;
+ while (implied) {
+ /* erm, nicer would be to just
+ * llist_unlink(&mods->dependencies, implied) */
+ llist_t *prune = mods->dependencies;
+ while (prune) {
+ if (!strcmp(implied->data, prune->data))
+ break;
+ prune = prune->link;
+ }
+//if (prune) bb_info_msg("[%s] '%s' implies '%s', removing", mods->name, all->name, implied->data);
+ llist_unlink(&mods->dependencies, prune);
+ implied = implied->link;
+ }
+ }
+ all = all->next;
+ }
+ deps = deps->link;
+ }
+ mods = mods->next;
+ }
+
+ mods = G.lst;
+#endif
+ /* Finally print them. */
+ while (mods) {
+ fprintf(filedes, "%s:", mods->name);
+ while (mods->dependencies)
+ fprintf(filedes, " %s", (char*)llist_pop(&mods->dependencies));
+ fprintf(filedes, "\n");
+ mods = mods->next;
+ }
+ }
+
if (ENABLE_FEATURE_CLEAN_UP) {
fclose_if_not_stdin(filedes);
- llist_free(G.lst, free);
free(moddir);
+ while (G.lst) {
+ dep_lst_t *old = G.lst;
+ G.lst = G.lst->next;
+ free(old->name);
+ free(old);
+ }
}
return ret;
}
generated by cgit v1.1 at 2024-12-30 22:18:42 +0000