kmod_module: do not find more than the first command

modprobe from module-init-tools does not use more than one
install/remove command, it just stops on the first one. Test
modprobe.conf:

install bla echo "this is a message"
install bla echo "this is a message"

$ modprobe bla
this is a message
$

Install and remove commands are already a legacy thing we need to carry,
but let's not extend it so people do not start doing crazy things.

With this patch we are breaking on the first element we find in the
configuration. May be we can add a warning later when parsing the config
that install commands are duplicated.

diff --git a/libkmod/libkmod-module.c b/libkmod/libkmod-module.c
index 80da684b015436920ea25252a616e9314f81bbb0..e901b767d6b05d5b47c9a1aa9773b14979f5e548 100644 (file)
--- a/libkmod/libkmod-module.c
+++ b/libkmod/libkmod-module.c
@@ -50,8 +50,8 @@ struct kmod_module {
        char *path;
        struct kmod_list *dep;
        char *options;
-       char *install_commands;
-       char *remove_commands;
+       const char *install_commands;   /* owned by kmod_config */
+       const char *remove_commands;    /* owned by kmod_config */
        char *alias; /* only set if this module was created from an alias */
        int n_dep;
        int refcount;
@@ -396,8 +396,6 @@ KMOD_EXPORT struct kmod_module *kmod_module_unref(struct kmod_module *mod)
        kmod_module_unref_list(mod->dep);
        kmod_unref(mod->ctx);
        free(mod->options);
-       free(mod->install_commands);
-       free(mod->remove_commands);
        free(mod->path);
        free(mod);
        return NULL;
@@ -827,52 +825,28 @@ KMOD_EXPORT const char *kmod_module_get_install_commands(const struct kmod_modul
                /* lazy init */
                struct kmod_module *m = (struct kmod_module *)mod;
                const struct kmod_list *l, *ctx_install_commands;
-               char *cmds = NULL;
-               size_t cmdslen = 0;
 
                ctx_install_commands = kmod_get_install_commands(mod->ctx);
 
                kmod_list_foreach(l, ctx_install_commands) {
                        const char *modname = kmod_command_get_modname(l);
-                       const char *str;
-                       size_t len;
-                       void *tmp;
 
                        if (strcmp(modname, mod->name) != 0)
                                continue;
 
-                       str = kmod_command_get_command(l);
-                       len = strlen(str);
-                       if (len < 1)
-                               continue;
-
-                       tmp = realloc(cmds, cmdslen + len + 2);
-                       if (tmp == NULL) {
-                               free(cmds);
-                               goto failed;
-                       }
-
-                       cmds = tmp;
+                       m->install_commands = kmod_command_get_command(l);
 
-                       if (cmdslen > 0) {
-                               cmds[cmdslen] = ';';
-                               cmdslen++;
-                       }
-
-                       memcpy(cmds + cmdslen, str, len);
-                       cmdslen += len;
-                       cmds[cmdslen] = '\0';
+                       /*
+                        * find only the first command, as modprobe from
+                        * module-init-tools does
+                        */
+                       break;
                }
 
                m->init.install_commands = true;
-               m->install_commands = cmds;
        }
 
        return mod->install_commands;
-
-failed:
-       ERR(mod->ctx, "out of memory\n");
-       return NULL;
 }
 
 /**
@@ -898,52 +872,28 @@ KMOD_EXPORT const char *kmod_module_get_remove_commands(const struct kmod_module
                /* lazy init */
                struct kmod_module *m = (struct kmod_module *)mod;
                const struct kmod_list *l, *ctx_remove_commands;
-               char *cmds = NULL;
-               size_t cmdslen = 0;
 
                ctx_remove_commands = kmod_get_remove_commands(mod->ctx);
 
                kmod_list_foreach(l, ctx_remove_commands) {
                        const char *modname = kmod_command_get_modname(l);
-                       const char *str;
-                       size_t len;
-                       void *tmp;
 
                        if (strcmp(modname, mod->name) != 0)
                                continue;
 
-                       str = kmod_command_get_command(l);
-                       len = strlen(str);
-                       if (len < 1)
-                               continue;
-
-                       tmp = realloc(cmds, cmdslen + len + 2);
-                       if (tmp == NULL) {
-                               free(cmds);
-                               goto failed;
-                       }
-
-                       cmds = tmp;
+                       m->remove_commands = kmod_command_get_command(l);
 
-                       if (cmdslen > 0) {
-                               cmds[cmdslen] = ';';
-                               cmdslen++;
-                       }
-
-                       memcpy(cmds + cmdslen, str, len);
-                       cmdslen += len;
-                       cmds[cmdslen] = '\0';
+                       /*
+                        * find only the first command, as modprobe from
+                        * module-init-tools does
+                        */
+                       break;
                }
 
                m->init.remove_commands = true;
-               m->remove_commands = cmds;
        }
 
        return mod->remove_commands;
-
-failed:
-       ERR(mod->ctx, "out of memory\n");
-       return NULL;
 }
 
 /**