/*
scconfig - dependencies
Copyright (C) 2009 Tibor Palinkas
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
Project page: http://repo.hu/projects/scconfig
Contact via email: scconfig [at] igor2.repo.hu
*/
#include <stdlib.h>
#include <string.h>
#include "dep.h"
#include "db.h"
#include "log.h"
#include "libs.h"
typedef struct {
int (*fn)(const char *name, int logdepth, int fatal);
} fn_wrap_t;
static ht_t *deps = NULL;
static const char *USER_WITHOUT = "";
/* find name_ and decide if it was a wildcard request;
NOTE: there are requests and servers, both can be wildcard independently.
- if a request ends with a / *, it is an explicit wildcard request (*wild=1)
- if a request names a "directory" that is wildcard-server, that's a wildcard request (*wild=1)
- else the request is a normal request (*wild=0).
For normal requests, a required node was explicitly named; if that node is
not created by the detection function, that's a failure. For wildcard
requests we don't look for any specific node to be created.
TODO: we may still check if at least the directory is created
*/
fn_wrap_t *get_wrap(const char *name_, int *wild, int *missing)
{
fn_wrap_t *w;
char *name, *sep, *tmp;
int len, n;
len = strlen(name_);
*wild = name_[len-1] == '*';
if (*wild) {
char *pres;
pres = malloc(len+16);
memcpy(pres, name_, len-1);
strcpy(pres+len-1, "presents");
*missing = get(pres) == NULL;
if (*missing) { /* if there's no /presents, it may be a non-directory node with an actual non-empty string value */
const char *val;
pres[len-2] = '\0';
val = get(pres);
if (val != NULL)
*missing = !strlen(val);
}
free(pres);
if (!(*missing)) /* already detected, won't be detected again */
return NULL;
}
*missing = 1;
/* check for global --without disable */
tmp = str_concat("", "/arg/without", db_cwd, "/", name_, NULL);
sep = tmp + strlen(tmp) - 1;
for(n = 0; n < 4; n++) {
const char *d = get(tmp);
if (sep < tmp+14)
break;
if (istrue(d)) {
free(tmp);
return USER_WITHOUT;
}
while(*sep != '/')
sep--;
*sep = '\0';
}
free(tmp);
/* try full match first */
w = ht_get(deps, name_);
if (w != NULL)
return w;
/* try substituting the last part of the path with * for wildcard matches */
name = malloc(len+3); /* worst case: ends in a / and we need to append *\0; allocate a bit more */
memcpy(name, name_, len+1); /* make a copy we can modify */
if (name[len-1] != '/') {
name[len] = '/'; /* append a / - if name_ was a "directory", this will result in name/ * */
name[len+1] = '\0';
}
*wild = 1; /* if we append a / *, then it's a wildcard request */
for(;;) {
sep = str_rchr(name, '/');
if (sep == NULL)
goto error;
sep[1] = '*';
sep[2] = '\0';
w = ht_get(deps, name);
if (w != NULL) {
free(name);
return w;
}
*sep = '\0';
*wild = 0; /* cutting back the second layer - not wildcard request anymore, but a request to a specific node served by a wildcard */
}
/* no match, exit with error */
error:;
*wild = 0;
free(name);
return NULL;
}
int require(const char *name, int logdepth, int fatal)
{
fn_wrap_t *w;
int wild, missing;
if (get(name) == NULL) {
w = get_wrap(name, &wild, &missing);
if (w == USER_WITHOUT) {
if (fatal) {
error("Node %s is required by the software but disabled by the user using --without\n", name);
abort();
}
else {
logprintf(logdepth, "(disabled using --without)");
return 1;
}
}
if (!missing)
return 0;
if ((w == NULL) || (w->fn == NULL)) {
error("Node %s is required but I don't know how to detect it.\n", name);
abort();
}
logprintf(logdepth, "(Required node: '%s')\n", name);
if (w->fn(name, logdepth+1, fatal) != 0) {
if (fatal) {
error("Node %s is required but provided detection callback fails to find that feature on that system.\n", name);
abort();
}
else {
logprintf(logdepth, "(Feature not found, but it is not fatal)");
return 1;
}
}
if ((!wild) && (get(name) == NULL)) {
error("Node %s is required but provided detection callback didn't create it (looks like an internal error in scconfig). (db_cwd='%s')\n", name, db_cwd);
abort();
}
}
return 0;
}
const char *dep_add(const char *name, int (*finder)(const char *name, int logdepth, int fatal))
{
fn_wrap_t *w;
w = malloc(sizeof(fn_wrap_t));
w->fn = finder;
return ht_set(deps, name, w);
}
int asked_for(const char *cando, const char *needtodo)
{
int len;
/* foo/bar/baz matches /foo/bar/baz */
if (strcmp(cando, needtodo) == 0)
goto yes;
len = strlen(needtodo);
if (len == 0)
return 0;
/* foo/bar/baz matches /foo/bar/ * */
if ((needtodo[len-1] == '*') && (strncmp(cando, needtodo, len-1) == 0))
goto yes;
return 0;
yes:; /* asked for it, but have to see if it's already detected */
if (get(cando) != NULL)
return 0;
return 1;
}
int is_dep_wild(const char *path)
{
int len = strlen(path);
if (len == 0)
return 0;
return (path[len-1] == '*');
}
const char *det_list_target(const char *path)
{
const char *res;
if (path == NULL)
goto unk;
res = strrchr(path, '/');
if (res == NULL)
goto unk;
return res + 1;
unk:;
return "<unknown>";
}
void dep_init(void)
{
deps = ht_resize(ht_alloc(0), 128);
}
void dep_uninit(void)
{
ht_free(deps);
}
int is_dep_known(const char *name)
{
return (ht_get(deps, name) != NULL);
}
void require_all(int fatal)
{
ht_entry_t *h;
for(h = ht_first(deps); h != NULL; h = ht_next(deps, h))
require(h->key, 0, fatal);
}