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/*
* FreeBSD install - a package for the installation and maintainance
* of non-core utilities.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* Maxim Sobolev
* 14 March 2001
*
* Routines used to do various operations with dependencies
* among installed packages.
*
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "lib.h"
#include <err.h>
#include <stdio.h>
/*
* Sort given NULL-terminated list of installed packages (pkgs) in
* such a way that if package A depends on package B then after
* sorting A will be listed before B no matter how they were
* originally positioned in the list.
*/
int
sortdeps(char **pkgs)
{
char *tmp;
int i, j, loop_cnt;
int err_cnt = 0;
if (pkgs[0] == NULL || pkgs[1] == NULL)
return (0);
for (i = 0; pkgs[i + 1]; i++) {
/*
* Check to see if any other package in pkgs[i+1:] depends
* on pkgs[i] and swap those two packages if so.
*/
loop_cnt = 0;
for (j = i + 1; pkgs[j]; j++) {
if (chkifdepends(pkgs[j], pkgs[i]) == 1) {
/*
* Try to avoid deadlock if package A depends on B which in
* turn depends on C and C due to an error depends on A.
* Use ugly but simple method, becase it Should Never
* Happen[tm] in the real life anyway.
*/
if (loop_cnt > 4096) {
warnx("dependency loop detected for package %s", pkgs[j]);
err_cnt++;
break;
}
loop_cnt++;
tmp = pkgs[i];
pkgs[i] = pkgs[j];
pkgs[j] = tmp;
/*
* Another iteration requred to check if new pkgs[i]
* itself has any packages that depend on it
*/
j = i + 1;
}
}
}
return err_cnt;
}
/*
* Check to see if pkgname1 depends on pkgname2.
* Returns 1 if depends, 0 if not, and -1 if error occured.
*/
int
chkifdepends(const char *pkgname1, const char *pkgname2)
{
char *cp1, *cp2;
int errcode;
struct reqr_by_entry *rb_entry;
struct reqr_by_head *rb_list;
cp2 = strchr(pkgname2, ':');
if (cp2 != NULL)
*cp2 = '\0';
cp1 = strchr(pkgname1, ':');
if (cp1 != NULL)
*cp1 = '\0';
errcode = 0;
/* Check that pkgname2 is actually installed */
if (isinstalledpkg(pkgname2) <= 0)
goto exit;
errcode = requiredby(pkgname2, &rb_list, FALSE, TRUE);
if (errcode < 0)
goto exit;
errcode = 0;
STAILQ_FOREACH(rb_entry, rb_list, link) {
if (strcmp(rb_entry->pkgname, pkgname1) == 0) { /* match */
errcode = 1;
break;
}
}
exit:
if (cp1 != NULL)
*cp1 = ':';
if (cp2 != NULL)
*cp2 = ':';
return errcode;
}
/*
* Load +REQUIRED_BY file and return a list with names of
* packages that require package reffered to by `pkgname'.
*
* Optionally check that packages listed there are actually
* installed and filter out those that don't (filter == TRUE).
*
* strict argument controls whether the caller want warnings
* to be emitted when there are some non-fatal conditions,
* i.e. package doesn't have +REQUIRED_BY file or some packages
* listed in +REQUIRED_BY don't exist.
*
* Result returned in the **list, while return value is equal
* to the number of entries in the resulting list. Print error
* message and return -1 on error.
*/
int
requiredby(const char *pkgname, struct reqr_by_head **list, Boolean strict, Boolean filter)
{
FILE *fp;
char fbuf[FILENAME_MAX], fname[FILENAME_MAX];
int retval;
struct reqr_by_entry *rb_entry;
static struct reqr_by_head rb_list = STAILQ_HEAD_INITIALIZER(rb_list);
*list = &rb_list;
/* Deallocate any previously allocated space */
while (!STAILQ_EMPTY(&rb_list)) {
rb_entry = STAILQ_FIRST(&rb_list);
STAILQ_REMOVE_HEAD(&rb_list, link);
free(rb_entry);
}
if (isinstalledpkg(pkgname) <= 0) {
if (strict == TRUE)
warnx("no such package '%s' installed", pkgname);
return -1;
}
snprintf(fname, sizeof(fname), "%s/%s/%s", LOG_DIR, pkgname,
REQUIRED_BY_FNAME);
fp = fopen(fname, "r");
if (fp == NULL) {
/* Probably pkgname doesn't have any packages that depend on it */
if (strict == TRUE)
warnx("couldn't open dependency file '%s'", fname);
return 0;
}
retval = 0;
while (fgets(fbuf, sizeof(fbuf), fp) != NULL) {
if (fbuf[strlen(fbuf) - 1] == '\n')
fbuf[strlen(fbuf) - 1] = '\0';
if (filter == TRUE && isinstalledpkg(fbuf) <= 0) {
if (strict == TRUE)
warnx("package '%s' is recorded in the '%s' but isn't "
"actually installed", fbuf, fname);
continue;
}
retval++;
rb_entry = malloc(sizeof(*rb_entry));
if (rb_entry == NULL) {
warnx("%s(): malloc() failed", __func__);
retval = -1;
break;
}
strlcpy(rb_entry->pkgname, fbuf, sizeof(rb_entry->pkgname));
STAILQ_INSERT_TAIL(&rb_list, rb_entry, link);
}
fclose(fp);
return retval;
}
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