f7bb25f702
Requested by: jhb
199 lines
5.3 KiB
C
199 lines
5.3 KiB
C
/*
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* FreeBSD install - a package for the installation and maintainance
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* of non-core utilities.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* Maxim Sobolev
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* 14 March 2001
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*
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* Routines used to do various operations with dependencies
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* among installed packages.
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*
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "lib.h"
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#include <err.h>
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#include <stdio.h>
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/*
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* Sort given NULL-terminated list of installed packages (pkgs) in
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* such a way that if package A depends on package B then after
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* sorting A will be listed before B no matter how they were
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* originally positioned in the list.
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*/
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int
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sortdeps(char **pkgs)
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{
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char *tmp;
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int i, j, loop_cnt;
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int err_cnt = 0;
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if (pkgs[0] == NULL || pkgs[1] == NULL)
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return (0);
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for (i = 0; pkgs[i + 1]; i++) {
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/*
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* Check to see if any other package in pkgs[i+1:] depends
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* on pkgs[i] and swap those two packages if so.
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*/
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loop_cnt = 0;
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for (j = i + 1; pkgs[j]; j++) {
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if (chkifdepends(pkgs[j], pkgs[i]) == 1) {
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/*
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* Try to avoid deadlock if package A depends on B which in
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* turn depends on C and C due to an error depends on A.
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* Use ugly but simple method, becase it Should Never
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* Happen[tm] in the real life anyway.
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*/
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if (loop_cnt > 4096) {
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warnx("dependency loop detected for package %s", pkgs[j]);
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err_cnt++;
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break;
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}
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loop_cnt++;
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tmp = pkgs[i];
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pkgs[i] = pkgs[j];
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pkgs[j] = tmp;
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/*
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* Another iteration requred to check if new pkgs[i]
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* itself has any packages that depend on it
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*/
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j = i + 1;
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}
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}
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}
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return err_cnt;
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}
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/*
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* Check to see if pkgname1 depends on pkgname2.
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* Returns 1 if depends, 0 if not, and -1 if error occured.
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*/
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int
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chkifdepends(const char *pkgname1, const char *pkgname2)
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{
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char *cp1, *cp2;
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char pkgdir[FILENAME_MAX];
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int errcode;
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struct reqr_by_entry *rb_entry;
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struct reqr_by_head *rb_list;
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cp2 = strchr(pkgname2, ':');
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if (cp2 != NULL)
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*cp2 = '\0';
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cp1 = strchr(pkgname1, ':');
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if (cp1 != NULL)
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*cp1 = '\0';
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errcode = 0;
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/* Check that pkgname2 is actually installed */
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snprintf(pkgdir, sizeof(pkgdir), "%s/%s", LOG_DIR, pkgname2);
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if (!isdir(pkgdir))
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goto exit;
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errcode = requiredby(pkgname2, &rb_list, FALSE, TRUE);
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if (errcode < 0)
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goto exit;
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errcode = 0;
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STAILQ_FOREACH(rb_entry, rb_list, link) {
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if (strcmp(rb_entry->pkgname, pkgname1) == 0) { /* match */
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errcode = 1;
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break;
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}
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}
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exit:
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if (cp1 != NULL)
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*cp1 = ':';
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if (cp2 != NULL)
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*cp2 = ':';
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return errcode;
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}
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/*
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* Load +REQUIRED_BY file and return a list with names of
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* packages that require package reffered to by `pkgname'.
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*
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* Optionally check that packages listed there are actually
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* installed and filter out those that don't (filter == TRUE).
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*
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* strict argument controls whether the caller want warnings
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* to be emitted when there are some non-fatal conditions,
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* i.e. package doesn't have +REQUIRED_BY file or some packages
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* listed in +REQUIRED_BY don't exist.
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*
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* Result returned in the **list, while return value is equal
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* to the number of entries in the resulting list. Print error
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* message and return -1 on error.
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*/
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int
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requiredby(const char *pkgname, struct reqr_by_head **list, Boolean strict, Boolean filter)
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{
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FILE *fp;
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char fbuf[FILENAME_MAX], fname[FILENAME_MAX], pkgdir[FILENAME_MAX];
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int retval;
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struct reqr_by_entry *rb_entry;
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static struct reqr_by_head rb_list = STAILQ_HEAD_INITIALIZER(rb_list);
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*list = &rb_list;
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/* Deallocate any previously allocated space */
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while (!STAILQ_EMPTY(&rb_list)) {
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rb_entry = STAILQ_FIRST(&rb_list);
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STAILQ_REMOVE_HEAD(&rb_list, link);
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free(rb_entry);
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}
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snprintf(fname, sizeof(fname), "%s/%s", LOG_DIR, pkgname);
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if (!isdir(fname)) {
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if (strict == TRUE)
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warnx("no such package '%s' installed", pkgname);
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return -1;
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}
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snprintf(fname, sizeof(fname), "%s/%s", fname, REQUIRED_BY_FNAME);
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fp = fopen(fname, "r");
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if (fp == NULL) {
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/* Probably pkgname doesn't have any packages that depend on it */
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if (strict == TRUE)
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warnx("couldn't open dependency file '%s'", fname);
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return 0;
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}
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retval = 0;
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while (fgets(fbuf, sizeof(fbuf), fp) != NULL) {
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if (fbuf[strlen(fbuf) - 1] == '\n')
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fbuf[strlen(fbuf) - 1] = '\0';
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snprintf(pkgdir, sizeof(pkgdir), "%s/%s", LOG_DIR, fbuf);
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if (filter == TRUE && !isdir(pkgdir)) {
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if (strict == TRUE)
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warnx("package '%s' is recorded in the '%s' but isn't "
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"actually installed", fbuf, fname);
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continue;
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}
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retval++;
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rb_entry = malloc(sizeof(*rb_entry));
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if (rb_entry == NULL) {
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warnx("%s(): malloc() failed", __func__);
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retval = -1;
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break;
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}
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strlcpy(rb_entry->pkgname, fbuf, sizeof(rb_entry->pkgname));
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STAILQ_INSERT_TAIL(&rb_list, rb_entry, link);
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}
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fclose(fp);
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return retval;
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}
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