Fix a memleak involving lazy DB loading

[pacman-ng.git] / src / pacman / pacman.c

/*
 *  pacman.c
 *
 *  Copyright (c) 2006-2009 Pacman Development Team <pacman-dev@archlinux.org>
 *  Copyright (c) 2002-2006 by Judd Vinet <jvinet@zeroflux.org>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program 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 General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "config.h"

/* special handling of package version for GIT */
#if defined(GIT_VERSION)
#undef PACKAGE_VERSION
#define PACKAGE_VERSION GIT_VERSION
#endif

#include <stdlib.h> /* atoi */
#include <stdio.h>
#include <limits.h>
#include <getopt.h>
#include <string.h>
#include <signal.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/utsname.h> /* uname */
#include <locale.h> /* setlocale */
#include <time.h> /* time_t */
#include <errno.h>
#if defined(PACMAN_DEBUG) && defined(HAVE_MCHECK_H)
#include <mcheck.h> /* debug tracing (mtrace) */
#endif

/* alpm */
#include <alpm.h>
#include <alpm_list.h>

/* pacman */
#include "pacman.h"
#include "util.h"
#include "callback.h"
#include "conf.h"
#include "package.h"

pmdb_t *db_local;
/* list of targets specified on command line */
static alpm_list_t *pm_targets;

/** Display usage/syntax for the specified operation.
 * @param op     the operation code requested
 * @param myname basename(argv[0])
 */
static void usage(int op, const char * const myname)
{
        /* prefetch some strings for usage below, which moves a lot of calls
         * out of gettext. */
        char const * const str_opt = _("options");
        char const * const str_file = _("file(s)");
        char const * const str_pkg = _("package(s)");
        char const * const str_usg = _("usage");
        char const * const str_opr = _("operation");

        if(op == PM_OP_MAIN) {
                printf("%s:  %s <%s> [...]\n", str_usg, myname, str_opr);
                printf(_("operations:\n"));
                printf("    %s {-h --help}\n", myname);
                printf("    %s {-V --version}\n", myname);
                printf("    %s {-Q --query}   [%s] [%s]\n", myname, str_opt, str_pkg);
                printf("    %s {-R --remove}  [%s] <%s>\n", myname, str_opt, str_pkg);
                printf("    %s {-S --sync}    [%s] [%s]\n", myname, str_opt, str_pkg);
                printf("    %s {-U --upgrade} [%s] <%s>\n", myname, str_opt, str_file);
                printf(_("\nuse '%s {-h --help}' with an operation for available options\n"),
                                myname);
        } else {
                if(op == PM_OP_REMOVE) {
                        printf("%s:  %s {-R --remove} [%s] <%s>\n", str_usg, myname, str_opt, str_pkg);
                        printf("%s:\n", str_opt);
                        printf(_("  -c, --cascade        remove packages and all packages that depend on them\n"));
                        printf(_("  -d, --nodeps         skip dependency checks\n"));
                        printf(_("  -k, --dbonly         only remove database entry, do not remove files\n"));
                        printf(_("  -n, --nosave         remove configuration files as well\n"));
                        printf(_("  -s, --recursive      remove dependencies also (that won't break packages)\n"
                                 "                       (-ss includes explicitly installed dependencies too)\n"));
                        printf(_("  -u, --unneeded       remove unneeded packages (that won't break packages)\n"));
                } else if(op == PM_OP_UPGRADE) {
                        printf("%s:  %s {-U --upgrade} [%s] <%s>\n", str_usg, myname, str_opt, str_file);
                        printf("%s:\n", str_opt);
                        printf(_("      --asdeps         install packages as non-explicitly installed\n"));
                        printf(_("      --asexplicit     install packages as explicitly installed\n"));
                        printf(_("  -d, --nodeps         skip dependency checks\n"));
                        printf(_("  -f, --force          force install, overwrite conflicting files\n"));
                } else if(op == PM_OP_QUERY) {
                        printf("%s:  %s {-Q --query} [%s] [%s]\n", str_usg, myname, str_opt, str_pkg);
                        printf("%s:\n", str_opt);
                        printf(_("  -c, --changelog      view the changelog of a package\n"));
                        printf(_("  -d, --deps           list packages installed as dependencies [filter]\n"));
                        printf(_("  -e, --explicit       list packages explicitly installed [filter]\n"));
                        printf(_("  -g, --groups         view all members of a package group\n"));
                        printf(_("  -i, --info           view package information (-ii for backup files)\n"));
                        printf(_("  -k, --check          check that the files owned by the package(s) are present\n"));
                        printf(_("  -l, --list           list the contents of the queried package\n"));
                        printf(_("  -m, --foreign        list installed packages not found in sync db(s) [filter]\n"));
                        printf(_("  -o, --owns <file>    query the package that owns <file>\n"));
                        printf(_("  -p, --file <package> query a package file instead of the database\n"));
                        printf(_("  -s, --search <regex> search locally-installed packages for matching strings\n"));
                        printf(_("  -t, --unrequired     list packages not required by any package [filter]\n"));
                        printf(_("  -u, --upgrades       list outdated packages [filter]\n"));
                        printf(_("  -q, --quiet          show less information for query and search\n"));
                } else if(op == PM_OP_SYNC) {
                        printf("%s:  %s {-S --sync} [%s] [%s]\n", str_usg, myname, str_opt, str_pkg);
                        printf("%s:\n", str_opt);
                        printf(_("      --asdeps         install packages as non-explicitly installed\n"));
                        printf(_("      --asexplicit     install packages as explicitly installed\n"));
                        printf(_("  -c, --clean          remove old packages from cache directory (-cc for all)\n"));
                        printf(_("  -d, --nodeps         skip dependency checks\n"));
                        printf(_("  -f, --force          force install, overwrite conflicting files\n"));
                        printf(_("  -g, --groups         view all members of a package group\n"));
                        printf(_("  -i, --info           view package information\n"));
                        printf(_("  -l, --list <repo>    view a list of packages in a repo\n"));
                        printf(_("  -p, --print-uris     print out URIs for given packages and their dependencies\n"));
                        printf(_("  -s, --search <regex> search remote repositories for matching strings\n"));
                        printf(_("  -u, --sysupgrade     upgrade all outdated packages (-uu enables downgrade)\n"));
                        printf(_("  -w, --downloadonly   download packages but do not install/upgrade anything\n"));
                        printf(_("  -y, --refresh        download fresh package databases from the server\n"));
                        printf(_("      --needed         don't reinstall up to date packages\n"));
                        printf(_("      --ignore <pkg>   ignore a package upgrade (can be used more than once)\n"));
                        printf(_("      --ignoregroup <grp>\n"
                                 "                       ignore a group upgrade (can be used more than once)\n"));
                        printf(_("  -q, --quiet          show less information for query and search\n"));
                }
                printf(_("      --config <path>  set an alternate configuration file\n"));
                printf(_("      --logfile <path> set an alternate log file\n"));
                printf(_("      --noconfirm      do not ask for any confirmation\n"));
                printf(_("      --noprogressbar  do not show a progress bar when downloading files\n"));
                printf(_("      --noscriptlet    do not execute the install scriptlet if one exists\n"));
                printf(_("  -v, --verbose        be verbose\n"));
                printf(_("      --debug          display debug messages\n"));
                printf(_("  -r, --root <path>    set an alternate installation root\n"));
                printf(_("  -b, --dbpath <path>  set an alternate database location\n"));
                printf(_("      --cachedir <dir> set an alternate package cache location\n"));
        }
}

/** Output pacman version and copyright.
 */
static void version(void)
{
        printf("\n");
        printf(" .--.                  Pacman v%s - libalpm v%s\n", PACKAGE_VERSION, alpm_version());
        printf("/ _.-' .-.  .-.  .-.   Copyright (C) 2006-2009 Pacman Development Team\n");
        printf("\\  '-. '-'  '-'  '-'   Copyright (C) 2002-2006 Judd Vinet\n");
        printf(" '--'\n");
        printf(_("                       This program may be freely redistributed under\n"
                 "                       the terms of the GNU General Public License.\n"));
        printf("\n");
}

/** Sets up gettext localization. Safe to call multiple times.
 */
/* Inspired by the monotone function localize_monotone. */
#if defined(ENABLE_NLS)
static void localize(void)
{
        static int init = 0;
        if (!init) {
                setlocale(LC_ALL, "");
                bindtextdomain(PACKAGE, LOCALEDIR);
                textdomain(PACKAGE);
                init = 1;
        }
}
#endif

/** Set user agent environment variable.
 */
static void setuseragent(void)
{
        char agent[101];
        struct utsname un;

        uname(&un);
        snprintf(agent, 100, "pacman/%s (%s %s) libalpm/%s",
                        PACKAGE_VERSION, un.sysname, un.machine, alpm_version());
        setenv("HTTP_USER_AGENT", agent, 0);
}

/** Free the resources.
 *
 * @param ret the return value
 */
static void cleanup(int ret) {
        /* free alpm library resources */
        if(alpm_release() == -1) {
                pm_printf(PM_LOG_ERROR, alpm_strerrorlast());
        }

        /* free memory */
        FREELIST(pm_targets);
        if(config) {
                config_free(config);
                config = NULL;
        }

        exit(ret);
}

/** Write function that correctly handles EINTR.
 */
static ssize_t xwrite(int fd, const void *buf, size_t count)
{
        ssize_t ret;
        while((ret = write(fd, buf, count)) == -1 && errno == EINTR);
        return(ret);
}

/** Catches thrown signals. Performs necessary cleanup to ensure database is
 * in a consistant state.
 * @param signum the thrown signal
 */
static RETSIGTYPE handler(int signum)
{
        int out = fileno(stdout);
        int err = fileno(stderr);
        if(signum == SIGSEGV) {
                const char *msg1 = "error: segmentation fault\n";
                const char *msg2 = "Internal pacman error: Segmentation fault.\n"
                        "Please submit a full bug report with --debug if appropriate.\n";
                /* write a error message to out, the rest to err */
                xwrite(out, msg1, strlen(msg1));
                xwrite(err, msg2, strlen(msg2));
                exit(signum);
        } else if((signum == SIGINT)) {
                const char *msg = "\nInterrupt signal received\n";
                xwrite(err, msg, strlen(msg));
                if(alpm_trans_interrupt() == 0) {
                        /* a transaction is being interrupted, don't exit pacman yet. */
                        return;
                }
                /* no commiting transaction, we can release it now and then exit pacman */
                alpm_trans_release();
                /* output a newline to be sure we clear any line we may be on */
                xwrite(out, "\n", 1);
        }
        cleanup(signum);
}

/** Sets all libalpm required paths in one go. Called after the command line
 * and inital config file parsing. Once this is complete, we can see if any
 * paths were defined. If a rootdir was defined and nothing else, we want all
 * of our paths to live under the rootdir that was specified. Safe to call
 * multiple times (will only do anything the first time).
 */
static void setlibpaths(void)
{
        static int init = 0;
        if (!init) {
                int ret = 0;

                pm_printf(PM_LOG_DEBUG, "setlibpaths() called\n");
                /* Configure root path first. If it is set and dbpath/logfile were not
                 * set, then set those as well to reside under the root. */
                if(config->rootdir) {
                        char path[PATH_MAX];
                        ret = alpm_option_set_root(config->rootdir);
                        if(ret != 0) {
                                pm_printf(PM_LOG_ERROR, _("problem setting rootdir '%s' (%s)\n"),
                                                config->rootdir, alpm_strerrorlast());
                                cleanup(ret);
                        }
                        if(!config->dbpath) {
                                /* omit leading slash from our static DBPATH, root handles it */
                                snprintf(path, PATH_MAX, "%s%s", alpm_option_get_root(), DBPATH + 1);
                                config->dbpath = strdup(path);
                        }
                        if(!config->logfile) {
                                /* omit leading slash from our static LOGFILE path, root handles it */
                                snprintf(path, PATH_MAX, "%s%s", alpm_option_get_root(), LOGFILE + 1);
                                config->logfile = strdup(path);
                        }
                }
                /* Set other paths if they were configured. Note that unless rootdir
                 * was left undefined, these two paths (dbpath and logfile) will have
                 * been set locally above, so the if cases below will now trigger. */
                if(config->dbpath) {
                        ret = alpm_option_set_dbpath(config->dbpath);
                        if(ret != 0) {
                                pm_printf(PM_LOG_ERROR, _("problem setting dbpath '%s' (%s)\n"),
                                                config->dbpath, alpm_strerrorlast());
                                cleanup(ret);
                        }
                }
                if(config->logfile) {
                        ret = alpm_option_set_logfile(config->logfile);
                        if(ret != 0) {
                                pm_printf(PM_LOG_ERROR, _("problem setting logfile '%s' (%s)\n"),
                                                config->logfile, alpm_strerrorlast());
                                cleanup(ret);
                        }
                }

                /* add a default cachedir if one wasn't specified */
                if(alpm_option_get_cachedirs() == NULL) {
                        alpm_option_add_cachedir(CACHEDIR);
                }
                init = 1;
        }
}

/** Parse command-line arguments for each operation.
 * @param argc argc
 * @param argv argv
 * @return 0 on success, 1 on error
 */
static int parseargs(int argc, char *argv[])
{
        int opt;
        int option_index = 0;
        static struct option opts[] =
        {
                {"query",      no_argument,       0, 'Q'},
                {"remove",     no_argument,       0, 'R'},
                {"sync",       no_argument,       0, 'S'},
                {"deptest",    no_argument,       0, 'T'}, /* used by makepkg */
                {"upgrade",    no_argument,       0, 'U'},
                {"version",    no_argument,       0, 'V'},
                {"dbpath",     required_argument, 0, 'b'},
                {"cascade",    no_argument,       0, 'c'},
                {"changelog",  no_argument,       0, 'c'},
                {"clean",      no_argument,       0, 'c'},
                {"nodeps",     no_argument,       0, 'd'},
                {"deps",       no_argument,       0, 'd'},
                {"explicit",   no_argument,       0, 'e'},
                {"force",      no_argument,       0, 'f'},
                {"groups",     no_argument,       0, 'g'},
                {"help",       no_argument,       0, 'h'},
                {"info",       no_argument,       0, 'i'},
                {"dbonly",     no_argument,       0, 'k'},
                {"check",      no_argument,       0, 'k'},
                {"list",       no_argument,       0, 'l'},
                {"foreign",    no_argument,       0, 'm'},
                {"nosave",     no_argument,       0, 'n'},
                {"owns",       no_argument,       0, 'o'},
                {"file",       no_argument,       0, 'p'},
                {"print-uris", no_argument,       0, 'p'},
                {"quiet",      no_argument,       0, 'q'},
                {"root",       required_argument, 0, 'r'},
                {"recursive",  no_argument,       0, 's'},
                {"search",     no_argument,       0, 's'},
                {"unrequired", no_argument,       0, 't'},
                {"upgrades",   no_argument,       0, 'u'},
                {"sysupgrade", no_argument,       0, 'u'},
                {"unneeded",   no_argument,       0, 'u'},
                {"verbose",    no_argument,       0, 'v'},
                {"downloadonly", no_argument,     0, 'w'},
                {"refresh",    no_argument,       0, 'y'},
                {"noconfirm",  no_argument,       0, 1000},
                {"config",     required_argument, 0, 1001},
                {"ignore",     required_argument, 0, 1002},
                {"debug",      optional_argument, 0, 1003},
                {"noprogressbar", no_argument,    0, 1004},
                {"noscriptlet", no_argument,      0, 1005},
                {"cachedir",   required_argument, 0, 1007},
                {"asdeps",     no_argument,       0, 1008},
                {"logfile",    required_argument, 0, 1009},
                {"ignoregroup", required_argument, 0, 1010},
                {"needed",     no_argument,       0, 1011},
                {"asexplicit",     no_argument,   0, 1012},
                {0, 0, 0, 0}
        };

        while((opt = getopt_long(argc, argv, "RUFQSTr:b:vkhscVfmnoldepqituwygz", opts, &option_index))) {
                alpm_list_t *list = NULL, *item = NULL; /* lists for splitting strings */

                if(opt < 0) {
                        break;
                }
                switch(opt) {
                        case 0: break;
                        case 1000: config->noconfirm = 1; break;
                        case 1001:
                                if(config->configfile) {
                                        free(config->configfile);
                                }
                                config->configfile = strndup(optarg, PATH_MAX);
                                break;
                        case 1002:
                                list = strsplit(optarg, ',');
                                for(item = list; item; item = alpm_list_next(item)) {
                                        alpm_option_add_ignorepkg((char *)alpm_list_getdata(item));
                                }
                                FREELIST(list);
                                break;
                        case 1003:
                                /* debug levels are made more 'human readable' than using a raw logmask
                                 * here, error and warning are set in config_new, though perhaps a
                                 * --quiet option will remove these later */
                                if(optarg) {
                                        unsigned short debug = atoi(optarg);
                                        switch(debug) {
                                                case 2:
                                                        config->logmask |= PM_LOG_FUNCTION; /* fall through */
                                                case 1:
                                                        config->logmask |= PM_LOG_DEBUG;
                                                        break;
                                                default:
                                                  pm_printf(PM_LOG_ERROR, _("'%s' is not a valid debug level\n"),
                                                                        optarg);
                                                        return(1);
                                        }
                                } else {
                                        config->logmask |= PM_LOG_DEBUG;
                                }
                                /* progress bars get wonky with debug on, shut them off */
                                config->noprogressbar = 1;
                                break;
                        case 1004: config->noprogressbar = 1; break;
                        case 1005: config->flags |= PM_TRANS_FLAG_NOSCRIPTLET; break;
                        case 1007:
                                if(alpm_option_add_cachedir(optarg) != 0) {
                                        pm_printf(PM_LOG_ERROR, _("problem adding cachedir '%s' (%s)\n"),
                                                        optarg, alpm_strerrorlast());
                                        return(1);
                                }
                                break;
                        case 1008:
                                config->flags |= PM_TRANS_FLAG_ALLDEPS;
                                break;
                        case 1009:
                                config->logfile = strdup(optarg);
                                break;
                        case 1010:
                                list = strsplit(optarg, ',');
                                for(item = list; item; item = alpm_list_next(item)) {
                                        alpm_option_add_ignoregrp((char *)alpm_list_getdata(item));
                                }
                                FREELIST(list);
                                break;
                        case 1011: config->flags |= PM_TRANS_FLAG_NEEDED; break;
                        case 1012:
                                config->flags |= PM_TRANS_FLAG_ALLEXPLICIT;
                                break;
                        case 'Q': config->op = (config->op != PM_OP_MAIN ? 0 : PM_OP_QUERY); break;
                        case 'R': config->op = (config->op != PM_OP_MAIN ? 0 : PM_OP_REMOVE); break;
                        case 'S': config->op = (config->op != PM_OP_MAIN ? 0 : PM_OP_SYNC); break;
                        case 'T': config->op = (config->op != PM_OP_MAIN ? 0 : PM_OP_DEPTEST); break;
                        case 'U': config->op = (config->op != PM_OP_MAIN ? 0 : PM_OP_UPGRADE); break;
                        case 'V': config->version = 1; break;
                        case 'b':
                                config->dbpath = strdup(optarg);
                                break;
                        case 'c':
                                (config->op_s_clean)++;
                                config->flags |= PM_TRANS_FLAG_CASCADE;
                                config->op_q_changelog = 1;
                                break;
                        case 'd':
                                config->op_q_deps = 1;
                                config->flags |= PM_TRANS_FLAG_NODEPS;
                                break;
                        case 'e':
                                config->op_q_explicit = 1;
                                break;
                        case 'f': config->flags |= PM_TRANS_FLAG_FORCE; break;
                        case 'g': (config->group)++; break;
                        case 'h': config->help = 1; break;
                        case 'i': (config->op_q_info)++; (config->op_s_info)++; break;
                        case 'k':
                                config->flags |= PM_TRANS_FLAG_DBONLY;
                                config->op_q_check = 1;
                                break;
                        case 'l': config->op_q_list = 1; break;
                        case 'm': config->op_q_foreign = 1; break;
                        case 'n': config->flags |= PM_TRANS_FLAG_NOSAVE; break;
                        case 'o': config->op_q_owns = 1; break;
                        case 'p':
                                config->op_q_isfile = 1;
                                config->op_s_printuris = 1;
                                config->flags |= PM_TRANS_FLAG_NOCONFLICTS;
                                config->flags |= PM_TRANS_FLAG_NOLOCK;
                                break;
                        case 'q':
                                config->quiet = 1;
                                break;
                        case 'r':
                                config->rootdir = strdup(optarg);
                                break;
                        case 's':
                                config->op_s_search = 1;
                                config->op_q_search = 1;
                                if(config->flags & PM_TRANS_FLAG_RECURSE) {
                                        config->flags |= PM_TRANS_FLAG_RECURSEALL;
                                } else {
                                        config->flags |= PM_TRANS_FLAG_RECURSE;
                                }
                                break;
                        case 't':
                                config->op_q_unrequired = 1;
                                break;
                        case 'u':
                                (config->op_s_upgrade)++;
                                config->op_q_upgrade = 1;
                                config->flags |= PM_TRANS_FLAG_UNNEEDED;
                                break;
                        case 'v': (config->verbose)++; break;
                        case 'w':
                                config->op_s_downloadonly = 1;
                                config->flags |= PM_TRANS_FLAG_DOWNLOADONLY;
                                config->flags |= PM_TRANS_FLAG_NOCONFLICTS;
                                break;
                        case 'y': (config->op_s_sync)++; break;
                        case '?': return(1);
                        default: return(1);
                }
        }

        if(config->op == 0) {
                pm_printf(PM_LOG_ERROR, _("only one operation may be used at a time\n"));
                return(1);
        }

        if(config->help) {
                usage(config->op, mbasename(argv[0]));
                return(2);
        }
        if(config->version) {
                version();
                return(2);
        }

        while(optind < argc) {
                /* add the target to our target array */
                pm_targets = alpm_list_add(pm_targets, strdup(argv[optind]));
                optind++;
        }

        return(0);
}

/* helper for being used with setrepeatingoption */
static void option_add_holdpkg(const char *name) {
        config->holdpkg = alpm_list_add(config->holdpkg, strdup(name));
}

/* helper for being used with setrepeatingoption */
static void option_add_syncfirst(const char *name) {
        config->syncfirst = alpm_list_add(config->syncfirst, strdup(name));
}

/** Add repeating options such as NoExtract, NoUpgrade, etc to libalpm
 * settings. Refactored out of the parseconfig code since all of them did
 * the exact same thing and duplicated code.
 * @param ptr a pointer to the start of the multiple options
 * @param option the string (friendly) name of the option, used for messages
 * @param optionfunc a function pointer to an alpm_option_add_* function
 */
static void setrepeatingoption(const char *ptr, const char *option,
                void (*optionfunc)(const char*))
{
        char *p = (char*)ptr;
        char *q;

        while((q = strchr(p, ' '))) {
                *q = '\0';
                (*optionfunc)(p);
                pm_printf(PM_LOG_DEBUG, "config: %s: %s\n", option, p);
                p = q;
                p++;
        }
        (*optionfunc)(p);
        pm_printf(PM_LOG_DEBUG, "config: %s: %s\n", option, p);
}

static char *get_filename(const char *url) {
        char *filename = strrchr(url, '/');
        if(filename != NULL) {
                filename++;
        }
        return(filename);
}

static char *get_destfile(const char *path, const char *filename) {
        char *destfile;
        /* len = localpath len + filename len + null */
        int len = strlen(path) + strlen(filename) + 1;
        destfile = calloc(len, sizeof(char));
        snprintf(destfile, len, "%s%s", path, filename);

        return(destfile);
}

static char *get_tempfile(const char *path, const char *filename) {
        char *tempfile;
        /* len = localpath len + filename len + '.part' len + null */
        int len = strlen(path) + strlen(filename) + 6;
        tempfile = calloc(len, sizeof(char));
        snprintf(tempfile, len, "%s%s.part", path, filename);

        return(tempfile);
}

/** External fetch callback */
int download_with_xfercommand(const char *url, const char *localpath,
                time_t mtimeold, time_t *mtimenew) {
        int ret = 0;
        int retval;
        int usepart = 0;
        char *ptr1, *ptr2;
        char origCmd[PATH_MAX];
        char parsedCmd[PATH_MAX] = "";
        char cwd[PATH_MAX];
        char *destfile, *tempfile, *filename;

        if(!config->xfercommand) {
                return -1;
        }

        filename = get_filename(url);
        if(!filename) {
                return -1;
        }
        destfile = get_destfile(localpath, filename);
        tempfile = get_tempfile(localpath, filename);

        strncpy(origCmd, config->xfercommand, sizeof(origCmd));
        /* replace all occurrences of %o with fn.part */
        ptr1 = origCmd;
        while((ptr2 = strstr(ptr1, "%o"))) {
                usepart = 1;
                ptr2[0] = '\0';
                strcat(parsedCmd, ptr1);
                strcat(parsedCmd, tempfile);
                ptr1 = ptr2 + 2;
        }
        strcat(parsedCmd, ptr1);
        /* replace all occurrences of %u with the download URL */
        strncpy(origCmd, parsedCmd, sizeof(origCmd));
        parsedCmd[0] = '\0';
        ptr1 = origCmd;
        while((ptr2 = strstr(ptr1, "%u"))) {
                ptr2[0] = '\0';
                strcat(parsedCmd, ptr1);
                strcat(parsedCmd, url);
                ptr1 = ptr2 + 2;
        }
        strcat(parsedCmd, ptr1);
        /* cwd to the download directory */
        getcwd(cwd, PATH_MAX);
        if(chdir(localpath)) {
                pm_printf(PM_LOG_WARNING, "could not chdir to %s\n", localpath);
                ret = -1;
                goto cleanup;
        }
        /* execute the parsed command via /bin/sh -c */
        pm_printf(PM_LOG_DEBUG, "running command: %s\n", parsedCmd);
        retval = system(parsedCmd);

        if(retval == -1) {
                pm_printf(PM_LOG_WARNING, "running XferCommand: fork failed!\n");
                ret = -1;
        } else if(retval != 0) {
                /* download failed */
                pm_printf(PM_LOG_DEBUG, "XferCommand command returned non-zero status "
                                "code (%d)\n", retval);
                ret = -1;
        } else {
                /* download was successful */
                if(usepart) {
                        rename(tempfile, destfile);
                }
                ret = 0;
        }

cleanup:
        chdir(cwd);
        if(ret == -1) {
                /* hack to let an user the time to cancel a download */
                sleep(2);
        }
        free(destfile);
        free(tempfile);

        return(ret);
}

/* The real parseconfig. Called with a null section argument by the publicly
 * visible parseconfig so we can recall from within ourself on an include */
static int _parseconfig(const char *file, const char *givensection,
                        pmdb_t * const givendb)
{
        FILE *fp = NULL;
        char line[PATH_MAX+1];
        int linenum = 0;
        char *ptr, *section = NULL;
        pmdb_t *db = NULL;
        int ret = 0;

        pm_printf(PM_LOG_DEBUG, "config: attempting to read file %s\n", file);
        fp = fopen(file, "r");
        if(fp == NULL) {
                pm_printf(PM_LOG_ERROR, _("config file %s could not be read.\n"), file);
                return(1);
        }

        /* if we are passed a section, use it as our starting point */
        if(givensection != NULL) {
                section = strdup(givensection);
        }
        /* if we are passed a db, use it as our starting point */
        if(givendb != NULL) {
                db = givendb;
        }

        while(fgets(line, PATH_MAX, fp)) {
                linenum++;
                strtrim(line);

                /* ignore whole line and end of line comments */
                if(strlen(line) == 0 || line[0] == '#') {
                        continue;
                }
                if((ptr = strchr(line, '#'))) {
                        *ptr = '\0';
                }

                if(line[0] == '[' && line[strlen(line)-1] == ']') {
                        /* new config section, skip the '[' */
                        ptr = line;
                        ptr++;
                        if(section) {
                                free(section);
                        }
                        section = strdup(ptr);
                        section[strlen(section)-1] = '\0';
                        pm_printf(PM_LOG_DEBUG, "config: new section '%s'\n", section);
                        if(!strlen(section)) {
                                pm_printf(PM_LOG_ERROR, _("config file %s, line %d: bad section name.\n"),
                                                file, linenum);
                                ret = 1;
                                goto cleanup;
                        }
                        /* if we are not looking at the options section, register a db */
                        if(strcmp(section, "options") != 0) {
                                db = alpm_db_register_sync(section);
                                if(db == NULL) {
                                        pm_printf(PM_LOG_ERROR, _("could not register '%s' database (%s)\n"),
                                                        section, alpm_strerrorlast());
                                        ret = 1;
                                        goto cleanup;
                                }
                        }
                } else {
                        /* directive */
                        char *key;
                        /* strsep modifies the 'line' string: 'key \0 ptr' */
                        key = line;
                        ptr = line;
                        strsep(&ptr, "=");
                        strtrim(key);
                        strtrim(ptr);

                        if(key == NULL) {
                                pm_printf(PM_LOG_ERROR, _("config file %s, line %d: syntax error in config file- missing key.\n"),
                                                file, linenum);
                                ret = 1;
                                goto cleanup;
                        }
                        /* For each directive, compare to the camelcase string. */
                        if(section == NULL) {
                                pm_printf(PM_LOG_ERROR, _("config file %s, line %d: All directives must belong to a section.\n"),
                                                file, linenum);
                                ret = 1;
                                goto cleanup;
                        }
                        if(ptr == NULL && strcmp(section, "options") == 0) {
                                /* directives without settings, all in [options] */
                                if(strcmp(key, "NoPassiveFtp") == 0) {
                                        alpm_option_set_nopassiveftp(1);
                                        pm_printf(PM_LOG_DEBUG, "config: nopassiveftp\n");
                                } else if(strcmp(key, "UseSyslog") == 0) {
                                        alpm_option_set_usesyslog(1);
                                        pm_printf(PM_LOG_DEBUG, "config: usesyslog\n");
                                } else if(strcmp(key, "ILoveCandy") == 0) {
                                        config->chomp = 1;
                                        pm_printf(PM_LOG_DEBUG, "config: chomp\n");
                                } else if(strcmp(key, "ShowSize") == 0) {
                                        config->showsize = 1;
                                        pm_printf(PM_LOG_DEBUG, "config: showsize\n");
                                } else if(strcmp(key, "UseDelta") == 0) {
                                        alpm_option_set_usedelta(1);
                                        pm_printf(PM_LOG_DEBUG, "config: usedelta\n");
                                } else if(strcmp(key, "TotalDownload") == 0) {
                                        config->totaldownload = 1;
                                        pm_printf(PM_LOG_DEBUG, "config: totaldownload\n");
                                } else {
                                        pm_printf(PM_LOG_ERROR, _("config file %s, line %d: directive '%s' not recognized.\n"),
                                                        file, linenum, key);
                                        ret = 1;
                                        goto cleanup;
                                }
                        } else {
                                /* directives with settings */
                                if(strcmp(key, "Include") == 0) {
                                        pm_printf(PM_LOG_DEBUG, "config: including %s\n", ptr);
                                        _parseconfig(ptr, section, db);
                                        /* Ignore include failures... assume non-critical */
                                } else if(strcmp(section, "options") == 0) {
                                        if(strcmp(key, "NoUpgrade") == 0) {
                                                setrepeatingoption(ptr, "NoUpgrade", alpm_option_add_noupgrade);
                                        } else if(strcmp(key, "NoExtract") == 0) {
                                                setrepeatingoption(ptr, "NoExtract", alpm_option_add_noextract);
                                        } else if(strcmp(key, "IgnorePkg") == 0) {
                                                setrepeatingoption(ptr, "IgnorePkg", alpm_option_add_ignorepkg);
                                        } else if(strcmp(key, "IgnoreGroup") == 0) {
                                                setrepeatingoption(ptr, "IgnoreGroup", alpm_option_add_ignoregrp);
                                        } else if(strcmp(key, "HoldPkg") == 0) {
                                                setrepeatingoption(ptr, "HoldPkg", option_add_holdpkg);
                                        } else if(strcmp(key, "SyncFirst") == 0) {
                                                setrepeatingoption(ptr, "SyncFirst", option_add_syncfirst);
                                        } else if(strcmp(key, "DBPath") == 0) {
                                                /* don't overwrite a path specified on the command line */
                                                if(!config->dbpath) {
                                                        config->dbpath = strdup(ptr);
                                                        pm_printf(PM_LOG_DEBUG, "config: dbpath: %s\n", ptr);
                                                }
                                        } else if(strcmp(key, "CacheDir") == 0) {
                                                if(alpm_option_add_cachedir(ptr) != 0) {
                                                        pm_printf(PM_LOG_ERROR, _("problem adding cachedir '%s' (%s)\n"),
                                                                        ptr, alpm_strerrorlast());
                                                        ret = 1;
                                                        goto cleanup;
                                                }
                                                pm_printf(PM_LOG_DEBUG, "config: cachedir: %s\n", ptr);
                                        } else if(strcmp(key, "RootDir") == 0) {
                                                /* don't overwrite a path specified on the command line */
                                                if(!config->rootdir) {
                                                        config->rootdir = strdup(ptr);
                                                        pm_printf(PM_LOG_DEBUG, "config: rootdir: %s\n", ptr);
                                                }
                                        } else if (strcmp(key, "LogFile") == 0) {
                                                if(!config->logfile) {
                                                        config->logfile = strdup(ptr);
                                                        pm_printf(PM_LOG_DEBUG, "config: logfile: %s\n", ptr);
                                                }
                                        } else if (strcmp(key, "XferCommand") == 0) {
                                                config->xfercommand = strdup(ptr);
                                                alpm_option_set_fetchcb(download_with_xfercommand);
                                                pm_printf(PM_LOG_DEBUG, "config: xfercommand: %s\n", ptr);
                                        } else if (strcmp(key, "CleanMethod") == 0) {
                                                if (strcmp(ptr, "KeepInstalled") == 0) {
                                                        config->cleanmethod = PM_CLEAN_KEEPINST;
                                                } else if (strcmp(ptr, "KeepCurrent") == 0) {
                                                        config->cleanmethod = PM_CLEAN_KEEPCUR;
                                                } else {
                                                        pm_printf(PM_LOG_ERROR, _("invalid value for 'CleanMethod' : '%s'\n"), ptr);
                                                        ret = 1;
                                                        goto cleanup;
                                                }
                                                pm_printf(PM_LOG_DEBUG, "config: cleanmethod: %s\n", ptr);
                                        } else {
                                                pm_printf(PM_LOG_ERROR, _("config file %s, line %d: directive '%s' not recognized.\n"),
                                                                file, linenum, key);
                                                ret = 1;
                                                goto cleanup;
                                        }
                                } else if(strcmp(key, "Server") == 0) {
                                        /* let's attempt a replacement for the current repo */
                                        char *server = strreplace(ptr, "$repo", section);

                                        if(alpm_db_setserver(db, server) != 0) {
                                                /* pm_errno is set by alpm_db_setserver */
                                                pm_printf(PM_LOG_ERROR, _("could not add server URL to database '%s': %s (%s)\n"),
                                                                alpm_db_get_name(db), server, alpm_strerrorlast());
                                                free(server);
                                                ret = 1;
                                                goto cleanup;
                                        }

                                        free(server);
                                } else {
                                        pm_printf(PM_LOG_ERROR, _("config file %s, line %d: directive '%s' not recognized.\n"),
                                                        file, linenum, key);
                                        ret = 1;
                                        goto cleanup;
                                }
                        }
                }
        }

cleanup:
        if(fp) {
                fclose(fp);
        }
        if(section){
                free(section);
        }
        /* call setlibpaths here to ensure we have called it at least once */
        setlibpaths();
        pm_printf(PM_LOG_DEBUG, "config: finished parsing %s\n", file);
        return(ret);
}

/** Parse a configuration file.
 * @param file path to the config file.
 * @return 0 on success, non-zero on error
 */
static int parseconfig(const char *file)
{
        /* call the real parseconfig function with a null section & db argument */
        return(_parseconfig(file, NULL, NULL));
}

/** Main function.
 * @param argc argc
 * @param argv argv
 * @return A return code indicating success, failure, etc.
 */
int main(int argc, char *argv[])
{
        int ret = 0;
        struct sigaction new_action, old_action;
#if defined(HAVE_GETEUID) && !defined(CYGWIN)
        /* geteuid undefined in CYGWIN */
        uid_t myuid = geteuid();
#endif

#if defined(PACMAN_DEBUG) && defined(HAVE_MCHECK_H)
        /*setenv("MALLOC_TRACE","pacman.mtrace", 0);*/
        mtrace();
#endif

        /* Set signal handlers */
        /* Set up the structure to specify the new action. */
        new_action.sa_handler = handler;
        sigemptyset(&new_action.sa_mask);
        new_action.sa_flags = 0;

        sigaction(SIGINT, NULL, &old_action);
        if(old_action.sa_handler != SIG_IGN) {
                sigaction(SIGINT, &new_action, NULL);
        }
        sigaction(SIGTERM, NULL, &old_action);
        if(old_action.sa_handler != SIG_IGN) {
                sigaction(SIGTERM, &new_action, NULL);
        }
        sigaction(SIGSEGV, NULL, &old_action);
        if(old_action.sa_handler != SIG_IGN) {
                sigaction(SIGSEGV, &new_action, NULL);
        }

        /* i18n init */
#if defined(ENABLE_NLS)
        localize();
#endif

        /* set user agent for downloading */
        setuseragent();

        /* init config data */
        config = config_new();

        /* disable progressbar if the output is redirected */
        if(!isatty(1)) {
                config->noprogressbar = 1;
        }

        /* initialize library */
        if(alpm_initialize() == -1) {
                pm_printf(PM_LOG_ERROR, _("failed to initialize alpm library (%s)\n"),
                        alpm_strerrorlast());
                cleanup(EXIT_FAILURE);
        }

        /* Setup logging as soon as possible, to print out maximum debugging info */
        alpm_option_set_logcb(cb_log);
        alpm_option_set_dlcb(cb_dl_progress);
        /* define paths to reasonable defaults */
        alpm_option_set_root(ROOTDIR);
        alpm_option_set_dbpath(DBPATH);
        alpm_option_set_logfile(LOGFILE);

        /* Priority of options:
         * 1. command line
         * 2. config file
         * 3. compiled-in defaults
         * However, we have to parse the command line first because a config file
         * location can be specified here, so we need to make sure we prefer these
         * options over the config file coming second.
         */

        /* parse the command line */
        ret = parseargs(argc, argv);
        if(ret != 0) {
                cleanup(ret);
        }

        /* parse the config file */
        ret = parseconfig(config->configfile);
        if(ret != 0) {
                cleanup(ret);
        }

        /* set TotalDownload callback if option enabled */
        if(config->totaldownload) {
                alpm_option_set_totaldlcb(cb_dl_total);
        }

#if defined(HAVE_GETEUID) && !defined(CYGWIN)
        /* check if we have sufficient permission for the requested operation */
        if(myuid > 0 && needs_root()) {
                pm_printf(PM_LOG_ERROR, _("you cannot perform this operation unless you are root.\n"));
                cleanup(EXIT_FAILURE);
        }
#endif

        if(config->verbose > 0) {
                alpm_list_t *i;
                printf("Root      : %s\n", alpm_option_get_root());
                printf("Conf File : %s\n", config->configfile);
                printf("DB Path   : %s\n", alpm_option_get_dbpath());
                printf("Cache Dirs: ");
                for(i = alpm_option_get_cachedirs(); i; i = alpm_list_next(i)) {
                        printf("%s  ", (char*)alpm_list_getdata(i));
                }
                printf("\n");
                printf("Lock File : %s\n", alpm_option_get_lockfile());
                printf("Log File  : %s\n", alpm_option_get_logfile());
                list_display("Targets   :", pm_targets);
        }

        /* Opening local database */
        db_local = alpm_db_register_local();
        if(db_local == NULL) {
                pm_printf(PM_LOG_ERROR, _("could not register 'local' database (%s)\n"),
                        alpm_strerrorlast());
                cleanup(EXIT_FAILURE);
        }

        /* start the requested operation */
        switch(config->op) {
                case PM_OP_REMOVE:
                        ret = pacman_remove(pm_targets);
                        break;
                case PM_OP_UPGRADE:
                        ret = pacman_upgrade(pm_targets);
                        break;
                case PM_OP_QUERY:
                        ret = pacman_query(pm_targets);
                        break;
                case PM_OP_SYNC:
                        ret = pacman_sync(pm_targets);
                        break;
                case PM_OP_DEPTEST:
                        ret = pacman_deptest(pm_targets);
                        break;
                default:
                        pm_printf(PM_LOG_ERROR, _("no operation specified (use -h for help)\n"));
                        ret = EXIT_FAILURE;
        }

        cleanup(ret);
        /* not reached */
        return(EXIT_SUCCESS);
}

/* vim: set ts=2 sw=2 noet: */