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pacman/lib/libalpm/trans.c
Dan McGee cc754bc6e3 libalpm: introduce MALLOC and CALLOC macros 
These macros take the place of the common 4 or 5 line blocks of code we had
in most places that called malloc or calloc. This should reduce some code
duplication and make memory allocation more standard in libalpm.

Highlights:
* Note that the MALLOC macro actually uses calloc, this is just for safety
  so that memory is initialized to 0. This can be easily changed in one
  place.
* One malloc call was completely eliminated- it made more sense to do it
  on the stack.
* The use of RET_ERR in public functions (mainly the alpm_*_new functions)
  was standardized, this makes sense so pm_errno is set.

Signed-off-by: Dan McGee <dan@archlinux.org>
2007-10-29 01:00:52 -05:00

712 lines
18 KiB
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/*
* trans.c
*
* Copyright (c) 2002-2006 by Judd Vinet <jvinet@zeroflux.org>
* Copyright (c) 2005 by Aurelien Foret <orelien@chez.com>
* Copyright (c) 2005 by Christian Hamar <krics@linuxforum.hu>
* Copyright (c) 2005, 2006 by Miklos Vajna <vmiklos@frugalware.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, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
* USA.
*/
#include "config.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <sys/wait.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/statvfs.h>
#include <unistd.h>
#include <errno.h>
/* libalpm */
#include "trans.h"
#include "alpm_list.h"
#include "error.h"
#include "package.h"
#include "util.h"
#include "log.h"
#include "handle.h"
#include "add.h"
#include "remove.h"
#include "sync.h"
#include "alpm.h"
#include "deps.h"
#include "cache.h"
#include "provide.h"
/** \addtogroup alpm_trans Transaction Functions
* @brief Functions to manipulate libalpm transactions
* @{
*/
/** Initialize the transaction.
* @param type type of the transaction
* @param flags flags of the transaction (like nodeps, etc)
* @param event event callback function pointer
* @param conv question callback function pointer
* @param progress progress callback function pointer
* @return 0 on success, -1 on error (pm_errno is set accordingly)
*/
int SYMEXPORT alpm_trans_init(pmtranstype_t type, pmtransflag_t flags,
alpm_trans_cb_event event, alpm_trans_cb_conv conv,
alpm_trans_cb_progress progress)
{
ALPM_LOG_FUNC;
/* Sanity checks */
ASSERT(handle != NULL, RET_ERR(PM_ERR_HANDLE_NULL, -1));
ASSERT(handle->trans == NULL, RET_ERR(PM_ERR_TRANS_NOT_NULL, -1));
/* lock db */
handle->lckfd = _alpm_lckmk();
if(handle->lckfd == -1) {
RET_ERR(PM_ERR_HANDLE_LOCK, -1);
}
handle->trans = _alpm_trans_new();
if(handle->trans == NULL) {
RET_ERR(PM_ERR_MEMORY, -1);
}
return(_alpm_trans_init(handle->trans, type, flags, event, conv, progress));
}
/** Search for packages to upgrade and add them to the transaction.
* @return 0 on success, -1 on error (pm_errno is set accordingly)
*/
int SYMEXPORT alpm_trans_sysupgrade()
{
pmtrans_t *trans;
ALPM_LOG_FUNC;
ASSERT(handle != NULL, RET_ERR(PM_ERR_HANDLE_NULL, -1));
trans = handle->trans;
ASSERT(trans != NULL, RET_ERR(PM_ERR_TRANS_NULL, -1));
ASSERT(trans->state == STATE_INITIALIZED, RET_ERR(PM_ERR_TRANS_NOT_INITIALIZED, -1));
ASSERT(trans->type == PM_TRANS_TYPE_SYNC, RET_ERR(PM_ERR_TRANS_TYPE, -1));
return(_alpm_trans_sysupgrade(trans));
}
/** Add a target to the transaction.
* @param target the name of the target to add
* @return 0 on success, -1 on error (pm_errno is set accordingly)
*/
int SYMEXPORT alpm_trans_addtarget(char *target)
{
pmtrans_t *trans;
ALPM_LOG_FUNC;
/* Sanity checks */
ASSERT(handle != NULL, RET_ERR(PM_ERR_HANDLE_NULL, -1));
ASSERT(target != NULL && strlen(target) != 0, RET_ERR(PM_ERR_WRONG_ARGS, -1));
trans = handle->trans;
ASSERT(trans != NULL, RET_ERR(PM_ERR_TRANS_NULL, -1));
ASSERT(trans->state == STATE_INITIALIZED, RET_ERR(PM_ERR_TRANS_NOT_INITIALIZED, -1));
return(_alpm_trans_addtarget(trans, target));
}
/** Prepare a transaction.
* @param data the address of an alpm_list where detailed description
* of an error can be dumped (ie. list of conflicting files)
* @return 0 on success, -1 on error (pm_errno is set accordingly)
*/
int SYMEXPORT alpm_trans_prepare(alpm_list_t **data)
{
ALPM_LOG_FUNC;
/* Sanity checks */
ASSERT(handle != NULL, RET_ERR(PM_ERR_HANDLE_NULL, -1));
ASSERT(data != NULL, RET_ERR(PM_ERR_WRONG_ARGS, -1));
ASSERT(handle->trans != NULL, RET_ERR(PM_ERR_TRANS_NULL, -1));
ASSERT(handle->trans->state == STATE_INITIALIZED, RET_ERR(PM_ERR_TRANS_NOT_INITIALIZED, -1));
return(_alpm_trans_prepare(handle->trans, data));
}
/** Commit a transaction.
* @param data the address of an alpm_list where detailed description
* of an error can be dumped (ie. list of conflicting files)
* @return 0 on success, -1 on error (pm_errno is set accordingly)
*/
int SYMEXPORT alpm_trans_commit(alpm_list_t **data)
{
ALPM_LOG_FUNC;
/* Sanity checks */
ASSERT(handle != NULL, RET_ERR(PM_ERR_HANDLE_NULL, -1));
ASSERT(handle->trans != NULL, RET_ERR(PM_ERR_TRANS_NULL, -1));
ASSERT(handle->trans->state == STATE_PREPARED, RET_ERR(PM_ERR_TRANS_NOT_PREPARED, -1));
return(_alpm_trans_commit(handle->trans, data));
}
/** Interrupt a transaction.
* @return 0 on success, -1 on error (pm_errno is set accordingly)
*/
int SYMEXPORT alpm_trans_interrupt()
{
pmtrans_t *trans;
ALPM_LOG_FUNC;
/* Sanity checks */
ASSERT(handle != NULL, RET_ERR(PM_ERR_HANDLE_NULL, -1));
trans = handle->trans;
ASSERT(trans != NULL, RET_ERR(PM_ERR_TRANS_NULL, -1));
ASSERT(trans->state == STATE_COMMITING || trans->state == STATE_INTERRUPTED,
RET_ERR(PM_ERR_TRANS_TYPE, -1));
trans->state = STATE_INTERRUPTED;
return(0);
}
/** Release a transaction.
* @return 0 on success, -1 on error (pm_errno is set accordingly)
*/
int SYMEXPORT alpm_trans_release()
{
pmtrans_t *trans;
ALPM_LOG_FUNC;
/* Sanity checks */
ASSERT(handle != NULL, RET_ERR(PM_ERR_HANDLE_NULL, -1));
trans = handle->trans;
ASSERT(trans != NULL, RET_ERR(PM_ERR_TRANS_NULL, -1));
ASSERT(trans->state != STATE_IDLE, RET_ERR(PM_ERR_TRANS_NULL, -1));
_alpm_trans_free(trans);
handle->trans = NULL;
/* unlock db */
if(handle->lckfd != -1) {
close(handle->lckfd);
handle->lckfd = -1;
}
if(_alpm_lckrm()) {
_alpm_log(PM_LOG_WARNING, _("could not remove lock file %s\n"),
alpm_option_get_lockfile());
alpm_logaction("warning: could not remove lock file %s",
alpm_option_get_lockfile());
}
return(0);
}
/** @} */
pmtrans_t *_alpm_trans_new()
{
pmtrans_t *trans;
ALPM_LOG_FUNC;
CALLOC(trans, 1, sizeof(pmtrans_t), RET_ERR(PM_ERR_MEMORY, NULL));
trans->targets = NULL;
trans->packages = NULL;
trans->skip_add = NULL;
trans->skip_remove = NULL;
trans->type = 0;
trans->flags = 0;
trans->cb_event = NULL;
trans->cb_conv = NULL;
trans->cb_progress = NULL;
trans->state = STATE_IDLE;
return(trans);
}
void _alpm_trans_free(pmtrans_t *trans)
{
ALPM_LOG_FUNC;
if(trans == NULL) {
return;
}
FREELIST(trans->targets);
if(trans->type == PM_TRANS_TYPE_SYNC) {
alpm_list_t *i;
for(i = trans->packages; i; i = alpm_list_next(i)) {
_alpm_sync_free(i->data);
i->data = NULL;
}
FREELIST(trans->packages);
} else {
alpm_list_t *tmp;
for(tmp = trans->packages; tmp; tmp = alpm_list_next(tmp)) {
_alpm_pkg_free(tmp->data);
tmp->data = NULL;
}
}
trans->packages = NULL;
FREELIST(trans->skip_add);
FREELIST(trans->skip_remove);
FREE(trans);
}
int _alpm_trans_init(pmtrans_t *trans, pmtranstype_t type, pmtransflag_t flags,
alpm_trans_cb_event event, alpm_trans_cb_conv conv,
alpm_trans_cb_progress progress)
{
ALPM_LOG_FUNC;
/* Sanity checks */
ASSERT(trans != NULL, RET_ERR(PM_ERR_TRANS_NULL, -1));
trans->type = type;
trans->flags = flags;
trans->cb_event = event;
trans->cb_conv = conv;
trans->cb_progress = progress;
trans->state = STATE_INITIALIZED;
return(0);
}
int _alpm_trans_sysupgrade(pmtrans_t *trans)
{
ALPM_LOG_FUNC;
/* Sanity checks */
ASSERT(trans != NULL, RET_ERR(PM_ERR_TRANS_NULL, -1));
return(_alpm_sync_sysupgrade(trans, handle->db_local, handle->dbs_sync));
}
/** Add a target to the transaction.
* @param trans the current transaction
* @param target the name of the target to add
* @return 0 on success, -1 on error (pm_errno is set accordingly)
*/
int _alpm_trans_addtarget(pmtrans_t *trans, char *target)
{
ALPM_LOG_FUNC;
/* Sanity checks */
ASSERT(trans != NULL, RET_ERR(PM_ERR_TRANS_NULL, -1));
ASSERT(target != NULL, RET_ERR(PM_ERR_WRONG_ARGS, -1));
if(alpm_list_find_str(trans->targets, target)) {
return(0);
//RET_ERR(PM_ERR_TRANS_DUP_TARGET, -1);
}
switch(trans->type) {
case PM_TRANS_TYPE_ADD:
case PM_TRANS_TYPE_UPGRADE:
if(_alpm_add_loadtarget(trans, handle->db_local, target) == -1) {
/* pm_errno is set by _alpm_add_loadtarget() */
return(-1);
}
break;
case PM_TRANS_TYPE_REMOVE:
case PM_TRANS_TYPE_REMOVEUPGRADE:
if(_alpm_remove_loadtarget(trans, handle->db_local, target) == -1) {
/* pm_errno is set by _alpm_remove_loadtarget() */
return(-1);
}
break;
case PM_TRANS_TYPE_SYNC:
if(_alpm_sync_addtarget(trans, handle->db_local, handle->dbs_sync, target) == -1) {
/* pm_errno is set by _alpm_sync_loadtarget() */
return(-1);
}
break;
}
trans->targets = alpm_list_add(trans->targets, strdup(target));
return(0);
}
int _alpm_trans_prepare(pmtrans_t *trans, alpm_list_t **data)
{
*data = NULL;
ALPM_LOG_FUNC;
/* Sanity checks */
ASSERT(trans != NULL, RET_ERR(PM_ERR_TRANS_NULL, -1));
/* If there's nothing to do, return without complaining */
if(trans->packages == NULL) {
return(0);
}
switch(trans->type) {
case PM_TRANS_TYPE_ADD:
case PM_TRANS_TYPE_UPGRADE:
if(_alpm_add_prepare(trans, handle->db_local, data) == -1) {
/* pm_errno is set by _alpm_add_prepare() */
return(-1);
}
break;
case PM_TRANS_TYPE_REMOVE:
case PM_TRANS_TYPE_REMOVEUPGRADE:
if(_alpm_remove_prepare(trans, handle->db_local, data) == -1) {
/* pm_errno is set by _alpm_remove_prepare() */
return(-1);
}
break;
case PM_TRANS_TYPE_SYNC:
if(_alpm_sync_prepare(trans, handle->db_local, handle->dbs_sync, data) == -1) {
/* pm_errno is set by _alpm_sync_prepare() */
return(-1);
}
break;
}
trans->state = STATE_PREPARED;
return(0);
}
int _alpm_trans_commit(pmtrans_t *trans, alpm_list_t **data)
{
ALPM_LOG_FUNC;
if(data!=NULL)
*data = NULL;
/* Sanity checks */
ASSERT(trans != NULL, RET_ERR(PM_ERR_TRANS_NULL, -1));
/* If there's nothing to do, return without complaining */
if(trans->packages == NULL) {
return(0);
}
trans->state = STATE_COMMITING;
switch(trans->type) {
case PM_TRANS_TYPE_ADD:
case PM_TRANS_TYPE_UPGRADE:
if(_alpm_add_commit(trans, handle->db_local) == -1) {
/* pm_errno is set by _alpm_add_commit() */
return(-1);
}
break;
case PM_TRANS_TYPE_REMOVE:
case PM_TRANS_TYPE_REMOVEUPGRADE:
if(_alpm_remove_commit(trans, handle->db_local) == -1) {
/* pm_errno is set by _alpm_remove_commit() */
return(-1);
}
break;
case PM_TRANS_TYPE_SYNC:
if(_alpm_sync_commit(trans, handle->db_local, data) == -1) {
/* pm_errno is set by _alpm_sync_commit() */
return(-1);
}
break;
}
trans->state = STATE_COMMITED;
return(0);
}
/* A depends on B through n depends <=> A listed in B's requiredby n times
* n == 0 or 1 in almost all cases */
int _alpm_trans_update_depends(pmtrans_t *trans, pmpkg_t *pkg)
{
alpm_list_t *i, *j;
alpm_list_t *depends = NULL;
const char *pkgname;
pmdb_t *localdb;
ALPM_LOG_FUNC;
/* Sanity checks */
ASSERT(trans != NULL, RET_ERR(PM_ERR_TRANS_NULL, -1));
ASSERT(pkg != NULL, RET_ERR(PM_ERR_PKG_INVALID, -1));
pkgname = alpm_pkg_get_name(pkg);
depends = alpm_pkg_get_depends(pkg);
if(depends) {
_alpm_log(PM_LOG_DEBUG, "updating dependency packages 'requiredby' fields for %s-%s\n",
pkgname, pkg->version);
} else {
_alpm_log(PM_LOG_DEBUG, "package has no dependencies, no other packages to update\n");
}
localdb = alpm_option_get_localdb();
for(i = depends; i; i = i->next) {
if(!i->data) {
continue;
}
pmdepend_t* dep = alpm_splitdep(i->data);
if(dep == NULL) {
continue;
}
for(j = _alpm_db_get_pkgcache(localdb); j; j = j->next) {
pmpkg_t *deppkg = j->data;
if(deppkg && alpm_depcmp(deppkg, dep)) {
/* this is cheating... we call this function to populate the package */
alpm_list_t *rqdby = alpm_pkg_get_requiredby(deppkg);
_alpm_log(PM_LOG_DEBUG, "updating 'requiredby' field for package '%s'\n",
alpm_pkg_get_name(deppkg));
if(trans->type == PM_TRANS_TYPE_REMOVE
|| trans->type == PM_TRANS_TYPE_REMOVEUPGRADE) {
void *data = NULL;
rqdby = alpm_list_remove(rqdby, pkgname, _alpm_str_cmp, &data);
FREE(data);
deppkg->requiredby = rqdby;
} else {
rqdby = alpm_list_add(rqdby, strdup(pkgname));
deppkg->requiredby = rqdby;
}
if(_alpm_db_write(localdb, deppkg, INFRQ_DEPENDS)) {
_alpm_log(PM_LOG_ERROR, _("could not update 'requiredby' database entry %s-%s\n"),
alpm_pkg_get_name(deppkg), alpm_pkg_get_version(deppkg));
}
}
}
FREE(dep);
}
return(0);
}
/* A cheap grep for text files, returns 1 if a substring
* was found in the text file fn, 0 if it wasn't
*/
static int grep(const char *fn, const char *needle)
{
FILE *fp;
if((fp = fopen(fn, "r")) == NULL) {
return(0);
}
while(!feof(fp)) {
char line[1024];
fgets(line, 1024, fp);
if(feof(fp)) {
continue;
}
if(strstr(line, needle)) {
fclose(fp);
return(1);
}
}
fclose(fp);
return(0);
}
int _alpm_runscriptlet(const char *root, const char *installfn,
const char *script, const char *ver,
const char *oldver)
{
char scriptfn[PATH_MAX];
char cmdline[PATH_MAX];
char tmpdir[PATH_MAX];
char cwd[PATH_MAX];
char *scriptpath;
struct stat buf;
pid_t pid;
int clean_tmpdir = 0;
int restore_cwd = 0;
int retval = 0;
ALPM_LOG_FUNC;
if(stat(installfn, &buf)) {
/* not found */
_alpm_log(PM_LOG_DEBUG, "scriptlet '%s' not found\n", installfn);
return(0);
}
snprintf(tmpdir, PATH_MAX, "%sbin/sh", root);
if(stat(tmpdir, &buf)) {
/* not found */
_alpm_log(PM_LOG_ERROR, _("No /bin/sh in root dir (%s), aborting scriptlet\n"), root);
return(0);
}
/* creates a directory in $root/tmp/ for copying/extracting the scriptlet */
snprintf(tmpdir, PATH_MAX, "%stmp/", root);
if(stat(tmpdir, &buf)) {
_alpm_makepath(tmpdir);
}
snprintf(tmpdir, PATH_MAX, "%stmp/alpm_XXXXXX", root);
if(mkdtemp(tmpdir) == NULL) {
_alpm_log(PM_LOG_ERROR, _("could not create temp directory\n"));
return(1);
} else {
clean_tmpdir = 1;
}
/* either extract or copy the scriptlet */
snprintf(scriptfn, PATH_MAX, "%s/.INSTALL", tmpdir);
if(!strcmp(script, "pre_upgrade") || !strcmp(script, "pre_install")) {
_alpm_unpack(installfn, tmpdir, ".INSTALL");
} else {
if(_alpm_copyfile(installfn, scriptfn)) {
_alpm_log(PM_LOG_ERROR, _("could not copy tempfile to %s (%s)\n"), scriptfn, strerror(errno));
retval = 1;
goto cleanup;
}
}
/* chop off the root so we can find the tmpdir in the chroot */
scriptpath = scriptfn + strlen(root) - 1;
if(!grep(scriptfn, script)) {
/* script not found in scriptlet file */
goto cleanup;
}
/* save the cwd so we can restore it later */
if(getcwd(cwd, PATH_MAX) == NULL) {
_alpm_log(PM_LOG_ERROR, _("could not get current working directory\n"));
} else {
restore_cwd = 1;
}
/* just in case our cwd was removed in the upgrade operation */
if(chdir(root) != 0) {
_alpm_log(PM_LOG_ERROR, _("could not change directory to %s (%s)\n"), root, strerror(errno));
goto cleanup;
}
_alpm_log(PM_LOG_DEBUG, "executing %s script...\n", script);
if(oldver) {
snprintf(cmdline, PATH_MAX, "source %s %s %s %s",
scriptpath, script, ver, oldver);
} else {
snprintf(cmdline, PATH_MAX, "source %s %s %s",
scriptpath, script, ver);
}
_alpm_log(PM_LOG_DEBUG, "%s\n", cmdline);
/* fork- parent and child each have seperate code blocks below */
pid = fork();
if(pid == -1) {
_alpm_log(PM_LOG_ERROR, _("could not fork a new process (%s)\n"), strerror(errno));
retval = 1;
goto cleanup;
}
if(pid == 0) {
/* this code runs for the child only (the actual chroot/exec) */
_alpm_log(PM_LOG_DEBUG, "chrooting in %s\n", root);
if(chroot(root) != 0) {
_alpm_log(PM_LOG_ERROR, _("could not change the root directory (%s)\n"),
strerror(errno));
exit(1);
}
if(chdir("/") != 0) {
_alpm_log(PM_LOG_ERROR, _("could not change directory to / (%s)\n"),
strerror(errno));
exit(1);
}
umask(0022);
_alpm_log(PM_LOG_DEBUG, "executing \"%s\"\n", cmdline);
execl("/bin/sh", "sh", "-c", cmdline, (char *)NULL);
exit(0);
} else {
/* this code runs for the parent only (wait on the child) */
pid_t retpid;
int status;
retpid = waitpid(pid, &status, 0);
if(retpid == -1) {
_alpm_log(PM_LOG_ERROR, _("call to waitpid failed (%s)\n"),
strerror(errno));
retval = 1;
goto cleanup;
} else {
/* check the return status, make sure it is 0 (success) */
if(WIFEXITED(status)) {
_alpm_log(PM_LOG_DEBUG, "call to waitpid succeeded\n");
if(WEXITSTATUS(status) != 0) {
_alpm_log(PM_LOG_ERROR, _("scriptlet failed to execute correctly\n"));
retval = 1;
}
}
}
}
cleanup:
if(clean_tmpdir && _alpm_rmrf(tmpdir)) {
_alpm_log(PM_LOG_WARNING, _("could not remove tmpdir %s\n"), tmpdir);
}
if(restore_cwd) {
chdir(cwd);
}
return(retval);
}
pmtranstype_t SYMEXPORT alpm_trans_get_type()
{
/* Sanity checks */
ASSERT(handle != NULL, return(-1));
ASSERT(handle->trans != NULL, return(-1));
return handle->trans->type;
}
unsigned int SYMEXPORT alpm_trans_get_flags()
{
/* Sanity checks */
ASSERT(handle != NULL, return(-1));
ASSERT(handle->trans != NULL, return(-1));
return handle->trans->flags;
}
alpm_list_t SYMEXPORT * alpm_trans_get_targets()
{
/* Sanity checks */
ASSERT(handle != NULL, return(NULL));
ASSERT(handle->trans != NULL, return(NULL));
return handle->trans->targets;
}
alpm_list_t SYMEXPORT * alpm_trans_get_pkgs()
{
/* Sanity checks */
ASSERT(handle != NULL, return(NULL));
ASSERT(handle->trans != NULL, return(NULL));
return handle->trans->packages;
}
/* vim: set ts=2 sw=2 noet: */
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