Add configuration option to control disk space checking

Disk space checking is likely to be an unnecessary bottleneck to
people with reasonable partition sizes so add a configuration option
to allow it to be disabled/enabled as wanted.

Signed-off-by: Allan McRae <allan@archlinux.org>
Signed-off-by: Dan McGee <dan@archlinux.org>

doc/pacman.conf.5.txt

@@ -162,6 +162,10 @@ Options
 	than the percent of each individual download target. The progress
 	bar is still based solely on the current file download.
 
+*CheckSpace*::
+	Performs an approximate check for adequate available disk space before
+	installing packages.
+
 Repository Sections
 -------------------
 Each repository section defines a section name and at least one location where

etc/pacman.conf.in

@@ -33,6 +33,7 @@ Architecture = auto
 #ShowSize
 #UseDelta
 #TotalDownload
+#CheckSpace
 
 #
 # REPOSITORIES

lib/libalpm/alpm.h

@@ -155,6 +155,9 @@ void alpm_option_set_arch(const char *arch);
 int alpm_option_get_usedelta();
 void alpm_option_set_usedelta(int usedelta);
 
+int alpm_option_get_checkspace();
+void alpm_option_set_checkspace(int checkspace);
+
 pmdb_t *alpm_option_get_localdb();
 alpm_list_t *alpm_option_get_syncdbs();
 

lib/libalpm/handle.c

@@ -232,6 +232,15 @@ int SYMEXPORT alpm_option_get_usedelta()
 	return handle->usedelta;
 }
 
+int SYMEXPORT alpm_option_get_checkspace()
+{
+	if (handle == NULL) {
+		pm_errno = PM_ERR_HANDLE_NULL;
+		return -1;
+	}
+	return handle->checkspace;
+}
+
 pmdb_t SYMEXPORT *alpm_option_get_localdb()
 {
 	if (handle == NULL) {
@@ -550,4 +559,9 @@ void SYMEXPORT alpm_option_set_usedelta(int usedelta)
 	handle->usedelta = usedelta;
 }
 
+void SYMEXPORT alpm_option_set_checkspace(int checkspace)
+{
+	handle->checkspace = checkspace;
+}
+
 /* vim: set ts=2 sw=2 noet: */

lib/libalpm/handle.h

@@ -60,6 +60,7 @@ typedef struct _pmhandle_t {
 	int usesyslog;    /* Use syslog instead of logfile? */ /* TODO move to frontend */
 	char *arch;       /* Architecture of packages we should allow */
 	int usedelta;     /* Download deltas if possible */
+	int checkspace;   /* Check disk space before installing */
 } pmhandle_t;
 
 /* global handle variable */

lib/libalpm/sync.c

@@ -998,11 +998,13 @@ int _alpm_sync_commit(pmtrans_t *trans, pmdb_t *db_local, alpm_list_t **data)
 	}
 
 	/* check available disk space */
+	if(handle->checkspace) {
 		_alpm_log(PM_LOG_DEBUG, "checking available disk space\n");
 		if(_alpm_check_diskspace(trans, handle->db_local) == -1) {
 			_alpm_log(PM_LOG_ERROR, _("not enough free disk space\n"));
 			goto error;
 		}
+	}
 
 	/* remove conflicting and to-be-replaced packages */
 	if(replaces) {

src/pacman/pacman.c

@@ -956,6 +956,8 @@ static int _parse_options(char *key, char *value)
 		} else if(strcmp(key, "TotalDownload") == 0) {
 			config->totaldownload = 1;
 			pm_printf(PM_LOG_DEBUG, "config: totaldownload\n");
+		} else if(strcmp(key, "CheckSpace") == 0) {
+			alpm_option_set_checkspace(1);
 		} else {
 			pm_printf(PM_LOG_ERROR, _("directive '%s' without value not recognized\n"), key);
 			return(1);