Add signature directory as option on libalpm handle

This will serve as the home directory we pass to GPGME when making calls so
we can have a libalpm-utilized keyring.

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

lib/libalpm/alpm.h

@@ -127,6 +127,9 @@ int alpm_option_set_logfile(const char *logfile);
 const char *alpm_option_get_lockfile(void);
 /* no set_lockfile, path is determined from dbpath */
 
+const char *alpm_option_get_signaturedir(void);
+int alpm_option_set_signaturedir(const char *signaturedir);
+
 int alpm_option_get_usesyslog(void);
 void alpm_option_set_usesyslog(int usesyslog);
 

lib/libalpm/handle.c

@@ -84,6 +84,7 @@ void _alpm_handle_free(pmhandle_t *handle)
 	FREE(handle->logfile);
 	FREE(handle->lockfile);
 	FREE(handle->arch);
+	FREE(handle->signaturedir);
 	FREELIST(handle->dbs_sync);
 	FREELIST(handle->noupgrade);
 	FREELIST(handle->noextract);
@@ -174,6 +175,15 @@ const char SYMEXPORT *alpm_option_get_lockfile()
 	return handle->lockfile;
 }
 
+const char SYMEXPORT *alpm_option_get_signaturedir()
+{
+	if (handle == NULL) {
+		pm_errno = PM_ERR_HANDLE_NULL;
+		return NULL;
+	}
+	return handle->signaturedir;
+}
+
 int SYMEXPORT alpm_option_get_usesyslog()
 {
 	if (handle == NULL) {
@@ -460,6 +470,24 @@ int SYMEXPORT alpm_option_set_logfile(const char *logfile)
 	return 0;
 }
 
+int SYMEXPORT alpm_option_set_signaturedir(const char *signaturedir)
+{
+	ALPM_LOG_FUNC;
+
+	if(!signaturedir) {
+		pm_errno = PM_ERR_WRONG_ARGS;
+		return -1;
+	}
+
+	if(handle->signaturedir) {
+		FREE(handle->signaturedir);
+	}
+	handle->signaturedir = strdup(signaturedir);
+
+	_alpm_log(PM_LOG_DEBUG, "option 'signaturedir' = %s\n", handle->signaturedir);
+	return 0;
+}
+
 void SYMEXPORT alpm_option_set_usesyslog(int usesyslog)
 {
 	handle->usesyslog = usesyslog;

lib/libalpm/handle.h

@@ -58,6 +58,7 @@ typedef struct _pmhandle_t {
 	char *dbpath;            /* Base path to pacman's DBs */
 	char *logfile;           /* Name of the log file */
 	char *lockfile;          /* Name of the lock file */
+	char *signaturedir;        /* Directory where GnuPG files are stored */
 	alpm_list_t *cachedirs;  /* Paths to pacman cache directories */
 
 	/* package lists */