add --list-stores mode

this is useful for verifying the store configuration, and finding the
right mailbox names.

REFMAIL: YaZC3XUTWjyfjgn+@ugly

NEWS

@@ -6,6 +6,8 @@ The old locations remain supported.
 The reference point for relative local paths in the configuration file
 is now the file's containing directory.
 
+The unfiltered list of mailboxes in each Store can be printed now.
+
 [1.4.0]
 
 The 'isync' compatibility wrapper was removed.

src/Makefile.am

@@ -8,7 +8,7 @@ mbsync_SOURCES = \
 	drv_imap.c \
 	drv_maildir.c \
 	sync.c sync_state.c \
-	main.c main_sync.c
+	main.c main_sync.c main_list.c
 noinst_HEADERS = \
 	common.h config.h socket.h \
 	driver.h \

src/config.c

@@ -20,8 +20,6 @@ char FieldDelimiter = ';';
 char FieldDelimiter = ':';
 #endif
 
-static store_conf_t *stores;
-
 char *
 expand_strdup( const char *s, const conffile_t *cfile )
 {

src/driver.c

@@ -7,6 +7,8 @@
 
 #include "driver.h"
 
+store_conf_t *stores;
+
 driver_t *drivers[N_DRIVERS] = { &maildir_driver, &imap_driver };
 
 void

src/driver.h

@@ -31,6 +31,8 @@ typedef struct store_conf {
 	STORE_CONF
 } store_conf_t;
 
+extern store_conf_t *stores;
+
 /* For message->flags */
 // Keep the MESSAGE_FLAGS in sync (grep that)!
 /* The order is according to alphabetical maildir flag sort */

src/main.c

@@ -33,6 +33,7 @@ PACKAGE " " VERSION " - mailbox synchronizer\n"
 " " EXE " [flags] {{channel[:box,...]|group} ...|-a}\n"
 "  -a, --all		operate on all defined channels\n"
 "  -l, --list		list mailboxes instead of syncing them\n"
+"  -ls, --list-stores	raw listing of stores' mailboxes\n"
 "  -n, --new		propagate new messages\n"
 "  -d, --delete		propagate message deletions\n"
 "  -f, --flags		propagate message flag changes\n"
@@ -173,6 +174,8 @@ main( int argc, char **argv )
 					mvars->all = 1;
 				} else if (!strcmp( opt, "list" )) {
 					mvars->list = 1;
+				} else if (!strcmp( opt, "list-stores" )) {
+					mvars->list_stores = 1;
 				} else if (!strcmp( opt, "help" )) {
 					usage( 0 );
 				} else if (!strcmp( opt, "version" )) {
@@ -295,7 +298,10 @@ main( int argc, char **argv )
 			mvars->all = 1;
 			break;
 		case 'l':
-			mvars->list = 1;
+			if (*ochar == 's')
+				mvars->list_stores = 1, ochar++;
+			else
+				mvars->list = 1;
 			break;
 		case 'c':
 			if (oind >= argc) {
@@ -468,6 +474,9 @@ main( int argc, char **argv )
 	if (load_config( config ))
 		return 1;
 
-	sync_chans( mvars, argv + oind );
+	if (mvars->list_stores)
+		list_stores( mvars, argv + oind );
+	else
+		sync_chans( mvars, argv + oind );
 	return mvars->ret;
 }

src/main_list.c

@@ -0,0 +1,188 @@
+// SPDX-FileCopyrightText: 2022 Oswald Buddenhagen <ossi@users.sf.net>
+// SPDX-License-Identifier: GPL-2.0-or-later WITH LicenseRef-isync-GPL-exception
+//
+// mbsync - mailbox synchronizer
+//
+
+#include "main_p.h"
+
+typedef struct store_ent {
+	struct store_ent *next;
+	store_conf_t *conf;
+} store_ent_t;
+
+typedef struct {
+	core_vars_t *cvars;
+	store_conf_t *store;
+	driver_t *drv;
+	store_t *ctx;
+	store_ent_t *storeptr;
+	int cben, done;
+} list_vars_t;
+
+static store_ent_t *
+add_store( store_ent_t ***storeapp, store_conf_t *store )
+{
+	store_ent_t *se = nfzalloc( sizeof(*se) );
+	se->conf = store;
+	**storeapp = se;
+	*storeapp = &se->next;
+	return se;
+}
+
+static void do_list_stores( list_vars_t *lvars );
+static void list_next_store( list_vars_t *lvars );
+
+void
+list_stores( core_vars_t *cvars, char **argv )
+{
+	list_vars_t lvars[1];
+	store_ent_t *strs = NULL, **strapp = &strs;
+	store_conf_t *store;
+
+	memset( lvars, 0, sizeof(*lvars) );
+	lvars->cvars = cvars;
+
+	if (!stores) {
+		fputs( "No stores defined.\n", stderr );
+		cvars->ret = 1;
+		return;
+	}
+
+	if (!*argv) {  // Implicit --all
+		for (store = stores; store; store = store->next)
+			add_store( &strapp, store );
+	} else {
+		for (; *argv; argv++) {
+			for (store = stores; store; store = store->next) {
+				if (!strcmp( store->name, *argv )) {
+					add_store( &strapp, store );
+					goto gotstr;
+				}
+			}
+			error( "No store named '%s' defined.\n", *argv );
+			cvars->ret = 1;
+		  gotstr: ;
+		}
+	}
+	if (cvars->ret)
+		return;
+	lvars->storeptr = strs;
+
+	do_list_stores( lvars );
+	main_loop();
+}
+
+static void
+list_store_bad( void *aux )
+{
+	list_vars_t *lvars = (list_vars_t *)aux;
+
+	lvars->drv->cancel_store( lvars->ctx );
+	lvars->cvars->ret = 1;
+	list_next_store( lvars );
+}
+
+static void
+advance_store( list_vars_t *lvars )
+{
+	store_ent_t *nstr = lvars->storeptr->next;
+	free( lvars->storeptr );
+	lvars->storeptr = nstr;
+}
+
+static void list_store_connected( int sts, void *aux );
+
+static void
+do_list_stores( list_vars_t *lvars )
+{
+	while (lvars->storeptr) {
+		lvars->store = lvars->storeptr->conf;
+		lvars->drv = lvars->store->driver;
+		int st = lvars->drv->get_fail_state( lvars->store );
+		if (st != FAIL_TEMP) {
+			info( "Skipping %sfailed store %s.\n",
+				  (st == FAIL_WAIT) ? "temporarily " : "", lvars->store->name );
+			lvars->cvars->ret = 1;
+			goto next;
+		}
+
+		uint dcaps = lvars->drv->get_caps( NULL );
+		store_t *ctx = lvars->drv->alloc_store( lvars->store, "" );
+		if ((DFlags & DEBUG_DRV) || ((DFlags & FORCEASYNC) && !(dcaps & DRV_ASYNC))) {
+			lvars->drv = &proxy_driver;
+			ctx = proxy_alloc_store( ctx, "" );
+		}
+		lvars->ctx = ctx;
+		lvars->drv->set_bad_callback( ctx, list_store_bad, lvars );
+		info( "Opening store %s...\n", lvars->store->name );
+		lvars->cben = lvars->done = 0;
+		lvars->drv->connect_store( lvars->ctx, list_store_connected, lvars );
+		if (!lvars->done) {
+			lvars->cben = 1;
+			return;
+		}
+
+	  next:
+		advance_store( lvars );
+	}
+	cleanup_drivers();
+}
+
+static void
+list_next_store( list_vars_t *lvars )
+{
+	if (lvars->cben) {
+		advance_store( lvars );
+		do_list_stores( lvars );
+	}
+}
+
+static void
+list_done_store( list_vars_t *lvars )
+{
+	lvars->done = 1;
+	lvars->drv->free_store( lvars->ctx );
+	list_next_store( lvars );
+}
+
+static void list_store_listed( int sts, string_list_t *boxes, void *aux );
+
+static void
+list_store_connected( int sts, void *aux )
+{
+	list_vars_t *lvars = (list_vars_t *)aux;
+
+	switch (sts) {
+	case DRV_CANCELED:
+		return;
+	case DRV_OK:
+		lvars->drv->list_store( lvars->ctx, LIST_INBOX | LIST_PATH_MAYBE, list_store_listed, lvars );
+		break;
+	default:
+		lvars->cvars->ret = 1;
+		list_done_store( lvars );
+		break;
+	}
+}
+
+static void
+list_store_listed( int sts, string_list_t *boxes, void *aux )
+{
+	list_vars_t *lvars = (list_vars_t *)aux;
+	string_list_t *box;
+
+	switch (sts) {
+	case DRV_CANCELED:
+		return;
+	case DRV_OK:
+		printf( "===== %s:\n", lvars->ctx->conf->name );
+		for (box = boxes; box; box = box->next)
+			puts( box->string );
+		break;
+	default:
+		lvars->cvars->ret = 1;
+		break;
+	}
+	list_done_store( lvars );
+}

src/main_p.h

@@ -20,5 +20,6 @@ typedef struct {
 } core_vars_t;
 
 void sync_chans( core_vars_t *cvars, char **argv );
+void list_stores( core_vars_t *cvars, char **argv );
 
 #endif

src/mbsync.1

@@ -11,6 +11,8 @@ mbsync - synchronize IMAP4 and Maildir mailboxes
 .
 .SH SYNOPSIS
 \fBmbsync\fR [\fIoptions\fR ...] {{\fIchannel\fR[\fB:\fIbox\fR[{\fB,\fR|\fB\\n\fR}...]]|\fIgroup\fR} ...|\fB-a\fR}
+.br
+\fBmbsync\fR --list-stores [\fIoptions\fR ...] [\fIstore\fR} ...]
 .
 .SH DESCRIPTION
 \fBmbsync\fR is a command line application which synchronizes mailboxes;
@@ -43,6 +45,13 @@ command line are ignored.
 Don't synchronize anything, but list all mailboxes in the selected Channels
 and exit.
 .TP
+\fB-ls\fR, \fB--list-stores\fR
+Don't synchronize anything, but list all mailboxes in the selected Stores
+and exit.
+If no Stores are specified, all configured ones are listed.
+These are raw Store contents, not filtered by any Channel's \fBPatterns\fR.
+This option may be used to verify each Store's configuration.
+.TP
 \fB-C\fR[\fBf\fR][\fBn\fR], \fB--create\fR[\fB-far\fR|\fB-near\fR]
 Override any \fBCreate\fR options from the config file. See below.
 .TP