re-interpret relative local paths in config file

this makes config+data file "sets" relocatable, which is useful for
testing.

this is technically a gratuitous backwards incompatible behavior
change, but to the degree that anyone uses relative paths at all, they
almost certainly rely on PWD being set up such that they won't see a
difference.

NEWS

@@ -3,6 +3,9 @@
 Changed default config & state locations to follow the XDG basedir spec.
 The old locations remain supported.
 
+The reference point for relative local paths in the configuration file
+is now the file's containing directory.
+
 [1.4.0]
 
 The 'isync' compatibility wrapper was removed.

src/config.c

@@ -23,7 +23,7 @@ char FieldDelimiter = ':';
 static store_conf_t *stores;
 
 char *
-expand_strdup( const char *s )
+expand_strdup( const char *s, const conffile_t *cfile )
 {
 	struct passwd *pw;
 	const char *p, *q;
@@ -51,6 +51,9 @@ expand_strdup( const char *s )
 		}
 		nfasprintf( &r, "%s%s", q, p ? p : "" );
 		return r;
+	} else if (*s != '/') {
+		nfasprintf( &r, "%.*s%s", cfile->path_len, cfile->file, s );
+		return r;
 	} else {
 		return nfstrdup( s );
 	}
@@ -220,7 +223,7 @@ getopt_helper( conffile_t *cfile, int *cops, channel_conf_t *conf )
 		} while ((arg = get_arg( cfile, ARG_OPTIONAL, NULL )));
 		conf->ops[F] |= XOP_HAVE_TYPE;
 	} else if (!strcasecmp( "SyncState", cfile->cmd )) {
-		conf->sync_state = expand_strdup( cfile->val );
+		conf->sync_state = !strcmp( cfile->val, "*" ) ? "*" : expand_strdup( cfile->val, cfile );
 	} else if (!strcasecmp( "CopyArrivalDate", cfile->cmd )) {
 		conf->use_internal_date = parse_bool( cfile );
 	} else if (!strcasecmp( "MaxMessages", cfile->cmd )) {
@@ -354,24 +357,34 @@ load_config( const char *where )
 	char buf[1024];
 
 	if (!where) {
+		int path_len, path_len2;
 		const char *config_home = getenv( "XDG_CONFIG_HOME" );
 		if (config_home)
-			nfsnprintf( path, sizeof(path), "%s/isyncrc", config_home );
+			nfsnprintf( path, sizeof(path), "%s/%nisyncrc", config_home, &path_len );
 		else
-			nfsnprintf( path, sizeof(path), "%s/.config/isyncrc", Home );
-		nfsnprintf( path2, sizeof(path2), "%s/.mbsyncrc", Home );
+			nfsnprintf( path, sizeof(path), "%s/.config/%nisyncrc", Home, &path_len );
+		nfsnprintf( path2, sizeof(path2), "%s/%n.mbsyncrc", Home, &path_len2 );
 		struct stat st;
 		int ex = !lstat( path, &st );
 		int ex2 = !lstat( path2, &st );
 		if (ex2 && !ex) {
 			cfile.file = path2;
+			cfile.path_len = path_len2;
 		} else {
 			if (ex && ex2)
 				warn( "Both %s and %s exist; using the former.\n", path, path2 );
 			cfile.file = path;
+			cfile.path_len = path_len;
 		}
 	} else {
-		cfile.file = where;
+		const char *sl = strrchr( where, '/' );
+		if (!sl) {
+			nfsnprintf( path, sizeof(path), "./%n%s", &cfile.path_len, where );
+			cfile.file = path;
+		} else {
+			cfile.path_len = sl - where + 1;
+			cfile.file = where;
+		}
 	}
 
 	info( "Reading configuration file %s\n", cfile.file );

src/config.h

@@ -18,6 +18,7 @@ typedef struct {
 	int line;
 	int err;
 	int ms_warn;
+	int path_len;
 	char *cmd, *val, *rest;
 } conffile_t;
 
@@ -26,7 +27,7 @@ extern char FieldDelimiter;
 #define ARG_OPTIONAL 0
 #define ARG_REQUIRED 1
 
-char *expand_strdup( const char *s );
+char *expand_strdup( const char *s, const conffile_t *cfile );
 
 char *get_arg( conffile_t *cfile, int required, int *comment );
 

src/drv_imap.c

@@ -3590,7 +3590,7 @@ imap_parse_store( conffile_t *cfg, store_conf_t **storep )
 			} while ((arg = get_arg( cfg, ARG_OPTIONAL, NULL )));
 #ifdef HAVE_LIBSSL
 		} else if (!strcasecmp( "CertificateFile", cfg->cmd )) {
-			server->sconf.cert_file = expand_strdup( cfg->val );
+			server->sconf.cert_file = expand_strdup( cfg->val, cfg );
 			if (access( server->sconf.cert_file, R_OK )) {
 				sys_error( "%s:%d: CertificateFile '%s'",
 				           cfg->file, cfg->line, server->sconf.cert_file );
@@ -3599,14 +3599,14 @@ imap_parse_store( conffile_t *cfg, store_conf_t **storep )
 		} else if (!strcasecmp( "SystemCertificates", cfg->cmd )) {
 			server->sconf.system_certs = parse_bool( cfg );
 		} else if (!strcasecmp( "ClientCertificate", cfg->cmd )) {
-			server->sconf.client_certfile = expand_strdup( cfg->val );
+			server->sconf.client_certfile = expand_strdup( cfg->val, cfg );
 			if (access( server->sconf.client_certfile, R_OK )) {
 				sys_error( "%s:%d: ClientCertificate '%s'",
 				           cfg->file, cfg->line, server->sconf.client_certfile );
 				cfg->err = 1;
 			}
 		} else if (!strcasecmp( "ClientKey", cfg->cmd )) {
-			server->sconf.client_keyfile = expand_strdup( cfg->val );
+			server->sconf.client_keyfile = expand_strdup( cfg->val, cfg );
 			if (access( server->sconf.client_keyfile, R_OK )) {
 				sys_error( "%s:%d: ClientKey '%s'",
 				           cfg->file, cfg->line, server->sconf.client_keyfile );

src/drv_maildir.c

@@ -1857,9 +1857,9 @@ maildir_parse_store( conffile_t *cfg, store_conf_t **storep )
 
 	while (getcline( cfg ) && cfg->cmd) {
 		if (!strcasecmp( "Inbox", cfg->cmd )) {
-			store->inbox = expand_strdup( cfg->val );
+			store->inbox = expand_strdup( cfg->val, cfg );
 		} else if (!strcasecmp( "Path", cfg->cmd )) {
-			store->path = expand_strdup( cfg->val );
+			store->path = expand_strdup( cfg->val, cfg );
 #ifdef USE_DB
 		} else if (!strcasecmp( "AltMap", cfg->cmd )) {
 			store->alt_map = parse_bool( cfg );
@@ -1892,7 +1892,7 @@ maildir_parse_store( conffile_t *cfg, store_conf_t **storep )
 		}
 	}
 	if (!store->inbox)
-		store->inbox = expand_strdup( "~/Maildir" );
+		store->inbox = expand_strdup( "~/Maildir", NULL );
 	if (store->sub_style == SUB_MAILDIRPP && store->path) {
 		error( "Maildir store '%s': Setting Path is incompatible with 'SubFolders Maildir++'\n", store->name );
 		cfg->err = 1;

src/mbsync.1

@@ -105,6 +105,8 @@ and literal double quotes and backslashes (\fB\\\fR) must be backslash-escaped.
 All keywords (including those used as arguments) are case-insensitive.
 Bash-like home directory expansion using the tilde (\fB~\fR) is supported
 in all options which represent local paths.
+The reference point for relative local paths is the configuration file's
+containing directory.
 There are a few global options, the others apply to particular sections.
 Sections begin with a section-starting keyword and are terminated by an empty
 line or end of file.
@@ -205,7 +207,8 @@ yet all messages are archived.
 (Default: \fBno\fR)
 .
 .SS Maildir Stores
-The reference point for relative \fBPath\fRs is the current working directory.
+The reference point for relative \fBPath\fRs is the configuration file's
+containing directory.
 .P
 As \fBmbsync\fR needs UIDs, but no standardized UID storage scheme exists for
 Maildir, \fBmbsync\fR supports two schemes, each with its pros and cons.

src/run-tests.pl

@@ -289,12 +289,12 @@ sub writecfg($)
 "FSync no
 
 MaildirStore far
-Path ./
-Inbox ./far
+Path \"\"
+Inbox far
 ".$$sfx[0]."
 MaildirStore near
-Path ./
-Inbox ./near
+Path \"\"
+Inbox near
 ".$$sfx[1]."
 Channel test
 Far :far:

src/sync.h

@@ -35,7 +35,7 @@ typedef struct channel_conf {
 	const char *name;
 	store_conf_t *stores[2];
 	const char *boxes[2];
-	char *sync_state;
+	const char *sync_state;
 	string_list_t *patterns;
 	int ops[2];
 	int max_messages;  // For near side only.