version 1.1

- bind whole /etc and /var when installing, removing or reconfiguring packages

- update readme

README.md

@@ -1,6 +1,6 @@
 # voidnsrun
 
-`voidnsrun` is utility for launching programs in an isolated namespace with
+**voidnsrun** is utility for launching programs in an isolated namespace with
 alternative `/usr` tree. Its primary goal is to run glibc programs in
 musl-libc Void Linux environments or vice-versa.
 
@@ -33,7 +33,7 @@ Options:
 	-v:        print version
 ```
 
-`voidnsrun` needs to know the path to your alternative root directory and it can
+**voidnsrun** needs to know the path to your alternative root directory and it can
 read it from the `VOIDNSRUN_DIR` environment variable or you can use `-r`
 argument to specify it.
 
@@ -43,13 +43,19 @@ You may want to add something like this to your `~/.bashrc` or similar script:
 export VOIDNSRUN_DIR=/glibc
 ```
 
-By default, `voidnsrun` binds these paths from alternative root to the new
+By default, **voidnsrun** binds these paths from alternative root to the new
 namespace:
 - `/usr`
 - `/var/db/xbps`
 - `/etc/xbps.d`
 
-If you want to mount something else, use `-m` argument.
+But if you're launching `xbps-install`, `xbps-remove` or `xbps-reconfigure`
+and using **voidnsrun** version 1.1 or newer, this is what it will bind:
+- `/usr`
+- `/var`
+- `/etc`  
+
+If you want to bind something else, use the `-m` argument.
 
 ## Example
 
@@ -64,7 +70,7 @@ separate new directory:
 # XBPS_ARCH=x86_64 xbps-install --repository=http://alpha.de.repo.voidlinux.org/current -r /glibc -S base-voidstrap
 ```
 
-Export path to this installation for `voidnsrun`:
+Export path to this installation for **voidnsrun**:
 ```
 export VOIDNSRUN_DIR=/glibc
 ```
@@ -93,9 +99,9 @@ glib-devel-2.66.2_1	/usr/share/gdb/auto-load/usr/lib/libgobject-2.0.so.0.6600.2-
 libglib-devel-2.66.2_1	/usr/lib/libgobject-2.0.so -> /usr/lib/libgobject-2.0.so.0
 ```
 
-Sync repos and install `glib`. You can use `voidnsrun` for this purpose too.
+Sync repos and install `glib`. You can use **voidnsrun** for this purpose too.
 Also, I think you should bind `/etc` and `/var` while using `xbps-install` via
-`voidnsrun`, to not mess with your main system files.
+**voidnsrun**, to not mess with your main system files.
 ```
 $ sudo voidnsrun -r /glibc -m /etc -m /var xbps-install -Su
 $ sudo voidnsrun -r /glibc -m /etc -m /var xbps-install glib
@@ -113,6 +119,17 @@ end, it will work. (If it's not, then something's still missing. In particular,
 make sure to install fonts related packages: `xorg-fonts`, `freetype`,
 `fontconfig`, `libXft`.)
 
+## Changelog
+
+##### 1.1
+
+- Bind whole `/etc` and `/var` when launching `xbps-install`, `xbps-remove` or 
+  `xbps-reconfigure`.
+
+##### 1.0
+
+Initial release.
+
 ## License
 
 BSD-2c

voidnsrun.c

@@ -76,6 +76,24 @@ bool mountlist(
 	return true;
 }
 
+bool isxbpscommand(const char *s)
+{
+    const char *commands[] = {
+        "/xbps-install",
+        "/xbps-remove",
+        "/xbps-reconfigure"
+    };
+    for (size_t i = 0; i < ARRAY_SIZE(commands); i++) {
+        const char *command = commands[i];
+        if (!strcmp(s, command+1))
+            return true;
+        char *slash = strrchr(s, '/');
+        if (slash && !strcmp(slash, command))
+            return true;
+    }
+    return false;
+}
+
 int main(int argc, char **argv)
 {
 	if (argc < 2) {
@@ -87,7 +105,7 @@ int main(int argc, char **argv)
 	char *dir = NULL;
 	size_t dirlen;
 	const char *usermounts[USERMOUNTS_MAX] = {0};
-	int usermounts_count = 0;
+	int usermounts_num = 0;
 	int c;
 	while ((c = getopt(argc, argv, "vhm:r:")) != -1) {
 		switch (c) {
@@ -101,8 +119,8 @@ int main(int argc, char **argv)
 				dir = optarg;
 				break;
 			case 'm':
-				if (usermounts_count < USERMOUNTS_MAX) {
-					usermounts[usermounts_count++] = optarg;
+				if (usermounts_num < USERMOUNTS_MAX) {
+					usermounts[usermounts_num++] = optarg;
 					break;
 				} else {
 					ERROR("error: only up to %d user mounts allowed.\n",
@@ -138,11 +156,18 @@ int main(int argc, char **argv)
 	}
 
 	/* Mount stuff from altroot to our private namespace. */
-	const char *mountpoints[] = {"/usr", "/var/db/xbps", "/etc/xbps.d"};
+	const char *mountpoints[3] = {"/usr", NULL, NULL};
+	if (isxbpscommand(argv[optind])) {
+	    mountpoints[1] = "/var";
+        mountpoints[2] = "/etc";
+	} else {
+	    mountpoints[1] = "/var/db/xbps";
+	    mountpoints[2] = "/etc/xbps.d";
+	}
 	if (!mountlist(dir, dirlen, mountpoints, ARRAY_SIZE(mountpoints), true))
 		return 1;
-	if (usermounts_count > 0 && 
-		!mountlist(dir, dirlen, usermounts, usermounts_count, false))
+	if (usermounts_num > 0 &&
+        !mountlist(dir, dirlen, usermounts, usermounts_num, false))
 		return 1;
 
 	/* Drop root. */