xbps: workaround script calls when the sh alternative is not available.

srcpkgs/xbps/patches/fix-missing-sh.patch

@@ -0,0 +1,30 @@
+diff --git lib/package_script.c lib/package_script.c
+index a8c05dcf..919f821b 100644
+--- lib/package_script.c
++++ lib/package_script.c
+@@ -40,9 +40,10 @@ xbps_pkg_exec_buffer(struct xbps_handle *xhp,
+                     bool update)
+ {
+        ssize_t ret;
+-       const char *tmpdir, *version;
++       const char *tmpdir, *version, *shell;
+        char *pkgname, *fpath;
+        int fd, rv;
++       struct stat st;
+ 
+        assert(blob);
+        assert(pkgver);
+@@ -100,7 +101,12 @@ xbps_pkg_exec_buffer(struct xbps_handle *xhp,
+        version = xbps_pkg_version(pkgver);
+        assert(version);
+ 
+-       rv = xbps_file_exec(xhp, "/bin/sh", fpath, action, pkgname, version,
++       // Fallback
++       shell = "/bin/sh";
++       if (stat(shell, &st) < 0) {
++               shell = "/bin/dash";
++       }
++       rv = xbps_file_exec(xhp, shell, fpath, action, pkgname, version,
+                            update ? "yes" : "no",
+                            "no", xhp->native_arch, NULL);
+        free(pkgname);

srcpkgs/xbps/patches/series

@@ -3,3 +3,4 @@ d72091a20.patch
 7b728f5ac.patch
 44692f28d8.patch
 bb96486b127.patch
+fix-missing-sh.patch

srcpkgs/xbps/template

@@ -1,7 +1,7 @@
 # Template file for 'xbps'
 pkgname=xbps
 version=0.56
-revision=5
+revision=6
 bootstrap=yes
 build_style=configure
 short_desc="XBPS package system utilities"