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here is the log from the commit of package nodejs-common for openSUSE:Factory 
checked in at 2021-06-16 20:33:15
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Comparing /work/SRC/openSUSE:Factory/nodejs-common (Old)
 and      /work/SRC/openSUSE:Factory/.nodejs-common.new.32437 (New)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

Package is "nodejs-common"

Wed Jun 16 20:33:15 2021 rev:13 rq:899493 version:5.0

Changes:
--------
--- /work/SRC/openSUSE:Factory/nodejs-common/nodejs-common.changes      
2021-05-10 15:39:02.929645572 +0200
+++ /work/SRC/openSUSE:Factory/.nodejs-common.new.32437/nodejs-common.changes   
2021-06-16 20:33:16.262959443 +0200
@@ -1,0 +2,10 @@
+Thu Jun 10 10:27:58 UTC 2021 - Adam Majer <adam.ma...@suse.de>
+
+- Use libalternatives on TW by default
+
+-------------------------------------------------------------------
+Mon May 31 16:32:18 UTC 2021 - Adam Majer <adam.ma...@suse.de>
+
+- Add libalternatives support
+
+-------------------------------------------------------------------

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

Other differences:
------------------
++++++ nodejs-common.spec ++++++
--- /var/tmp/diff_new_pack.TAsql0/_old  2021-06-16 20:33:16.842960433 +0200
+++ /var/tmp/diff_new_pack.TAsql0/_new  2021-06-16 20:33:16.842960433 +0200
@@ -28,6 +28,12 @@
 %define NODEJS_LTS      16
 %define NODEJS_CURRENT  16
 
+%if 0%{?suse_version} > 1500
+%bcond_without libalternatives
+%else
+%bcond_with libalternatives
+%endif
+
 # SLE-12 variants
 %if 0%{?suse_version} < 1500
 %define default_node_ver %NODEJS_LTS
@@ -64,7 +70,7 @@
 %endif
 
 Name:           nodejs-common
-Version:        4.1
+Version:        5.0
 Release:        0
 Summary:        Common files for the NodeJS ecosystem
 License:        MIT
@@ -78,6 +84,11 @@
 Conflicts:      nodejs7 < 7.10.1
 Conflicts:      nodejs8 < 8.1.4
 BuildRequires:  gcc
+%if %{with libalternatives}
+BuildRequires:  libalternatives-devel
+%define libalternatives_cflags -DHAVE_LIBALTERNATIVES_H
+%define libalternatives_lflags -lalternatives
+%endif
 
 %description
 Common NodeJS files that allow recursive invocation of Node executable
@@ -120,7 +131,7 @@
 %prep
 %build
 cp %{S:2} .
-gcc ${RPM_OPT_FLAGS} -o node %{S:1}
+gcc ${RPM_OPT_FLAGS} %?libalternatives_cflags -o node %{S:1} 
%?libalternatives_lflags
 
 echo "Default Node version: " %{default_node_ver}
 

++++++ node.c ++++++
--- /var/tmp/diff_new_pack.TAsql0/_old  2021-06-16 20:33:16.914960556 +0200
+++ /var/tmp/diff_new_pack.TAsql0/_new  2021-06-16 20:33:16.914960556 +0200
@@ -5,6 +5,10 @@
 #include <string.h>
 #include <unistd.h>
 
+#ifdef HAVE_LIBALTERNATIVES_H
+#include <libalternatives.h>
+#endif
+
 const unsigned min_version = 4;
 const unsigned max_version = 42;
 const char *default_version = "-default";
@@ -62,6 +66,17 @@
                printInvalidVersion(version);
        }
 
+#ifdef HAVE_LIBALTERNATIVES_H
+       // if we want default version and not using update-alternatives
+       if (version == default_version)
+       {
+               // should not return, and if it does, it probably means
+               // we should fall back to using node-default fallback.
+               libalts_exec_default(argv);
+               fputs("Falling back to using -default symlink.\n", stderr);
+       }
+#endif
+
        /* Generate our program path and check that we can execute it */
        char *program_path, *program;
        if (asprintf(&program, "%s%s", *bn, version) == -1 ||

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