make.conf(5) says: PORTAGE_BINPKG_TAR_OPTS This variable contains options to be passed to the tar command for creation of binary packages. However, it seems to have no effect: # BINPKG_FORMAT=gpkg PORTAGE_BINPKG_TAR_OPTS=--mtime=2023-01-01T00:00:00Z emerge -B app-editors/mg [...] >>> Emerging (1 of 1) app-editors/mg-20230501::gentoo [...] >>> Done # tar tvf /var/cache/binpkgs/app-editors/mg/mg-20230501-1.gpkg.tar -rw-r--r-- 0/0 0 2023-06-24 08:36 mg-20230501-1/gpkg-1 -rw-r--r-- 0/0 16682 2023-06-24 08:36 mg-20230501-1/metadata.tar.bz2 -rw-r--r-- 0/0 393873 2023-06-24 08:36 mg-20230501-1/image.tar.bz2 -rw-r--r-- 0/0 887 2023-06-24 08:36 mg-20230501-1/Manifest # tar xf /var/cache/binpkgs/app-editors/mg/mg-20230501-1.gpkg.tar # tar tvf mg-20230501-1/image.tar.bz2 drwxr-xr-x root/root 0 2023-06-24 10:36 image/ drwxr-xr-x root/root 0 2023-06-24 10:36 image/usr/ drwxr-xr-x root/root 0 2023-06-24 10:36 image/usr/bin/ -rwxr-xr-x root/root 223856 2023-06-24 10:36 image/usr/bin/mg [...] Whereas with xpak things work as expected: # BINPKG_FORMAT=xpak PORTAGE_BINPKG_TAR_OPTS=--mtime=2023-01-01T00:00:00Z emerge -B app-editors/mg [...] >>> Emerging (1 of 1) app-editors/mg-20230501::gentoo [...] >>> Done # tar tvf /var/cache/binpkgs/app-editors/mg/mg-20230501-2.xpak drwxr-xr-x root/root 0 2023-01-01 01:00 ./ drwxr-xr-x root/root 0 2023-01-01 01:00 ./usr/ [...] drwxr-xr-x root/root 0 2023-01-01 00:00 ./usr/bin/ -rwxr-xr-x root/root 223856 2023-01-01 00:00 ./usr/bin/mg bzip2: (stdin): trailing garbage after EOF ignored
