Test 20 - "NFSv3 root=dhcp DHCP IP:path" fails on debian

[LaszloGombos]

https://github.com/dracutdevs/dracut/blob/master/test/TEST-20-NFS/test.sh#L152 times out in when running on a Debian container. 4 NFS subtests pass, but the 5th times out.

The same test passes on the Fedora-latest and Arch containers, so the concern seems to be distro dependent.

[LaszloGombos]

Possibly a symptom of #2259 .

[LaszloGombos]

CC @bdrung for his possible feedback

[bdrung]

The rpc user is named _rpc on Debian. Debian carries a patch: https://sources.debian.org/src/dracut/059-4/debian/patches/rpc-user/

[bdrung]

Found this in the server.log:

jobs -rp
/sbin/init: 105: jobs: Illegal option -r

Reason: This works with bash but not with dash:

$ bash -c "jobs -rp"
$ dash -c "jobs -rp"
dash: 1: jobs: Illegal option -r

[LaszloGombos]

$ bash -c "jobs -rp"
$ dash -c "jobs -rp"
dash: 1: jobs: Illegal option -r

This can be resolved with the following patch, but I do not think this is enough to make the test pass on Debian

--- a/test/TEST-20-NFS/test.sh
+++ b/test/TEST-20-NFS/test.sh
@@ -415,7 +415,7 @@ test_setup() {
     )
     # Make server's dracut image
     "$basedir"/dracut.sh -l -i "$TESTDIR"/overlay / \
-        -m "dash rootfs-block debug kernel-modules watchdog qemu network network-legacy" \
+        -m "bash rootfs-block debug kernel-modules watchdog qemu network network-legacy" \
         -d "af_packet piix ide-gd_mod ata_piix ext4 sd_mod e1000 i6300esb" \
         --no-hostonly-cmdline -N \
         -f "$TESTDIR"/initramfs.server "$KVERSION" || return 1