CI: Add optional patch level, fix hostname on F42

In the past there have been times when we need to generate new RPMs
for an existing ZFS release.  Typically this happens when a new RHEL
version comes out and the kernel symbols no longer match.  To get
users to auto-update we just bump the patch number.  For example, we
had to create zfs-2.1.13-1 for EL8.8 and zfs-2.1.13-2 for EL8.9.

This commit adds an optional patch level text box to the github
package builder runner.

In addition, this commit also uses `hostnamectl` instead of `hostname`
for F42+ compatibility, if available.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Tony Hutter <hutter2@llnl.gov>
Closes openzfs#17638

Author: tonyhutter

.github/workflows/scripts/qemu-4-build-vm.sh

@@ -5,12 +5,13 @@
 #
 # Usage:
 #
-#       qemu-4-build-vm.sh OS [--enable-debug][--dkms][--poweroff]
-#           [--release][--repo][--tarball]
+#       qemu-4-build-vm.sh OS [--enable-debug][--dkms][--patch-level NUM]
+#               [--poweroff][--release][--repo][--tarball]
 #
 # OS:           OS name like 'fedora41'
 # --enable-debug:  Build RPMs with '--enable-debug' (for testing)
 # --dkms:       Build DKMS RPMs as well
+# --patch-level NUM:    Use a custom patch level number for packages.
 # --poweroff:   Power-off the VM after building
 # --release     Build zfs-release*.rpm as well
 # --repo        After building everything, copy RPMs into /tmp/repo
@@ -21,6 +22,7 @@
 
 ENABLE_DEBUG=""
 DKMS=""
+PATCH_LEVEL=""
 POWEROFF=""
 RELEASE=""
 REPO=""
@@ -35,6 +37,11 @@ while [[ $# -gt 0 ]]; do
       DKMS=1
       shift
       ;;
+    --patch-level)
+      PATCH_LEVEL=$2
+      shift
+      shift
+      ;;
     --poweroff)
       POWEROFF=1
       shift
@@ -215,6 +222,10 @@ function rpm_build_and_install() {
   run ./autogen.sh
   echo "##[endgroup]"
 
+  if [ -n "$PATCH_LEVEL" ] ; then
+    sed -i -E 's/(Release:\s+)1/\1'$PATCH_LEVEL'/g' META
+  fi
+
   echo "##[group]Configure"
   run ./configure --enable-debuginfo $extra
   echo "##[endgroup]"
@@ -328,7 +339,13 @@ fi
 # almalinux9.5
 # fedora42
 source /etc/os-release
-sudo hostname "$ID$VERSION_ID"
+ if which hostnamectl &> /dev/null ; then
+  # Fedora 42+ use hostnamectl
+  sudo hostnamectl set-hostname "$ID$VERSION_ID"
+  sudo hostnamectl set-hostname --pretty "$ID$VERSION_ID"
+else
+  sudo hostname "$ID$VERSION_ID"
+fi
 
 # save some sysinfo
 uname -a > /var/tmp/uname.txt

.github/workflows/zfs-qemu-packages.yml

@@ -32,6 +32,11 @@ on:
         options:
         - "Build RPMs"
         - "Test repo"
+      patch_level:
+        type: string
+        required: false
+        default: ""
+        description: "(optional) patch level number"
       repo_url:
         type: string
         required: false
@@ -78,7 +83,13 @@ jobs:
                 mkdir -p /tmp/repo
                 ssh zfs@vm0 '$HOME/zfs/.github/workflows/scripts/qemu-test-repo-vm.sh' ${{ github.event.inputs.repo_url }}
         else
-                .github/workflows/scripts/qemu-4-build.sh --repo --release --dkms --tarball ${{ matrix.os }}
+                EXTRA=""
+                if [ -n "${{ github.event.inputs.patch_level }}" ] ; then
+                        EXTRA="--patch-level ${{ github.event.inputs.patch_level }}"
+                fi
+
+                .github/workflows/scripts/qemu-4-build.sh $EXTRA \
+                        --repo --release --dkms --tarball ${{ matrix.os }}
         fi
 
     - name: Prepare artifacts