update-kernel: Allow to define system flavour for testing purposes

For Docker CI test.

Signed-off-by: Vitaly Chikunov <vt@altlinux.org>

Dockerfile

@@ -3,6 +3,8 @@ FROM alt:sisyphus
 # Trace execution.
 SHELL ["/bin/bash", "-xec"]
 
+ENV UPDATE_KERNEL_SYS_FLAVOUR=std-def
+
 ARG branch=sisyphus
 ARG repo=http://ftp.altlinux.org/pub/distributions/archive/$branch/date
 ARG a=2022/01/01
@@ -24,7 +26,7 @@ COPY update-kernel remove-old-kernels /usr/sbin/
 # Install base kernel for upgrading later.
 # Check if the kernel appeared.
 RUN toilet -w 150 First install && \
-    update-kernel -v -t std-def -f --headers && \
+    update-kernel -v -f --headers && \
     ls -l /boot/vmlinuz /boot/vmlinuz-std-def /boot/initrd.img /boot/initrd-std-def.img && \
     ls -l /boot/$(readlink /boot/vmlinuz)
 
@@ -40,7 +42,7 @@ RUN \
 
 # Update kernel.
 RUN toilet Upgrading && \
-    update-kernel -v -t std-def -f && \
+    update-kernel -v -f && \
     update-kernel -v -l && \
     ls -la /boot
 

update-kernel

@@ -303,9 +303,13 @@ elif [[ "$release" =~ ^(kernel-image-)?.*[-=#][0-9:]+\.[0-9.]+-[^-]+$ ]]; then
 fi
 
 # set kernel flavour. if not defined with -t option, use current
-current_kernel_flavour=$uname_r
-current_kernel_flavour="${current_kernel_flavour#*-}"
-current_kernel_flavour="${current_kernel_flavour%-*}"
+if [ -n "$UPDATE_KERNEL_SYS_FLAVOUR" ]; then
+	current_kernel_flavour=$UPDATE_KERNEL_SYS_FLAVOUR
+else
+	current_kernel_flavour=$uname_r
+	current_kernel_flavour="${current_kernel_flavour#*-}"
+	current_kernel_flavour="${current_kernel_flavour%-*}"
+fi
 kernel_flavour="${kernel_flavour:-$current_kernel_flavour}"
 
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