[RFC PATCH 0/5] Add support for dracut

[RFC PATCH 0/5] Add support for dracut

['Quirin Gylstorff' via isar-users]

From: Quirin Gylstorff <quirin.gylstorff@siemens.com>

Debian intends to change the default initrd generator from
initramfs-tools to dracut[1],[2].

This is a first draft to support multiple initrd generator in
ISAR. I tested it with bookworm and trixie.

Currently missing is the possiblity to generate custom dracut initrd.
This will be added in a future revision of this patchset.

[1]: https://salsa.debian.org/kernel-team/meetings/-/wikis/20250730
[2]: https://meetbot.debian.net/debian-kernel/2025/debian-kernel.2025-08-06-19.00.log.html

Quirin Gylstorff (5):
  enable-fsck: remove dependency to initramfs-tools
  add dracut to custom kernel builds
  rootfs: Allow to overwrite the initramfs generation cmds
  rootfs Add dracut to initramfs generator
  initramfs: allow to set the generator command

 meta/classes/initramfs.bbclass                |  3 ++-
 meta/classes/rootfs.bbclass                   | 22 ++++++++++++++++---
 meta/recipes-kernel/linux/linux-custom.inc    |  2 +-
 .../enable-fsck/enable-fsck_0.2.bb            |  2 +-
 4 files changed, 23 insertions(+), 6 deletions(-)

-- 
2.50.1

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[RFC PATCH 1/5] enable-fsck: remove dependency to initramfs-tools

['Quirin Gylstorff' via isar-users]

From: Quirin Gylstorff <quirin.gylstorff@siemens.com>

The packages doesn't use any artifacts provided by initramfs-tools.

Signed-off-by: Quirin Gylstorff <quirin.gylstorff@siemens.com>
---
 meta/recipes-support/enable-fsck/enable-fsck_0.2.bb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/meta/recipes-support/enable-fsck/enable-fsck_0.2.bb b/meta/recipes-support/enable-fsck/enable-fsck_0.2.bb
index 2d0ec950..8a11990f 100644
--- a/meta/recipes-support/enable-fsck/enable-fsck_0.2.bb
+++ b/meta/recipes-support/enable-fsck/enable-fsck_0.2.bb
@@ -9,7 +9,7 @@ inherit dpkg-raw
 
 DESCRIPTION = "This service enables fsck on first boot"
 
-DEBIAN_DEPENDS = "systemd, sed, mount, initramfs-tools"
+DEBIAN_DEPENDS = "systemd, sed, mount"
 
 SRC_URI = " \
     file://enable-fsck.service \
-- 
2.50.1

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Re: [RFC PATCH 1/5] enable-fsck: remove dependency to initramfs-tools

['Jan Kiszka' via isar-users]

On 05.09.25 13:27, Quirin Gylstorff wrote:
> From: Quirin Gylstorff <quirin.gylstorff@siemens.com>
> 
> The packages doesn't use any artifacts provided by initramfs-tools.
> 
> Signed-off-by: Quirin Gylstorff <quirin.gylstorff@siemens.com>
> ---
>  meta/recipes-support/enable-fsck/enable-fsck_0.2.bb | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/meta/recipes-support/enable-fsck/enable-fsck_0.2.bb b/meta/recipes-support/enable-fsck/enable-fsck_0.2.bb
> index 2d0ec950..8a11990f 100644
> --- a/meta/recipes-support/enable-fsck/enable-fsck_0.2.bb
> +++ b/meta/recipes-support/enable-fsck/enable-fsck_0.2.bb

Recipe revision bump?

> @@ -9,7 +9,7 @@ inherit dpkg-raw
>  
>  DESCRIPTION = "This service enables fsck on first boot"
>  
> -DEBIAN_DEPENDS = "systemd, sed, mount, initramfs-tools"
> +DEBIAN_DEPENDS = "systemd, sed, mount"

I have no idea anymore why I once added that dependency... Makes no
sense, indeed.

>  
>  SRC_URI = " \
>      file://enable-fsck.service \

Jan

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Re: [RFC PATCH 1/5] enable-fsck: remove dependency to initramfs-tools

['Jan Kiszka' via isar-users]

On 05.09.25 14:25, 'Jan Kiszka' via isar-users wrote:
> On 05.09.25 13:27, Quirin Gylstorff wrote:
>> From: Quirin Gylstorff <quirin.gylstorff@siemens.com>
>>
>> The packages doesn't use any artifacts provided by initramfs-tools.
>>
>> Signed-off-by: Quirin Gylstorff <quirin.gylstorff@siemens.com>
>> ---
>>  meta/recipes-support/enable-fsck/enable-fsck_0.2.bb | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/meta/recipes-support/enable-fsck/enable-fsck_0.2.bb b/meta/recipes-support/enable-fsck/enable-fsck_0.2.bb
>> index 2d0ec950..8a11990f 100644
>> --- a/meta/recipes-support/enable-fsck/enable-fsck_0.2.bb
>> +++ b/meta/recipes-support/enable-fsck/enable-fsck_0.2.bb
> 
> Recipe revision bump?
> 
>> @@ -9,7 +9,7 @@ inherit dpkg-raw
>>  
>>  DESCRIPTION = "This service enables fsck on first boot"
>>  
>> -DEBIAN_DEPENDS = "systemd, sed, mount, initramfs-tools"
>> +DEBIAN_DEPENDS = "systemd, sed, mount"
> 
> I have no idea anymore why I once added that dependency... Makes no
> sense, indeed.
> 

Now I have: 2377b73d8f060bb03bed970853fc47a7197b7789 broke enable-fsck.
The current form does indeed no longer need the tools - but also has no
meaning anymore.

Jan

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[RFC PATCH 2/5] add dracut to custom kernel builds

['Quirin Gylstorff' via isar-users]

From: Quirin Gylstorff <quirin.gylstorff@siemens.com>

Signed-off-by: Quirin Gylstorff <quirin.gylstorff@siemens.com>
---
 meta/recipes-kernel/linux/linux-custom.inc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/meta/recipes-kernel/linux/linux-custom.inc b/meta/recipes-kernel/linux/linux-custom.inc
index 01e9bff7..3415db35 100644
--- a/meta/recipes-kernel/linux/linux-custom.inc
+++ b/meta/recipes-kernel/linux/linux-custom.inc
@@ -31,7 +31,7 @@ KBUILD_DEPENDS ?= "build-essential:native, \
                    linux-image-${KERNEL_NAME_PROVIDED}:${DISTRO_ARCH} <kbuild !kernel>, \
                    rsync,"
 
-KERNEL_DEBIAN_DEPENDS ?= "initramfs-tools | linux-initramfs-tool, \
+KERNEL_DEBIAN_DEPENDS ?= "initramfs-tools | linux-initramfs-tool | dracut, \
                           kmod, \
                           linux-base (>= 4.3~),"
 
-- 
2.50.1

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[RFC PATCH 3/5] rootfs: Allow to overwrite the initramfs generation cmds

['Quirin Gylstorff' via isar-users]

From: Quirin Gylstorff <quirin.gylstorff@siemens.com>

This is in preparation to support additional initramfs generators
like dracut.

Signed-off-by: Quirin Gylstorff <quirin.gylstorff@siemens.com>
---
 meta/classes/rootfs.bbclass | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/meta/classes/rootfs.bbclass b/meta/classes/rootfs.bbclass
index 7b7859b9..d3fb44c9 100644
--- a/meta/classes/rootfs.bbclass
+++ b/meta/classes/rootfs.bbclass
@@ -5,7 +5,16 @@ inherit deb-dl-dir
 
 ROOTFS_ARCH ?= "${DISTRO_ARCH}"
 ROOTFS_DISTRO ?= "${DISTRO}"
+
+def initramfs_generator_cmd(d):
+    return 'update-initramfs'
+
+def initramfs_generator_cmdline(d):
+    return "update-initramfs -u -v -k \"$kernel_version\""
+
 ROOTFS_PACKAGES ?= ""
+ROOTFS_INITRAMFS_GENERATOR_CMD ?= "${@ initramfs_generator_cmd(d)}"
+ROOTFS_INITRAMFS_GENERATOR_CMDLINE ?= "${@ initramfs_generator_cmdline(d)}"
 ROOTFS_BASE_DISTRO ?= "${BASE_DISTRO}"
 
 # Features of the rootfs creation:
@@ -183,7 +192,7 @@ rootfs_disable_initrd_generation[weight] = "1"
 rootfs_disable_initrd_generation() {
     # fully disable initrd generation
     sudo mkdir -p "${ROOTFSDIR}${ROOTFS_STUBS_DIR}"
-    sudo cp -a ${ROOTFSDIR}/usr/bin/true ${ROOTFSDIR}${ROOTFS_STUBS_DIR}/update-initramfs
+    sudo cp -a ${ROOTFSDIR}/usr/bin/true ${ROOTFSDIR}${ROOTFS_STUBS_DIR}/${ROOTFS_INITRAMFS_GENERATOR_CMD}
 }
 
 ROOTFS_INSTALL_COMMAND += "rootfs_install_pkgs_update"
@@ -485,11 +494,12 @@ rootfs_generate_initramfs() {
             export kernel_version=$(basename /boot/vmlinu[xz]-* | cut -d'-' -f2-); \
             echo "Total number of modules: $mods_total"; \
             echo "Generating initrd for kernel version: $kernel_version"; \
-            update-initramfs -u -v -k "$kernel_version";'
+            ${ROOTFS_INITRAMFS_GENERATOR_CMDLINE};'
         if [ -n "${INITRD_DEPLOY_FILE}" ]; then
             if [ -f "${ROOTFSDIR}/initrd.img" ]; then
                 # debian (mkinitramfs)
-                cp ${ROOTFSDIR}/initrd.img ${DEPLOYDIR}/${INITRD_DEPLOY_FILE}
+                sudo cp ${ROOTFSDIR}/initrd.img ${DEPLOYDIR}/${INITRD_DEPLOY_FILE}
+                sudo chown $(id -u):$(id -g) ${DEPLOYDIR}/${INITRD_DEPLOY_FILE}
             else
                 # ubuntu (dracut)
                 cp ${ROOTFSDIR}/boot/initrd.img ${DEPLOYDIR}/${INITRD_DEPLOY_FILE}
-- 
2.50.1

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Re: [RFC PATCH 3/5] rootfs: Allow to overwrite the initramfs generation cmds

['Jan Kiszka' via isar-users]

On 05.09.25 13:27, Quirin Gylstorff wrote:
> From: Quirin Gylstorff <quirin.gylstorff@siemens.com>
> 
> This is in preparation to support additional initramfs generators
> like dracut.
> 
> Signed-off-by: Quirin Gylstorff <quirin.gylstorff@siemens.com>
> ---
>  meta/classes/rootfs.bbclass | 16 +++++++++++++---
>  1 file changed, 13 insertions(+), 3 deletions(-)
> 
> diff --git a/meta/classes/rootfs.bbclass b/meta/classes/rootfs.bbclass
> index 7b7859b9..d3fb44c9 100644
> --- a/meta/classes/rootfs.bbclass
> +++ b/meta/classes/rootfs.bbclass
> @@ -5,7 +5,16 @@ inherit deb-dl-dir
>  
>  ROOTFS_ARCH ?= "${DISTRO_ARCH}"
>  ROOTFS_DISTRO ?= "${DISTRO}"
> +
> +def initramfs_generator_cmd(d):
> +    return 'update-initramfs'
> +
> +def initramfs_generator_cmdline(d):
> +    return "update-initramfs -u -v -k \"$kernel_version\""

Why functions, why not strings?

> +
>  ROOTFS_PACKAGES ?= ""
> +ROOTFS_INITRAMFS_GENERATOR_CMD ?= "${@ initramfs_generator_cmd(d)}"

How about deriving the initramfs_generator_cmd string from
initramfs_generator_cmdline? It should be the first word of the latter.

> +ROOTFS_INITRAMFS_GENERATOR_CMDLINE ?= "${@ initramfs_generator_cmdline(d)}"
>  ROOTFS_BASE_DISTRO ?= "${BASE_DISTRO}"
>  
>  # Features of the rootfs creation:
> @@ -183,7 +192,7 @@ rootfs_disable_initrd_generation[weight] = "1"
>  rootfs_disable_initrd_generation() {
>      # fully disable initrd generation
>      sudo mkdir -p "${ROOTFSDIR}${ROOTFS_STUBS_DIR}"
> -    sudo cp -a ${ROOTFSDIR}/usr/bin/true ${ROOTFSDIR}${ROOTFS_STUBS_DIR}/update-initramfs
> +    sudo cp -a ${ROOTFSDIR}/usr/bin/true ${ROOTFSDIR}${ROOTFS_STUBS_DIR}/${ROOTFS_INITRAMFS_GENERATOR_CMD}
>  }
>  
>  ROOTFS_INSTALL_COMMAND += "rootfs_install_pkgs_update"
> @@ -485,11 +494,12 @@ rootfs_generate_initramfs() {
>              export kernel_version=$(basename /boot/vmlinu[xz]-* | cut -d'-' -f2-); \
>              echo "Total number of modules: $mods_total"; \
>              echo "Generating initrd for kernel version: $kernel_version"; \
> -            update-initramfs -u -v -k "$kernel_version";'
> +            ${ROOTFS_INITRAMFS_GENERATOR_CMDLINE};'
>          if [ -n "${INITRD_DEPLOY_FILE}" ]; then
>              if [ -f "${ROOTFSDIR}/initrd.img" ]; then
>                  # debian (mkinitramfs)
> -                cp ${ROOTFSDIR}/initrd.img ${DEPLOYDIR}/${INITRD_DEPLOY_FILE}
> +                sudo cp ${ROOTFSDIR}/initrd.img ${DEPLOYDIR}/${INITRD_DEPLOY_FILE}
> +                sudo chown $(id -u):$(id -g) ${DEPLOYDIR}/${INITRD_DEPLOY_FILE}

This huck is also new - reason?

>              else
>                  # ubuntu (dracut)
>                  cp ${ROOTFSDIR}/boot/initrd.img ${DEPLOYDIR}/${INITRD_DEPLOY_FILE}

Jan

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[RFC PATCH 4/5] rootfs Add dracut to initramfs generator

['Quirin Gylstorff' via isar-users]

From: Quirin Gylstorff <quirin.gylstorff@siemens.com>

Signed-off-by: Quirin Gylstorff <quirin.gylstorff@siemens.com>
---
 meta/classes/rootfs.bbclass | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meta/classes/rootfs.bbclass b/meta/classes/rootfs.bbclass
index d3fb44c9..9e02dbd1 100644
--- a/meta/classes/rootfs.bbclass
+++ b/meta/classes/rootfs.bbclass
@@ -7,9 +7,15 @@ ROOTFS_ARCH ?= "${DISTRO_ARCH}"
 ROOTFS_DISTRO ?= "${DISTRO}"
 
 def initramfs_generator_cmd(d):
+    rootfs_packages =  d.getVar('ROOTFS_PACKAGES') or ''
+    if 'dracut' in rootfs_packages:
+        return 'rootfs'
     return 'update-initramfs'
 
 def initramfs_generator_cmdline(d):
+    initramfs_generator_cmd =  d.getVar('ROOTFS_INITRAMFS_GENERATOR_CMD')
+    if 'dracut' in initramfs_generator_cmd:
+        return "dracut --force /initrd.img \"$kernel_version\""
     return "update-initramfs -u -v -k \"$kernel_version\""
 
 ROOTFS_PACKAGES ?= ""
-- 
2.50.1

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Re: [RFC PATCH 4/5] rootfs Add dracut to initramfs generator

['Jan Kiszka' via isar-users]

On 05.09.25 13:27, Quirin Gylstorff wrote:
> From: Quirin Gylstorff <quirin.gylstorff@siemens.com>
> 
> Signed-off-by: Quirin Gylstorff <quirin.gylstorff@siemens.com>
> ---
>  meta/classes/rootfs.bbclass | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/meta/classes/rootfs.bbclass b/meta/classes/rootfs.bbclass
> index d3fb44c9..9e02dbd1 100644
> --- a/meta/classes/rootfs.bbclass
> +++ b/meta/classes/rootfs.bbclass
> @@ -7,9 +7,15 @@ ROOTFS_ARCH ?= "${DISTRO_ARCH}"
>  ROOTFS_DISTRO ?= "${DISTRO}"
>  
>  def initramfs_generator_cmd(d):
> +    rootfs_packages =  d.getVar('ROOTFS_PACKAGES') or ''
> +    if 'dracut' in rootfs_packages:
> +        return 'rootfs'
>      return 'update-initramfs'
>  
>  def initramfs_generator_cmdline(d):
> +    initramfs_generator_cmd =  d.getVar('ROOTFS_INITRAMFS_GENERATOR_CMD')
> +    if 'dracut' in initramfs_generator_cmd:
> +        return "dracut --force /initrd.img \"$kernel_version\""
>      return "update-initramfs -u -v -k \"$kernel_version\""
>  
>  ROOTFS_PACKAGES ?= ""

OK, now I see why you defined functions. But initramfs_generator_cmd can
still be simplified by taking the first word of initramfs_generator_cmdline.

Jan

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Re: [RFC PATCH 4/5] rootfs Add dracut to initramfs generator

['Quirin Gylstorff' via isar-users]

On 9/5/25 14:30, Jan Kiszka wrote:
> On 05.09.25 13:27, Quirin Gylstorff wrote:
>> From: Quirin Gylstorff <quirin.gylstorff@siemens.com>
>>
>> Signed-off-by: Quirin Gylstorff <quirin.gylstorff@siemens.com>
>> ---
>>   meta/classes/rootfs.bbclass | 6 ++++++
>>   1 file changed, 6 insertions(+)
>>
>> diff --git a/meta/classes/rootfs.bbclass b/meta/classes/rootfs.bbclass
>> index d3fb44c9..9e02dbd1 100644
>> --- a/meta/classes/rootfs.bbclass
>> +++ b/meta/classes/rootfs.bbclass
>> @@ -7,9 +7,15 @@ ROOTFS_ARCH ?= "${DISTRO_ARCH}"
>>   ROOTFS_DISTRO ?= "${DISTRO}"
>>   
>>   def initramfs_generator_cmd(d):
>> +    rootfs_packages =  d.getVar('ROOTFS_PACKAGES') or ''
>> +    if 'dracut' in rootfs_packages:
>> +        return 'rootfs'
>>       return 'update-initramfs'
>>   
>>   def initramfs_generator_cmdline(d):
>> +    initramfs_generator_cmd =  d.getVar('ROOTFS_INITRAMFS_GENERATOR_CMD')
>> +    if 'dracut' in initramfs_generator_cmd:
>> +        return "dracut --force /initrd.img \"$kernel_version\""
>>       return "update-initramfs -u -v -k \"$kernel_version\""
>>   
>>   ROOTFS_PACKAGES ?= ""
> 
> OK, now I see why you defined functions. But initramfs_generator_cmd can
> still be simplified by taking the first word of initramfs_generator_cmdline.
ok i will change it in a v2.

Quirin
> 
> Jan
> 

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Re: [RFC PATCH 4/5] rootfs Add dracut to initramfs generator

['Quirin Gylstorff' via isar-users]

On 9/5/25 13:27, 'Quirin Gylstorff' via isar-users wrote:
> From: Quirin Gylstorff <quirin.gylstorff@siemens.com>
> 
> Signed-off-by: Quirin Gylstorff <quirin.gylstorff@siemens.com>
> ---
>   meta/classes/rootfs.bbclass | 6 ++++++
>   1 file changed, 6 insertions(+)
> 
> diff --git a/meta/classes/rootfs.bbclass b/meta/classes/rootfs.bbclass
> index d3fb44c9..9e02dbd1 100644
> --- a/meta/classes/rootfs.bbclass
> +++ b/meta/classes/rootfs.bbclass
> @@ -7,9 +7,15 @@ ROOTFS_ARCH ?= "${DISTRO_ARCH}"
>   ROOTFS_DISTRO ?= "${DISTRO}"
>   
>   def initramfs_generator_cmd(d):
> +    rootfs_packages =  d.getVar('ROOTFS_PACKAGES') or ''
> +    if 'dracut' in rootfs_packages:
> +        return 'rootfs'
This should be `dracut`. I will fix it in v2.

Quirin
>       return 'update-initramfs'
>   
>   def initramfs_generator_cmdline(d):
> +    initramfs_generator_cmd =  d.getVar('ROOTFS_INITRAMFS_GENERATOR_CMD')
> +    if 'dracut' in initramfs_generator_cmd:
> +        return "dracut --force /initrd.img \"$kernel_version\""
>       return "update-initramfs -u -v -k \"$kernel_version\""
>   
>   ROOTFS_PACKAGES ?= ""

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[RFC PATCH 5/5] initramfs: allow to set the generator command

['Quirin Gylstorff' via isar-users]

From: Quirin Gylstorff <quirin.gylstorff@siemens.com>

This allows to exchange the initramfs generator.

Signed-off-by: Quirin Gylstorff <quirin.gylstorff@siemens.com>
---
 meta/classes/initramfs.bbclass | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/meta/classes/initramfs.bbclass b/meta/classes/initramfs.bbclass
index 658ef0ac..f9c919de 100644
--- a/meta/classes/initramfs.bbclass
+++ b/meta/classes/initramfs.bbclass
@@ -10,6 +10,7 @@ INITRAMFS_INSTALL ?= ""
 INITRAMFS_PREINSTALL ?= ""
 INITRAMFS_ROOTFS ?= "${WORKDIR}/rootfs"
 INITRAMFS_IMAGE_NAME = "${INITRAMFS_FULLNAME}.initrd.img"
+INITRAMFS_GENERATOR_PKG ??= "initramfs-tools"
 INITRD_DEPLOY_FILE = "${INITRAMFS_IMAGE_NAME}"
 
 # Install proper kernel
@@ -26,6 +27,6 @@ DEPENDS += "${INITRAMFS_INSTALL}"
 
 ROOTFSDIR = "${INITRAMFS_ROOTFS}"
 ROOTFS_FEATURES = "generate-manifest"
-ROOTFS_PACKAGES = "initramfs-tools ${INITRAMFS_PREINSTALL} ${INITRAMFS_INSTALL}"
+ROOTFS_PACKAGES = "${INITRAMFS_GENERATOR_PKG} ${INITRAMFS_PREINSTALL} ${INITRAMFS_INSTALL}"
 
 inherit rootfs
-- 
2.50.1

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Re: [RFC PATCH 5/5] initramfs: allow to set the generator command

['Jan Kiszka' via isar-users]

On 05.09.25 13:27, Quirin Gylstorff wrote:
> From: Quirin Gylstorff <quirin.gylstorff@siemens.com>
> 
> This allows to exchange the initramfs generator.
> 
> Signed-off-by: Quirin Gylstorff <quirin.gylstorff@siemens.com>
> ---
>  meta/classes/initramfs.bbclass | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/meta/classes/initramfs.bbclass b/meta/classes/initramfs.bbclass
> index 658ef0ac..f9c919de 100644
> --- a/meta/classes/initramfs.bbclass
> +++ b/meta/classes/initramfs.bbclass
> @@ -10,6 +10,7 @@ INITRAMFS_INSTALL ?= ""
>  INITRAMFS_PREINSTALL ?= ""
>  INITRAMFS_ROOTFS ?= "${WORKDIR}/rootfs"
>  INITRAMFS_IMAGE_NAME = "${INITRAMFS_FULLNAME}.initrd.img"
> +INITRAMFS_GENERATOR_PKG ??= "initramfs-tools"
>  INITRD_DEPLOY_FILE = "${INITRAMFS_IMAGE_NAME}"
>  
>  # Install proper kernel
> @@ -26,6 +27,6 @@ DEPENDS += "${INITRAMFS_INSTALL}"
>  
>  ROOTFSDIR = "${INITRAMFS_ROOTFS}"
>  ROOTFS_FEATURES = "generate-manifest"
> -ROOTFS_PACKAGES = "initramfs-tools ${INITRAMFS_PREINSTALL} ${INITRAMFS_INSTALL}"
> +ROOTFS_PACKAGES = "${INITRAMFS_GENERATOR_PKG} ${INITRAMFS_PREINSTALL} ${INITRAMFS_INSTALL}"
>  
>  inherit rootfs

Do we need extra safety belts for the case that users create custom
initramfs hooks and set the wrong INITRAMFS_GENERATOR_PKG?

Jan

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Linux Expert Center

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Re: [RFC PATCH 5/5] initramfs: allow to set the generator command

['Quirin Gylstorff' via isar-users]

On 9/5/25 14:32, Jan Kiszka wrote:
> On 05.09.25 13:27, Quirin Gylstorff wrote:
>> From: Quirin Gylstorff <quirin.gylstorff@siemens.com>
>>
>> This allows to exchange the initramfs generator.
>>
>> Signed-off-by: Quirin Gylstorff <quirin.gylstorff@siemens.com>
>> ---
>>   meta/classes/initramfs.bbclass | 3 ++-
>>   1 file changed, 2 insertions(+), 1 deletion(-)
>>
>> diff --git a/meta/classes/initramfs.bbclass b/meta/classes/initramfs.bbclass
>> index 658ef0ac..f9c919de 100644
>> --- a/meta/classes/initramfs.bbclass
>> +++ b/meta/classes/initramfs.bbclass
>> @@ -10,6 +10,7 @@ INITRAMFS_INSTALL ?= ""
>>   INITRAMFS_PREINSTALL ?= ""
>>   INITRAMFS_ROOTFS ?= "${WORKDIR}/rootfs"
>>   INITRAMFS_IMAGE_NAME = "${INITRAMFS_FULLNAME}.initrd.img"
>> +INITRAMFS_GENERATOR_PKG ??= "initramfs-tools"
>>   INITRD_DEPLOY_FILE = "${INITRAMFS_IMAGE_NAME}"
>>   
>>   # Install proper kernel
>> @@ -26,6 +27,6 @@ DEPENDS += "${INITRAMFS_INSTALL}"
>>   
>>   ROOTFSDIR = "${INITRAMFS_ROOTFS}"
>>   ROOTFS_FEATURES = "generate-manifest"
>> -ROOTFS_PACKAGES = "initramfs-tools ${INITRAMFS_PREINSTALL} ${INITRAMFS_INSTALL}"
>> +ROOTFS_PACKAGES = "${INITRAMFS_GENERATOR_PKG} ${INITRAMFS_PREINSTALL} ${INITRAMFS_INSTALL}"
>>   
>>   inherit rootfs
> 
> Do we need extra safety belts for the case that users create custom
> initramfs hooks and set the wrong INITRAMFS_GENERATOR_PKG?

I am not sure if this will survive the next iteration. Reusing the 
initramfs class for dracut initrd leads to major pains if using in 
layers where the INITRAMFS_(PRE)INSTALL is set by *.conf.

My current plan is to split it up and create a base class.

Quirn
> 
> Jan
> 

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Re: [RFC PATCH 5/5] initramfs: allow to set the generator command

['Jan Kiszka' via isar-users]

On 05.09.25 14:41, Quirin Gylstorff wrote:
> 
> 
> On 9/5/25 14:32, Jan Kiszka wrote:
>> On 05.09.25 13:27, Quirin Gylstorff wrote:
>>> From: Quirin Gylstorff <quirin.gylstorff@siemens.com>
>>>
>>> This allows to exchange the initramfs generator.
>>>
>>> Signed-off-by: Quirin Gylstorff <quirin.gylstorff@siemens.com>
>>> ---
>>>   meta/classes/initramfs.bbclass | 3 ++-
>>>   1 file changed, 2 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/meta/classes/initramfs.bbclass b/meta/classes/
>>> initramfs.bbclass
>>> index 658ef0ac..f9c919de 100644
>>> --- a/meta/classes/initramfs.bbclass
>>> +++ b/meta/classes/initramfs.bbclass
>>> @@ -10,6 +10,7 @@ INITRAMFS_INSTALL ?= ""
>>>   INITRAMFS_PREINSTALL ?= ""
>>>   INITRAMFS_ROOTFS ?= "${WORKDIR}/rootfs"
>>>   INITRAMFS_IMAGE_NAME = "${INITRAMFS_FULLNAME}.initrd.img"
>>> +INITRAMFS_GENERATOR_PKG ??= "initramfs-tools"
>>>   INITRD_DEPLOY_FILE = "${INITRAMFS_IMAGE_NAME}"
>>>     # Install proper kernel
>>> @@ -26,6 +27,6 @@ DEPENDS += "${INITRAMFS_INSTALL}"
>>>     ROOTFSDIR = "${INITRAMFS_ROOTFS}"
>>>   ROOTFS_FEATURES = "generate-manifest"
>>> -ROOTFS_PACKAGES = "initramfs-tools ${INITRAMFS_PREINSTALL}
>>> ${INITRAMFS_INSTALL}"
>>> +ROOTFS_PACKAGES = "${INITRAMFS_GENERATOR_PKG}
>>> ${INITRAMFS_PREINSTALL} ${INITRAMFS_INSTALL}"
>>>     inherit rootfs
>>
>> Do we need extra safety belts for the case that users create custom
>> initramfs hooks and set the wrong INITRAMFS_GENERATOR_PKG?
> 
> I am not sure if this will survive the next iteration. Reusing the
> initramfs class for dracut initrd leads to major pains if using in
> layers where the INITRAMFS_(PRE)INSTALL is set by *.conf.

No, it's really about flagging / preventing unsupported combos. We will
continue to support initramfs-hooks for a longer while, backward
compatibility. But now user should not try to generate custom initramfs
with those hooks while having switched to a different generator.

> 
> My current plan is to split it up and create a base class.

We will probably need completely different helpers to create custom
dracut modules, no?

Jan

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Linux Expert Center

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Re: [RFC PATCH 5/5] initramfs: allow to set the generator command

['Quirin Gylstorff' via isar-users]

On 9/5/25 14:52, Jan Kiszka wrote:
> On 05.09.25 14:41, Quirin Gylstorff wrote:
>>
>>
>> On 9/5/25 14:32, Jan Kiszka wrote:
>>> On 05.09.25 13:27, Quirin Gylstorff wrote:
>>>> From: Quirin Gylstorff <quirin.gylstorff@siemens.com>
>>>>
>>>> This allows to exchange the initramfs generator.
>>>>
>>>> Signed-off-by: Quirin Gylstorff <quirin.gylstorff@siemens.com>
>>>> ---
>>>>    meta/classes/initramfs.bbclass | 3 ++-
>>>>    1 file changed, 2 insertions(+), 1 deletion(-)
>>>>
>>>> diff --git a/meta/classes/initramfs.bbclass b/meta/classes/
>>>> initramfs.bbclass
>>>> index 658ef0ac..f9c919de 100644
>>>> --- a/meta/classes/initramfs.bbclass
>>>> +++ b/meta/classes/initramfs.bbclass
>>>> @@ -10,6 +10,7 @@ INITRAMFS_INSTALL ?= ""
>>>>    INITRAMFS_PREINSTALL ?= ""
>>>>    INITRAMFS_ROOTFS ?= "${WORKDIR}/rootfs"
>>>>    INITRAMFS_IMAGE_NAME = "${INITRAMFS_FULLNAME}.initrd.img"
>>>> +INITRAMFS_GENERATOR_PKG ??= "initramfs-tools"
>>>>    INITRD_DEPLOY_FILE = "${INITRAMFS_IMAGE_NAME}"
>>>>      # Install proper kernel
>>>> @@ -26,6 +27,6 @@ DEPENDS += "${INITRAMFS_INSTALL}"
>>>>      ROOTFSDIR = "${INITRAMFS_ROOTFS}"
>>>>    ROOTFS_FEATURES = "generate-manifest"
>>>> -ROOTFS_PACKAGES = "initramfs-tools ${INITRAMFS_PREINSTALL}
>>>> ${INITRAMFS_INSTALL}"
>>>> +ROOTFS_PACKAGES = "${INITRAMFS_GENERATOR_PKG}
>>>> ${INITRAMFS_PREINSTALL} ${INITRAMFS_INSTALL}"
>>>>      inherit rootfs
>>>
>>> Do we need extra safety belts for the case that users create custom
>>> initramfs hooks and set the wrong INITRAMFS_GENERATOR_PKG?
>>
>> I am not sure if this will survive the next iteration. Reusing the
>> initramfs class for dracut initrd leads to major pains if using in
>> layers where the INITRAMFS_(PRE)INSTALL is set by *.conf.
> 
> No, it's really about flagging / preventing unsupported combos. We will
> continue to support initramfs-hooks for a longer while, backward
> compatibility. But now user should not try to generate custom initramfs
> with those hooks while having switched to a different generator.

Currently it breaks on the package installation level if the dependency 
are correct. As initramfs-tools are incompatible with dracut. We need to
check the dependencies of the package before installing it to avoid 
this. For now i can check if there are recipes with a specific name in 
ROOTFS_PACKAGE but there is always the possibility to that it will break 
on installation.

> 
>>
>> My current plan is to split it up and create a base class.
> 
> We will probably need completely different helpers to create custom
> dracut modules, no?

Yes we need a new set of helpers. I will look into it after the basic 
infrastructure is in place.


 > > Jan
> 
Quirin

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