kernel/linux.git/usr/gen_initramfs.sh, branch v6.19.11

gen_initramfs.sh: use gen_init_cpio -o parameter

2025-08-20T23:02:56+00:00

gen_init_cpio can now write to a file directly, so use it when gen_initramfs.sh is called with -o (e.g. usr/Makefile invocation). Signed-off-by: David Disseldorp Reviewed-by: Nicolas Schier Link: https://lore.kernel.org/r/20250819032607.28727-6-ddiss@suse.de Signed-off-by: Nathan Chancellor

initramfs: Encode dependency on KBUILD_BUILD_TIMESTAMP

2023-06-06T08:54:49+00:00

gen_initramfs.sh has an internal dependency on KBUILD_BUILD_TIMESTAMP for generating file mtimes that is not exposed to make, so changing KBUILD_BUILD_TIMESTAMP will not trigger a rebuild of the archive. Declare the mtime date as a new parameter to gen_initramfs.sh to encode KBUILD_BUILD_TIMESTAMP in the shell command, thereby making make aware of the dependency. It will rebuild if KBUILD_BUILD_TIMESTAMP changes or is newly set/unset. It will _not_ rebuild if KBUILD_BUILD_TIMESTAMP is unset before and after. This should be fine for anyone who doesn't care about setting specific build times in the first place. Reviewed-by: Andrew Donnellan Tested-by: Andrew Donnellan Signed-off-by: Benjamin Gray Reviewed-by: Nicolas Schier Signed-off-by: Masahiro Yamada

kbuild: replace LANG=C with LC_ALL=C

2021-05-01T15:43:35+00:00

LANG gives a weak default to each LC_* in case it is not explicitly defined. LC_ALL, if set, overrides all other LC_* variables. LANG < LC_CTYPE, LC_COLLATE, LC_MONETARY, LC_NUMERIC, ... < LC_ALL This is why documentation such as [1] suggests to set LC_ALL in build scripts to get the deterministic result. LANG=C is not strong enough to override LC_* that may be set by end users. [1]: https://reproducible-builds.org/docs/locales/ Signed-off-by: Masahiro Yamada Acked-by: Michael Ellerman (powerpc) Reviewed-by: Matthias Maennich Acked-by: Matthieu Baerts (mptcp) Reviewed-by: Greg Kroah-Hartman

gen_initramfs.sh: remove intermediate cpio_list on errors

2020-01-15T15:26:22+00:00

This script sets the -e option, so it exits on any error, in which case it exits without cleaning up the intermediate cpio_list. Make sure to delete it on exit. Signed-off-by: Masahiro Yamada

initramfs: refactor the initramfs build rules

2020-01-15T15:26:21+00:00

Currently, usr/gen_initramfs.sh takes care of all the use-cases: [1] generates a cpio file unless CONFIG_INITRAMFS_SOURCE points to a single cpio archive [2] If CONFIG_INITRAMFS_SOURCE is the path to a cpio archive, use it as-is. [3] Compress the cpio file according to CONFIG_INITRAMFS_COMPRESSION_* unless it is passed a compressed archive. To simplify the script, move [2] and [3] to usr/Makefile. If CONFIG_INITRAMFS_SOURCE is the path to a cpio archive, there is no need to run this shell script. For the cpio archive compression, you can re-use the rules from scripts/Makefile.lib . Signed-off-by: Masahiro Yamada

gen_initramfs.sh: always output cpio even without -o option

2020-01-15T15:25:22+00:00

Currently, this script outputs a cpio file when -o option is given, but otherwise a text file in the format recognized by gen_init_cpio. This behavior is unclear. Make it always output a cpio file. Signed-off-by: Masahiro Yamada

initramfs: add default_cpio_list, and delete -d option support

2020-01-15T15:25:22+00:00

When CONFIG_INITRAMFS_SOURCE is empty, the Makefile passes the -d option to gen_initramfs.sh to create the default initramfs, which contains /dev, /dev/console, and /root. This commit simplifies the default behavior; remove the -d option, and add the default cpio list. Signed-off-by: Masahiro Yamada

initramfs: generate dependency list and cpio at the same time

2020-01-15T15:25:21+00:00

Currently, this script is run twice, for the dependency list, and then for the cpio archive. The first one is re-run every time although its build log is suppressed so nobody notices it. Make it work more efficiently by generating the cpio and the dependency list at the same time. Signed-off-by: Masahiro Yamada

initramfs: specify $(src)/gen_initramfs.sh as a prerequisite in Makefile

2020-01-15T15:24:38+00:00

Specify the dependency directly in the Makefile. Signed-off-by: Masahiro Yamada Reviewed-by: Greg Thelen

initramfs: rename gen_initramfs_list.sh to gen_initramfs.sh

2020-01-14T01:42:44+00:00

The comments in usr/Makefile wrongly refer to the script name (twice). Line 37: # The dependency list is generated by gen_initramfs.sh -l Line 54: # 4) Arguments to gen_initramfs.sh changes There does not exist such a script. I was going to fix the comments, but after some consideration, I thought "gen_initramfs.sh" would be more suitable than "gen_initramfs_list.sh" because it generates an initramfs image in the common usage. The script generates a list that can be fed to gen_init_cpio only when it is directly run without -o or -l option. Signed-off-by: Masahiro Yamada