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Add --custom-config as per request in #14 #15

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77dcff8
Add --custom-config argument as per #14
deajan Jan 23, 2026
d611c84
Document custom configuration usage in README
deajan Jan 23, 2026
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13 changes: 13 additions & 0 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -90,6 +90,7 @@ If called without arguments, installs stable kernel using /opt/linux
--dir |-d install directory
--kexec |-x load new kernel without reboot
--config |-c set configuration target
--custom-config |-cc set custom configuration directive, can be used multiple times
--verbose |-v increase verbosity
--get-verified-tarball |-gvt cryptographically verify kernel tarball
--nproc |-n set the number of processing units to use
Expand Down Expand Up @@ -149,6 +150,18 @@ kvmconfig - Enable additional options for guest kernel support
tinyconfig - Configure the tiniest possible kernel
```

### Custom configuration directives

In order to enable specific kernel configs, one can use `--custom-config` like the following example:
```
./kernel_installer.sh --custom-config "scripts/config --set-val CONFIG_DM_VDO m"
```

Note that `--custom-config can be used multiple times like:
```
./kernel_installer.sh --custom-config "scripts/config --set-val CONFIG_DM_VDO m" --custom-config "scripts/config --set-val CONFIG_KERNEL_ZSTD y"
```

To use --get-verified-tarball:
```bash
./kernel_installer.sh --get-verified-tarball
Expand Down
20 changes: 19 additions & 1 deletion kernel_installer.sh
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Expand Up @@ -11,7 +11,7 @@
######################################################################


VERSION='1.2.5'
VERSION='1.2.6-dev'

#------------------------------------------------------------------------------#
#
Expand Down Expand Up @@ -351,6 +351,7 @@ usage() {
printf "%s\\n" " ${YELLOW}--dir |-d${NORMAL} install directory"
printf "%s\\n" " ${YELLOW}--kexec |-x${NORMAL} load new kernel without reboot"
printf "%s\\n" " ${YELLOW}--config |-c${NORMAL} set configuration target"
printf "%s\\n" " ${YELLOW}--custom-config |-cc${NORMAL} set custom configuration directive, can be used multiple times"
printf "%s\\n" " ${YELLOW}--verbose |-v${NORMAL} increase verbosity"
printf "%s\\n" " ${YELLOW}--get-verified-tarball |-gvt${NORMAL} cryptographically verify kernel tarball"
printf "%s\\n" " ${YELLOW}--nproc |-n${NORMAL} set the number of processing units to use"
Expand All @@ -367,6 +368,7 @@ usage() {
}

POSITIONAL_ARGS=()
CUSTOM_CONFIG_OPTIONS=()

while [[ $# -gt 0 ]]; do
case $1 in
Expand Down Expand Up @@ -413,6 +415,11 @@ while [[ $# -gt 0 ]]; do
shift
shift
;;
--custom-config | -cc)
CUSTOM_CONFIG_OPTIONS+=("$2")
shift
shift
;;
--kexec | -x)
shift
KEXEC=1
Expand Down Expand Up @@ -467,6 +474,13 @@ set -- "${POSITIONAL_ARGS[@]}" # restore positional parameters

chk_kernel

if [ -n "$CUSTOM_CONFIG_OPTIONS" ]; then
SANITIZED_CUSTOM_CONFIG_OPTIONS=()
for custom_config_option in "${CUSTOM_CONFIG_OPTIONS[@]}"; do
SANITIZED_CUSTOM_CONFIG_OPTIONS+=("$(echo "$custom_config_option")")
done
fi

# Start with a clean log
if [[ -f $LOGFILE ]]; then
rm "$LOGFILE"
Expand Down Expand Up @@ -1000,6 +1014,10 @@ install_kernel() {
scripts/config --enable CONFIG_ZRAM_BACKEND_842
scripts/config --enable CONFIG_ZRAM_BACKEND_LZO
fi
for custom_config_option in "${SANITIZED_CUSTOM_CONFIG_OPTIONS[@]}"; do
log_debug "Adding custom config option: \"$custom_config_option\""
eval "$custom_config_option"
done
echo
# Compilation
log_debug "Phase 5 of 6: Compilation"
Expand Down