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post-fs-data.sh: Combine seapp snippets from all modules to produce full file #99

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Nov 14, 2024
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post-fs-data.sh: Combine seapp snippets from all modules to produce full file #99

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19 changes: 19 additions & 0 deletions app/build.gradle.kts
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Original file line number Diff line number Diff line change
Expand Up @@ -368,6 +368,24 @@ android.applicationVariants.all {
}
}

val seappContexts = tasks.register("seappContexts${capitalized}") {
inputs.property("variant.applicationId", variant.applicationId)

val outputFile = variantDir.map { it.file("plat_seapp_contexts") }
outputs.file(outputFile)

doLast {
outputFile.get().asFile.writeText(listOf(
"user=_app",
"isPrivApp=true",
"name=${variant.applicationId}",
"domain=msd_app",
"type=app_data_file",
"levelFrom=all",
).joinToString(" "))
}
}

tasks.register<Zip>("zip${capitalized}") {
inputs.property("rootProject.name", rootProject.name)
inputs.property("variant.applicationId", variant.applicationId)
Expand All @@ -391,6 +409,7 @@ android.applicationVariants.all {
from(configXml.map { it.outputs }) {
into("system/etc/sysconfig")
}
from(seappContexts.map { it.outputs })
from(variant.outputs.map { it.outputFile }) {
into("system/priv-app/${variant.applicationId}")
}
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37 changes: 14 additions & 23 deletions app/module/post-fs-data.sh
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Expand Up @@ -22,31 +22,22 @@ header Creating custota_app domain

"${mod_dir}"/custota-selinux."$(getprop ro.product.cpu.abi)" -ST

header Updating seapp_contexts

seapp_file=/system/etc/selinux/plat_seapp_contexts
seapp_temp_dir=${mod_dir}/seapp_temp
seapp_temp_file=${mod_dir}/seapp_temp/plat_seapp_contexts

mkdir -p "${seapp_temp_dir}"

nsenter --mount=/proc/1/ns/mnt -- \
mount -t tmpfs "${app_id}" "${seapp_temp_dir}"
# Android's SELinux implementation cannot load seapp_contexts files from a
# directory, so the original file must be edited and multiple modules may want
# to do so. Due to Magisk/KernelSU's behavior of running scripts for all modules
# before mounting any files, each module that modifies this file needs to
# produce the same output, so snippets from all modules are included.
# Regardless of the module load order, all modules that include the following
# command will produce the same output file, so it does not matter which one is
# mounted last.

# Full path because Magisk runs this script in busybox's standalone ash mode and
# we need Android's toybox version of cp.
/system/bin/cp --preserve=a "${seapp_file}" "${seapp_temp_file}"

cat >> "${seapp_temp_file}" << EOF
user=_app isPrivApp=true name=${app_id} domain=custota_app type=app_data_file levelFrom=all
EOF

while has_mountpoint "${seapp_file}"; do
umount -l "${seapp_file}"
done
header Updating seapp_contexts

nsenter --mount=/proc/1/ns/mnt -- \
mount -o ro,bind "${seapp_temp_file}" "${seapp_file}"
mkdir -p "${mod_dir}/system/etc/selinux"
paste -s -d '\n' \
/system/etc/selinux/plat_seapp_contexts \
/data/adb/modules/*/plat_seapp_contexts \
> "${mod_dir}/system/etc/selinux/plat_seapp_contexts"

# On some devices, the system time is set too late in the boot process. This,
# for some reason, causes the package manager service to not update the package
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