264 lines
10 KiB
Bash
264 lines
10 KiB
Bash
#!/bin/sh
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# This contains the COMPLETE list of binaries that this script needs
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# to function. The only exception is the QEMU binary since it is not
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# known in advance which one wil be required.
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readonly LIBTOOLS="cp echo cat printf which mountpoint mount umount modprobe"
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info_msg() {
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# This function handles the printing that is bold within all
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# scripts. This is a convenience function so that the rather ugly
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# looking ASCII escape codes live in only one place.
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printf "\033[1m%s\n\033[m" "$@"
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}
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die() {
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# This function is registered in all the scripts to make sure that
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# the important mounts get cleaned up and the $ROOTFS location is
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# removed.
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printf "FATAL: %s\n" "$@"
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umount_pseudofs
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[ -d "$ROOTFS" ] && rm -rf "$ROOTFS"
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exit 1
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}
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check_tools() {
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# All scripts within mklive declare the tools they will use in a
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# variable called "REQTOOLS". This function checks that these
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# tools are available and prints out the path to each tool that
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# will be used. This can be useful to figure out what is broken
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# if a different version of something is used than was expected.
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for tool in $LIBTOOLS $REQTOOLS ; do
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if ! which "$tool" > /dev/null ; then
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die "Required tool $f is not available on this system!"
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fi
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done
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info_msg "The following tools will be used:"
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for tool in $LIBTOOLS $REQTOOLS ; do
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which "$tool"
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done
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}
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mount_pseudofs() {
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# This function ensures that the psuedofs mountpoints are present
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# in the chroot. Strictly they are not necessary to have for many
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# commands, but bind-mounts are cheap and it isn't too bad to just
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# mount them all the time.
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for f in dev proc sys; do
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# In a naked chroot there is nothing to bind the mounts to, so
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# we need to create directories for these first.
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[ ! -d "$ROOTFS/$f" ] && mkdir -p "$ROOTFS/$f"
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if ! mountpoint -q "$ROOTFS/$f" ; then
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# It is VERY important that this only happen if the
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# pseudofs isn't already mounted. If it already is then
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# this is virtually impossible to troubleshoot because it
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# looks like the subsequent umount just isn't working.
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mount -r --bind /$f "$ROOTFS/$f"
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fi
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done
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}
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umount_pseudofs() {
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# This function cleans up the mounts in the chroot. Failure to
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# clean up these mounts will prevent the tmpdir from being
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# deletable instead throwing the error "Device or Resource Busy".
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# The '-f' option is passed to umount to account for the
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# contingency where the psuedofs mounts are not present.
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if [ -d "${ROOTFS}" ]; then
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for f in dev proc sys; do
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umount -f "$ROOTFS/$f" >/dev/null 2>&1
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done
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fi
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}
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run_cmd_target() {
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info_msg "Running $* for target $XBPS_TARGET_ARCH ..."
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if [ "$XBPS_TARGET_ARCH" = "$(xbps-uhelper arch)" ] ; then
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# This is being run on the same architecture as the host,
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# therefore we should set XBPS_ARCH.
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if ! eval XBPS_ARCH="$XBPS_TARGET_ARCH" "$@" ; then
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die "Could not run command $*"
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fi
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else
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# This is being run on a foriegn arch, therefore we should set
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# XBPS_TARGET_ARCH. In this case XBPS will not attempt
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# certain actions and will require reconfiguration later.
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if ! eval XBPS_TARGET_ARCH="$XBPS_TARGET_ARCH" "$@" ; then
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die "Could not run command $*"
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fi
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fi
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}
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run_cmd() {
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# This is a general purpose function to run commands that a user
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# may wish to see. For example its useful to see the tar/xz
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# pipeline to not need to delve into the scripts to see what
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# options its set up with.
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info_msg "Running $*"
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eval "$@"
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}
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run_cmd_chroot() {
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# General purpose chroot function which makes sure the chroot is
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# prepared. This function takes 2 arguments, the location to
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# chroot to and the command to run.
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# This is an idempotent function, it is safe to call every time
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# before entering the chroot. This has the advantage of making
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# execution in the chroot appear as though it "Just Works(tm)".
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register_binfmt
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# Before we step into the chroot we need to make sure the
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# pseudo-filesystems are ready to go. Not all commands will need
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# this, but its still a good idea to call it here anyway.
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mount_pseudofs
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# With assurance that things will run now we can jump into the
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# chroot and run stuff!
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chroot "$1" sh -c "$2"
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}
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cleanup_chroot() {
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# This function cleans up the chroot shims that are used by QEMU
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# to allow builds on alien platforms. It takes no arguments but
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# expects the global $ROOTFS variable to be set.
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# Un-Mount the pseudofs mounts if they were mounted
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umount_pseudofs
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# If a QEMU binary was copied in, remove that as well
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if [ -x "$ROOTFS/usr/bin/$QEMU_BIN" ] ; then
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rm "$ROOTFS/usr/bin/$QEMU_BIN"
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fi
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}
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# TODO: Figure out how to register the binfmt for x86_64 and for i686
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# to facilitate building on alien build systems.
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register_binfmt() {
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# This function sets up everything that is needed to be able to
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# chroot into a ROOTFS and be able to run commands there. This
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# really matters on platforms where the host architecture is
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# different from the target, and you wouldn't be able to run
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# things like xbps-reconfigure -a. This function is idempotent
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# (You can run it multiple times without modifying state). This
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# function takes no arguments, but does expect the global variable
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# $XBPS_TARGET_ARCH to be set.
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# This select sets up the "magic" bytes in /proc that let the
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# kernel select an alternate interpreter. More values for this
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# map can be obtained from here:
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# https://github.com/qemu/qemu/blob/master/scripts/qemu-binfmt-conf.sh
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# If the XBPS_TARGET_ARCH is unset but the PLATFORM is known, it
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# may be possible to set the architecture from the static
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# platforms map.
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if [ -z "$XBPS_TARGET_ARCH" ] && [ ! -z "$PLATFORM" ] ; then
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set_target_arch_from_platform
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fi
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case "${XBPS_TARGET_ARCH}" in
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armv*)
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_cpu=arm
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_magic="\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x28\x00"
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_mask="\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff"
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QEMU_BIN=qemu-arm-static
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;;
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aarch64*)
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_cpu=aarch64
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_magic="\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\xb7"
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_mask="\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff"
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QEMU_BIN=qemu-aarch64-static
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;;
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mipsel*)
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_cpu=mipsel
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_magic="\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08\x00"
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_mask="\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff"
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QEMU_BIN=qemu-mipsel-static
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;;
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*86*)
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info_msg "FIXME: Assuming that x86 instructions are native"
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QEMU_BIN=NATIVE
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;;
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*)
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die "Unknown target architecture!"
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;;
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esac
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# In the special case where the build is native we can return
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# without doing anything else
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if [ "$QEMU_BIN" = "NATIVE" ] ; then
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return
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fi
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# For builds that do not match the host architecture, the correct
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# qemu binary will be required.
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if ! $QEMU_BIN -version >/dev/null 2>&1; then
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die "$QEMU_BIN binary is missing in your system, exiting."
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fi
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# In order to use the binfmt system the binfmt_misc mountpoint
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# must exist inside of proc
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if ! mountpoint -q /proc/sys/fs/binfmt_misc ; then
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modprobe -q binfmt_misc
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mount -t binfmt_misc binfmt_misc /proc/sys/fs/binfmt_misc 2>/dev/null
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fi
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# Only register if the map is incomplete
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if [ ! -f /proc/sys/fs/binfmt_misc/qemu-$_cpu ] ; then
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echo ":qemu-$_cpu:M::$_magic:$_mask:/usr/bin/$QEMU_BIN:" > /proc/sys/fs/binfmt_misc/register 2>/dev/null
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fi
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# If the static binary isn't in the chroot then the chroot will
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# fail. The kernel knows about the map but without the static
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# version there's no interpreter in the chroot, only the
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# dynamically linked one in the host. To simplify things we just
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# use the static one always and make sure it shows up at the same
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# place in the host and the chroot.
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if [ ! -x "$ROOTFS/usr/bin/$QEMU_BIN" ] ; then
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cp -f "$(which "$QEMU_BIN")" "$ROOTFS/usr/bin" ||
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die "Could not install $QEMU_BIN to $ROOTFS/usr/bin/"
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fi
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}
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set_target_arch_from_platform() {
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# This function maintains a lookup from platform to target
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# architecture. This is required for scripts that need to know
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# the target architecture, but don't necessarily need to know it
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# internally (i.e. only run_cmd_chroot).
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case "$PLATFORM" in
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bananapi*) XBPS_TARGET_ARCH="armv7l";;
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beaglebone*) XBPS_TARGET_ARCH="armv7l";;
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cubieboard2*|cubietruck*) XBPS_TARGET_ARCH="armv7l";;
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dockstar*) XBPS_TARGET_ARCH="armv5tel";;
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odroid-u2*) XBPS_TARGET_ARCH="armv7l";;
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odroid-c2*) XBPS_TARGET_ARCH="aarch64";;
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rpi3*) XBPS_TARGET_ARCH="aarch64";;
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rpi2*) XBPS_TARGET_ARCH="armv7l";;
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rpi*) XBPS_TARGET_ARCH="armv6l";;
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usbarmory*) XBPS_TARGET_ARCH="armv7l";;
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ci20*) XBPS_TARGET_ARCH="mipsel";;
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i686*) XBPS_TARGET_ARCH="i686";;
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x86_64*) XBPS_TARGET_ARCH="x86_64";;
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GCP*) XBPS_TARGET_ARCH="x86_64";;
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*) die "$PROGNAME: Unable to compute target architecture from platform";;
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esac
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if [ -z "${PLATFORM##*-musl}" ] ; then
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XBPS_TARGET_ARCH="${XBPS_TARGET_ARCH}-musl"
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fi
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}
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set_cachedir() {
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# The package artifacts are cacheable, but they need to be isolated
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# from the host cache.
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: "${XBPS_CACHEDIR:=--cachedir=$PWD/xbps-cache/${XBPS_TARGET_ARCH}}"
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}
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# These should all resolve even if they won't have the appropriate
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# repodata files for the selected architecture.
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: "${XBPS_REPOSITORY:=--repository=http://repo.voidlinux.eu/current \
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--repository=http://repo.voidlinux.eu/current/musl \
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--repository=http://repo.voidlinux.eu/current/aarch64}"
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