Initial commit

.gitignore

@@ -0,0 +1,6 @@
+/binpkgs/
+/gentoo/
+/portlog/
+/sysroot/
+/sysroot.tar
+/sysroot.tar.xz

BUGS.txt

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+When cross-compiling:
+- Various shebangs don't point to the proper EPREFIX
+
+On termux itself:
+- dev-libs/libxml2 cannot be built (hardlinks in source tarball)
+- sys-devel/libtool cannot be built (no error given...?)
+- portage errors spectaularly if sys-apps/portage is anywhere in the dependency tree
+- bash keeps spamming error messages: "shell-init: error retrieving current directory: getcwd: cannot access parent directories: Permission denied"
+- after merging dev-lang/perl, no executable permission on /usr/bin/perl

build-termux.sh

@@ -0,0 +1,150 @@
+#!/bin/sh
+set -e
+
+# Main settings
+PROFILE=default/linux/arm64/17.0/prefix/kernel-3.2+
+ldso=/lib/ld-linux-aarch64.so.1
+virtual_os_headers=sys-kernel/linux-headers
+virtual_libc=sys-libs/glibc
+
+# Output paths
+export PORTDIR="$PWD/gentoo"
+export ROOT="$PWD/sysroot"
+export EPREFIX=/data/data/com.termux/files/gentoo
+PKGDIR="$PWD/binpkgs"
+PORTAGE_LOGDIR="$PWD/portlog"
+
+# Cleanup (optional)
+#rm -rf "$ROOT"
+
+# Configure portage profile and gather variables
+EROOT="$ROOT$EPREFIX"
+export SYSROOT="$ROOT"
+export PORTAGE_CONFIGROOT="$EROOT"
+rm -rf "$PORTAGE_CONFIGROOT/etc/portage"
+mkdir -p "$PORTAGE_CONFIGROOT/etc/portage"
+ln -srfT "$PORTDIR/profiles/$PROFILE" "$PORTAGE_CONFIGROOT/etc/portage/make.profile"
+BROOT="$(portageq envvar BROOT)"
+CHOST="$(portageq envvar CHOST)"
+ARCH="$(portageq envvar ARCH)"
+LIBDIR="$(portageq envvar LIBDIR_$ARCH)"
+
+# Portage settings
+export EMERGE_LOG_DIR="${EMERGE_LOG_DIR:-$EROOT/var/log}"
+export PORTAGE_LOGDIR="${PORTAGE_LOGDIR:-$EROOT/var/log/portage}"
+export PORTAGE_TMPDIR="${PORTAGE_TMPDIR:-$EROOT/var/tmp}"
+export PKGDIR="${PKGDIR:-$EROOT/var/cache/distfiles}"
+export PORTAGE_REPO_DUPLICATE_WARN=0
+cat > "$PORTAGE_CONFIGROOT/etc/portage/make.conf" << EOF
+ACCEPT_KEYWORDS="\$ARCH -~\$ARCH"
+EOF
+
+# Install patches
+cp -a "$PWD/patches" "$PORTAGE_CONFIGROOT/etc/portage/patches"
+
+# Configure the toolchain
+rm -rf "$ROOT/tmp-bin"
+mkdir -p "$ROOT/tmp-bin"
+cat > "$ROOT/tmp-bin/$CHOST-gcc" << EOF
+#!/bin/sh
+exec '$(command -v $CHOST-gcc)' --sysroot='$EROOT' -specs='$ROOT/tmp-bin/$CHOST.specs' "\$@"
+EOF
+cat > "$ROOT/tmp-bin/$CHOST-g++" << EOF
+#!/bin/sh
+exec '$(command -v $CHOST-g++)' --sysroot='$EROOT' -specs='$ROOT/tmp-bin/$CHOST.specs' "\$@"
+EOF
+cat > "$ROOT/tmp-bin/$CHOST.specs" << EOF
+%rename link old_link
+*link:
+%(old_link) %{!static:%{!static-pie:%{!shared:--dynamic-linker=$EPREFIX$ldso}}}
+EOF
+chmod +x "$ROOT/tmp-bin/$CHOST-gcc" "$ROOT/tmp-bin/$CHOST-g++"
+
+#export PREROOTPATH="$ROOT/tmp-bin"  # doesn't work anymore
+cat > "$BROOT/etc/env.d/000tmp" << EOF
+PATH='$ROOT/tmp-bin'
+EOF
+( unset EPREFIX ROOT SYSROOT; env-update )
+
+export PKG_CONFIG_PATH="$EROOT/usr/$LIBDIR/pkgconfig"
+
+# Sanity check
+gcc_host="$(portageq best_visible "$EROOT" sys-devel/gcc | cut -d/ -f2)"
+gcc_build="$(unset EPREFIX ROOT SYSROOT; portageq best_version "$BROOT" "cross-$CHOST/gcc" | cut -d/ -f2)"
+if [ "$gcc_host" != "$gcc_build" ]; then
+    echo "Host and build gcc mismatch!"
+    echo "Please update your build's gcc to match"
+    echo "host: sys-devel/$gcc_host"
+    echo "build: cross-$CHOST/$gcc_build"
+    exit 1
+fi
+
+# Autoconf defines...
+export ac_cv_func_malloc_0_nonnull=yes  # required by sys-process/procps (old autoconf)
+export ac_cv_func_realloc_0_nonnull=yes  # required by sys-process/procps (old autoconf)
+export ac_cv_file__dev_ptmx=yes  # required by dev-lang/python
+export ac_cv_file__dev_ptc=no  # required by dev-lang/python
+
+export CHOST  # required by cross-emerge
+
+if [ -n "$*" ]; then
+    cross-emerge -vnbk -1 "$@"
+else
+    cross-emerge -vnbk -O1 sys-apps/baselayout
+    cross-emerge -vnbk -o --onlydeps-with-rdeps=n $virtual_os_headers
+    cross-emerge -vnbk -O1 $virtual_os_headers virtual/os-headers
+    cross-emerge -vnbk -o --onlydeps-with-rdeps=n $virtual_libc
+    cross-emerge -vnbk -O1 $virtual_libc virtual/libc
+    cross-emerge -vnbk -DN @system
+    cross-emerge -c --with-bdeps=n
+fi
+
+# NOTE: Modified portage/package/ebuild/doebuild.py to hardcode eprefix and get
+#       ccache to work...
+#unset CCACHE_DISABLE
+#export CCACHE_DIR="$PWD/ccache"
+#export FEATURES="ccache"
+#cross-emerge -vnbk -O $virtual_os_headers
+#FEATURES="ccache nostrip" CFLAGS="-O2 -ggdb" cross-emerge -v -O $virtual_libc
+
+# Cleanup
+rm -rf "$EROOT/var/log" "$EROOT/var/tmp" "$EROOT/var/cache"
+rm -rf "$ROOT/tmp-bin"
+rm -f "$BROOT/etc/env.d/000tmp"
+( unset EPREFIX ROOT SYSROOT; env-update )
+
+# Finalize the portage config
+ln -sfT "../../var/db/repos/gentoo/profiles/$PROFILE" "$PORTAGE_CONFIGROOT/etc/portage/make.profile"
+
+# Install additional files
+mkdir -p "$EROOT/etc"
+cat > "$EROOT/etc/resolv.conf" << EOF
+# Termux defaults ¯\\_(ツ)_/¯
+nameserver 8.8.8.8
+nameserver 8.8.4.4
+EOF
+
+# Package up
+rm -f sysroot.tar sysroot.tar sysroot.tar.xz
+tar cf sysroot.tar -C "$ROOT" --hard-dereference .
+xz -9v sysroot.tar
+
+# Termux setup:
+# - pkg up / termux-change-repo
+# - pkg in openssh
+# - passwd
+# - sshd
+# - ifconfig
+# Copying the files:
+# - scp -P 8022 sysroot.tar.xz <ip>:~
+# - ssh -p 8022 <ip>
+# - cd /; tar xf ~/sysroot.tar.xz
+# Running the environment:
+# - LD_PRELOAD= /data/data/com.termux/files/gentoo/bin/bash -l
+# First-time initialization:
+# - /data/data/com.termux/files/gentoo/sbin/ldconfig
+# - /data/data/com.termux/files/gentoo/usr/sbin/env-update
+# - echo "termux:x:$(id -u):$(id -g):termux:/data/data/com.termux/files/home:/data/data/com.termux/gentoo/bin/bash" >> /data/data/com.termux/files/gentoo/etc/passwd
+# - echo "termux::$(id -g):" >> /data/data/com.termux/files/gentoo/etc/group
+# - exec /data/data/com.termux/files/gentoo/bin/bash -l
+# - emerge-webrsync

gentoo.diff

@@ -0,0 +1,66 @@
+diff --git a/app-admin/eselect/eselect-1.4.20.ebuild b/app-admin/eselect/eselect-1.4.20.ebuild
+index 338c3aba0..63490c9b4 100644
+--- a/app-admin/eselect/eselect-1.4.20.ebuild
++++ b/app-admin/eselect/eselect-1.4.20.ebuild
+@@ -26,6 +26,13 @@ BDEPEND="doc? ( dev-python/docutils )"
+ PDEPEND="emacs? ( app-emacs/eselect-mode )
+ 	vim-syntax? ( app-vim/eselect-syntax )"
+ 
++# https://bugs.gentoo.org/905934
++src_configure() {
++	econf \
++		ac_cv_path_BASH="${EPREFIX}/bin/bash" \
++		ac_cv_path_ENV_UPDATE="${EPREFIX}/usr/sbin/env-update"
++}
++
+ src_compile() {
+ 	emake
+ 	use doc && emake html
+diff --git a/dev-libs/gmp/gmp-6.2.1-r5.ebuild b/dev-libs/gmp/gmp-6.2.1-r5.ebuild
+index 585425499..a32e1c107 100644
+--- a/dev-libs/gmp/gmp-6.2.1-r5.ebuild
++++ b/dev-libs/gmp/gmp-6.2.1-r5.ebuild
+@@ -35,7 +35,10 @@ RESTRICT="!cpudetection? ( bindist )"
+ BDEPEND="
+ 	app-arch/xz-utils
+ 	sys-devel/m4
++	sys-devel/flex
++	sys-devel/bison
+ "
++# https://bugs.gentoo.org/905905
+ 
+ DOCS=( AUTHORS ChangeLog NEWS README doc/configuration doc/isa_abi_headache )
+ HTML_DOCS=( doc )
+diff --git a/sys-apps/portage/portage-3.0.44-r1.ebuild b/sys-apps/portage/portage-3.0.44-r1.ebuild
+index f6c5de541..e2df2848c 100644
+--- a/sys-apps/portage/portage-3.0.44-r1.ebuild
++++ b/sys-apps/portage/portage-3.0.44-r1.ebuild
+@@ -177,6 +177,11 @@ python_prepare_all() {
+ 	fi
+ }
+ 
++python_compile() {
++	distutils-r1_python_compile \
++		--executable="${EPREFIX}/usr/bin/${EPYTHON}"
++}
++
+ python_compile_all() {
+ 	local targets=()
+ 	use doc && targets+=( docbook )
+@@ -195,6 +200,7 @@ python_install() {
+ 	# Install sbin scripts to bindir for python-exec linking
+ 	# they will be relocated in pkg_preinst()
+ 	distutils-r1_python_install \
++		--prefix="${EPREFIX}/usr" \
+ 		--system-prefix="${EPREFIX}/usr" \
+ 		--bindir="$(python_get_scriptdir)" \
+ 		--docdir="${EPREFIX}/usr/share/doc/${PF}" \
+@@ -237,7 +243,7 @@ python_install_all() {
+ }
+ 
+ pkg_preinst() {
+-	if ! use build; then
++	if [[ -z ${ROOT} ]] && ! use build; then
+ 		python_setup
+ 		local sitedir=$(python_get_sitedir)
+ 		[[ -d ${D}${sitedir} ]] || die "${D}${sitedir}: No such directory"

patches/sys-apps/portage/portage-3.0.44-termux-disable-hardlinking.patch

@@ -0,0 +1,48 @@
+Termux: Don't create hardlinks
+
+The termux environment doesn't support hardlinking (permission denied), so we
+need to replace/stub out anything that relies on them, to at least get most of
+the functionality of the package manager to work.
+
+--- portage-3.0.44.orig/bin/estrip
++++ portage-3.0.44/bin/estrip
+@@ -281,7 +281,7 @@
+ 		dst=${dst_dirname}/${dst_basename}
+ 		if [[ ! -e ${dst} ]]; then
+ 			debug-print "creating hard link: target: '${inode_debug}' name: '${dst}'"
+-			ln -L "${inode_debug}" "${dst}" || die "failed to create hard link '${dst}'"
++			cp -aLT "${inode_debug}" "${dst}" || die "failed to create hard link '${dst}'"
+ 		fi
+ 	else
+ 		dst_basename=${src_basename}.debug
+@@ -340,7 +340,7 @@
+ 	# So, use a lockfile to prevent interference (easily observed with
+ 	# dev-vcs/git which creates ~111 hardlinks to one file in
+ 	# /usr/libexec/git-core).
+-	while ! ln "${inode_link}" "${lockfile}" 2>/dev/null; do
++	while ! ln -s "${inode_link}" "${lockfile}" 2>/dev/null; do
+ 		(( --locktries > 0 )) || die "failed to acquire lock '${lockfile}'"
+ 		sleep 1
+ 	done
+@@ -374,9 +374,9 @@
+ 
+ 	if ${already_stripped} ; then
+ 		rm -f "${x}" || die "rm failed unexpectedly"
+-		ln "${inode_link}_stripped" "${x}" || die "ln failed unexpectedly"
++		cp -aT "${inode_link}_stripped" "${x}" || die "ln failed unexpectedly"
+ 	else
+-		ln "${x}" "${inode_link}_stripped" || die "ln failed unexpectedly"
++		cp -aT "${x}" "${inode_link}_stripped" || die "ln failed unexpectedly"
+ 		if [[ ${xt_data} ]] ; then
+ 			restore_xattrs <<< "${xt_data}"
+ 		fi
+--- portage-3.0.44.orig/lib/portage/locks.py
++++ portage-3.0.44/lib/portage/locks.py
+@@ -423,6 +423,7 @@
+         if e.errno not in (errno.ENOENT, errno.ESTALE):
+             _raise_exc(e)
+         return (True, None)
++    return (False, fstat_st)
+ 
+     # Since stat is not reliable for removed files on NFS with the default
+     # file attribute cache behavior ('ac' mount option), create a temporary

patches/sys-apps/portage/series

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+portage-3.0.44-termux-disable-hardlinking.patch

patches/sys-libs/glibc/glibc-2.36-termux-stub-syscalls.patch

@@ -0,0 +1,24 @@
+Termux: Stub out some syscalls
+
+These syscalls are either blacklisted in Android's seccomp policy, or simply
+not implemented by the running kernel (android kernels lag behind quite a bit!).
+
+Whichever of the two it is, calling any of these results in the process being
+killed with SIGSYS, usually killing the entire process. To prevent this, we
+stub them with an ENOSYS result, pretending they aren't implemented.
+
+--- glibc-2.36.orig/sysdeps/unix/sysv/linux/aarch64/sysdep.h
++++ glibc-2.36/sysdeps/unix/sysv/linux/aarch64/sysdep.h
+@@ -167,7 +167,11 @@
+ # undef INTERNAL_SYSCALL_RAW
+ # define INTERNAL_SYSCALL_RAW(name, nr, args...)		\
+   ({ long _sys_result;						\
+-     {								\
++     switch (name) { \
++     case SYS_ify(set_robust_list): \
++     case SYS_ify(rseq): \
++     case SYS_ify(faccessat2): \
++     _sys_result = -ENOSYS; break; default: \
+        LOAD_ARGS_##nr (args)					\
+        register long _x8 asm ("x8") = (name);			\
+        asm volatile ("svc	0	// syscall " # name     \

patches/sys-libs/glibc/series

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+glibc-2.36-termux-stub-syscalls.patch

portage/env/dev-lang/perl

@@ -0,0 +1,5 @@
+# The ebuild uses the perl-cross build system when it detects a cross build
+# The regular perl build system sucks in general but breaks spectacularly in a
+#  setup like this, so it's best to avoid
+
+tc-is-cross-compiler() { true; }

portage/package.use

@@ -0,0 +1,5 @@
+dev-vcs/git -curl -gpg -perl -webdav -nls
+app-editors/vim -crypt -nls
+app-portage/portage-utils -qmanifest
+sys-devel/m4 -nls
+sys-apps/help2man -nls