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initramfs: enable DNS if network is up

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In certain situations, it is desirable for hostnames to be resolvable in
the initramfs (e.g., when a hostname is specified as the NFS server in
the "boot" or "disk" kernel parameters). If the network is up when the
init script is executed (e.g., when the "ip" kernel parameter is
specified) and a DNS server is known, write it to /etc/resolv.conf so it
can be used for DNS requests.
This commit is contained in:
Chris Novakovic 2017-07-09 00:04:01 +01:00 committed by chewitt
parent dce9240b0d
commit 635d8b2988
4 changed files with 16 additions and 1 deletions
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3
packages/devel/glibc/config/nsswitch-init.conf Normal file
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@ -0,0 +1,3 @@
# This is just enough to get DNS resolution working in the initramfs
hosts: dns

0
packages/devel/glibc/config/nsswitch.conf → packages/devel/glibc/config/nsswitch-target.conf
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10
packages/devel/glibc/package.mk
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@ -151,7 +151,7 @@ post_makeinstall_target() {
# create default configs
mkdir -p $INSTALL/etc
cp $PKG_DIR/config/nsswitch.conf $INSTALL/etc
cp $PKG_DIR/config/nsswitch-target.conf $INSTALL/etc/nsswitch.conf
cp $PKG_DIR/config/host.conf $INSTALL/etc
cp $PKG_DIR/config/gai.conf $INSTALL/etc
@ -176,8 +176,16 @@ makeinstall_init() {
cp -PR $PKG_BUILD/.$TARGET_NAME/math/libm.so* $INSTALL/usr/lib
cp -PR $PKG_BUILD/.$TARGET_NAME/nptl/libpthread.so* $INSTALL/usr/lib
cp -PR $PKG_BUILD/.$TARGET_NAME/rt/librt.so* $INSTALL/usr/lib
cp -PR $PKG_BUILD/.$TARGET_NAME/resolv/libnss_dns.so* $INSTALL/usr/lib
cp -PR $PKG_BUILD/.$TARGET_NAME/resolv/libresolv.so* $INSTALL/usr/lib
if [ "$TARGET_ARCH" = "arm" -a "$TARGET_FLOAT" = "hard" ]; then
ln -sf ld.so $INSTALL/usr/lib/ld-linux.so.3
fi
}
post_makeinstall_init() {
# create default configs
mkdir -p $INSTALL/etc
cp $PKG_DIR/config/nsswitch-init.conf $INSTALL/etc/nsswitch.conf
}

4
packages/sysutils/busybox/scripts/init
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@ -1003,6 +1003,10 @@
[ -f "/sysroot/usr/lib/systemd/systemd" ] || error "final_check" "Could not find systemd!"
}
# If the network is up (due to the use of the "ip" kernel parameter) and a DNS
# server is known, allow the libc resolver to use it
grep '^\(nameserver\|domain\) ' /proc/net/pnp | grep -v '^nameserver 0\.0\.0\.0$' > /etc/resolv.conf
if [ "${boot%%=*}" = "FILE" ]; then
error "check arguments" "boot argument can't be FILE type..."
fi