base-files: automatically handle paths and symlinks for RAMFS_COPY_BIN

Depending on busybox applet selection, paths of basic utiilties may differ,
and may not work as symlinks to busybox. Simply using whatever binary is
found in PATH and detecting symlinks automatically is more robust and
easier to maintain.

The list of binaries is also slightly cleaned up and duplicates are
removed.

Signed-off-by: Matthias Schiffer <mschiffer@universe-factory.net>

10 files changed, 40 insertions, 46 deletions

diff --git a/package/base-files/files/lib/upgrade/common.sh b/package/base-files/files/lib/upgrade/common.sh
index c8b7101..428ec73 100644
--- a/package/base-files/files/lib/upgrade/common.sh
+++ b/package/base-files/files/lib/upgrade/common.sh
@@ -6,28 +6,33 @@ RAM_ROOT=/tmp/root
 libs() { ldd $* 2>/dev/null | sed -r 's/(.* => )?(.*) .*/\2/'; }
 
 install_file() { # <file> [ <file> ... ]
+	local target dest dir
 	for file in "$@"; do
+		if [ -L "$file" ]; then
+			target="$(readlink -f "$file")"
+			dest="$RAM_ROOT/$file"
+			[ ! -f "$dest" ] && {
+				dir="$(dirname "$dest")"
+				mkdir -p "$dir"
+				ln -s "$target" "$dest"
+			}
+			file="$target"
+		fi
 		dest="$RAM_ROOT/$file"
-		[ -f $file -a ! -f $dest ] && {
-			dir="$(dirname $dest)"
+		[ -f "$file" -a ! -f "$dest" ] && {
+			dir="$(dirname "$dest")"
 			mkdir -p "$dir"
-			cp $file $dest
+			cp "$file" "$dest"
 		}
 	done
 }
 
-install_bin() { # <file> [ <symlink> ... ]
+install_bin() {
+	local src files
 	src=$1
 	files=$1
 	[ -x "$src" ] && files="$src $(libs $src)"
 	install_file $files
-	shift
-	for link in "$@"; do {
-		dest="$RAM_ROOT/$link"
-		dir="$(dirname $dest)"
-		mkdir -p "$dir"
-		[ -f "$dest" ] || ln -s $src $dest
-	}; done
 }
 
 run_hooks() {
diff --git a/package/base-files/files/lib/upgrade/stage2 b/package/base-files/files/lib/upgrade/stage2
index 9d12cc8..5a439f1 100755
--- a/package/base-files/files/lib/upgrade/stage2
+++ b/package/base-files/files/lib/upgrade/stage2
@@ -17,6 +17,9 @@ export VERBOSE=1
 export CONFFILES=/tmp/sysupgrade.conffiles
 export CONF_TAR=/tmp/sysupgrade.tgz
 
+RAMFS_COPY_BIN=		# extra programs for temporary ramfs root
+RAMFS_COPY_DATA=	# extra data files
+
 
 [ -f "$CONF_TAR" ] || export SAVE_CONFIG=0
 [ -f /tmp/sysupgrade.always.overwrite.bootdisk.partmap ] && export SAVE_PARTITIONS=0
@@ -41,32 +44,20 @@ supivot() { # <new_root> <old_root>
 }
 
 switch_to_ramfs() {
-	install_bin /bin/busybox /bin/ash /bin/sh /bin/mount /bin/umount	\
-		/sbin/pivot_root /sbin/reboot /bin/sync /bin/dd	/bin/grep       \
-		/bin/cp /bin/mv /bin/tar /usr/bin/md5sum "/usr/bin/[" /bin/dd	\
-		/bin/vi /bin/ls /bin/cat /usr/bin/awk /usr/bin/hexdump		\
-		/bin/sleep /bin/zcat /usr/bin/bzcat /usr/bin/printf /usr/bin/wc \
-		/bin/cut /usr/bin/printf /bin/sync /bin/mkdir /bin/rmdir	\
-		/bin/rm /usr/bin/basename /bin/kill /bin/chmod /usr/bin/find \
-		/bin/mknod /bin/touch /bin/sed
-
-	install_bin /sbin/mtd
-	install_bin /sbin/mount_root
-	install_bin /sbin/snapshot
-	install_bin /sbin/snapshot_tool
-	install_bin /usr/sbin/ubiupdatevol
-	install_bin /usr/sbin/ubiattach
-	install_bin /usr/sbin/ubiblock
-	install_bin /usr/sbin/ubiformat
-	install_bin /usr/sbin/ubidetach
-	install_bin /usr/sbin/ubirsvol
-	install_bin /usr/sbin/ubirmvol
-	install_bin /usr/sbin/ubimkvol
-	install_bin /usr/sbin/partx
-	install_bin /usr/sbin/losetup
-	install_bin /usr/sbin/mkfs.ext4
-	for file in $RAMFS_COPY_BIN; do
-		install_bin ${file//:/ }
+	for binary in \
+		/bin/busybox /bin/ash /bin/sh /bin/mount /bin/umount	\
+		pivot_root mount_root reboot sync kill sleep		\
+		md5sum hexdump cat zcat bzcat dd tar			\
+		ls basename find cp mv rm mkdir rmdir mknod touch chmod \
+		'[' printf wc grep awk sed cut				\
+		mtd partx losetup mkfs.ext4				\
+		ubiupdatevol ubiattach ubiblock ubiformat		\
+		ubidetach ubirsvol ubirmvol ubimkvol			\
+		snapshot snapshot_tool					\
+		$RAMFS_COPY_BIN
+	do
+		local file="$(which "$binary" 2>/dev/null)"
+		[ -n "$file" ] && install_bin "$file"
 	done
 	install_file /etc/resolv.conf /lib/*.sh /lib/functions/*.sh /lib/upgrade/*.sh $RAMFS_COPY_DATA
 
diff --git a/package/base-files/files/sbin/sysupgrade b/package/base-files/files/sbin/sysupgrade
index 809e789..359f21f 100755
--- a/package/base-files/files/sbin/sysupgrade
+++ b/package/base-files/files/sbin/sysupgrade
@@ -4,8 +4,6 @@
 . /lib/functions/system.sh
 
 # initialize defaults
-RAMFS_COPY_BIN=""	# extra programs for temporary ramfs root
-RAMFS_COPY_DATA=""	# extra data files
 export MTD_CONFIG_ARGS=""
 export INTERACTIVE=0
 export VERBOSE=1
diff --git a/target/linux/ar71xx/base-files/lib/upgrade/platform.sh b/target/linux/ar71xx/base-files/lib/upgrade/platform.sh
index cf51fe2..ba65a79 100755
--- a/target/linux/ar71xx/base-files/lib/upgrade/platform.sh
+++ b/target/linux/ar71xx/base-files/lib/upgrade/platform.sh
@@ -7,7 +7,7 @@
 
 PART_NAME=firmware
 RAMFS_COPY_DATA=/lib/ar71xx.sh
-[ -x /usr/sbin/nandwrite ] && RAMFS_COPY_BIN=/usr/sbin/nandwrite
+RAMFS_COPY_BIN='nandwrite'
 
 CI_BLKSZ=65536
 CI_LDADR=0x80060000
diff --git a/target/linux/bcm53xx/base-files/lib/upgrade/platform.sh b/target/linux/bcm53xx/base-files/lib/upgrade/platform.sh
index 6a9e495..1f778c7 100644
--- a/target/linux/bcm53xx/base-files/lib/upgrade/platform.sh
+++ b/target/linux/bcm53xx/base-files/lib/upgrade/platform.sh
@@ -1,4 +1,4 @@
-RAMFS_COPY_BIN='/usr/bin/osafeloader /usr/bin/oseama'
+RAMFS_COPY_BIN='osafeloader oseama'
 
 PART_NAME=firmware
 
diff --git a/target/linux/ipq806x/base-files/lib/upgrade/platform.sh b/target/linux/ipq806x/base-files/lib/upgrade/platform.sh
index 141058f..246361b 100644
--- a/target/linux/ipq806x/base-files/lib/upgrade/platform.sh
+++ b/target/linux/ipq806x/base-files/lib/upgrade/platform.sh
@@ -3,7 +3,7 @@
 PART_NAME=firmware
 REQUIRE_IMAGE_METADATA=1
 
-RAMFS_COPY_BIN='/usr/sbin/fw_printenv /usr/sbin/fw_setenv'
+RAMFS_COPY_BIN='fw_printenv fw_setenv'
 RAMFS_COPY_DATA='/etc/fw_env.config /var/lock/fw_printenv.lock'
 
 platform_check_image() {
diff --git a/target/linux/kirkwood/base-files/lib/upgrade/platform.sh b/target/linux/kirkwood/base-files/lib/upgrade/platform.sh
index c8c66c1..f75acb0 100644
--- a/target/linux/kirkwood/base-files/lib/upgrade/platform.sh
+++ b/target/linux/kirkwood/base-files/lib/upgrade/platform.sh
@@ -1,6 +1,6 @@
 . /lib/kirkwood.sh
 
-RAMFS_COPY_BIN='/usr/sbin/fw_printenv /usr/sbin/fw_setenv'
+RAMFS_COPY_BIN='fw_printenv fw_setenv'
 RAMFS_COPY_DATA='/etc/fw_env.config /var/lock/fw_printenv.lock'
 
 platform_check_image() {
diff --git a/target/linux/mvebu/base-files/lib/upgrade/platform.sh b/target/linux/mvebu/base-files/lib/upgrade/platform.sh
index 8085634..dd21c09 100755
--- a/target/linux/mvebu/base-files/lib/upgrade/platform.sh
+++ b/target/linux/mvebu/base-files/lib/upgrade/platform.sh
@@ -5,7 +5,7 @@
 
 . /lib/mvebu.sh
 
-RAMFS_COPY_BIN='/usr/sbin/fw_printenv /usr/sbin/fw_setenv'
+RAMFS_COPY_BIN='fw_printenv fw_setenv'
 RAMFS_COPY_DATA='/lib/mvebu.sh /etc/fw_env.config /var/lock/fw_printenv.lock'
 REQUIRE_IMAGE_METADATA=1
 
diff --git a/target/linux/pistachio/base-files/lib/upgrade/platform.sh b/target/linux/pistachio/base-files/lib/upgrade/platform.sh
index ee5d506..4edc06b 100755
--- a/target/linux/pistachio/base-files/lib/upgrade/platform.sh
+++ b/target/linux/pistachio/base-files/lib/upgrade/platform.sh
@@ -6,7 +6,7 @@
 # See /LICENSE for more information.
 #
 
-RAMFS_COPY_BIN="/usr/sbin/fw_printenv /usr/sbin/fw_setenv /bin/mkdir /bin/dmesg /bin/sed /bin/grep"
+RAMFS_COPY_BIN='fw_printenv fw_setenv dmesg'
 RAMFS_COPY_DATA="/etc/fw_env.config"
 REQUIRE_IMAGE_METADATA=0
 
diff --git a/target/linux/rb532/base-files/lib/upgrade/platform.sh b/target/linux/rb532/base-files/lib/upgrade/platform.sh
index 29fe18d..bfa73a7 100644
--- a/target/linux/rb532/base-files/lib/upgrade/platform.sh
+++ b/target/linux/rb532/base-files/lib/upgrade/platform.sh
@@ -1,5 +1,5 @@
 REQUIRE_IMAGE_METADATA=1
-RAMFS_COPY_BIN=/usr/sbin/nandwrite
+RAMFS_COPY_BIN='nandwrite'
 CI_KERNPART=none
 
 platform_check_image() {