*: refactor

Documentation will be rewritten and added later.

lib/common.sh

@@ -0,0 +1,160 @@
+# vim: set ft=sh:
+# shellcheck shell=sh
+#
+# https://shellcheck.net/wiki/SC2154
+# shellcheck disable=2154
+
+print()
+{
+    printf "%s %s\n" "${2:-">>"}" "$1"
+}
+
+panic()
+{
+    print "${1:-unexpected error occurred}" '!>' >&2
+
+    if [ "$$" = 1 ]; then
+        sh
+    else
+        exit 1
+    fi
+}
+
+# random()
+# {
+#     _sum=$(cksum < /proc/uptime)
+#     printf '%s' "${sum% *}"
+# }
+
+# TODO ensure correctness
+copy_file()
+(
+    file=$1; dest=$2
+
+    [ -e "${tmpdir}/${dest}" ] && return
+
+    while [ -h "$file" ]; do
+        mkdir -p "${tmpdir}/${file%/*}"
+        cp -P "$file" "${tmpdir}/${file}"
+        cd -P "${file%/*}" || exit
+
+        symlink=$(ls -ld "$file")
+        symlink=${symlink##* -> }
+
+        case $symlink in
+            /*) file=$symlink ;;
+            *)  file="${PWD}/${symlink##*/}" ;;
+        esac
+    done
+
+    [ -h "${tmpdir}/${dest}" ] && dest=$file
+
+    mkdir -p "${tmpdir}/${dest%/*}"
+    cp "$file" "${tmpdir}/${dest}"
+
+    [ "$3" ] && chmod "$3" "${tmpdir}/${dest}"
+
+    # https://shellcheck.net/wiki/SC2015
+    # shellcheck disable=2015
+    [ "$4" ] && strip "${tmpdir}/${dest}" > /dev/null 2>&1 || :
+)
+
+copy_exec()
+{
+    _bin=$(command -v "$1")
+
+    case $_bin in /*) ;;
+        '')
+            panic "unable to find command: $1"
+        ;;
+        *)
+            # https://shellcheck.net/wiki/SC2086
+            # shellcheck disable=2086
+            { IFS=:; set -- $PATH; unset IFS; }
+
+            for _dir; do
+                __bin="${_dir}/${_bin}"
+
+                [ -x "$__bin" ] && break
+            done
+
+            # https://shellcheck.net/wiki/SC2015
+            # shellcheck disable=2015
+            [ -x "$__bin" ] && _bin=$__bin || panic "unable to find command: $_bin"
+        ;;
+    esac
+
+    copy_file "$_bin" "/bin/${_bin##*/}" 0755 1
+
+    # TODO copy libs to the directory of interpreter.
+    ldd "$_bin" 2> /dev/null |
+
+    while read -r _lib || [ "$_lib" ]; do
+        _lib=${_lib#* => }
+        _lib=${_lib% *}
+
+        [ -e "$_lib" ] && copy_file "$_lib" "$_lib" 0755 1
+    done
+}
+
+copy_kmod()
+{
+    modprobe -S "$kernel" -D "$1" 2> /dev/null |
+
+    while read -r _ _mod || [ "$_mod" ]; do
+        case $_mod in /*) copy_file "$_mod" "$_mod" 0644; esac
+    done
+}
+
+# TODO allow full path to hook
+copy_hook()
+{
+    for _dir in "${local+./hook}" /etc/tinyramfs/hook.d /lib/tinyramfs/hook.d; do
+        _hook="${_dir}/${1}/${1}"
+        [ -f "$_hook" ] && break
+    done
+
+    [ -f "$_hook" ] || panic "unable to find hook: $1"
+
+    for _ext in init init.late; do
+        [ -f "${_hook}.${_ext}" ] || continue
+
+        print "copying hook: ${1}.${_ext}"
+
+        copy_file "${_hook}.${_ext}" "/lib/tinyramfs/hook.d/${1}/${1}.${_ext}" 0644
+    done
+
+    print "evaluating hook: $1"
+
+    # https://shellcheck.net/wiki/SC1090
+    # shellcheck disable=1090
+    . "$_hook"
+}
+
+resolve_device()
+{
+    device=$1; _count=${2:-30}
+
+    case ${device%%=*} in
+        UUID)     device="/dev/disk/by-uuid/${device#*=}"     ;;
+        LABEL)    device="/dev/disk/by-label/${device#*=}"    ;;
+        PARTUUID) device="/dev/disk/by-partuuid/${device#*=}" ;;
+        /dev/*)          ;;
+        *)        return ;;
+    esac
+
+    # Race condition may occur if device manager is not yet initialized device.
+    # To fix this, we simply waiting until device is available. If device
+    # didn't appear in specified time, we panic.
+    while :; do
+        if [ -b "$device" ]; then
+            return
+        elif [ "$((_count -= 1))" = 0 ]; then
+            break
+        else
+            sleep 1
+        fi
+    done
+
+    panic "failed to lookup partition: $device"
+}