add apkv, explicitly source XDG dirs in zshenv

new apkv script to make management of virtual packages easier on Alpine.
small change to explicitly source XDG user-dirs in case host doesn't

diff --git a/base/.zshenv b/base/.zshenv
index 266078376183f76bf00d9ad47e2a5ef777e241ec..1f3e1982e69593bd93ad762e6ab0a0c08d5cc131 100644 (file)
--- a/base/.zshenv
+++ b/base/.zshenv
@@ -37,6 +37,9 @@ if [[ -v _sev_reset_shell || $SHLVL == 1 ]] {
     export XDG_DATA_DIRS=~/.local/share:/usr/pkg/share:/usr/local/share:/usr/share
     export XDG_CACHE_HOME=~/tmp
     export XDG_RUNTIME_DIR=~/tmp
+    if [[ -e $XDG_CONFIG_HOME/user-dirs.dirs ]] {
+        source $XDG_CONFIG_HOME/user-dirs.dirs
+    }
 
     ## create tmp link
     t=${TMPDIR:-/tmp}/home-$LOGNAME

diff --git a/bin/apkv b/bin/apkv
new file mode 100755 (executable)
index 0000000..bf89590
--- /dev/null
+++ b/bin/apkv
@@ -0,0 +1,127 @@
+#!/bin/sh
+
+usage() {
+    echo "\
+apkv: Quickly add and remove packages to/from Alpine virtual packages.
+
+Usage:
+    $0 add <packages> <virtual>
+        Add <packages> to virtual package <virtual>. If the virtual package
+        does not exist, it will be created.
+    $0 del <packages> <virtual>
+        Remove <packages> from virtual package <virtual>. Empty virtual
+        packages are removed from world. The shorthand '$0 del * <virtual>' can
+        be used to empty <virtual>.
+    $0 list [packages]
+        List all or specific virtual packages and their contents.
+    $0 help
+        Show this help.
+
+Virtual packages must be prefixed with a dot to be managed with apkv. If one is
+not present, it will be added automatically.
+
+Methods can be shortened to their closest unambiguous forms, e.g. a, d, or l.
+However, due to implementation specifics, any string starting with those forms
+will work; that functionality is unspecified and is not guaranteed.
+
+For example, the following are equivalent:
+    apkv add syslinux .virt
+    apkv a syslinux virt
+    apkv abcdefg syslinux .virt
+
+"
+}
+
+prepend_dot() {
+    case $1 in
+        .*) printf "$1";;
+        *)  printf ".$1";;
+    esac
+}
+
+show_reqs() {
+    _pkg="$1"
+    shift >/dev/null
+    [ -z "$_pkg" ] && return 1
+    if [ $# -gt 0 ]; then
+        _list=$(echo "$(for x do echo $x; done)" | sort | uniq)
+    else
+        apk info -e "$_pkg" >/dev/null || return 1
+        _list=$(apk info -R "$_pkg" | awk 'NR > 1 && NF' | sort)
+    fi
+    echo -e "\e[1m$_pkg\e[0m:" $_list
+}
+
+method="$1"
+shift >/dev/null
+case $method in
+    l*) for x in ${*:-$(apk info | grep '^\.')}; do
+            show_reqs "$(prepend_dot "$x")"
+        done
+        exit;;
+    a*) method=add;;
+    d*) method=del;;
+    h*) usage; exit;;
+    -*) usage; exit;;
+    *)  [ -n "$method" ] && echo "Invalid method $method" >&2; usage; exit 1;;
+esac
+
+## add/del
+# get and validate packages
+pkgs=
+virt=
+for x; do
+    if [ -n "$pkgs" ]; then
+        pkgs="$pkgs $virt"
+    elif [ -n "$virt" ]; then
+        pkgs=$virt
+    fi
+    virt=$x
+done
+if [ -z "$pkgs" ]; then
+    echo 'Not enough arguments' >&2
+    usage
+    exit 1
+fi
+virt=$(prepend_dot $virt)
+# exit if database locked (99) or no package found to delete from (1)
+apk info -e "$virt" >/dev/null
+code=$?
+if [ $code -eq 99 -o \( $method = del -a $code -ne 0 \) ]; then
+    exit $code
+fi
+
+# we have validated our args, so let's prepare to run apk: get sudo command if
+# it exists and we are not already root
+# TODO: support doas
+if [ "$(id -u)" != 0 ] && command -v sudo >/dev/null 2>&1; then
+    sudo=$(command -v sudo)
+fi
+
+# handle quick delete shorthand mentioned in help
+if [ $method = del -a '*' = "$pkgs" ]; then
+    $sudo apk del "$virt"
+    exit $?
+fi
+
+currpkgs=$(apk info -R "$virt" | awk 'NR > 1 && NF')
+case $method in
+    # $(echo) construct is to use word splitting to normalize whitespace
+    add) currpkgs="$(echo $currpkgs) $pkgs";;
+    del) # XXX: there's probably a more efficient way to do this
+         for x in "$pkgs"; do
+             currpkgs=$(echo "$currpkgs" | grep -vFiw $x)
+         done;;
+esac
+
+if [ -z "$currpkgs" ]; then
+    # virtual package is empty
+    $sudo apk del "$virt"
+else
+    show_reqs "$virt" $currpkgs
+    $sudo apk add -t "$virt" $currpkgs
+fi
+# pass along sudo/apk exit code
+exit $?
+
+# vi:sw=4:sts=4:et