nixpkgs/pkgs/build-support/appimage/appimage-exec.sh

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#!@shell@
# shellcheck shell=bash
if [ -n "$DEBUG" ] ; then
set -x
fi
PATH="@path@:$PATH"
apprun_opt=true
OWD=$(readlink -f .)
# can be read by appimages: https://docs.appimage.org/packaging-guide/environment-variables.html
export OWD
# src : AppImage
# dest : let's unpack() create the directory
unpack() {
local src="$1"
local out="$2"
# https://github.com/AppImage/libappimage/blob/ca8d4b53bed5cbc0f3d0398e30806e0d3adeaaab/src/libappimage/utils/MagicBytesChecker.cpp#L45-L63
local appimageSignature;
appimageSignature="$(LC_ALL=C readelf -h "$src" | awk 'NR==2{print $10$11;}')"
local appimageType;
appimageType="$(LC_ALL=C readelf -h "$src" | awk 'NR==2{print $12;}')"
# check AppImage signature
if [ "$appimageSignature" != "4149" ]; then
echo "Not an AppImage file"
exit
fi
case "$appimageType" in
"01")
echo "Uncompress $(basename "$src") of type $appimageType"
mkdir "$out"
pv "$src" | bsdtar -x -C "$out" -f -
;;
"02")
# This method avoid issues with non executable appimages,
# non-native packer, packer patching and squashfs-root destination prefix.
# multiarch offset one-liner using same method as AppImage
# see https://gist.github.com/probonopd/a490ba3401b5ef7b881d5e603fa20c93
offset=$(LC_ALL=C readelf -h "$src" | awk 'NR==13{e_shoff=$5} NR==18{e_shentsize=$5} NR==19{e_shnum=$5} END{print e_shoff+e_shentsize*e_shnum}')
echo "Uncompress $(basename "$src") of type $appimageType @ offset $offset"
unsquashfs -q -d "$out" -o "$offset" "$src"
chmod go-w "$out"
;;
# "03")
# get ready, https://github.com/TheAssassin/type3-runtime
*)
echo Unsupported AppImage Type: "$appimageType"
exit
;;
esac
echo "$(basename "$src") is now installed in $out"
}
apprun() {
SHA256=$(sha256sum "$APPIMAGE" | awk '{print $1}')
export APPDIR="${XDG_CACHE_HOME:-$HOME/.cache}/appimage-run/$SHA256"
#compatibility
if [ -x "$APPDIR/squashfs-root" ]; then APPDIR="$APPDIR/squashfs-root"; fi
if [ ! -x "$APPDIR" ]; then
mkdir -p "$(dirname "$APPDIR")"
unpack "$APPIMAGE" "$APPDIR"
else echo "$(basename "$APPIMAGE")" installed in "$APPDIR"
fi
export PATH="$PATH:$PWD/usr/bin"
}
wrap() {
# quite same in appimageTools
export APPIMAGE_SILENT_INSTALL=1
if [ -n "$APPIMAGE_DEBUG_EXEC" ]; then
cd "$APPDIR" || true
exec "$APPIMAGE_DEBUG_EXEC"
fi
exec "$APPDIR/AppRun" "$@"
}
usage() {
cat <<EOF
Usage: appimage-run [appimage-run options] <AppImage> [AppImage options]
-h show this message
-d debug mode
-x <directory> : extract appimage in the directory then exit.
-w <directory> : run uncompressed appimage directory (used in appimageTools)
[AppImage options]: Options are passed on to the appimage.
If you want to execute a custom command in the appimage's environment, set the APPIMAGE_DEBUG_EXEC environment variable.
EOF
exit 1
}
while getopts "x:w:dh" option; do
case "${option}" in
d) set -x
;;
x) # eXtract
unpack_opt=true
APPDIR=${OPTARG}
;;
w) # WrapAppImage
export APPDIR=${OPTARG}
wrap_opt=true
;;
h) usage
;;
*) usage
;;
esac
done
shift "$((OPTIND-1))"
if [ -n "$wrap_opt" ] && [ -d "$APPDIR" ]; then
wrap "$@"
exit
else
APPIMAGE="$(realpath "$1")" || usage
shift
fi
if [ -n "$unpack_opt" ] && [ -f "$APPIMAGE" ]; then
unpack "$APPIMAGE" "$APPDIR"
exit
fi
if [ -n "$apprun_opt" ] && [ -f "$APPIMAGE" ]; then
apprun
wrap "$@"
exit
fi