Samueru-sama
commented
2 months ago Usually (99% of the cases) the AppDir contains a script named AppRun that sets a few env variables, including the current location of the program and then starts it.
However access to files in usr/ is done by linuxdeploy as it patches the binary to have its path relative to the usr inside the appimage instead of /usr from the filesystem.
that way it can always find what it needs without needing to use stuff like LD_PRELOAD or LD_LIBRARY_PATH.
You can also change the default behavior of the program this way, for example here is how the AppRun of my mpv appimage looks like:
#!/bin/sh
CURRENTDIR="$(dirname "$(readlink -f "$0")")"
if [ -z "$@" ]; then
"$CURRENTDIR/usr/bin/mpv" --player-operation-mode=pseudo-gui
else
"$CURRENTDIR/usr/bin/mpv" "$@"
fiBy default mpv doesn't launch its GUI when you run the binary (double click on the appimage) this change makes it do so.
And here is the AppRun of suyu which is a bit more complex:
#!/bin/sh -e
# A shell script that does the same as the binaries in the release section.
cd "$(dirname "$0")"
cxxpre=""
gccpre=""
execpre=""
libc6arch="libc6,x86-64"
exec="./bin/$(sed -n -e 's|%f||' -e 's|^Exec=||p' $(ls -1 *.desktop))"
if [ -n "$APPIMAGE" ] && [ "$(file -b "$APPIMAGE" | cut -d, -f2)" != " x86-64" ]; then
libc6arch="libc6"
fi
cd "usr"
if [ -e "./optional/libstdc++/libstdc++.so.6" ]; then
lib="$(PATH="/sbin:$PATH" ldconfig -p | grep "libstdc++\.so\.6 ($libc6arch)" | awk 'NR==1{print $NF}')"
sym_sys=$(tr '\0' '\n' < "$lib" | grep -e '^GLIBCXX_3\.4' | sort -V | tail -n1)
sym_app=$(tr '\0' '\n' < "./optional/libstdc++/libstdc++.so.6" | grep -e '^GLIBCXX_3\.4' | sort -V | tail -n1)
if [ "$(printf "${sym_sys}\n${sym_app}"| sort -V | tail -1)" != "$sym_sys" ]; then
cxxpath="./optional/libstdc++:"
fi
fi
if [ -e "./optional/libgcc/libgcc_s.so.1" ]; then
lib="$(PATH="/sbin:$PATH" ldconfig -p | grep "libgcc_s\.so\.1 ($libc6arch)" | awk 'NR==1{print $NF}')"
sym_sys=$(tr '\0' '\n' < "$lib" | grep -e '^GCC_[0-9]\\.[0-9]' | sort -V | tail -n1)
sym_app=$(tr '\0' '\n' < "./optional/libgcc/libgcc_s.so.1" | grep -e '^GCC_[0-9]\\.[0-9]' | sort -V | tail -n1)
if [ "$(printf "${sym_sys}\n${sym_app}"| sort -V | tail -1)" != "$sym_sys" ]; then
gccpath="./optional/libgcc:"
fi
fi
if [ -n "$cxxpath" ] || [ -n "$gccpath" ]; then
if [ -e "./optional/exec.so" ]; then
execpre=""
export LD_PRELOAD="./optional/exec.so:${LD_PRELOAD}"
fi
export LD_LIBRARY_PATH="${cxxpath}${gccpath}${LD_LIBRARY_PATH}"
fi
# Force xcb platform for Qt applications
if [ -z "${QT_QPA_PLATFORM}" ]; then
export QT_QPA_PLATFORM=xcb
fi
# Find correct root CA file
_POSSIBLE_CERTIFICATES="/etc/ssl/certs/ca-bundle.crt \
/etc/ssl/certs/ca-certificates.crt /etc/pki/tls/certs/ca-bundle.crt \
/etc/ssl/ca-bundle.pem /etc/pki/tls/cacert.pem"
if [ -z "$SSL_CERT_FILE" ]; then
for i in $_POSSIBLE_CERTIFICATES; do
if [ -f "$i" ]; then
export SSL_CERT_FILE="$i"
break
fi
done
fi
#echo ">>>>> $LD_LIBRARY_PATH"
#echo ">>>>> $LD_PRELOAD"
exec $exec "$@"
xplshn
@Samueru-sama Sorry to bother you, I got an initial AppDir edition working, what is different about AppImages? How do they make the programs access the shipped files under "usr/"? Any cool tricks to do this? Thanks!