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next-gen implementation of appimagespec?: https://github.com/probonopd/go-appimage
manual creation of appimage needs spec-complicant (contains AppRun exectuable)
squashfs filesystem appeneded to their runtime:
mksquashfs Your.AppDir Your.squashfs -root-owned -noappend
cat runtime >> Your.AppImage
cat Your.squashfs >> Your.AppImage
The runtime elf binary contains empty sections, that are used to embed metadata:
- update information
- md5 digest
- sha256 signature
- signing key
appimageupdate[tool]supports consuming updates from static file server, github releases: https://github.com/AppImage/AppImageSpec/blob/master/draft.md#update-information
- https://docs.appimage.org/packaging-guide/optional/signatures.html
- using local gpg key:
appimagetool --sign --sign-key <KEY_ID> <SOURCE> - embeds the signature into ELF section
.sig_key - is not part of the spec
- has issues with gpg keys containing subkeys: AppImage/AppImageKit#1010
- https://docs.appimage.org/packaging-guide/optional/appstream.html
- https://www.freedesktop.org/software/appstream/metainfocreator
- https://www.freedesktop.org/software/appstream/docs/chap-Metadata.html
$ docker build -t appimage-demo -f Dockerfile .
$ docker run --rm -it \
--mount=type=bind,src=$PWD,target=/src \
--mount=type=volume,src=appimage-tmp,target=/tmp \
--workdir=/src \
appimage-demo \
make bundle
usage: demo
-U self-update
-v print information
-h show this help