Add version check and update subcommands for CLI self-update#154
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Adds `apppack version check` to check for available updates and `apppack version update` to download and install the latest release from GitHub. Features: - Cross-platform support (Linux, macOS Intel/ARM, Windows) - SHA256 checksum verification before binary replacement - Blocks Homebrew installs with helpful upgrade message - Safe binary replacement with atomic rename and fallbacks - --force flag to update even when already on latest version
Use io.CopyN with a 100MB limit instead of io.Copy when extracting binaries from archives to prevent decompression bomb attacks. Addresses GO-S2110 (CWE-409)
# Conflicts: # CHANGELOG.md # cmd/version.go
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Supersedes #111 (fork branch had merge conflicts with
mainafter 4.7.0 was cut). Same change, rebased/merged onto currentmainwith conflicts resolved (CHANGELOG entries moved under[Unreleased],versionInfo/--jsonfrom main kept alongside the newforceUpdateflag).Original author: @SmileyChris.
Summary
apppack version checkto check for available updatesapppack version updateto download and install the latest release from GitHub--forceflag to update even when already on latest versionFeatures
brew upgrade apppackmessageNotes
io.CopyNsilent-truncation edge case tracked in selfupdate: io.CopyN can silently truncate an oversized binary #153.