67 lines
2.4 KiB
Plaintext
67 lines
2.4 KiB
Plaintext
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#!/bin/bash
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# This is a small wrapper script for gpg intended to be used by git
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# As far as I can tell, git cannot automatically pick a fallback signing key by itself
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# Setting GIT_SIGN_FALLBACK_KEY_IDS="config" or leaving it unset will make the program try all keys listed by git config
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# Setting GIT_SIGN_FALLBACK_KEY_IDS="all" will make the program try all keys listed by gpg
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# Setting the fallback keys manually can be done like this: GIT_SIGN_FALLBACK_KEY_IDS="<key id 1> <key id 2>"
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# This script was written in about two hours, if you find any bugs, tell Luca!
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set -eu
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# A quick and dirty array filtering function
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function reject {
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predicate=$1
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shift
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for el in "$@"; do
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if ! eval ":() { [[ $predicate ]]; }; : '$el'"; then
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echo "$el"
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fi
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done
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}
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case "$*" in
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# Git is trying to sign a commit
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*-bsau*)
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# The key passed by git
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primary_key=$(echo "$*" | grep -oP '(?<=-bsau )[A-Z0-9]{16}')
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# Select fallback keys based on config
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case "${GIT_SIGN_FALLBACK_KEY_IDS:-}" in
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"" | "config")
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mapfile -t signing_keys < <(git config --get-all user.signingKey)
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mapfile -t fallback_keys < <(reject "\$1 == $primary_key" "${signing_keys[@]}")
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;;
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"all")
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mapfile -t signing_keys < <(gpg --list-keys --with-colons | awk -F: '/^pub:/ {print $5}')
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mapfile -t fallback_keys < <(reject "\$1 == $primary_key" "${signing_keys[@]}")
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;;
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*)
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mapfile -t fallback_keys < <(echo "$GIT_SIGN_FALLBACK_KEY_IDS" | xargs -n 1)
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;;
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esac
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# Number of signing keys
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n_keys=$(($(echo "${fallback_keys[*]}" | wc -w) + 1))
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# Unaccounted for gpg flags
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mapfile -t extra_flags < <(reject "\$1 == -bsau || \$1 == --status-fd=2 || \$1 == $primary_key" "$@")
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gpg_flags=("${extra_flags[@]}" --status-fd=2 -bsau)
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# Try signing with the primary key first, then try the fallback keys
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counter=0
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try_key=$primary_key
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while
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[ "$counter" -lt "$n_keys" ] &&
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! gpg "${gpg_flags[@]}" "$try_key"
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do
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try_key="${fallback_keys[$counter - 1]}"
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counter=$((counter + 1))
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done
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;;
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# Git is trying to do something else, so we just pass the flags through
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*) gpg "$@" ;;
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esac
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