Drop 'fetch', add 'pull', support custom gpg binaries via env.

git-sig

@@ -6,6 +6,9 @@ readonly MIN_GPG_VERSION=2.2
 readonly MIN_OPENSSL_VERSION=1.1
 readonly MIN_GETOPT_VERSION=2.33
 
+GIT_SIG_GPG_VERIFY_COMMAND=${GIT_SIG_GPG_VERIFY_COMMAND:-gpg}
+GIT_SIG_SIGN_COMMAND=${GIT_SIG_SIGN_COMMAND:-gpg}
+
 ## Private Functions
 
 ### Exit with error message
@@ -97,7 +100,7 @@ check_tools(){
 	for cmd in "$@"; do
 		command -v "$1" >/dev/null || die "Error: $cmd not found"
 		case $cmd in
-			gpg)
+			${GIT_SIG_VERIFY_COMMAND})
 				version=$(gpg --version | head -n1 | cut -d" " -f3)
 				check_version "gnupg" "${version}" "${MIN_GPG_VERSION}"
 			;;
@@ -116,7 +119,7 @@ check_tools(){
 ### Get primary UID for a given fingerprint
 get_uid(){
 	local -r fp="${1?}"
-	gpg --list-keys --with-colons "${fp}" 2>&1 \
+	${GIT_SIG_VERIFY_COMMAND} --list-keys --with-colons "${fp}" 2>&1 \
 		| awk -F: '$1 == "uid" {print $10}' \
 		| head -n1
 }
@@ -124,7 +127,7 @@ get_uid(){
 ### Get primary fingerprint for given search
 get_primary_fp(){
 	local -r search="${1?}"
-	gpg --list-keys --with-colons "${search}" 2>&1 \
+	${GIT_SIG_VERIFY_COMMAND} --list-keys --with-colons "${search}" 2>&1 \
 		| awk -F: '$1 == "fpr" {print $10}' \
 		| head -n1
 }
@@ -132,7 +135,7 @@ get_primary_fp(){
 ### Get fingerprint for a given pgp file
 get_file_fp(){
 	local -r filename="${1?}"
-	gpg --list-packets "${filename}" \
+	${GIT_SIG_VERIFY_COMMAND} --list-packets "${filename}" \
 		| grep keyid \
 		| sed 's/.*keyid //g'
 }
@@ -168,7 +171,7 @@ group_add_fp(){
 	done
 
 	echo "Adding key \"${fp}\" to group \"${group_name}\""
-	gpg --list-keys >/dev/null 2>&1
+    ${GIT_SIG_VERIFY_COMMAND} --list-keys >/dev/null 2>&1
 	printf 'group:0:%s' "${data%?}" \
 		| gpgconf --change-options gpg >/dev/null 2>&1
 }
@@ -176,7 +179,7 @@ group_add_fp(){
 ### Get fingerprints for a given group
 group_get_fps(){
 	local -r group_name=${1?}
-	gpg --with-colons --list-config group \
+	${GIT_SIG_VERIFY_COMMAND} --with-colons --list-config group \
 		| grep -i "^cfg:group:${group_name}:" \
 		| cut -d ':' -f4
 }
@@ -221,7 +224,7 @@ sig_generate(){
 	local -r body="sig:$version:$vcs_ref:$tree_hash:$review_hash:$sig_type"
 	local -r signature=$(\
 		printf "%s" "$body" \
-		| gpg \
+		| ${GIT_SIG_SIGN_COMMAND} \
 			--detach-sign \
 			--local-user "$key" \
 		| openssl base64 -A \
@@ -286,7 +289,7 @@ verify_git_note(){
 		return 1;
 	}
 	gpg_sig_raw="$(
-		gpg --verify --status-fd=1 \
+		${GIT_SIG_VERIFY_COMMAND} --verify --status-fd=1 \
 		<(printf '%s' "$sig" | openssl base64 -d -A) \
 		<(printf '%s' "$body") 2>/dev/null \
 	)"
@@ -314,7 +317,13 @@ verify_git_notes(){
 verify_git_commit(){
 	local -r ref="${1:-HEAD}"
 	local gpg_sig_raw
-	gpg_sig_raw=$(git verify-commit "$ref" --raw 2>&1)
+	gpg_sig_raw=$( \
+		git \
+			-c "gpg.program=$GIT_SIG_VERIFY_COMMAND" \
+			verify-commit "$ref" \
+			--raw \
+			2>&1 \
+	)
 	parse_gpg_status "$gpg_sig_raw"
 }
 
@@ -468,7 +477,6 @@ cmd_verify() {
 		--) shift; break ;;
 	esac done
 
-	git fetch "$remote" refs/notes/signatures:refs/notes/signatures
 	local -r head=$(git rev-parse --short HEAD)
 	if [ -n "$diff" ] && [ -z "$ref" ]; then
 		while read -r commit; do
@@ -491,49 +499,6 @@ cmd_verify() {
 	return 1
 }
 
-cmd_fetch() {
-	local opts group="" group_fps=""
-	opts="$(getopt -o g: -l group: -n "$PROGRAM" -- "$@")"
-	eval set -- "$opts"
-	while true; do case $1 in
-		-g|--group) group="${2:-1}"; shift 2 ;;
-		--) shift; break ;;
-	esac done
-	[ $# -eq 1 ] || \
-		die "Usage: $PROGRAM fetch <fingerprint> [-g,--group=<group>]"
-	local -r fingerprint=${1}
-
-	if [ -n "$group" ]; then
-		group_fps=$(group_get_fps "${group_name}")
-		if [[ "${group_fps}" == *"${fingerprint}"* ]]; then
-			echo "Key \"${fingerprint}\" is already in group \"${group}\""
-		else
-			group_add_fp "${fingerprint}" "${group}"
-		fi
-	fi
-
-	gpg --list-keys "${fingerprint}" > /dev/null 2>&1 \
-		&& echo "Key \"${fingerprint}\" is already in local keychain" \
-		&& return 0
-
-	echo "Requested key is not in keyring. Trying keyservers..."
-	for server in \
-		keys.openpgp.org \
-		ha.pool.sks-keyservers.net \
-		hkp://keyserver.ubuntu.com:80 \
-		hkp://p80.pool.sks-keyservers.net:80 \
-		pgp.mit.edu \
-	; do
-		echo "Fetching key \"${fingerprint}\" from \"${server}\"";
-		gpg \
-			--recv-key \
-			--keyserver "$server" \
-			--keyserver-options timeout=10 \
-			--recv-keys "${fingerprint}" \
-			&& break
-	done
-}
-
 cmd_add(){
 	local opts method="" push="0"
 	opts="$(getopt -o m:p:: -l method:,push:: -n "$PROGRAM" -- "$@")"
@@ -558,17 +523,27 @@ cmd_push() {
 		-r|--remote) remote="$2"; shift 2 ;;
 		--) shift; break ;;
 	esac done
-	git fetch "$remote" refs/notes/signatures:refs/notes/signatures
-	git notes --ref signatures merge -s cat_sort_uniq "${remote}"/signatures
 	git push --tags "$remote" refs/notes/signatures
 }
 
+cmd_pull() {
+	local opts remote="origin"
+	opts="$(getopt -o r: -l remote: -n "$PROGRAM" -- "$@")"
+	eval set -- "$opts"
+	while true; do case $1 in
+		-r|--remote) remote="$2"; shift 2 ;;
+		--) shift; break ;;
+	esac done
+	git fetch "$remote" refs/notes/signatures:refs/notes/${remote}/signatures
+	git notes --ref signatures merge -s cat_sort_uniq "${remote}"/signatures
+}
+
 cmd_version() {
 	cat <<-_EOF
 	==========================================
 	=    git-sig: multisig trust for git     =
 	=                                        =
-	=                  v0.3                  =
+	=                  v0.4                  =
 	=                                        =
 	= https://codeberg.org/distrust/git-sig  =
 	==========================================
@@ -587,8 +562,8 @@ cmd_usage() {
 	        Verify m-of-n signatures by given group are present for directory.
 	    git sig push [-r,--remote=<remote>]
 	        Push all signatures on current ref
-	    git sig fetch [-g,--group=<group>]
+	    git sig pull [-r,--remote=<remote>]
-	        Fetch key by fingerprint. Optionally add to group.
+	        Pull all signatures for current ref
 	    git sig help
 	        Show this text.
 	    git sig version
@@ -597,7 +572,7 @@ cmd_usage() {
 }
 
 # Verify all tools in this list are installed at needed versions
-check_tools git head cut find sort sed getopt gpg openssl
+check_tools git head cut find sort sed getopt openssl ${GIT_SIG_VERIFY_COMMAND}
 
 # Allow entire script to be namespaced based on filename
 readonly PROGRAM="${0##*/}"
@@ -607,8 +582,8 @@ case "$1" in
 	verify)            shift; cmd_verify   "$@" ;;
 	add)               shift; cmd_add      "$@" ;;
 	remove)            shift; cmd_remove   "$@" ;;
-	fetch)             shift; cmd_fetch    "$@" ;;
 	push)              shift; cmd_push     "$@" ;;
+	pull)              shift; cmd_pull     "$@" ;;
 	version|--version) shift; cmd_version  "$@" ;;
 	help|--help)       shift; cmd_usage    "$@" ;;
 	*)                        cmd_usage    "$@" ;;