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tools.ssh-agent-pick: init
author
lassulus
date
(Oct 3, 2026, 10:55 AM CEST)
commit
7bfe22b3
7bfe22b371f6785c5a2805fe9009ea8d45d08beb
parent
f0f41c1f
f0f41c1f4c16215a7442bc5e7e51ebdb37b6ab52
+70
+20
tools/ssh-agent-pick/flake-module.nix
+20
tools/ssh-agent-pick/flake-module.nix
···
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{ ... }:
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{
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perSystem =
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{ pkgs, ... }:
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{
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packages.ssh-agent-pick =
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(pkgs.writeShellApplication {
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name = "ssh-agent-pick";
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runtimeInputs = [
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pkgs.coreutils
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pkgs.findutils
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pkgs.fzf
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pkgs.gawk
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pkgs.openssh
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];
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text = builtins.readFile ./ssh-agent-pick.sh;
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}).overrideAttrs
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{ passthru.usage = builtins.readFile ./usage.kdl; };
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};
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}
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tools/ssh-agent-pick/ssh-agent-pick.sh
+48
tools/ssh-agent-pick/ssh-agent-pick.sh
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#!/usr/bin/env bash
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# Pick one of your live forwarded SSH agents and print an export line.
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# Usage: eval "$(ssh-agent-pick)"
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uid=$(id -u)
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cands=()
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labels=()
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# newest first: sshd creates the socket when the connection is established
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while IFS= read -r -d '' line; do
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sock=${line#* }
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[ -S "$sock" ] || continue
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[ "$(stat -c %u "$sock")" = "$uid" ] || continue
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rc=0
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keys=$(SSH_AUTH_SOCK=$sock ssh-add -l 2>/dev/null) || rc=$?
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[ "$rc" -le 1 ] || continue # 2 = cannot connect (stale)
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if [ "$rc" -eq 1 ]; then
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keys="(no identities)"
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else
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keys=$(printf '%s\n' "$keys" | awk '{ $1 = $2 = ""; $NF = ""; sub(/^ +/, ""); sub(/ +$/, ""); print }' | paste -sd, -)
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fi
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since=$(date -d "@${line%% *}" '+%F %T')
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cands+=("$sock")
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labels+=("$since $keys $sock")
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done < <(find /tmp/ssh-* "$HOME/.ssh/agent" -maxdepth 1 -type s \( -name 'agent.*' -o -name '*.sshd.*' \) \
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-printf '%T@ %p\0' 2>/dev/null | sort -zrn)
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if [ ${#cands[@]} -eq 0 ]; then
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echo "ssh-agent-pick: no live forwarded agent found" >&2
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exit 1
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fi
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if [ ${#cands[@]} -eq 1 ]; then
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choice=${cands[0]}
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elif [ -t 2 ]; then
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sel=$(printf '%s\n' "${labels[@]}" | fzf --height=~10 --reverse --prompt='agent> ') || exit 1
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choice=${sel##* }
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else
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PS3='agent> '
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select _ in "${labels[@]}"; do
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[ -n "${REPLY:-}" ] && [ "$REPLY" -ge 1 ] 2>/dev/null && [ "$REPLY" -le ${#cands[@]} ] || continue
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choice=${cands[REPLY - 1]}
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break
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done
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fi
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[ -n "${choice:-}" ] || exit 1
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printf "export SSH_AUTH_SOCK='%s'\n" "$choice"