feat(scripts): add git-commit-update for rewriting commit identity
- Rewrites author/committer names & emails via git-filter-repo - Flags: -u/--url, -e/--email, -n/--name, -c/--auto-clone, -d/--dir - Adds safety tag; pushes heads/tags only (force+prune) - Installs git-filter-repo on Arch if missing - Comments: first-person style; generic examples; NEW_NAME/NEW_EMAIL marked “REPLACE THESE”
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bin/git-commit-update
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147
bin/git-commit-update
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#!/usr/bin/env bash
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set -euo pipefail
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# REPLACE THESE: this is the identity I want in rewritten commits
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NEW_NAME="Your Name"
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NEW_EMAIL="you@example.com"
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URL=""
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OLD_EMAILS=""
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OLD_NAMES=""
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AUTO_CLONE=false
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CLONE_DIR=""
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usage() {
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cat <<EOF
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Usage:
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git-commit-update --url <URL> [--email <old1,old2,...>] [--name <old1,old2,...>] [--auto-clone] [--dir <path>]
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git-commit-update -u <URL> [-e <old1,old2,...>] [-n <old1,old2,...>] [-c] [-d <path>]
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What it does:
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- Rewrites commit author/committer identities across the repo history:
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* any email in --email becomes: \$NEW_EMAIL
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* any name in --name becomes: \$NEW_NAME
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- Pushes branches and tags (force + prune), no PR/internal refs.
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Generic examples:
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git-commit-update -u https://git.example.com/user/repo.git \\
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-e "old-email@example.com,old-alias@example.org" \\
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-n "Old Name,Another Old Name"
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git-commit-update -u "ssh://git@git.example.com:2222/user/repo.git" -c
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EOF
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}
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# Parse args
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while [[ $# -gt 0 ]]; do
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case "$1" in
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--url|-u) URL="${2:-}"; shift 2;;
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--email|-e) OLD_EMAILS="${2:-}"; shift 2;;
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--name|-n) OLD_NAMES="${2:-}"; shift 2;;
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--auto-clone|-c) AUTO_CLONE=true; shift 1;;
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--dir|-d) CLONE_DIR="${2:-}"; shift 2;;
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-h|--help) usage; exit 0;;
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*) echo "Unknown arg: $1"; usage; exit 1;;
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esac
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done
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[[ -z "$URL" ]] && { echo "ERROR: --url is required"; usage; exit 1; }
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# I need git-filter-repo; if missing on Arch, I install it, else ask the user to install.
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if ! command -v git-filter-repo >/dev/null 2>&1; then
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if command -v pacman >/dev/null 2>&1; then
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echo "Installing git-filter-repo via pacman..."
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sudo pacman -S --needed --noconfirm git-filter-repo
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else
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echo "ERROR: git-filter-repo not found. Install it and re-run."
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echo " https://github.com/newren/git-filter-repo"
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exit 1
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fi
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fi
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cleanup() { :; }
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WORKDIR=""
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# If I pass -c/--auto-clone, I work in a mirror clone (safe for rewriting everything)
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if "$AUTO_CLONE"; then
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if [[ -n "$CLONE_DIR" ]]; then
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WORKDIR="$CLONE_DIR"
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mkdir -p "$WORKDIR"
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echo "Cloning (mirror) into: $WORKDIR"
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else
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WORKDIR="$(mktemp -d -t gitupd.XXXXXX)"
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echo "Cloning (mirror) into temp dir: $WORKDIR"
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cleanup() { rm -rf "$WORKDIR"; }
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trap cleanup EXIT
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fi
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git clone --mirror "$URL" "$WORKDIR"
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cd "$WORKDIR"
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else
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# Otherwise I expect to be inside an existing Git worktree
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if ! git rev-parse --is-inside-work-tree >/dev/null 2>&1; then
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echo "ERROR: Not inside a Git repository. Use --auto-clone or cd into a repo."
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exit 1
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fi
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fi
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# Helper: turn "a,b,c" into a Python bytes set: {b"a",b"b",b"c"}
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to_py_set() {
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local csv="${1:-}"
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if [[ -z "$csv" ]]; then
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printf 'set()'
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else
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awk -v RS=',' '
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{ gsub(/^[ \t\r\n]+|[ \t\r\n]+$/,"",$0); if (length($0)) printf "b\"%s\",", $0 }
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' <<<"$csv" | sed 's/,$//' | awk '{ printf "{%s}", $0 }'
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fi
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}
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EMAIL_SET=$(to_py_set "$OLD_EMAILS")
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NAME_SET=$(to_py_set "$OLD_NAMES")
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EMAIL_CB=()
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NAME_CB=()
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if [[ "$EMAIL_SET" != "set()" ]]; then
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EMAIL_CB=( --email-callback "return b\"${NEW_EMAIL}\" if email in ${EMAIL_SET} else email" )
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echo "Rewriting these emails -> ${NEW_EMAIL}: $OLD_EMAILS"
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fi
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if [[ "$NAME_SET" != "set()" ]]; then
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NAME_CB=( --name-callback "return b\"${NEW_NAME}\" if name in ${NAME_SET} else name" )
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echo "Rewriting these names -> ${NEW_NAME}: $OLD_NAMES"
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fi
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if [[ ${#EMAIL_CB[@]} -eq 0 && ${#NAME_CB[@]} -eq 0 ]]; then
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echo "Nothing to rewrite (no --email/--name provided). Exiting."
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exit 0
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fi
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# I fetch before rewriting so leases/refs are current
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git fetch --all --tags --prune
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# I always drop a safety tag I can roll back to
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TAG="pre-rewrite-$(date +%Y%m%d-%H%M%S)"
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git tag "$TAG" || true
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echo "Created safety tag: $TAG"
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echo "Running git-filter-repo..."
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git filter-repo --force "${EMAIL_CB[@]}" "${NAME_CB[@]}"
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# git-filter-repo may remove 'origin'; I make sure it points to the requested URL
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if git remote get-url origin >/dev/null 2>&1; then
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git remote set-url origin "$URL"
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else
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git remote add origin "$URL"
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fi
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# I push only branches and tags (no PR/internal refs), with force + prune
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echo "Pushing branches and tags (force + prune)..."
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git push --force --prune origin 'refs/heads/*:refs/heads/*'
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git push --force --prune origin 'refs/tags/*:refs/tags/*'
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echo "Done. Current unique identities:"
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git log --all --pretty='%an <%ae>' | sort -u
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echo
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echo "Notes:"
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echo "- If the push is rejected, temporarily allow force-push on protected branches on the server, then re-protect."
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echo "- For HTTPS, most servers require a Personal Access Token as the password."
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