feat: Allow pushing to different repositories

Dockerfile.ssh

@@ -0,0 +1,6 @@
+FROM alpine:3.19
+COPY --chmod=555 entrypoint-ssh.sh /bin/entrypoint.sh
+COPY --chmod=600 ssh_config /root/.ssh/config
+RUN apk add --no-cache git openssh zsh
+
+ENTRYPOINT ["zsh", "/bin/entrypoint.sh"]

README.md

@@ -0,0 +1,35 @@
+# woodpecker-ssg-deploy
+
+A Woodpecker plugin to push outputs created by SSGs into git repositories.
+
+## Usage
+
+```yaml
+  deploy:
+    image: git.polynom.me/papatutuwawa/woodpecker-ssg-deploy:latest
+    # The push token
+    # NOTE: For gitea, this is currently an access token with Read/Write access
+    #       to repositories.
+    secrets: [ token ]
+    settings:
+      # The EMail to use for the git user that does the pushing
+      email: "system@example.org"
+      # The name to use for the git user that does the pushing
+      name: "example.org CI System"
+      # The name of the environment variable that contains the push token
+      token_env: "TOKEN"
+      # The name of the directory containing the SSG output
+      output: "public"
+      # The name of the branch to push into. Defaults to "pages"
+      branch: "pages"
+```
+
+What the plugin does is initialize a new Git repository in the output directory,
+add all files in the output directory to the repository and then force push to the original 
+repository on the specified branch.
+
+For a real-life example [see here](https://git.polynom.me/PapaTutuWawa/blog.polynom.me).
+
+## License
+
+See `LICENSE`.

entrypoint-ssh.sh

@@ -0,0 +1,48 @@
+#!/bin/zsh
+set -e
+
+branch=${PLUGIN_BRANCH:-"pages"}
+token_env=${PLUGIN_TOKEN_ENV}
+output=${PLUGIN_OUTPUT}
+name=${PLUGIN_NAME}
+email=${PLUGIN_EMAIL}
+
+# Allow passing a different push SSH URL
+clone_url=$CI_REPO_CLONE_SSH_URL
+if [[ -n "$PLUGIN_SSH_URL" ]]; then
+    clone_url=${PLUGIN_SSH_URL}
+fi
+
+if [[ -z "$token_env" || -z "$branch" || -z "$name" || -z "$email" || -z "$clone_url" ]]; then
+    echo "Invalid configuration: Token environment variable name, branch name empty, name, clone URL, or email"
+    echo "Token env: $token_env"
+    echo "branch:    $branch"
+    echo "Name:      $name"
+    echo "Email:     $email"
+    echo "Clone URL: $clone_url"
+    exit 1
+fi
+
+# Setup the SSH directory
+mkdir -p ~/.ssh
+chown root:root ~/.ssh
+chmod 700 ~/.ssh
+
+# Setup the SSH key
+print -rl -- ${(P)token_env} > ~/.ssh/id_rsa
+chown root:root ~/.ssh/id_rsa
+chmod 600 ~/.ssh/id_rsa
+
+# Setup git
+git config --global user.email "$email"
+git config --global user.name "$name"
+git config --global --add safe.directory "$CI_WORKSPACE/$CI_REPO_OWNER/$CI_REPO_NAME/$output"
+
+# Init a new repository in the output directory and add all files
+git init -b "$branch" "$output"
+cd "$output"
+git add --all
+git commit -m "Deploy new version $CI_COMMIT_SHA"
+
+# Push the repository
+git push -u "$clone_url" -f "$branch"

entrypoint.sh

@@ -2,8 +2,10 @@
 branch=${PLUGIN_BRANCH:-"pages"}
 token_env=${PLUGIN_TOKEN_ENV}
 output=${PLUGIN_OUTPUT}
-if [[ -z "$token_env" ]] || [[ -z "$branch" ]]; then
-    echo "Invalid configuration: Token environment variable name or branch name empty"
+name=${PLUGIN_NAME}
+email=${PLUGIN_EMAIL}
+if [[ -z "$token_env" ]] || [[ -z "$branch" ]] || [[ -z "$name"]] || [[ -z "$email" ]]; then
+    echo "Invalid configuration: Token environment variable name, branch name empty, name, or email"
     exit 1
 fi
 
@@ -13,8 +15,8 @@ if [[ "$?" -ne "0" ]]; then
     exit 1
 fi
 
-[[ -n "$PLUGIN_EMAIL" ]] && git config --config user.email "$PLUGIN_EMAIL"
-[[ -n "$PLUGIN_NAME" ]] && git config --config user.name "$PLUGIN_NAME"
+git config --global user.email "$email"
+git config --global user.name "$name"
 git config --global --add safe.directory "$CI_WORKSPACE/$CI_REPO_OWNER/$CI_REPO_NAME/$output"
 
 # Init a new repository in the output directory and add all files

ssh_config

@@ -0,0 +1,3 @@
+Host *
+   StrictHostKeyChecking no
+   UserKnownHostsFile=/dev/null