chezmoi

name	chezmoi
description	Manage dotfiles with chezmoi. Use when working with dotfiles, chezmoi templates, machine-specific configuration, syncing configs across machines, or when the user mentions chezmoi, dotfiles, or configuration management.
allowed-tools	["Read","Edit","Write","Glob","Grep","Bash(chezmoi *)"]

Chezmoi Dotfiles Management

Action Guidance

When the user asks about dotfiles or chezmoi operations, implement the changes directly using chezmoi commands rather than only suggesting them. If the user says "make this work on macOS only" or "add my bashrc to chezmoi", proceed with implementation.

Always preview significant changes with chezmoi diff or chezmoi cat <file> before applying.

Commands

chezmoi add <file>           # Add file to chezmoi
chezmoi apply --refresh-externals --force  # Apply changes (always use these flags)
chezmoi diff                 # Preview what would change
chezmoi cat <file>           # Preview rendered template output
chezmoi data                 # Show available template variables
chezmoi edit <file>          # Edit source file
chezmoi edit ~/.local/share/chezmoi/.chezmoiremove  # Edit removal list

File Naming

Prefix/Suffix	Effect
dot_	Installed as . (dot_gitconfig → ~/.gitconfig)
private_	Restrictive permissions (600)
executable_	Executable permissions (755)
.tmpl	Processed as Go template
symlink_	Creates symlink

Machine-Specific Templates

Convert a static file to a template by renaming with .tmpl suffix, then use conditionals:

By OS

{{- if eq .chezmoi.os "darwin" }}
# macOS config
{{- end }}

{{- if eq .chezmoi.os "linux" }}
# Linux config
{{- end }}

By hostname

{{- if hasPrefix .chezmoi.hostname "work-" }}
# work machine config
{{- end }}

By environment variable

{{- if env "WORK_ENV" }}
# when WORK_ENV is set
{{- end }}

Combined conditions

{{- if or (eq .chezmoi.os "darwin") (env "WORK_ENV") }}
# macOS or when WORK_ENV is set
{{- end }}

Escaping Nested Templates

When the target file itself uses {{ }} syntax (like mise, Jinja2, or Tera templates), escape the braces so chezmoi doesn't process them as Go template syntax:

SOME_VAR = "{{ "{{" }}env.OTHER_VAR{{ "}}" }}"

This renders as SOME_VAR = "{{env.OTHER_VAR}}" in the output. The {{ "{{" }} and {{ "}}" }} are Go template expressions that output literal brace characters.

Removing Files

Use .chezmoiremove to clean up dotfiles that chezmoi should remove from your system:

# Create .chezmoiremove file listing targets to remove
cat > ~/.local/share/chezmoi/.chezmoiremove << 'EOF'
~/.old-config
~/.deprecated-rc
EOF

# Preview what would be removed
chezmoi diff

# Apply to remove the files
chezmoi apply --refresh-externals --force

Template-based removal (.chezmoiremove.tmpl)

Conditionally remove files based on system variables:

{{- if eq .chezmoi.os "darwin" }}
~/.linux-only-config
{{- end }}

{{- if not (env "WORK_ENV") }}
~/.work-config
{{- end }}

The file is always processed as a template, even without the .tmpl extension.

External Dependencies

Manage external git repos in .chezmoiexternal.toml:

[".zsh/plugins/some-plugin"]
    type = "git-repo"
    url = "https://github.com/user/some-plugin.git"
    refreshPeriod = "168h"

Workflow: Converting Static File to Template

When converting a static config to machine-specific template:

1. Read the current file to understand its contents
2. Identify machine-specific values (paths, hostnames, environment-specific settings)
3. Run chezmoi add --template <file> to add as template
4. Edit the template source to add conditionals (see "Machine-Specific Templates")
5. Preview with chezmoi cat <file> to verify rendering on this machine
6. Apply with chezmoi apply --refresh-externals --force

Gotchas

1. Removing managed files: Use .chezmoiremove to clean up files (see "Removing Files" section)
2. Always preview: Run chezmoi cat <file> before applying templates
3. Always use --refresh-externals --force flags: Critical because --refresh-externals ensures external git repos and archives update, and --force prevents interactive TTY prompts that would block execution (Claude cannot respond to interactive prompts)
4. Template errors: Use chezmoi execute-template '{{ .chezmoi.os }}' to test template snippets

Troubleshooting

Template syntax errors: Test small snippets with chezmoi execute-template '{{ .chezmoi.os }}'

File not applying: Check chezmoi status and chezmoi diff to see what changes are pending

External not refreshing: The refresh period might not have elapsed; use --refresh-externals flag to force refresh

Permission errors: Verify file has correct prefix (private_ for 600, executable_ for 755)