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yadm/yadm

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#!/bin/sh
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# yadm - Yet Another Dotfiles Manager
# Copyright (C) 2015 Tim Byrne
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, version 3 of the License.
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#; execute script with bash (shebang line is /bin/sh for portability)
if [ -z "$BASH_VERSION" ]; then
[ "$YADM_TEST" != 1 ] && exec bash "$0" "$@"
fi
VERSION=1.06
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YADM_WORK="$HOME"
YADM_DIR="$HOME/.yadm"
YADM_REPO="repo.git"
YADM_CONFIG="config"
YADM_ENCRYPT="encrypt"
YADM_ARCHIVE="files.gpg"
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YADM_BOOTSTRAP="bootstrap"
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GPG_PROGRAM="gpg"
GIT_PROGRAM="git"
LS_PROGRAM="/bin/ls"
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#; flag causing path translations with cygpath
USE_CYGPATH=0
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#; flag when something may have changes (which prompts auto actions to be performed)
CHANGES_POSSIBLE=0
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#; flag when a bootstrap should be performed after cloning
#; 0: skip auto_bootstrap, 1: ask, 2: perform bootstrap, 3: prevent bootstrap
DO_BOOTSTRAP=0
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function main() {
require_git
#; create the YADM_DIR if it doesn't exist yet
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[ -d "$YADM_DIR" ] || mkdir -p "$YADM_DIR"
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#; parse command line arguments
local retval=0
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internal_commands="^(alt|bootstrap|clean|clone|config|decrypt|encrypt|help|init|list|perms|version)$"
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if [ -z "$*" ] ; then
#; no argumnts will result in help()
help
elif [[ "$1" =~ $internal_commands ]] ; then
#; for internal commands, process all of the arguments
YADM_COMMAND="$1"
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YADM_ARGS=()
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shift
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while [[ $# -gt 0 ]] ; do
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key="$1"
case $key in
-a) #; used by list()
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LIST_ALL="YES"
;;
-d) #; used by all commands
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DEBUG="YES"
;;
-f) #; used by init() and clone()
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FORCE="YES"
;;
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-l) #; used by decrypt()
DO_LIST="YES"
;;
-w) #; used by init() and clone()
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if [[ ! "$2" =~ ^/ ]] ; then
error_out "You must specify a fully qualified work tree"
fi
YADM_WORK="$2"
shift
;;
*) #; any unhandled arguments
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YADM_ARGS+=("$1")
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;;
esac
shift
done
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[ ! -d "$YADM_WORK" ] && error_out "Work tree does not exist: [$YADM_WORK]"
$YADM_COMMAND "${YADM_ARGS[@]}"
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else
#; any other commands are simply passed through to git
git_command "$@"
retval="$?"
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fi
#; process automatic events
auto_alt
auto_perms
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auto_bootstrap
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exit $retval
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}
#; ****** yadm Commands ******
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function alt() {
require_repo
match_class="$(config alt.class)"
if [ -z "$match_class" ] ; then
match_class="()"
fi
match_class="(%|$match_class)"
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match_system="$(config alt.os)"
if [ -z "$match_system" ] ; then
match_system=$(uname -s)
fi
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match_system="(%|$match_system)"
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match_host="$(config alt.host)"
if [ -z "$match_host" ] ; then
match_host=$(hostname)
match_host=${match_host%%.*} #; trim any domain from hostname
fi
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match_host="(%|$match_host)"
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match_user="$(config alt.user)"
if [ -z "$match_user" ] ; then
match_user=$(id -u -n)
fi
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match_user="(%|$match_user)"
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#; regex for matching "<file>##CLASS.SYSTEM.HOSTNAME.USER"
match="^(.+)##(()|$match_class|$match_system|$match_class\.$match_system|$match_system\.$match_host|$match_class\.$match_system\.$match_host|$match_system\.$match_host\.$match_user|$match_class\.$match_system\.$match_host\.$match_user)$"
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#; process relative to YADM_WORK
YADM_WORK=$(unix_path "$("$GIT_PROGRAM" config core.worktree)")
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cd "$YADM_WORK" || {
debug "Alternates not processed, unable to cd to $YADM_WORK"
return
}
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#; only be noisy if the "alt" command was run directly
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[ "$YADM_COMMAND" = "alt" ] && loud="YES"
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#; loop over all "tracked" files
#; for every file which matches the above regex, create a symlink
last_linked=''
local IFS=$'\n'
for tracked_file in $("$GIT_PROGRAM" ls-files | sort) $(cat "$YADM_ENCRYPT" 2>/dev/null); do
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tracked_file="$YADM_WORK/$tracked_file"
#; process both the path, and it's parent directory
for alt_path in "$tracked_file" "${tracked_file%/*}"; do
if [ -e "$alt_path" ] ; then
if [[ $alt_path =~ $match ]] ; then
if [ "$alt_path" != "$last_linked" ] ; then
new_link="${BASH_REMATCH[1]}"
debug "Linking $alt_path to $new_link"
[ -n "$loud" ] && echo "Linking $alt_path to $new_link"
ln -nfs "$alt_path" "$new_link"
last_linked="$alt_path"
fi
fi
fi
done
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done
}
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function bootstrap() {
bootstrap_available || error_out "Cannot execute bootstrap\n'$YADM_BOOTSTRAP' is not an executable program."
echo "Executing $YADM_BOOTSTRAP"
exec "$YADM_BOOTSTRAP"
}
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function clean() {
error_out "\"git clean\" has been disabled for safety. You could end up removing all unmanaged files."
}
function clone() {
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DO_BOOTSTRAP=1
clone_args=()
while [[ $# -gt 0 ]] ; do
key="$1"
case $key in
--bootstrap) #; force bootstrap, without prompt
DO_BOOTSTRAP=2
;;
--no-bootstrap) #; prevent bootstrap, without prompt
DO_BOOTSTRAP=3
;;
*) #; main arguments are kept intact
clone_args+=("$1")
;;
esac
shift
done
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#; clone will begin with a bare repo
local empty=
init $empty
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#; add the specified remote, and configure the repo to track origin/master
debug "Adding remote to new repo"
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"$GIT_PROGRAM" remote add origin "${clone_args[@]}"
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debug "Configuring new repo to track origin/master"
"$GIT_PROGRAM" config branch.master.remote origin
"$GIT_PROGRAM" config branch.master.merge refs/heads/master
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#; fetch / merge (and possibly fallback to reset)
debug "Doing an initial fetch of the origin"
"$GIT_PROGRAM" fetch origin || {
debug "Removing repo after failed clone"
rm -rf "$YADM_REPO"
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error_out "Unable to fetch origin ${clone_args[0]}"
}
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debug "Doing an initial merge of origin/master"
"$GIT_PROGRAM" merge origin/master || {
debug "Merge failed, doing a reset and stashing conflicts."
"$GIT_PROGRAM" reset origin/master
if cd "$YADM_WORK"; then # necessary because of a bug in Git
"$GIT_PROGRAM" -c user.name='yadm clone' -c user.email='yadm' stash save Conflicts preserved from yadm clone command 2>&1
cat <<EOF
**NOTE**
Merging origin/master failed.
As a result, yadm did 'reset origin/master', and then
stashed the conflicting data.
This likely happened because you had files in \$HOME
which conflicted with files tracked by origin/master.
You can review the stashed conflicts with the command
'yadm stash show -p'. If you want to restore the stashed
data, you can run 'yadm stash apply' or 'yadm stash pop'
and then handle the conflicts in another way.
EOF
else
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#; skip auto_bootstrap if conflicts could not be stashed
DO_BOOTSTRAP=0
cat <<EOF
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**NOTE**
Merging origin/master failed.
yadm did 'reset origin/master' instead.
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yadm did not stash these conflicts beacuse it was unable
to change to the $YADM_WORK directory.
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Please review and resolve any differences appropriately
If you know what you're doing, and want to overwrite the
tracked files, consider 'yadm reset --hard origin/master'
EOF
fi
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}
CHANGES_POSSIBLE=1
}
function config() {
if [ -z "$*" ] ; then
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#; with no parameters, provide some helpful documentation
echo TODO: Print help about available yadm configurations
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else
#; operate on the yadm configuration file
git config --file="$(mixed_path "$YADM_CONFIG")" "$@"
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CHANGES_POSSIBLE=1
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fi
}
function decrypt() {
require_gpg
require_archive
YADM_WORK=$(unix_path "$("$GIT_PROGRAM" config core.worktree)")
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if [ "$DO_LIST" = "YES" ] ; then
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tar_option="t"
else
tar_option="x"
fi
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#; decrypt the archive
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if ($GPG_PROGRAM -d "$YADM_ARCHIVE" || echo 1) | tar v${tar_option}f - -C "$YADM_WORK"; then
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[ ! "$DO_LIST" = "YES" ] && echo "All files decrypted."
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else
error_out "Unable to extract encrypted files."
fi
CHANGES_POSSIBLE=1
}
function encrypt() {
require_gpg
require_encrypt
require_ls
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#; process relative to YADM_WORK
YADM_WORK=$(unix_path "$("$GIT_PROGRAM" config core.worktree)")
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cd "$YADM_WORK" || {
debug "Encryption not processed, unable to cd to $YADM_WORK"
return
}
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#; Build gpg options for gpg
GPG_KEY="$(config yadm.gpg-recipient)"
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if [ "$GPG_KEY" = "ASK" ]; then
GPG_OPTS=("--no-default-recipient" "-e")
elif [ "$GPG_KEY" != "" ]; then
GPG_OPTS=("-e" "-r $GPG_KEY")
else
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GPG_OPTS=("-c")
fi
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#; build a list of globs from YADM_ENCRYPT
GLOBS=()
while IFS='' read -r glob || [ -n "$glob" ]; do
if [[ ! $glob =~ ^# && ! $glob =~ ^[[:space:]]*$ ]] ; then
GLOBS=("${GLOBS[@]}" $(eval "$LS_PROGRAM" "$glob" 2>/dev/null))
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fi
done < "$YADM_ENCRYPT"
#; report which files will be encrypted
echo "Encrypting the following files:"
"$LS_PROGRAM" -1 "${GLOBS[@]}"
echo
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#; encrypt all files which match the globs
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if tar -f - -c "${GLOBS[@]}" | $GPG_PROGRAM --yes "${GPG_OPTS[@]}" --output "$YADM_ARCHIVE"; then
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echo "Wrote new file: $YADM_ARCHIVE"
else
error_out "Unable to write $YADM_ARCHIVE"
fi
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#; offer to add YADM_ARCHIVE if untracked
archive_status=$("$GIT_PROGRAM" status --porcelain -uall "$(mixed_path "$YADM_ARCHIVE")" 2>/dev/null)
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archive_regex="^\?\?"
if [[ $archive_status =~ $archive_regex ]] ; then
echo "It appears that $YADM_ARCHIVE is not tracked by yadm's repository."
echo "Would you like to add it now? (y/n)"
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read -r answer
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if [[ $answer =~ ^[yY]$ ]] ; then
"$GIT_PROGRAM" add "$(mixed_path "$YADM_ARCHIVE")"
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fi
fi
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CHANGES_POSSIBLE=1
}
function git_command() {
require_repo
#; translate 'gitconfig' to 'config' -- 'config' is reserved for yadm
if [ "$1" = "gitconfig" ] ; then
set -- "config" "${@:2}"
fi
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CHANGES_POSSIBLE=1
#; pass commands through to git
"$GIT_PROGRAM" "$@"
return "$?"
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}
function help() {
cat << EOF
Usage: yadm <command> [options...]
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Manage dotfiles maintained in a Git repository. Manage alternate files
for specific systems or hosts. Encrypt/decrypt private files.
Git Commands:
Any Git command or alias can be used as a <command>. It will operate
on yadm's repository and files in the work tree (usually \$HOME).
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Commands:
yadm init [-f] - Initialize an empty repository
yadm clone <url> [-f] - Clone an existing repository
yadm config <name> <value> - Configure a setting
yadm list [-a] - List tracked files
yadm alt - Create links for alternates
yadm encrypt - Encrypt files
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yadm decrypt [-l] - Decrypt files
yadm perms - Fix perms for private files
Files:
\$HOME/.yadm/config - yadm's configuration file
\$HOME/.yadm/repo.git - yadm's Git repository
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\$HOME/.yadm/encrypt - List of globs used for encrypt/decrypt
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\$HOME/.yadm/files.gpg - Encrypted data stored here
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Use "man yadm" for complete documentation.
EOF
exit 1
}
function init() {
#; safety check, don't attempt to init when the repo is already present
[ -d "$YADM_REPO" ] && [ -z "$FORCE" ] && \
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error_out "Git repo already exists. [$YADM_REPO]\nUse '-f' if you want to force it to be overwritten."
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#; remove existing if forcing the init to happen anyway
[ -d "$YADM_REPO" ] && {
debug "Removing existing repo prior to init"
rm -rf "$YADM_REPO"
}
#; init a new bare repo
debug "Init new repo"
"$GIT_PROGRAM" init --shared=0600 --bare "$(mixed_path "$YADM_REPO")" "$@"
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configure_repo
CHANGES_POSSIBLE=1
}
function list() {
require_repo
#; process relative to YADM_WORK when --all is specified
if [ -n "$LIST_ALL" ] ; then
YADM_WORK=$(unix_path "$("$GIT_PROGRAM" config core.worktree)")
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cd "$YADM_WORK" || {
debug "List not processed, unable to cd to $YADM_WORK"
return
}
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fi
#; list tracked files
"$GIT_PROGRAM" ls-files
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}
function perms() {
require_ls
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#; TODO: prevent repeats in the files changed
#; process relative to YADM_WORK
YADM_WORK=$(unix_path "$("$GIT_PROGRAM" config core.worktree)")
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cd "$YADM_WORK" || {
debug "Perms not processed, unable to cd to $YADM_WORK"
return
}
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GLOBS=()
#; include the archive created by "encrypt"
[ -f "$YADM_ARCHIVE" ] && GLOBS=("${GLOBS[@]}" "$YADM_ARCHIVE")
#; include all .ssh files (unless disabled)
if [[ $(config --bool yadm.ssh-perms) != "false" ]] ; then
GLOBS=("${GLOBS[@]}" ".ssh" ".ssh/*")
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fi
#; include all gpg files (unless disabled)
if [[ $(config --bool yadm.gpg-perms) != "false" ]] ; then
GLOBS=("${GLOBS[@]}" ".gnupg" ".gnupg/*")
fi
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#; include globs found in YADM_ENCRYPT (if present)
if [ -f "$YADM_ENCRYPT" ] ; then
while IFS='' read -r glob || [ -n "$glob" ]; do
if [[ ! $glob =~ ^# ]] ; then
GLOBS=("${GLOBS[@]}" $(eval "$LS_PROGRAM" "$glob" 2>/dev/null))
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fi
done < "$YADM_ENCRYPT"
fi
#; remove group/other permissions from collected globs
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#shellcheck disable=SC2068
#(SC2068 is disabled because in this case, we desire globbing)
chmod -f go-rwx ${GLOBS[@]} >/dev/null 2>&1
#; TODO: detect and report changing permissions in a portable way
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}
function version() {
echo "yadm $VERSION"
exit 0
}
#; ****** Utility Functions ******
function process_global_args() {
#; global arguments are removed before the main processing is done
MAIN_ARGS=()
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while [[ $# -gt 0 ]] ; do
key="$1"
case $key in
-Y|--yadm-dir) #; override the standard YADM_DIR
if [[ ! "$2" =~ ^/ ]] ; then
error_out "You must specify a fully qualified yadm directory"
fi
YADM_DIR="$2"
shift
;;
--yadm-repo) #; override the standard YADM_REPO
if [[ ! "$2" =~ ^/ ]] ; then
error_out "You must specify a fully qualified repo path"
fi
YADM_OVERRIDE_REPO="$2"
shift
;;
--yadm-config) #; override the standard YADM_CONFIG
if [[ ! "$2" =~ ^/ ]] ; then
error_out "You must specify a fully qualified config path"
fi
YADM_OVERRIDE_CONFIG="$2"
shift
;;
--yadm-encrypt) #; override the standard YADM_ENCRYPT
if [[ ! "$2" =~ ^/ ]] ; then
error_out "You must specify a fully qualified encrypt path"
fi
YADM_OVERRIDE_ENCRYPT="$2"
shift
;;
--yadm-archive) #; override the standard YADM_ARCHIVE
if [[ ! "$2" =~ ^/ ]] ; then
error_out "You must specify a fully qualified archive path"
fi
YADM_OVERRIDE_ARCHIVE="$2"
shift
;;
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--yadm-bootstrap) #; override the standard YADM_BOOTSTRAP
if [[ ! "$2" =~ ^/ ]] ; then
error_out "You must specify a fully qualified bootstrap path"
fi
YADM_OVERRIDE_BOOTSTRAP="$2"
shift
;;
*) #; main arguments are kept intact
MAIN_ARGS+=("$1")
;;
esac
shift
done
}
function configure_paths() {
#; change all paths to be relative to YADM_DIR
YADM_REPO="$YADM_DIR/$YADM_REPO"
YADM_CONFIG="$YADM_DIR/$YADM_CONFIG"
YADM_ENCRYPT="$YADM_DIR/$YADM_ENCRYPT"
YADM_ARCHIVE="$YADM_DIR/$YADM_ARCHIVE"
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YADM_BOOTSTRAP="$YADM_DIR/$YADM_BOOTSTRAP"
#; independent overrides for paths
if [ -n "$YADM_OVERRIDE_REPO" ]; then
YADM_REPO="$YADM_OVERRIDE_REPO"
fi
if [ -n "$YADM_OVERRIDE_CONFIG" ]; then
YADM_CONFIG="$YADM_OVERRIDE_CONFIG"
fi
if [ -n "$YADM_OVERRIDE_ENCRYPT" ]; then
YADM_ENCRYPT="$YADM_OVERRIDE_ENCRYPT"
fi
if [ -n "$YADM_OVERRIDE_ARCHIVE" ]; then
YADM_ARCHIVE="$YADM_OVERRIDE_ARCHIVE"
fi
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if [ -n "$YADM_OVERRIDE_BOOTSTRAP" ]; then
YADM_BOOTSTRAP="$YADM_OVERRIDE_BOOTSTRAP"
fi
#; use the yadm repo for all git operations
GIT_DIR=$(mixed_path "$YADM_REPO")
export GIT_DIR
}
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function configure_repo() {
debug "Configuring new repo"
#; change bare to false (there is a working directory)
"$GIT_PROGRAM" config core.bare 'false'
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#; set the worktree for the yadm repo
"$GIT_PROGRAM" config core.worktree "$(mixed_path "$YADM_WORK")"
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#; by default, do not show untracked files and directories
"$GIT_PROGRAM" config status.showUntrackedFiles no
#; possibly used later to ensure we're working on the yadm repo
"$GIT_PROGRAM" config yadm.managed 'true'
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}
function debug() {
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[ -n "$DEBUG" ] && echo -e "DEBUG: $*"
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}
function error_out() {
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echo -e "ERROR: $*"
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exit 1
}
#; ****** Auto Functions ******
function auto_alt() {
#; process alternates if there are possible changes
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if [ "$CHANGES_POSSIBLE" = "1" ] ; then
auto_alt=$(config --bool yadm.auto-alt)
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if [ "$auto_alt" != "false" ] ; then
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[ -d "$YADM_REPO" ] && alt
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fi
fi
}
function auto_perms() {
#; process permissions if there are possible changes
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if [ "$CHANGES_POSSIBLE" = "1" ] ; then
auto_perms=$(config --bool yadm.auto-perms)
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if [ "$auto_perms" != "false" ] ; then
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[ -d "$YADM_REPO" ] && perms
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fi
fi
}
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function auto_bootstrap() {
bootstrap_available || return
[ "$DO_BOOTSTRAP" -eq 0 ] && return
[ "$DO_BOOTSTRAP" -eq 3 ] && return
[ "$DO_BOOTSTRAP" -eq 2 ] && bootstrap
if [ "$DO_BOOTSTRAP" -eq 1 ] ; then
echo "Found $YADM_BOOTSTRAP"
echo "It appears that a bootstrap program exists."
echo "Would you like to execute it now? (y/n)"
read -r answer
if [[ $answer =~ ^[yY]$ ]] ; then
bootstrap
fi
fi
}
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#; ****** Prerequisites Functions ******
function require_archive() {
[ -f "$YADM_ARCHIVE" ] || error_out "$YADM_ARCHIVE does not exist. did you forget to create it?"
}
function require_encrypt() {
[ -f "$YADM_ENCRYPT" ] || error_out "$YADM_ENCRYPT does not exist. did you forget to create it?"
}
function require_git() {
local alt_git
alt_git="$(config yadm.git-program)"
local more_info
more_info=""
if [ "$alt_git" != "" ] ; then
GIT_PROGRAM="$alt_git"
more_info="\nThis command has been set via the yadm.git-program configuration."
fi
command -v "$GIT_PROGRAM" >/dev/null 2>&1 || \
error_out "This functionality requires Git to be installed, but the command '$GIT_PROGRAM' cannot be located.$more_info"
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}
function require_gpg() {
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local alt_gpg
alt_gpg="$(config yadm.gpg-program)"
local more_info
more_info=""
if [ "$alt_gpg" != "" ] ; then
GPG_PROGRAM="$alt_gpg"
more_info="\nThis command has been set via the yadm.gpg-program configuration."
fi
command -v "$GPG_PROGRAM" >/dev/null 2>&1 || \
error_out "This functionality requires GPG to be installed, but the command '$GPG_PROGRAM' cannot be located.$more_info"
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}
function require_repo() {
[ -d "$YADM_REPO" ] || error_out "Git repo does not exist. did you forget to run 'init' or 'clone'?"
}
function require_ls() {
if [ ! -f "$LS_PROGRAM" ] ; then
command -v ls >/dev/null 2>&1 || \
error_out "This functionality requires 'ls' to be installed at '$LS_PROGRAM' or listed in your \$PATH"
LS_PROGRAM=ls
fi
}
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function bootstrap_available() {
[ -f "$YADM_BOOTSTRAP" ] && [ -x "$YADM_BOOTSTRAP" ] && return
return 1
}
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#; ****** Directory tranlations ******
function test_cygwin() {
case "$(uname -s)" in
CYGWIN*)
git_version=$(git --version 2>/dev/null)
if [[ "$git_version" =~ windows ]] ; then
USE_CYGPATH=1
fi
;;
*)
;;
esac
}
function unix_path() {
#; for paths used by bash/yadm
if [ "$USE_CYGPATH" = "1" ] ; then
cygpath -u "$1"
else
echo "$1"
fi
}
function mixed_path() {
#; for paths used by Git
if [ "$USE_CYGPATH" = "1" ] ; then
cygpath -m "$1"
else
echo "$1"
fi
}
#; ****** Main processing (when not unit testing) ******
if [ "$YADM_TEST" != 1 ] ; then
process_global_args "$@"
test_cygwin
configure_paths
main "${MAIN_ARGS[@]}"
fi