vcsh

   1 #!/bin/sh
   2
   3 [ -n "$VCSH_DEBUG" ]      && set -x
   4 [ -z "$XDG_CONFIG_HOME" ] && XDG_CONFIG_HOME="$HOME/.config"
   5 [ -z "$VCSH_BASE" ]       && VCSH_BASE="$XDG_CONFIG_HOME/vcsh/repo.d"
   6
   7 SELF=$(basename $0)
   8
   9 help() {
  10         echo "usage: $SELF <args>
  11
  12    clone <remote> \\
  13          [<repo>]       Clone from an existing repository
  14    help                 Display this help text
  15    delete               Delete an existing repository
  16    enter                Enter repository; spawn new $SHELL
  17    init <repo>          Initialize a new repository
  18    list                 List all repositories
  19    run <repo> \\
  20        <command>        Use this repository
  21
  22    seed-gitignore \\
  23    <repo>               Seed .gitignore.d/<repo> from git ls-files
  24    setup                Set up repository with recommended settings
  25
  26    <repo> <git command> Special command that allows you to run git commands
  27                         directly without having to type so much ;)" >&2
  28 }
  29
  30 debug() {
  31         [ -n "$VCSH_DEBUG" ] && echo "$SELF: debug: $@"
  32 }
  33
  34 verbose() {
  35         if [ -n "$VCSH_DEBUG" ] || [ -n "$VCSH_VERBOSE" ]; then echo "$SELF: verbose: $@"; fi
  36 }
  37
  38 error () {
  39         echo "$SELF: error: $1" >&2
  40 }
  41
  42 fatal () {
  43         echo "$SELF: fatal error: $1" >&2
  44         exit $2
  45 }
  46
  47 info () {
  48         echo "$SELF: info: $1"
  49 }
  50
  51 setup() {
  52         git config core.worktree     "$GIT_WORK_TREE"
  53         git config core.excludesfile ".gitignore.d/$VCSH_REPO_NAME"
  54         git config vcsh.vcsh         'true'
  55         touch   "$HOME/.gitignore.d/$VCSH_REPO_NAME"
  56         git add "$HOME/.gitignore.d/$VCSH_REPO_NAME"
  57 }
  58
  59 init() {
  60         verbose "init() begin"
  61         [ ! -e "$GIT_DIR" ] || fatal "$GIT_DIR exists" 10
  62         export GIT_WORK_TREE="$HOME"
  63         mkdir -p "$GIT_WORK_TREE"
  64         cd "$GIT_WORK_TREE" || fatal "could not enter $GIT_WORK_TREE" 11
  65         cd "$GIT_WORK_TREE"
  66         git init
  67         setup
  68         verbose "init() end"
  69 }
  70
  71 use() {
  72         verbose "use() begin"
  73         if [ ! -d "$GIT_DIR" ]; then
  74                 error "no repository found for '$VCSH_REPO_NAME'"
  75                 return 12
  76         fi
  77         export GIT_DIR
  78         export GIT_WORK_TREE="$(git config --get core.worktree)"
  79         export VCSH_DIRECTORY="$VCSH_REPO_NAME"
  80         verbose "use() end"
  81 }
  82
  83
  84 if [ "$1" = 'clone' ]; then
  85         export VCSH_COMMAND="$1"
  86         GIT_REMOTE="$2"
  87         export GIT_REMOTE
  88         VCSH_REPO_NAME="$3"
  89         [ -z "$VCSH_REPO_NAME" ] && VCSH_REPO_NAME=$(basename "$GIT_REMOTE" .git)
  90         export VCSH_REPO_NAME
  91         export GIT_DIR="$VCSH_BASE/$VCSH_REPO_NAME.git"
  92 elif [ "$1" = 'delete' ] ||
  93      [ "$1" = 'enter' ] ||
  94      [ "$1" = 'init' ] ||
  95      [ "$1" = 'run' ] ||
  96      [ "$1" = 'seed-gitignore' ] ||
  97      [ "$1" = 'setup' ]; then
  98         [ -z $2 ] && fatal "$1: please specify repository to work on" 1
  99         export VCSH_COMMAND="$1"
 100         export VCSH_REPO_NAME="$2"
 101         export GIT_DIR="$VCSH_BASE/$VCSH_REPO_NAME.git"
 102         shift 2
 103         export VCSH_EXTERNAL_COMMAND="$*"
 104         if [ "$VCSH_COMMAND" = 'run' ]; then
 105                 [ -z "$VCSH_EXTERNAL_COMMAND" ] && fatal "$1 $2: please specify a command" 1
 106         fi
 107 elif [ "$1" = 'help' ] ||
 108      [ "$1" = 'list' ]; then
 109         export VCSH_COMMAND="$1"
 110 else
 111         [ -z $1 ] && help && exit 0
 112         export VCSH_COMMAND='run'
 113         export VCSH_REPO_NAME="$1"
 114         export GIT_DIR="$VCSH_BASE/$VCSH_REPO_NAME.git"
 115         [ -d $GIT_DIR ] || { help; exit 1; }
 116         shift 1
 117         export VCSH_EXTERNAL_COMMAND="git $*"
 118 fi
 119
 120
 121 for check_directory in "$VCSH_BASE" "$HOME/.gitignore.d"
 122 do
 123         if [ ! -d "$check_directory" ]; then
 124                 if [ -e "$check_directory" ]; then
 125                         fatal "$check_directory exists but is not a directory" 13
 126                 else
 127                         info "attempting to create $check_directory"
 128                         mkdir -p "$check_directory" || fatal "could not create $check_directory" 50
 129                 fi
 130         fi
 131 done
 132
 133
 134 if [ "$VCSH_COMMAND" = 'clone' ]; then
 135         verbose "clone begin"
 136         init
 137         git remote add origin "$GIT_REMOTE"
 138         git config branch.master.remote origin
 139         git config branch.master.merge  refs/heads/master
 140         git fetch
 141         for object in $(git ls-tree -r origin/master | awk '{print $4}'); do
 142                 [ -e "$object" ] &&
 143                         error "$object exists." &&
 144                         VCSH_CONFLICT=1;
 145         done
 146         [ "$VCSH_CONFLICT" = '1' ] &&
 147                 fatal "will stop after fetching and not try to merge!
 148   Once this situation has been resolved, run 'vcsh run <foo> git pull' to finish cloning.\n" 17
 149         git merge origin/master
 150         verbose "clone end"
 151
 152 #elif [ "$VCSH_COMMAND" = 'help' ] || [ "$#" -eq 0 ]; then
 153 elif [ "$VCSH_COMMAND" = 'help' ]; then
 154         help
 155
 156 elif [ "$VCSH_COMMAND" = 'delete' ]; then
 157         verbose "delete begin"
 158         old_dir="$PWD"
 159         cd "$HOME"
 160         use || exit $?
 161         info "This operation WILL DETROY DATA!"
 162         files=$(git ls-files)
 163         echo "These files will be deleted:
 164
 165 $files
 166
 167 AGAIN, THIS WILL DELETE YOUR DATA!
 168 To continue, type \"Yes, do as I say\""
 169         read answer
 170         [ "x$answer" = "xYes, do as I say" ] || exit 16
 171         for file in $files; do
 172                 rm -f $file || info "could not delete '$file', continuing with deletion"
 173         done
 174         rm -rf "$GIT_DIR" || info "could not delete '$GIT_DIR'"
 175         cd "$old_dir"
 176         verbose "delete end"
 177
 178 elif [ "$VCSH_COMMAND" = 'enter' ]; then
 179         verbose "enter begin"
 180         use || exit $?
 181         $SHELL
 182         verbose "enter end"
 183
 184 elif [ "$VCSH_COMMAND" = 'init' ]; then
 185         verbose "init begin"
 186         init
 187         verbose "init end"
 188
 189 elif [ "$VCSH_COMMAND" = 'list' ]; then
 190         verbose "list begin"
 191         for i in "$VCSH_BASE"/*.git; do
 192                 echo $(basename "$i" .git)
 193         done
 194         verbose "list end"
 195
 196 elif [ "$VCSH_COMMAND" = 'run' ]; then
 197         verbose "run begin"
 198         use || exit $?
 199         $VCSH_EXTERNAL_COMMAND
 200         verbose "run end"
 201
 202 elif [ "$VCSH_COMMAND" = 'seed-gitignore' ]; then
 203         verbose "seed-gitignore begin"
 204         use || exit $?
 205         # Switching directory as this has to be executed from $HOME to be of any use.
 206         # Going back into old directory at the end in case `vcsh use` is reactivated.
 207         old_dir="$PWD"
 208         cd "$HOME"
 209         gitignores=$(for file in $(git ls-files); do
 210                 while true; do
 211                         echo $file; new="${file%/*}"
 212                         [ "$file" = "$new" ] && break
 213                         file="$new"
 214                 done;
 215         done | sort -u)
 216         tempfile=$(mktemp) || fatal "could not create tempfile" 51
 217         echo '*' > "$tempfile"
 218         for gitignore in $gitignores; do
 219                 echo "$gitignore" | sed 's/^/!/' >> "$tempfile"
 220                 [ -d "$gitignore" ] && echo "$gitignore/*" | sed 's/^/!/'>> "$tempfile"
 221         done
 222         diff -N "$tempfile" "$HOME/.gitignore.d/$VCSH_REPO_NAME" > /dev/null &&
 223                 rm -f "$tempfile" &&
 224                 exit
 225         if [ -e "$HOME/.gitignore.d/$VCSH_REPO_NAME" ]; then
 226                 info "$HOME/.gitignore.d/$VCSH_REPO_NAME differs from new data, moving it to $HOME/.gitignore.d/$VCSH_REPO_NAME.bak"
 227                 mv -f "$HOME/.gitignore.d/$VCSH_REPO_NAME" "$HOME/.gitignore.d/$VCSH_REPO_NAME.bak" ||
 228                         fatal "could not move $HOME/.gitignore.d/$VCSH_REPO_NAME to $HOME/.gitignore.d/$VCSH_REPO_NAME.bak" 53
 229         fi
 230         mv -f "$tempfile" "$HOME/.gitignore.d/$VCSH_REPO_NAME" ||
 231                 fatal "could not move $tempfile to $HOME/.gitignore.d/$VCSH_REPO_NAME" 53
 232         cd "$old_dir"
 233         verbose "seed-gitignore end"
 234
 235 elif [ "$VCSH_COMMAND" = 'setup' ]; then
 236         verbose "seed-gitignore begin"
 237         use   || exit $?
 238         setup || exit $?
 239         verbose "seed-gitignore end"
 240
 241 else
 242         verbose "defaulting to calling help()"
 243         help
 244         fatal "You should never reach this code. File a bug, please." 99
 245
 246 fi