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: $@"; fi
  36 }
  37
  38 setup() {
  39         git config core.worktree     "$GIT_WORK_TREE"
  40         git config core.excludesfile ".gitignore.d/$VCSH_REPO_NAME"
  41         git config vcsh.vcsh         'true'
  42         touch   "$HOME/.gitignore.d/$VCSH_REPO_NAME"
  43         git add "$HOME/.gitignore.d/$VCSH_REPO_NAME"
  44 }
  45
  46 init() {
  47         verbose "init() begin"
  48         [ -e "$GIT_DIR" ] &&
  49                 echo "$SELF: fatal: $GIT_DIR exists" &&
  50                 return 10
  51         export GIT_WORK_TREE="$HOME"
  52         mkdir -p "$GIT_WORK_TREE"
  53         cd "$GIT_WORK_TREE" ||
  54                 { echo "$SELF: fatal: could not enter $GIT_WORK_TREE"; return 11; }
  55         cd "$GIT_WORK_TREE"
  56         git init
  57         setup
  58         verbose "init() end"
  59 }
  60
  61 use() {
  62         verbose "use() begin"
  63         if [ ! -d "$GIT_DIR" ]; then
  64                 echo E: no repository found for "$VCSH_REPO_NAME" >&2
  65                 return 12
  66         fi
  67         export GIT_DIR
  68         export GIT_WORK_TREE="$(git config --get core.worktree)"
  69         export VCSH_DIRECTORY="$VCSH_REPO_NAME"
  70         verbose "use() end"
  71 }
  72
  73
  74 if [ "$1" = 'clone' ]; then
  75         export VCSH_COMMAND="$1"
  76         GIT_REMOTE="$2"
  77         export GIT_REMOTE
  78         VCSH_REPO_NAME="$3"
  79         [ -z "$VCSH_REPO_NAME" ] && VCSH_REPO_NAME=$(basename "$GIT_REMOTE" .git)
  80         export VCSH_REPO_NAME
  81         export GIT_DIR="$VCSH_BASE/$VCSH_REPO_NAME.git"
  82 elif [ "$1" = 'delete' ] ||
  83      [ "$1" = 'enter' ] ||
  84      [ "$1" = 'init' ] ||
  85      [ "$1" = 'run' ] ||
  86      [ "$1" = 'seed-gitignore' ] ||
  87      [ "$1" = 'setup' ]; then
  88         [ -z $2 ] && echo "$SELF $1: error: please specify repository to work on" && exit 1
  89         export VCSH_COMMAND="$1"
  90         export VCSH_REPO_NAME="$2"
  91         export GIT_DIR="$VCSH_BASE/$VCSH_REPO_NAME.git"
  92         shift 2
  93         export VCSH_EXTERNAL_COMMAND="$*"
  94         if [ "$VCSH_COMMAND" = 'run' ]; then
  95                 [ -z "$VCSH_EXTERNAL_COMMAND" ] && echo "$SELF $1 $2: error: please specify a command" && exit 1
  96         fi
  97 elif [ "$1" = 'help' ] ||
  98      [ "$1" = 'list' ]; then
  99         export VCSH_COMMAND="$1"
 100 else
 101         [ -z $1 ] && help && exit 0
 102         export VCSH_COMMAND='run'
 103         export VCSH_REPO_NAME="$1"
 104         export GIT_DIR="$VCSH_BASE/$VCSH_REPO_NAME.git"
 105         [ -d $GIT_DIR ] || { help; exit 1; }
 106         shift 1
 107         export VCSH_EXTERNAL_COMMAND="git $*"
 108 fi
 109
 110
 111 for check_directory in "$VCSH_BASE" "$HOME/.gitignore.d"
 112 do
 113         if [ ! -d "$check_directory" ]; then
 114                 if [ -e "$check_directory" ]; then
 115                         echo "$SELF: fatal: $check_directory exists but is not a directory" >&2
 116                         exit 13
 117                 else
 118                         echo "$SELF: info: attempting to create $check_directory"
 119                         mkdir -p "$check_directory" || { echo "$SELF: fatal: could not create $check_directory" >&2; exit 50; }
 120                 fi
 121         fi
 122 done
 123
 124
 125 if [ "$VCSH_COMMAND" = 'clone' ]; then
 126         verbose "clone begin"
 127         init
 128         git remote add origin "$GIT_REMOTE"
 129         git config branch.master.remote origin
 130         git config branch.master.merge  refs/heads/master
 131         git fetch
 132         for object in $(git ls-tree -r origin/master | awk '{print $4}'); do
 133                 [ -e "$object" ] &&
 134                         echo "$SELF: error: $object exists." &&
 135                         VCSH_CONFLICT=1;
 136         done
 137         [ "$VCSH_CONFLICT" = '1' ] &&
 138                 echo "$SELF: fatal: will stop after fetching and not try to merge!\n" &&
 139                 echo "  Once this situation has been resolved, run 'vcsh run <foo> git pull' to finish cloning.\n" &&
 140                 exit 17
 141         git merge origin/master
 142         verbose "clone end"
 143
 144 #elif [ "$VCSH_COMMAND" = 'help' ] || [ "$#" -eq 0 ]; then
 145 elif [ "$VCSH_COMMAND" = 'help' ]; then
 146         help
 147
 148 elif [ "$VCSH_COMMAND" = 'delete' ]; then
 149         verbose "delete begin"
 150         old_dir="$PWD"
 151         cd "$HOME"
 152         use || exit $?
 153         echo "$SELF: info: This operation WILL DETROY DATA!"
 154         files=$(git ls-files)
 155         echo "These files will be deleted:
 156
 157 $files
 158
 159 AGAIN, THIS WILL DELETE YOUR DATA!
 160 To continue, type \"Yes, do as I say\""
 161         read answer
 162         [ "x$answer" = "xYes, do as I say" ] || exit 16
 163         for file in $files; do
 164                 rm -f $file || echo "$SELF: info: could not delete '$file', continuing with deletion"
 165         done
 166         rm -rf "$GIT_DIR" || echo "$SELF: info: could not delete '$GIT_DIR'"
 167         cd "$old_dir"
 168         verbose "delete end"
 169
 170 elif [ "$VCSH_COMMAND" = 'enter' ]; then
 171         verbose "enter begin"
 172         use || exit $?
 173         $SHELL
 174         verbose "enter end"
 175
 176 elif [ "$VCSH_COMMAND" = 'init' ]; then
 177         verbose "init begin"
 178         init
 179         verbose "init end"
 180
 181 elif [ "$VCSH_COMMAND" = 'list' ]; then
 182         verbose "list begin"
 183         for i in "$VCSH_BASE"/*.git; do
 184                 echo $(basename "$i" .git)
 185         done
 186         verbose "list end"
 187
 188 elif [ "$VCSH_COMMAND" = 'run' ]; then
 189         verbose "run begin"
 190         use || exit $?
 191         $VCSH_EXTERNAL_COMMAND
 192         verbose "run end"
 193
 194 elif [ "$VCSH_COMMAND" = 'seed-gitignore' ]; then
 195         verbose "seed-gitignore begin"
 196         use || exit $?
 197         # Switching directory as this has to be executed from $HOME to be of any use.
 198         # Going back into old directory at the end in case `vcsh use` is reactivated.
 199         old_dir="$PWD"
 200         cd "$HOME"
 201         gitignores=$(for file in $(git ls-files); do
 202                 while true; do
 203                         echo $file; new="${file%/*}"
 204                         [ "$file" = "$new" ] && break
 205                         file="$new"
 206                 done;
 207         done | sort -u)
 208         tempfile=$(mktemp) ||
 209                 { echo "$SELF: fatal: could not create tempfile"; exit 51; }
 210         echo '*' > "$tempfile"
 211         for gitignore in $gitignores; do
 212                 echo "$gitignore" | sed 's/^/!/' >> "$tempfile"
 213                 [ -d "$gitignore" ] && echo "$gitignore/*" | sed 's/^/!/'>> "$tempfile"
 214         done
 215         diff -N "$tempfile" "$HOME/.gitignore.d/$VCSH_REPO_NAME" > /dev/null &&
 216                 rm -f "$tempfile" &&
 217                 exit
 218         if [ -e "$HOME/.gitignore.d/$VCSH_REPO_NAME" ]; then
 219                 echo "$SELF: info: $HOME/.gitignore.d/$VCSH_REPO_NAME differs from new data, moving it to $HOME/.gitignore.d/$VCSH_REPO_NAME.bak"
 220                 mv -f "$HOME/.gitignore.d/$VCSH_REPO_NAME" "$HOME/.gitignore.d/$VCSH_REPO_NAME.bak" ||
 221                         { echo "$SELF: fatal: could not move $HOME/.gitignore.d/$VCSH_REPO_NAME to $HOME/.gitignore.d/$VCSH_REPO_NAME.bak"; exit 53; }
 222         fi
 223         mv -f "$tempfile" "$HOME/.gitignore.d/$VCSH_REPO_NAME" ||
 224                 { echo "$SELF: fatal: could not move $tempfile to $HOME/.gitignore.d/$VCSH_REPO_NAME" && exit 53; }
 225         cd "$old_dir"
 226         verbose "seed-gitignore end"
 227
 228 elif [ "$VCSH_COMMAND" = 'setup' ]; then
 229         verbose "seed-gitignore begin"
 230         use   || exit $?
 231         setup || exit $?
 232         verbose "seed-gitignore end"
 233
 234 else
 235         verbose "defaulting to calling help()"
 236         help
 237         echo "$SELF: fatal: You should never reach this code. File a bug, please."
 238         exit 99
 239
 240 fi