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: $GIT_DIR exists" &&
  50                 return 21
  51         export GIT_WORK_TREE="$HOME"
  52         mkdir -p "$GIT_WORK_TREE"
  53         cd "$GIT_WORK_TREE" ||
  54                 (echo "$SELF: fatal: could not enter $GIT_WORK_TREE" &&
  55                  return 1) || return $?
  56         cd "$GIT_WORK_TREE"
  57         git init
  58         setup
  59         verbose "init() end"
  60 }
  61
  62 use() {
  63         verbose "use() begin"
  64         if [ ! -d "$GIT_DIR" ]; then
  65                 echo E: no repository found for "$VCSH_REPO_NAME" >&2
  66                 return 1
  67         fi
  68         export GIT_DIR
  69         export GIT_WORK_TREE="$(git config --get core.worktree)"
  70         export VCSH_DIRECTORY="$VCSH_REPO_NAME"
  71         verbose "use() end"
  72 }
  73
  74
  75 if [ "$1" = 'clone' ]; then
  76         export VCSH_COMMAND="$1"
  77         GIT_REMOTE="$2"
  78         export GIT_REMOTE
  79         VCSH_REPO_NAME="$3"
  80         [ -z "$VCSH_REPO_NAME" ] && VCSH_REPO_NAME=$(basename "$GIT_REMOTE" .git)
  81         export VCSH_REPO_NAME
  82         export GIT_DIR="$VCSH_BASE/$VCSH_REPO_NAME.git"
  83 elif [ "$1" = 'delete' ] ||
  84      [ "$1" = 'enter' ] ||
  85      [ "$1" = 'init' ] ||
  86      [ "$1" = 'run' ] ||
  87      [ "$1" = 'seed-gitignore' ] ||
  88      [ "$1" = 'setup' ]; then
  89         [ -z $2 ] && echo "$SELF $1: error: please specify repository to work on" && return 1
  90         export VCSH_COMMAND="$1"
  91         export VCSH_REPO_NAME="$2"
  92         export GIT_DIR="$VCSH_BASE/$VCSH_REPO_NAME.git"
  93         shift 2
  94         export VCSH_EXTERNAL_COMMAND="$*"
  95         if [ "$VCSH_COMMAND" = 'run' ]; then
  96                 [ -z "$VCSH_EXTERNAL_COMMAND" ] && echo "$SELF $1 $2: error: please specify a command" && return 1
  97         fi
  98 elif [ "$1" = 'help' ] ||
  99      [ "$1" = 'list' ]; then
 100         export VCSH_COMMAND="$1"
 101 else
 102         [ -z $1 ] && help && return 0
 103         export VCSH_COMMAND='run'
 104         export VCSH_REPO_NAME="$1"
 105         export GIT_DIR="$VCSH_BASE/$VCSH_REPO_NAME.git"
 106         [ -d $GIT_DIR ] || (help && return 1) || return 0
 107         shift 1
 108         export VCSH_EXTERNAL_COMMAND="git $*"
 109 fi
 110
 111
 112 for check_directory in "$VCSH_BASE" "$HOME/.gitignore.d"
 113 do
 114         if [ ! -d "$check_directory" ]; then
 115                 if [ -e "$check_directory" ]; then
 116                         echo "$SELF: error: $check_directory exists but is not a directory" >&2
 117                         return 2
 118                 else
 119                         echo "$SELF: info: attempting to create $check_directory"
 120                         mkdir -p "$check_directory" || (echo "$SELF: error: could not create $check_directory" >&2; return 2) || return $?
 121                 fi
 122         fi
 123 done
 124
 125
 126 if [ "$VCSH_COMMAND" = 'clone' ]; then
 127         verbose "clone begin"
 128         init
 129         git remote add origin "$GIT_REMOTE"
 130         git config branch.master.remote origin
 131         git config branch.master.merge  refs/heads/master
 132         git fetch
 133         for object in $(git ls-tree -r origin/master | awk '{print $4}'); do
 134                 [ -e "$object" ] &&
 135                         echo "$SELF: error: $object exists." &&
 136                         VCSH_CONFLICT=1;
 137         done
 138         [ "$VCSH_CONFLICT" = '1' ] &&
 139                 echo "$SELF: fatal: will stop after fetching and not try to merge!\n" &&
 140                 echo "  Once this situation has been resolved, run 'vcsh run <foo> git pull' to finish cloning.\n" &&
 141                 return 3
 142         git merge origin/master
 143         verbose "clone end"
 144
 145 #elif [ "$VCSH_COMMAND" = 'help' ] || [ "$#" -eq 0 ]; then
 146 elif [ "$VCSH_COMMAND" = 'help' ]; then
 147         help
 148
 149 elif [ "$VCSH_COMMAND" = 'delete' ]; then
 150         verbose "delete begin"
 151         old_dir="$PWD"
 152         cd "$HOME"
 153         use || return $?
 154         echo "$SELF: info: This operation WILL DETROY DATA!"
 155         files=$(git ls-files)
 156         echo "These files will be deleted:
 157
 158 $files
 159
 160 AGAIN, THIS WILL DELETE YOUR DATA!
 161 To continue, type \"Yes, do as I say\""
 162         read answer
 163         [ "x$answer" = "xYes, do as I say" ] || return 1
 164         for file in $files; do
 165                 rm -f $file || echo "$SELF: info: could not delete '$file', continuing with deletion"
 166         done
 167         rm -rf "$GIT_DIR" || echo "$SELF: info: could not delete '$GIT_DIR'"
 168         cd "$old_dir"
 169         verbose "delete end"
 170
 171 elif [ "$VCSH_COMMAND" = 'enter' ]; then
 172         verbose "enter begin"
 173         use || return $?
 174         $SHELL
 175         verbose "enter end"
 176
 177 elif [ "$VCSH_COMMAND" = 'init' ]; then
 178         verbose "init begin"
 179         init
 180         verbose "init end"
 181
 182 elif [ "$VCSH_COMMAND" = 'list' ]; then
 183         verbose "list begin"
 184         for i in "$VCSH_BASE"/*.git; do
 185                 echo $(basename "$i" .git)
 186         done
 187         verbose "list end"
 188
 189 elif [ "$VCSH_COMMAND" = 'run' ]; then
 190         verbose "run begin"
 191         use || return $?
 192         $VCSH_EXTERNAL_COMMAND
 193         verbose "run end"
 194
 195 elif [ "$VCSH_COMMAND" = 'seed-gitignore' ]; then
 196         verbose "seed-gitignore begin"
 197         use || return $?
 198         # Switching directory as this has to be executed from $HOME to be of any use.
 199         # Going back into old directory at the end in case `vcsh use` is reactivated.
 200         old_dir="$PWD"
 201         cd "$HOME"
 202         gitignores=$(for file in $(git ls-files); do
 203                 while true; do
 204                         echo $file; new="${file%/*}"
 205                         [ "$file" = "$new" ] && break
 206                         file="$new"
 207                 done;
 208         done | sort -u)
 209         tempfile=$(mktemp) ||
 210                 (echo "$SELF: fatal: could not create tempfile" && return 1) || return $?
 211         echo '*' > "$tempfile"
 212         for gitignore in $gitignores; do
 213                 echo "$gitignore" | sed 's/^/!/' >> "$tempfile"
 214                 [ -d "$gitignore" ] && echo "$gitignore/*" | sed 's/^/!/'>> "$tempfile"
 215         done
 216         diff -N "$tempfile" "$HOME/.gitignore.d/$VCSH_REPO_NAME" > /dev/null &&
 217                 rm -f "$tempfile" &&
 218                 return
 219         if [ -e "$HOME/.gitignore.d/$VCSH_REPO_NAME" ]; then
 220                 echo "$SELF: info: $HOME/.gitignore.d/$VCSH_REPO_NAME differs from new data, moving it to $HOME/.gitignore.d/$VCSH_REPO_NAME.bak"
 221                 mv -f "$HOME/.gitignore.d/$VCSH_REPO_NAME" "$HOME/.gitignore.d/$VCSH_REPO_NAME.bak" ||
 222                         (echo "$SELF: fatal: could not move $HOME/.gitignore.d/$VCSH_REPO_NAME to $HOME/.gitignore.d/$VCSH_REPO_NAME.bak" &&
 223                          return 1) || return $?
 224         fi
 225         mv -f "$tempfile" "$HOME/.gitignore.d/$VCSH_REPO_NAME" ||
 226                 (echo "$SELF: fatal: could not move $tempfile to $HOME/.gitignore.d/$VCSH_REPO_NAME" && return 1) || return $?
 227         cd "$old_dir"
 228         verbose "seed-gitignore end"
 229
 230 elif [ "$VCSH_COMMAND" = 'setup' ]; then
 231         verbose "seed-gitignore begin"
 232         use   || return $?
 233         setup || return $?
 234         verbose "seed-gitignore end"
 235
 236 else
 237         verbose "defaulting to calling help()"
 238         help
 239         echo "$SELF: fatal: You should never reach this code. File a bug, please."
 240         return 99
 241
 242 fi