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[code/vcsh.git] / vcsh
1 #!/bin/sh
2
3 # This program is licensed under the GNU GPL version 2 or later.
4 # (c) Richard "RichiH" Hartmann <richih.mailinglist@gmail.com>, 2011-2013
5 # For details, see LICENSE. To submit patches, you have to agree to
6 # license your code under the GNU GPL version 2 or later.
7
8 # While the following is not legally binding, the author would like to
9 # explain the choice of GPLv2+ over GPLv3+.
10 # The author prefers GPLv3+ over GPLv2+ but feels it's better to maintain
11 # full compability with git. In case git ever changes its licensing terms,
12 # which is admittedly extremely unlikely to the point of being impossible,
13 # this software will most likely follow suit.
14
15 SELF=$(basename $0)
16 VERSION='1.2'
17
18 fatal() {
19         echo "$SELF: fatal: $1" >&2
20         exit $2
21 }
22
23 # We need to run getops as soon as possible so we catch -d and other
24 # options that will modify our behaviour.
25 # Commands are handled at the end of this script.
26 while getopts  "c:dv" flag; do
27         if [ "$1" = '-d' ] || [ "$1" = '--debug' ]; then
28                 set -vx
29                 VCSH_DEBUG=1
30         elif [ "$1" = '-v' ];then
31                 VCSH_VERBOSE=1
32         elif [ "$1" = '-c' ];then
33                 VCSH_OPTION_CONFIG=$OPTARG
34         fi
35         shift 1
36 done
37
38 source_all() {
39         # Source file even if it's in $PWD and does not have any slashes in it
40         case "$1" in
41                 */*) . "$1";;
42                 *)   . "$PWD/$1";;
43         esac;
44 }
45
46
47 # Read configuration and set defaults if anything's not set
48 [ -n "$VCSH_DEBUG" ]                  && set -vx
49 [ -z "$XDG_CONFIG_HOME" ]             && XDG_CONFIG_HOME="$HOME/.config"
50
51 # Read configuration files if there are any
52 [ -r "/etc/vcsh/config" ]             && . "/etc/vcsh/config"
53 [ -r "$XDG_CONFIG_HOME/vcsh/config" ] && . "$XDG_CONFIG_HOME/vcsh/config"
54 if [ -n "$VCSH_OPTION_CONFIG" ]; then
55         # Source $VCSH_OPTION_CONFIG if it can be read and is in $PWD of $PATH
56         if [ -r "$VCSH_OPTION_CONFIG" ]; then
57                 source_all "$VCSH_OPTION_CONFIG"
58         else
59                 fatal "Can not read configuration file '$VCSH_OPTION_CONFIG'" 1
60         fi
61 fi
62 [ -n "$VCSH_DEBUG" ]                  && set -vx
63
64 # Read defaults
65 [ -z "$VCSH_REPO_D" ]                 && VCSH_REPO_D="$XDG_CONFIG_HOME/vcsh/repo.d"
66 [ -z "$VCSH_HOOK_D" ]                 && VCSH_HOOK_D="$XDG_CONFIG_HOME/vcsh/hooks-enabled"
67 [ -z "$VCSH_BASE" ]                   && VCSH_BASE="$HOME"
68 [ -z "$VCSH_GITIGNORE" ]              && VCSH_GITIGNORE='exact'
69
70
71 help() {
72         echo "usage: $SELF <options> <command>
73
74    options:
75    -c <file>            Source file
76    -d                   Enable debug mode
77    -v                   Enable verbose mode
78
79    commands:
80    clone <remote> \\
81          [<repo>]       Clone from an existing repository
82    delete <repo>        Delete an existing repository
83    enter <repo>         Enter repository; spawn new instance of \$SHELL
84    help                 Display this help text
85    init <repo>          Initialize a new repository
86    list                 List all repositories
87    list-tracked         List all files tracked by vcsh
88    list-tracked-by \\
89         <repo>          List files tracked by a repository
90    rename <repo> \\
91           <newname>     Rename repository
92    run <repo> \\
93        <command>        Use this repository
94    setup <repo>         Set up repository with recommended settings
95    version              Print version information
96    which <substring>    Find substring in name of any tracked file
97    write-gitignore \\
98    <repo>               Write .gitignore.d/<repo> via git ls-files
99
100    <repo> <git command> Shortcut to run git commands directly
101    <repo>               Shortcut to enter repository" >&2
102 }
103
104 debug() {
105         [ -n "$VCSH_DEBUG" ] && echo "$SELF: debug: $@"
106 }
107
108 verbose() {
109         if [ -n "$VCSH_DEBUG" ] || [ -n "$VCSH_VERBOSE" ]; then echo "$SELF: verbose: $@"; fi
110 }
111
112 error() {
113         echo "$SELF: error: $1" >&2
114 }
115
116 info() {
117         echo "$SELF: info: $1"
118 }
119
120 clone() {
121         init
122         git remote add origin "$GIT_REMOTE"
123         git config branch.master.remote origin
124         git config branch.master.merge  refs/heads/master
125         if [ $(git ls-remote origin master 2> /dev/null | wc -l ) -lt 1 ]; then
126                 info "remote is empty, not merging anything"
127                 exit
128         fi
129         git fetch
130         for object in $(git ls-tree -r origin/master | awk '{print $4}'); do
131                 [ -e "$object" ] &&
132                         error "'$object' exists." &&
133                         VCSH_CONFLICT=1;
134         done
135         [ "$VCSH_CONFLICT" = '1' ] &&
136                 fatal "will stop after fetching and not try to merge!
137   Once this situation has been resolved, run 'vcsh run $VCSH_REPO_NAME git pull' to finish cloning.\n" 17
138         git merge origin/master
139 }
140
141 delete() {
142         cd "$VCSH_BASE" || fatal "could not enter '$VCSH_BASE'" 11
143         use
144         info "This operation WILL DESTROY DATA!"
145         files=$(git ls-files)
146         echo "These files will be deleted:
147
148 $files
149
150 AGAIN, THIS WILL DELETE YOUR DATA!
151 To continue, type 'Yes, do as I say'"
152         read answer
153         [ "x$answer" = 'xYes, do as I say' ] || exit 16
154         for file in $files; do
155                 rm -f $file || info "could not delete '$file', continuing with deletion"
156         done
157         rm -rf "$GIT_DIR" || error "could not delete '$GIT_DIR'"
158 }
159
160 enter() {
161         hook pre-enter
162         use
163         $SHELL
164         hook post-enter
165 }
166
167 git_dir_exists() {
168         [ -d "$GIT_DIR" ] || fatal "no repository found for '$VCSH_REPO_NAME'" 12
169 }
170
171 hook() {
172         for hook in $VCSH_HOOK_D/$1* $VCSH_HOOK_D/$VCSH_REPO_NAME.$1*; do
173                 [ -x "$hook" ] || continue
174                 verbose "executing '$hook'"
175                 "$hook"
176         done
177 }
178
179 init() {
180         [ ! -e "$GIT_DIR" ] || fatal "'$GIT_DIR' exists" 10
181         export GIT_WORK_TREE="$VCSH_BASE"
182         mkdir -p "$GIT_WORK_TREE" || fatal "could not create '$GIT_WORK_TREE'" 50
183         cd "$GIT_WORK_TREE" || fatal "could not enter '$GIT_WORK_TREE'" 11
184         git init
185         setup
186 }
187
188 list() {
189         for repo in "$VCSH_REPO_D"/*.git; do
190                 [ -d "$repo" ] && [ -r "$repo" ] && echo $(basename "$repo" .git)
191         done
192 }
193
194 get_files() {
195         export GIT_DIR="$VCSH_REPO_D/$VCSH_REPO_NAME.git"
196         git ls-files
197 }
198
199 list_tracked() {
200         for VCSH_REPO_NAME in $(list); do
201                 get_files
202         done | sort -u
203 }
204
205 list_tracked_by() {
206         use
207         git ls-files | sort -u
208 }
209
210 rename() {
211         git_dir_exists
212         [ -d "$GIT_DIR_NEW" ] && fatal "'$GIT_DIR_NEW' exists" 54
213         mv -f "$GIT_DIR" "$GIT_DIR_NEW" || fatal "Could not mv '$GIT_DIR' '$GIT_DIR_NEW'" 52
214
215 }
216
217 run() {
218         hook pre-run
219         use
220         "$@"
221         hook post-run
222 }
223
224 setup() {
225         hook pre-setup
226         use
227         git config core.worktree     "$GIT_WORK_TREE"
228         git config core.excludesfile ".gitignore.d/$VCSH_REPO_NAME"
229         git config vcsh.vcsh         'true'
230         [ -e "$VCSH_BASE/.gitignore.d/$VCSH_REPO_NAME" ] && git add -f "$VCSH_BASE/.gitignore.d/$VCSH_REPO_NAME"
231         hook post-setup
232 }
233
234 use() {
235         git_dir_exists
236         export GIT_WORK_TREE="$(git config --get core.worktree)"
237         export VCSH_DIRECTORY="$VCSH_REPO_NAME"
238 }
239
240 which() {
241         for VCSH_REPO_NAME in $(list); do
242                 for VCSH_FILE in $(get_files); do
243                         echo $VCSH_FILE | grep -q "$VCSH_COMMAND_PARAMETER" && echo "$VCSH_REPO_NAME: $VCSH_FILE"
244                 done
245         done | sort -u
246 }
247
248 write_gitignore() {
249         use
250         cd "$VCSH_BASE" || fatal "could not enter '$VCSH_BASE'" 11
251         gitignores=$(for file in $(git ls-files); do
252                 while true; do
253                         echo $file; new="${file%/*}"
254                         [ "$file" = "$new" ] && break
255                         file="$new"
256                 done;
257         done | sort -u)
258         tempfile=$(mktemp) || fatal "could not create tempfile" 51
259         echo '*' > "$tempfile" || fatal "could not write to '$tempfile'" 57
260         for gitignore in $gitignores; do
261                 echo "$gitignore" | sed 's@^@!/@' >> "$tempfile" || fatal "could not write to '$tempfile'" 57
262                 if [ x$VCSH_GITIGNORE = x'recursive' ] && [ -d "$gitignore" ]; then
263                         { echo "$gitignore/*" | sed 's@^@!/@' >> "$tempfile" || fatal "could not write to '$tempfile'" 57; }
264                 fi
265         done
266         if diff -N "$tempfile" "$VCSH_BASE/.gitignore.d/$VCSH_REPO_NAME" > /dev/null; then
267                 rm -f "$tempfile" || error "could not delete '$tempfile'"
268                 exit
269         fi
270         if [ -e "$VCSH_BASE/.gitignore.d/$VCSH_REPO_NAME" ]; then
271                 info "'$VCSH_BASE/.gitignore.d/$VCSH_REPO_NAME' differs from new data, moving it to '$VCSH_BASE/.gitignore.d/$VCSH_REPO_NAME.bak'"
272                 mv -f "$VCSH_BASE/.gitignore.d/$VCSH_REPO_NAME" "$VCSH_BASE/.gitignore.d/$VCSH_REPO_NAME.bak" ||
273                         fatal "could not move '$VCSH_BASE/.gitignore.d/$VCSH_REPO_NAME' to '$VCSH_BASE/.gitignore.d/$VCSH_REPO_NAME.bak'" 53
274         fi
275         mv -f "$tempfile" "$VCSH_BASE/.gitignore.d/$VCSH_REPO_NAME" ||
276                 fatal "could not move '$tempfile' to '$VCSH_BASE/.gitignore.d/$VCSH_REPO_NAME'" 53
277 }
278
279 if [ ! "x$VCSH_GITIGNORE" = 'xexact' ] && [ ! "x$VCSH_GITIGNORE" = 'xrecursive' ]; then
280         fatal "'\$VCSH_GITIGNORE' must be either 'exact' or 'recursive'" 1
281 fi
282
283 if [ "$1" = 'clone' ]; then
284         [ -z "$2" ] && fatal "$1: please specify a remote" 1
285         export VCSH_COMMAND="$1"
286         GIT_REMOTE="$2"
287         [ -n "$3" ] && VCSH_REPO_NAME="$3" || VCSH_REPO_NAME=$(basename "$GIT_REMOTE" .git)
288         export VCSH_REPO_NAME
289         export GIT_DIR="$VCSH_REPO_D/$VCSH_REPO_NAME.git"
290 elif [ "$1" = 'version' ]; then
291         echo "$SELF $VERSION"
292         exit
293 elif [ "$1" = 'which' ]; then
294         [ -z "$2" ] && fatal "$1: please specify a filename" 1
295         [ -n "$3" ] && fatal "$1: too many parameters" 1
296         export VCSH_COMMAND="$1"
297         export VCSH_COMMAND_PARAMETER="$2"
298 elif [ "$1" = 'delete' ]           ||
299      [ "$1" = 'enter' ]            ||
300      [ "$1" = 'init' ]             ||
301      [ "$1" = 'list-tracked-by' ]  ||
302      [ "$1" = 'rename' ]           ||
303      [ "$1" = 'run' ]              ||
304      [ "$1" = 'setup' ]            ||
305      [ "$1" = 'write-gitignore' ]; then
306         [ -z $2 ]                      && fatal "$1: please specify repository to work on" 1
307         [ "$1" = 'rename' -a -z "$3" ] && fatal "$1: please specify a target name" 1
308         [ "$1" = 'run' -a -z "$3" ]    && fatal "$1: please specify a command" 1
309         export VCSH_COMMAND="$1"
310         export VCSH_REPO_NAME="$2"
311         export GIT_DIR="$VCSH_REPO_D/$VCSH_REPO_NAME.git"
312         [ "$VCSH_COMMAND" = 'rename' ]         && export GIT_DIR_NEW="$VCSH_REPO_D/$3.git"
313         [ "$VCSH_COMMAND" = 'run' ] && shift 2
314         [ "$VCSH_COMMAND" = 'write-gitignore' ]
315 elif [ "$1" = 'list' ] ||
316      [ "$1" = 'list-tracked' ]; then
317         export VCSH_COMMAND="$1"
318 elif [ -n "$2" ]; then
319         export VCSH_COMMAND='run'
320         export VCSH_REPO_NAME="$1"
321         export GIT_DIR="$VCSH_REPO_D/$VCSH_REPO_NAME.git"
322         [ -d $GIT_DIR ] || { help; exit 1; }
323         shift 1
324         set -- "git" "$@"
325 elif [ -n "$1" ]; then
326         export VCSH_COMMAND='enter'
327         export VCSH_REPO_NAME="$1"
328         export GIT_DIR="$VCSH_REPO_D/$VCSH_REPO_NAME.git"
329         [ -d $GIT_DIR ] || { help; exit 1; }
330 else
331         # $1 is empty, or 'help'
332         help && exit
333 fi
334
335 # Did we receive a directory instead of a name?
336 # Mangle the input to fit normal operation.
337 if echo $VCSH_REPO_NAME | grep -q '/'; then
338         export GIT_DIR=$VCSH_REPO_NAME
339         export VCSH_REPO_NAME=$(basename "$VCSH_REPO_NAME" .git)
340 fi
341
342
343 for check_directory in "$VCSH_REPO_D" "$VCSH_BASE/.gitignore.d"
344 do
345         if [ ! -d "$check_directory" ]; then
346                 if [ -e "$check_directory" ]; then
347                         fatal "'$check_directory' exists but is not a directory" 13
348                 else
349                         info "attempting to create '$check_directory'"
350                         mkdir -p "$check_directory" || fatal "could not create '$check_directory'" 50
351                 fi
352         fi
353 done
354
355 verbose "$VCSH_COMMAND begin"
356 export VCSH_COMMAND=$(echo $VCSH_COMMAND | sed 's/-/_/g')
357 hook pre-command
358 $VCSH_COMMAND "$@"
359 hook post-command
360 verbose "$VCSH_COMMAND end, exiting"