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Various fixes to readme
[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@debian.org>, 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 compatibility's 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 # This should always be the first line of code to facilitate debugging
16 [ -n "$VCSH_DEBUG" ] && set -vx
17
18
19 # If '.git-HEAD' is appended to the version, you are seeing an unreleased
20 # version of vcsh; the master branch is supposed to be clean at all times
21 # so you can most likely just use it nonetheless
22 VERSION='1.20131229.git-HEAD'
23 SELF=$(basename $0)
24
25 fatal() {
26         echo "$SELF: fatal: $1" >&2
27         exit $2
28 }
29
30 # We need to run getops as soon as possible so we catch -d and other
31 # options that will modify our behaviour.
32 # Commands are handled at the end of this script.
33 while getopts "c:dv" flag; do
34         if [ "$1" = '-d' ] || [ "$1" = '--debug' ]; then
35                 set -vx
36                 VCSH_DEBUG=1
37                 echo "debug mode on"
38                 echo "$SELF $VERSION"
39         elif [ "$1" = '-v' ]; then
40                 VCSH_VERBOSE=1
41                 echo "verbose mode on"
42                 echo "$SELF $VERSION"
43         elif [ "$1" = '-c' ]; then
44                 VCSH_OPTION_CONFIG=$OPTARG
45         fi
46         shift 1
47 done
48
49 source_all() {
50         # Source file even if it's in $PWD and does not have any slashes in it
51         case "$1" in
52                 */*) . "$1";;
53                 *)   . "$PWD/$1";;
54         esac;
55 }
56
57
58 # Read configuration and set defaults if anything's not set
59 [ -n "$VCSH_DEBUG" ]                  && set -vx
60 : ${XDG_CONFIG_HOME:=$HOME/.config}
61
62 # Read configuration files if there are any
63 [ -r "/etc/vcsh/config" ]             && . "/etc/vcsh/config"
64 [ -r "$XDG_CONFIG_HOME/vcsh/config" ] && . "$XDG_CONFIG_HOME/vcsh/config"
65 if [ -n "$VCSH_OPTION_CONFIG" ]; then
66         # Source $VCSH_OPTION_CONFIG if it can be read and is in $PWD of $PATH
67         if [ -r "$VCSH_OPTION_CONFIG" ]; then
68                 source_all "$VCSH_OPTION_CONFIG"
69         else
70                 fatal "Can not read configuration file '$VCSH_OPTION_CONFIG'" 1
71         fi
72 fi
73 [ -n "$VCSH_DEBUG" ]                  && set -vx
74
75 # Read defaults
76 : ${VCSH_REPO_D:=$XDG_CONFIG_HOME/vcsh/repo.d}
77 : ${VCSH_HOOK_D:=$XDG_CONFIG_HOME/vcsh/hooks-enabled}
78 : ${VCSH_BASE:=$HOME}
79 : ${VCSH_GITIGNORE:=exact}
80 : ${VCSH_WORKTREE:=absolute}
81
82 if [ ! "x$VCSH_GITIGNORE" = 'xexact' ] && [ ! "x$VCSH_GITIGNORE" = 'xnone' ] && [ ! "x$VCSH_GITIGNORE" = 'xrecursive' ]; then
83         fatal "'\$VCSH_GITIGNORE' must equal 'exact', 'none', or 'recursive'" 1
84 fi
85
86 if [ ! "x$VCSH_WORKTREE" = 'xabsolute' ] && [ ! "x$VCSH_WORKTREE" = 'xrelative' ]; then
87         fatal "'\$VCSH_WORKTREE' must equal 'absolute', or 'relative'" 1
88 fi
89
90
91 help() {
92         echo "usage: $SELF <options> <command>
93
94    options:
95    -c <file>            Source file
96    -d                   Enable debug mode
97    -v                   Enable verbose mode
98
99    commands:
100    clone <remote> \\
101          [<repo>]       Clone from an existing repository
102    commit               Commit in all repositories
103    delete <repo>        Delete an existing repository
104    enter <repo>         Enter repository; spawn new instance of \$SHELL
105    help                 Display this help text
106    init <repo>          Initialize a new repository
107    list                 List all repositories
108    list-tracked         List all files tracked by vcsh
109    list-tracked-by \\
110         <repo>          List files tracked by a repository
111    pull                 Pull from all vcsh remotes
112    push                 Push to vcsh remotes
113    rename <repo> \\
114           <newname>     Rename repository
115    run <repo> \\
116        <command>        Use this repository
117    status [<repo>]      Show statuses of all/one vcsh repositories
118    upgrade <repo>       Upgrade repository to currently recommended settings
119    version              Print version information
120    which <substring>    Find substring in name of any tracked file
121    write-gitignore \\
122    <repo>               Write .gitignore.d/<repo> via git ls-files
123
124    <repo> <git command> Shortcut to run git commands directly
125    <repo>               Shortcut to enter repository" >&2
126 }
127
128 debug() {
129         [ -n "$VCSH_DEBUG" ] && echo "$SELF: debug: $@"
130 }
131
132 verbose() {
133         if [ -n "$VCSH_DEBUG" ] || [ -n "$VCSH_VERBOSE" ]; then echo "$SELF: verbose: $@"; fi
134 }
135
136 error() {
137         echo "$SELF: error: $1" >&2
138 }
139
140 info() {
141         echo "$SELF: info: $1"
142 }
143
144 clone() {
145         hook pre-clone
146         init
147         git remote add origin "$GIT_REMOTE"
148         git config branch.master.remote origin
149         git config branch.master.merge  refs/heads/master
150         if [ $(git ls-remote origin master 2> /dev/null | wc -l ) -lt 1 ]; then
151                 info "remote is empty, not merging anything"
152                 exit
153         fi
154         git fetch
155         hook pre-merge
156         git ls-tree -r --name-only origin/master | (while read object; do
157                 [ -e "$object" ] &&
158                         error "'$object' exists." &&
159                         VCSH_CONFLICT=1
160         done
161         [ "$VCSH_CONFLICT" = '1' ]) &&
162                 fatal "will stop after fetching and not try to merge!
163   Once this situation has been resolved, run 'vcsh run $VCSH_REPO_NAME git pull' to finish cloning." 17
164         git merge origin/master
165         hook post-merge
166         hook post-clone
167         retire
168         hook post-clone-retired
169 }
170
171 commit() {
172         hook pre-commit
173         for VCSH_REPO_NAME in $(list); do
174                 echo "$VCSH_REPO_NAME: "
175                 export GIT_DIR="$VCSH_REPO_D/$VCSH_REPO_NAME.git"
176                 use
177                 git commit --untracked-files=no --quiet
178                 VCSH_COMMAND_RETURN_CODE=$?
179                 echo
180         done
181         hook post-commit
182 }
183
184 delete() {
185         cd "$VCSH_BASE" || fatal "could not enter '$VCSH_BASE'" 11
186         use
187         info "This operation WILL DESTROY DATA!"
188         files=$(git ls-files)
189         echo "These files will be deleted:
190
191 $files
192
193 AGAIN, THIS WILL DELETE YOUR DATA!
194 To continue, type 'Yes, do as I say'"
195         read answer
196         [ "x$answer" = 'xYes, do as I say' ] || exit 16
197         for file in $files; do
198                 rm -f $file || info "could not delete '$file', continuing with deletion"
199         done
200         rm -rf "$GIT_DIR" || error "could not delete '$GIT_DIR'"
201 }
202
203 enter() {
204         hook pre-enter
205         use
206         $SHELL
207         hook post-enter
208 }
209
210 git_dir_exists() {
211         [ -d "$GIT_DIR" ] || fatal "no repository found for '$VCSH_REPO_NAME'" 12
212 }
213
214 hook() {
215         for hook in $VCSH_HOOK_D/$1* $VCSH_HOOK_D/$VCSH_REPO_NAME.$1*; do
216                 [ -x "$hook" ] || continue
217                 verbose "executing '$hook'"
218                 "$hook"
219         done
220 }
221
222 init() {
223         hook pre-init
224         [ ! -e "$GIT_DIR" ] || fatal "'$GIT_DIR' exists" 10
225         mkdir -p "$VCSH_BASE" || fatal "could not create '$VCSH_BASE'" 50
226         cd "$VCSH_BASE" || fatal "could not enter '$VCSH_BASE'" 11
227         git init --shared=0600
228         upgrade
229         hook post-init
230 }
231
232 list() {
233         for repo in "$VCSH_REPO_D"/*.git; do
234                 [ -d "$repo" ] && [ -r "$repo" ] && echo $(basename "$repo" .git)
235         done
236 }
237
238 get_files() {
239         export GIT_DIR="$VCSH_REPO_D/$VCSH_REPO_NAME.git"
240         git ls-files
241 }
242
243 list_tracked() {
244         for VCSH_REPO_NAME in $(list); do
245                 get_files
246         done | sort -u
247 }
248
249 list_tracked_by() {
250         use
251         git ls-files | sort -u
252 }
253
254 pull() {
255         hook pre-pull
256         for VCSH_REPO_NAME in $(list); do
257                 printf "$VCSH_REPO_NAME: "
258                 export GIT_DIR="$VCSH_REPO_D/$VCSH_REPO_NAME.git"
259                 use
260                 git pull
261                 VCSH_COMMAND_RETURN_CODE=$?
262                 echo
263         done
264         hook post-pull
265 }
266
267 push() {
268         hook pre-push
269         for VCSH_REPO_NAME in $(list); do
270                 printf "$VCSH_REPO_NAME: "
271                 export GIT_DIR="$VCSH_REPO_D/$VCSH_REPO_NAME.git"
272                 use
273                 git push
274                 VCSH_COMMAND_RETURN_CODE=$?
275                 echo
276         done
277         hook post-push
278 }
279
280 retire() {
281         unset VCSH_DIRECTORY
282 }
283
284 rename() {
285         git_dir_exists
286         [ -d "$GIT_DIR_NEW" ] && fatal "'$GIT_DIR_NEW' exists" 54
287         mv -f "$GIT_DIR" "$GIT_DIR_NEW" || fatal "Could not mv '$GIT_DIR' '$GIT_DIR_NEW'" 52
288
289         # Now that the repository has been renamed, we need to fix up its configuration
290         # Overwrite old name..
291         GIT_DIR="$GIT_DIR_NEW"
292         VCSH_REPO_NAME="$VCSH_REPO_NAME_NEW"
293         # ..and clobber all old configuration
294         upgrade
295 }
296
297 run() {
298         hook pre-run
299         use
300         "$@"
301         VCSH_COMMAND_RETURN_CODE=$?
302         hook post-run
303 }
304
305 status() {
306         if [ ! "x$VCSH_REPO_NAME" = "x" ]; then
307                 export GIT_DIR="$VCSH_REPO_D/$VCSH_REPO_NAME.git"
308                 use
309                 git status --short --untracked-files='no'
310                 VCSH_COMMAND_RETURN_CODE=$?
311         else
312                 for VCSH_REPO_NAME in $(list); do
313                         echo "$VCSH_REPO_NAME:"
314                         export GIT_DIR="$VCSH_REPO_D/$VCSH_REPO_NAME.git"
315                         use
316                         git status --short --untracked-files='no'
317                         VCSH_COMMAND_RETURN_CODE=$?
318                         echo
319                 done
320         fi
321 }
322
323 upgrade() {
324         hook pre-upgrade
325         # fake-bare repositories are not bare, actually. Set this to false
326         # because otherwise Git complains "fatal: core.bare and core.worktree
327         # do not make sense"
328         git config core.bare false
329         # core.worktree may be absolute or relative to $GIT_DIR, depending on
330         # user preference
331         if [ ! "x$VCSH_WORKTREE" = 'xabsolute' ]; then
332                 git config core.worktree $(cd $GIT_DIR && GIT_WORK_TREE="$VCSH_BASE" git rev-parse --show-cdup)
333         elif [ ! "x$VCSH_WORKTREE" = 'xrelative' ]; then
334                 git config core.worktree "$VCSH_BASE"
335         fi
336         [ ! "x$VCSH_GITIGNORE" = 'xnone' ] && git config core.excludesfile ".gitignore.d/$VCSH_REPO_NAME"
337         git config core.attributesfile ".gitattributes.d/$VCSH_REPO_NAME"
338         git config vcsh.vcsh 'true'
339         use
340         [ -e "$VCSH_BASE/.gitignore.d/$VCSH_REPO_NAME" ] && git add -f "$VCSH_BASE/.gitignore.d/$VCSH_REPO_NAME"
341         [ -e "$VCSH_BASE/.gitattributes.d/$VCSH_REPO_NAME" ] && git add -f "$VCSH_BASE/.gitattributes.d/$VCSH_REPO_NAME"
342         hook post-upgrade
343 }
344
345 use() {
346         git_dir_exists
347         export VCSH_DIRECTORY="$VCSH_REPO_NAME"
348 }
349
350 which() {
351         for VCSH_REPO_NAME in $(list); do
352                 for VCSH_FILE in $(get_files); do
353                         echo $VCSH_FILE | grep -q "$VCSH_COMMAND_PARAMETER" && echo "$VCSH_REPO_NAME: $VCSH_FILE"
354                 done
355         done | sort -u
356 }
357
358 write_gitignore() {
359         # Don't do anything if the user does not want to write gitignore
360         if [ "x$VCSH_GITIGNORE" = 'xnone' ]; then
361                 info "Not writing gitignore as '\$VCSH_GITIGNORE' is set to 'none'"
362                 exit
363         fi
364
365         use
366         cd "$VCSH_BASE" || fatal "could not enter '$VCSH_BASE'" 11
367         OLDIFS="$IFS"
368         IFS=$(printf '\n\t')
369         gitignores=$(for file in $(git ls-files); do
370                 while true; do
371                         echo $file; new="${file%/*}"
372                         [ "$file" = "$new" ] && break
373                         file="$new"
374                 done;
375         done | sort -u)
376
377         # Contrary to GNU mktemp, mktemp on BSD/OSX requires a template for temp files
378         # Using a template makes GNU mktemp default to $PWD and not #TMPDIR for tempfile location
379         # To make every OS happy, set full path explicitly
380         tempfile=$(mktemp "${TMPDIR:-/tmp}/tmp.XXXXXXXXXX") || fatal "could not create tempfile: '${tempfile}'" 51
381
382         echo '*' > "$tempfile" || fatal "could not write to '$tempfile'" 57
383         for gitignore in $gitignores; do
384                 echo "$gitignore" | sed 's@^@!/@' >> "$tempfile" || fatal "could not write to '$tempfile'" 57
385                 if [ "x$VCSH_GITIGNORE" = 'xrecursive' ] && [ -d "$gitignore" ]; then
386                         { echo "$gitignore/*" | sed 's@^@!/@' >> "$tempfile" || fatal "could not write to '$tempfile'" 57; }
387                 fi
388         done
389         IFS="$OLDIFS"
390         if diff -N "$tempfile" "$VCSH_BASE/.gitignore.d/$VCSH_REPO_NAME" > /dev/null; then
391                 rm -f "$tempfile" || error "could not delete '$tempfile'"
392                 exit
393         fi
394         if [ -e "$VCSH_BASE/.gitignore.d/$VCSH_REPO_NAME" ]; then
395                 info "'$VCSH_BASE/.gitignore.d/$VCSH_REPO_NAME' differs from new data, moving it to '$VCSH_BASE/.gitignore.d/$VCSH_REPO_NAME.bak'"
396                 mv -f "$VCSH_BASE/.gitignore.d/$VCSH_REPO_NAME" "$VCSH_BASE/.gitignore.d/$VCSH_REPO_NAME.bak" ||
397                         fatal "could not move '$VCSH_BASE/.gitignore.d/$VCSH_REPO_NAME' to '$VCSH_BASE/.gitignore.d/$VCSH_REPO_NAME.bak'" 53
398         fi
399         mv -f "$tempfile" "$VCSH_BASE/.gitignore.d/$VCSH_REPO_NAME" ||
400                 fatal "could not move '$tempfile' to '$VCSH_BASE/.gitignore.d/$VCSH_REPO_NAME'" 53
401 }
402
403 debug $(git version)
404
405 if [ ! "x$VCSH_GITIGNORE" = 'xexact' ] && [ ! "x$VCSH_GITIGNORE" = 'xnone' ] && [ ! "x$VCSH_GITIGNORE" = 'xrecursive' ]; then
406         fatal "'\$VCSH_GITIGNORE' must equal 'exact', 'none', or 'recursive'" 1
407 fi
408
409 export VCSH_COMMAND="$1"
410
411 case "$VCSH_COMMAND" in
412         clon|clo|cl) VCSH_COMMAND=clone;;
413         commi|comm|com|co) VCSH_COMMAND=commit;;
414         delet|dele|del|de) VCSH_COMMAND=delete;;
415         ente|ent|en) VCSH_COMMAND=enter;;
416         hel|he) VCSH_COMMAND=help;;
417         ini|in) VCSH_COMMAND=init;;
418         pul) VCSH_COMMAND=pull;;
419         pus) VCSH_COMMAND=push;;
420         renam|rena|ren|re) VCSH_COMMAND=rename;;
421         ru) VCSH_COMMAND=run;;
422         statu|stat|sta|st) VCSH_COMMAND=status;;
423         upgrad|upgra|upgr|up) VCSH_COMMAND=upgrade;;
424         versio|versi|vers|ver|ve) VCSH_COMMAND=version;;
425         which|whi|wh) VCSH_COMMAND=which;;
426         write|writ|wri|wr) VCSH_COMMAND=write-gitignore;;
427 esac    
428
429 if [ "$VCSH_COMMAND" = 'clone' ]; then
430         [ -z "$2" ] && fatal "$VCSH_COMMAND: please specify a remote" 1
431         GIT_REMOTE="$2"
432         [ -n "$3" ] && VCSH_REPO_NAME="$3" || VCSH_REPO_NAME=$(basename "${GIT_REMOTE#*:}" .git)
433         [ -z "$VCSH_REPO_NAME" ] && fatal "$VCSH_COMMAND: could not determine repository name" 1
434         export VCSH_REPO_NAME
435         export GIT_DIR="$VCSH_REPO_D/$VCSH_REPO_NAME.git"
436 elif [ "$VCSH_COMMAND" = 'version' ]; then
437         echo "$SELF $VERSION"
438         git version
439         exit
440 elif [ "$VCSH_COMMAND" = 'which' ]; then
441         [ -z "$2" ] && fatal "$VCSH_COMMAND: please specify a filename" 1
442         [ -n "$3" ] && fatal "$VCSH_COMMAND: too many parameters" 1
443         export VCSH_COMMAND_PARAMETER="$2"
444 elif [ "$VCSH_COMMAND" = 'delete' ]           ||
445      [ "$VCSH_COMMAND" = 'enter' ]            ||
446      [ "$VCSH_COMMAND" = 'init' ]             ||
447      [ "$VCSH_COMMAND" = 'list-tracked-by' ]  ||
448      [ "$VCSH_COMMAND" = 'rename' ]           ||
449      [ "$VCSH_COMMAND" = 'run' ]              ||
450      [ "$VCSH_COMMAND" = 'upgrade' ]          ||
451      [ "$VCSH_COMMAND" = 'write-gitignore' ]; then
452         [ -z $2 ]                                 && fatal "$VCSH_COMMAND: please specify repository to work on" 1
453         [ "$VCSH_COMMAND" = 'rename' -a -z "$3" ] && fatal "$VCSH_COMMAND: please specify a target name" 1
454         [ "$VCSH_COMMAND" = 'run'    -a -z "$3" ] && fatal "$VCSH_COMMAND: please specify a command" 1
455         export VCSH_REPO_NAME="$2"
456         export GIT_DIR="$VCSH_REPO_D/$VCSH_REPO_NAME.git"
457         [ "$VCSH_COMMAND" = 'rename' ] && { export VCSH_REPO_NAME_NEW="$3";
458                                             export GIT_DIR_NEW="$VCSH_REPO_D/$VCSH_REPO_NAME_NEW.git"; }
459         [ "$VCSH_COMMAND" = 'run' ]    && shift 2
460 elif [ "$VCSH_COMMAND" = 'commit' ] ||
461      [ "$VCSH_COMMAND" = 'list' ] ||
462      [ "$VCSH_COMMAND" = 'list-tracked' ] ||
463      [ "$VCSH_COMMAND" = 'pull' ] ||
464      [ "$VCSH_COMMAND" = 'push' ]; then
465         :
466 elif [ "$VCSH_COMMAND" = 'status' ]; then
467         export VCSH_REPO_NAME="$2"
468 elif [ -n "$2" ]; then
469         export VCSH_COMMAND='run'
470         export VCSH_REPO_NAME="$1"
471         export GIT_DIR="$VCSH_REPO_D/$VCSH_REPO_NAME.git"
472         [ -d $GIT_DIR ] || { help; exit 1; }
473         shift 1
474         set -- "git" "$@"
475 elif [ -n "$VCSH_COMMAND" ]; then
476         export VCSH_COMMAND='enter'
477         export VCSH_REPO_NAME="$1"
478         export GIT_DIR="$VCSH_REPO_D/$VCSH_REPO_NAME.git"
479         [ -d $GIT_DIR ] || { help; exit 1; }
480 else
481         # $1 is empty, or 'help'
482         help && exit
483 fi
484
485 # Did we receive a directory instead of a name?
486 # Mangle the input to fit normal operation.
487 if echo $VCSH_REPO_NAME | grep -q '/'; then
488         export GIT_DIR=$VCSH_REPO_NAME
489         export VCSH_REPO_NAME=$(basename "$VCSH_REPO_NAME" .git)
490 fi
491
492 check_dir() {
493         check_directory="$1"
494         if [ ! -d "$check_directory" ]; then
495                 if [ -e "$check_directory" ]; then
496                         fatal "'$check_directory' exists but is not a directory" 13
497                 else
498                         verbose "attempting to create '$check_directory'"
499                         mkdir -p "$check_directory" || fatal "could not create '$check_directory'" 50
500                 fi
501         fi
502 }
503
504 check_dir "$VCSH_REPO_D"
505 [ ! "x$VCSH_GITIGNORE" = 'xnone' ] && check_dir "$VCSH_BASE/.gitignore.d"
506 check_dir "$VCSH_BASE/.gitattributes.d"
507
508 verbose "$VCSH_COMMAND begin"
509 export VCSH_COMMAND=$(echo $VCSH_COMMAND | sed 's/-/_/g')
510 hook pre-command
511 $VCSH_COMMAND "$@"
512 hook post-command
513 verbose "$VCSH_COMMAND end, exiting"
514 exit $VCSH_COMMAND_RETURN_CODE