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  insteadOf = madduck:

add hooks to enable auto handing of merge conflicts
[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 : ${VCSH_HOOK_D:=$XDH_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                 echo
179         done
180         hook post-commit
181 }
182
183 delete() {
184         cd "$VCSH_BASE" || fatal "could not enter '$VCSH_BASE'" 11
185         use
186         info "This operation WILL DESTROY DATA!"
187         files=$(git ls-files)
188         echo "These files will be deleted:
189
190 $files
191
192 AGAIN, THIS WILL DELETE YOUR DATA!
193 To continue, type 'Yes, do as I say'"
194         read answer
195         [ "x$answer" = 'xYes, do as I say' ] || exit 16
196         for file in $files; do
197                 rm -f $file || info "could not delete '$file', continuing with deletion"
198         done
199         rm -rf "$GIT_DIR" || error "could not delete '$GIT_DIR'"
200 }
201
202 enter() {
203         hook pre-enter
204         use
205         $SHELL
206         hook post-enter
207 }
208
209 git_dir_exists() {
210         [ -d "$GIT_DIR" ] || fatal "no repository found for '$VCSH_REPO_NAME'" 12
211 }
212
213 hook() {
214         for hook in $VCSH_HOOK_D/$1* $VCSH_HOOK_D/$VCSH_REPO_NAME.$1*; do
215                 [ -x "$hook" ] || continue
216                 verbose "executing '$hook'"
217                 "$hook"
218         done
219 }
220
221 init() {
222         hook pre-init
223         [ ! -e "$GIT_DIR" ] || fatal "'$GIT_DIR' exists" 10
224         mkdir -p "$VCSH_BASE" || fatal "could not create '$VCSH_BASE'" 50
225         cd "$VCSH_BASE" || fatal "could not enter '$VCSH_BASE'" 11
226         git init
227         upgrade
228         hook post-init
229 }
230
231 list() {
232         for repo in "$VCSH_REPO_D"/*.git; do
233                 [ -d "$repo" ] && [ -r "$repo" ] && echo $(basename "$repo" .git)
234         done
235 }
236
237 get_files() {
238         export GIT_DIR="$VCSH_REPO_D/$VCSH_REPO_NAME.git"
239         git ls-files
240 }
241
242 list_tracked() {
243         for VCSH_REPO_NAME in $(list); do
244                 get_files
245         done | sort -u
246 }
247
248 list_tracked_by() {
249         use
250         git ls-files | sort -u
251 }
252
253 pull() {
254         hook pre-pull
255         for VCSH_REPO_NAME in $(list); do
256                 printf "$VCSH_REPO_NAME: "
257                 export GIT_DIR="$VCSH_REPO_D/$VCSH_REPO_NAME.git"
258                 use
259                 git pull
260                 echo
261         done
262         hook post-pull
263 }
264
265 push() {
266         hook pre-push
267         for VCSH_REPO_NAME in $(list); do
268                 printf "$VCSH_REPO_NAME: "
269                 export GIT_DIR="$VCSH_REPO_D/$VCSH_REPO_NAME.git"
270                 use
271                 git push
272                 echo
273         done
274         hook post-push
275 }
276
277 retire() {
278         unset VCSH_DIRECTORY
279 }
280
281 rename() {
282         git_dir_exists
283         [ -d "$GIT_DIR_NEW" ] && fatal "'$GIT_DIR_NEW' exists" 54
284         mv -f "$GIT_DIR" "$GIT_DIR_NEW" || fatal "Could not mv '$GIT_DIR' '$GIT_DIR_NEW'" 52
285
286         # Now that the repository has been renamed, we need to fix up its configuration
287         # Overwrite old name..
288         GIT_DIR="$GIT_DIR_NEW"
289         VCSH_REPO_NAME="$VCSH_REPO_NAME_NEW"
290         # ..and clobber all old configuration
291         upgrade
292 }
293
294 run() {
295         hook pre-run
296         use
297         "$@"
298         hook post-run
299 }
300
301 status() {
302         if [ ! "x$VCSH_REPO_NAME" = "x" ]; then
303                 export GIT_DIR="$VCSH_REPO_D/$VCSH_REPO_NAME.git"
304                 use
305                 git status --short --untracked-files='no'
306         else
307                 for VCSH_REPO_NAME in $(list); do
308                         echo "$VCSH_REPO_NAME:"
309                         export GIT_DIR="$VCSH_REPO_D/$VCSH_REPO_NAME.git"
310                         use
311                         git status --short --untracked-files='no'
312                         echo
313                 done
314         fi
315 }
316
317 upgrade() {
318         hook pre-upgrade
319         # fake-bare repositories are not bare, actually. Set this to false
320         # because otherwise Git complains "fatal: core.bare and core.worktree
321         # do not make sense"
322         git config core.bare false
323         # core.worktree may be absolute or relative to $GIT_DIR, depending on
324         # user preference
325         if [ ! "x$VCSH_WORKTREE" = 'xabsolute' ]; then
326                 git config core.worktree $(cd $GIT_DIR && GIT_WORK_TREE="$VCSH_BASE" git rev-parse --show-cdup)
327         elif [ ! "x$VCSH_WORKTREE" = 'xrelative' ]; then
328                 git config core.worktree "$VCSH_BASE"
329         fi
330         [ ! "x$VCSH_GITIGNORE" = 'xnone' ] && git config core.excludesfile ".gitignore.d/$VCSH_REPO_NAME"
331         git config vcsh.vcsh         'true'
332         use
333         [ -e "$VCSH_BASE/.gitignore.d/$VCSH_REPO_NAME" ] && git add -f "$VCSH_BASE/.gitignore.d/$VCSH_REPO_NAME"
334         hook post-upgrade
335 }
336
337 use() {
338         git_dir_exists
339         export VCSH_DIRECTORY="$VCSH_REPO_NAME"
340 }
341
342 which() {
343         for VCSH_REPO_NAME in $(list); do
344                 for VCSH_FILE in $(get_files); do
345                         echo $VCSH_FILE | grep -q "$VCSH_COMMAND_PARAMETER" && echo "$VCSH_REPO_NAME: $VCSH_FILE"
346                 done
347         done | sort -u
348 }
349
350 write_gitignore() {
351         # Don't do anything if the user does not want to write gitignore
352         if [ "x$VCSH_GITIGNORE" = 'xnone' ]; then
353                 info "Not writing gitignore as '\$VCSH_GITIGNORE' is set to 'none'"
354                 exit
355         fi
356
357         use
358         cd "$VCSH_BASE" || fatal "could not enter '$VCSH_BASE'" 11
359         gitignores=$(for file in $(git ls-files); do
360                 while true; do
361                         echo $file; new="${file%/*}"
362                         [ "$file" = "$new" ] && break
363                         file="$new"
364                 done;
365         done | sort -u)
366
367         # Contrary to GNU mktemp, mktemp on BSD/OSX requires a template for temp files
368         # Using a template makes GNU mktemp default to $PWD and not #TMPDIR for tempfile location
369         # To make every OS happy, set full path explicitly
370         tempfile=$(mktemp "${TMPDIR:-/tmp}/tmp.XXXXXXXXXX") || fatal "could not create tempfile: '${tempfile}'" 51
371
372         echo '*' > "$tempfile" || fatal "could not write to '$tempfile'" 57
373         for gitignore in $gitignores; do
374                 echo "$gitignore" | sed 's@^@!/@' >> "$tempfile" || fatal "could not write to '$tempfile'" 57
375                 if [ "x$VCSH_GITIGNORE" = 'xrecursive' ] && [ -d "$gitignore" ]; then
376                         { echo "$gitignore/*" | sed 's@^@!/@' >> "$tempfile" || fatal "could not write to '$tempfile'" 57; }
377                 fi
378         done
379         if diff -N "$tempfile" "$VCSH_BASE/.gitignore.d/$VCSH_REPO_NAME" > /dev/null; then
380                 rm -f "$tempfile" || error "could not delete '$tempfile'"
381                 exit
382         fi
383         if [ -e "$VCSH_BASE/.gitignore.d/$VCSH_REPO_NAME" ]; then
384                 info "'$VCSH_BASE/.gitignore.d/$VCSH_REPO_NAME' differs from new data, moving it to '$VCSH_BASE/.gitignore.d/$VCSH_REPO_NAME.bak'"
385                 mv -f "$VCSH_BASE/.gitignore.d/$VCSH_REPO_NAME" "$VCSH_BASE/.gitignore.d/$VCSH_REPO_NAME.bak" ||
386                         fatal "could not move '$VCSH_BASE/.gitignore.d/$VCSH_REPO_NAME' to '$VCSH_BASE/.gitignore.d/$VCSH_REPO_NAME.bak'" 53
387         fi
388         mv -f "$tempfile" "$VCSH_BASE/.gitignore.d/$VCSH_REPO_NAME" ||
389                 fatal "could not move '$tempfile' to '$VCSH_BASE/.gitignore.d/$VCSH_REPO_NAME'" 53
390 }
391
392 debug `git version`
393
394 if [ ! "x$VCSH_GITIGNORE" = 'xexact' ] && [ ! "x$VCSH_GITIGNORE" = 'xnone' ] && [ ! "x$VCSH_GITIGNORE" = 'xrecursive' ]; then
395         fatal "'\$VCSH_GITIGNORE' must equal 'exact', 'none', or 'recursive'" 1
396 fi
397
398 export VCSH_COMMAND="$1"
399
400 case "$VCSH_COMMAND" in
401         clon|clo|cl) VCSH_COMMAND=clone;;
402         commi|comm|com|co) VCSH_COMMAND=commit;;
403         delet|dele|del|de) VCSH_COMMAND=delete;;
404         ente|ent|en) VCSH_COMMAND=enter;;
405         hel|he) VCSH_COMMAND=help;;
406         ini|in) VCSH_COMMAND=init;;
407         pul) VCSH_COMMAND=pull;;
408         pus) VCSH_COMMAND=push;;
409         renam|rena|ren|re) VCSH_COMMAND=rename;;
410         ru) VCSH_COMMAND=run;;
411         statu|stat|sta|st) VCSH_COMMAND=status;;
412         upgrad|upgra|upgr|up) VCSH_COMMAND=upgrade;;
413         versio|versi|vers|ver|ve) VCSH_COMMAND=version;;
414         which|whi|wh) VCSH_COMMAND=which;;
415         write|writ|wri|wr) VCSH_COMMAND=write-gitignore;;
416 esac    
417
418 if [ "$VCSH_COMMAND" = 'clone' ]; then
419         [ -z "$2" ] && fatal "$VCSH_COMMAND: please specify a remote" 1
420         GIT_REMOTE="$2"
421         [ -n "$3" ] && VCSH_REPO_NAME="$3" || VCSH_REPO_NAME=$(basename "${GIT_REMOTE#*:}" .git)
422         [ -z "$VCSH_REPO_NAME" ] && fatal "$VCSH_COMMAND: could not determine repository name" 1
423         export VCSH_REPO_NAME
424         export GIT_DIR="$VCSH_REPO_D/$VCSH_REPO_NAME.git"
425 elif [ "$VCSH_COMMAND" = 'version' ]; then
426         echo "$SELF $VERSION"
427         git version
428         exit
429 elif [ "$VCSH_COMMAND" = 'which' ]; then
430         [ -z "$2" ] && fatal "$VCSH_COMMAND: please specify a filename" 1
431         [ -n "$3" ] && fatal "$VCSH_COMMAND: too many parameters" 1
432         export VCSH_COMMAND_PARAMETER="$2"
433 elif [ "$VCSH_COMMAND" = 'delete' ]           ||
434      [ "$VCSH_COMMAND" = 'enter' ]            ||
435      [ "$VCSH_COMMAND" = 'init' ]             ||
436      [ "$VCSH_COMMAND" = 'list-tracked-by' ]  ||
437      [ "$VCSH_COMMAND" = 'rename' ]           ||
438      [ "$VCSH_COMMAND" = 'run' ]              ||
439      [ "$VCSH_COMMAND" = 'upgrade' ]          ||
440      [ "$VCSH_COMMAND" = 'write-gitignore' ]; then
441         [ -z $2 ]                                 && fatal "$VCSH_COMMAND: please specify repository to work on" 1
442         [ "$VCSH_COMMAND" = 'rename' -a -z "$3" ] && fatal "$VCSH_COMMAND: please specify a target name" 1
443         [ "$VCSH_COMMAND" = 'run'    -a -z "$3" ] && fatal "$VCSH_COMMAND: please specify a command" 1
444         export VCSH_REPO_NAME="$2"
445         export GIT_DIR="$VCSH_REPO_D/$VCSH_REPO_NAME.git"
446         [ "$VCSH_COMMAND" = 'rename' ] && { export VCSH_REPO_NAME_NEW="$3";
447                                             export GIT_DIR_NEW="$VCSH_REPO_D/$VCSH_REPO_NAME_NEW.git"; }
448         [ "$VCSH_COMMAND" = 'run' ]    && shift 2
449 elif [ "$VCSH_COMMAND" = 'commit' ] ||
450      [ "$VCSH_COMMAND" = 'list' ] ||
451      [ "$VCSH_COMMAND" = 'list-tracked' ] ||
452      [ "$VCSH_COMMAND" = 'pull' ] ||
453      [ "$VCSH_COMMAND" = 'push' ]; then
454         :
455 elif [ "$VCSH_COMMAND" = 'status' ]; then
456         export VCSH_REPO_NAME="$2"
457 elif [ -n "$2" ]; then
458         export VCSH_COMMAND='run'
459         export VCSH_REPO_NAME="$1"
460         export GIT_DIR="$VCSH_REPO_D/$VCSH_REPO_NAME.git"
461         [ -d $GIT_DIR ] || { help; exit 1; }
462         shift 1
463         set -- "git" "$@"
464 elif [ -n "$VCSH_COMMAND" ]; then
465         export VCSH_COMMAND='enter'
466         export VCSH_REPO_NAME="$1"
467         export GIT_DIR="$VCSH_REPO_D/$VCSH_REPO_NAME.git"
468         [ -d $GIT_DIR ] || { help; exit 1; }
469 else
470         # $1 is empty, or 'help'
471         help && exit
472 fi
473
474 # Did we receive a directory instead of a name?
475 # Mangle the input to fit normal operation.
476 if echo $VCSH_REPO_NAME | grep -q '/'; then
477         export GIT_DIR=$VCSH_REPO_NAME
478         export VCSH_REPO_NAME=$(basename "$VCSH_REPO_NAME" .git)
479 fi
480
481 check_dir() {
482         check_directory="$1"
483         if [ ! -d "$check_directory" ]; then
484                 if [ -e "$check_directory" ]; then
485                         fatal "'$check_directory' exists but is not a directory" 13
486                 else
487                         verbose "attempting to create '$check_directory'"
488                         mkdir -p "$check_directory" || fatal "could not create '$check_directory'" 50
489                 fi
490         fi
491 }
492
493 check_dir "$VCSH_REPO_D"
494 [ ! "x$VCSH_GITIGNORE" = 'xnone' ] && check_dir "$VCSH_BASE/.gitignore.d"
495
496 verbose "$VCSH_COMMAND begin"
497 export VCSH_COMMAND=$(echo $VCSH_COMMAND | sed 's/-/_/g')
498 hook pre-command
499 $VCSH_COMMAND "$@"
500 hook post-command
501 verbose "$VCSH_COMMAND end, exiting"