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vcsh: Initial support for cloning from branches other than master
[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>, 2011-2014
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 "$VCSH_DEBUG" ] && set -vx
17
18
19 # If '.git-HEAD' is appended to the version, you are seeing an unreleased
20 # version of vcsh; the master branch is supposed to be clean at all times
21 # so you can most likely just use it nonetheless
22 VERSION='1.20140508'
23 SELF=$(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 [ x"$1" = x'-d' ] || [ x"$1" = x'--debug' ]; then
35                 set -vx
36                 VCSH_DEBUG=1
37                 echo "debug mode on"
38                 echo "$SELF $VERSION"
39         elif [ x"$1" = x'-v' ]; then
40                 VCSH_VERBOSE=1
41                 echo "verbose mode on"
42                 echo "$SELF $VERSION"
43         elif [ x"$1" = x'-c' ]; then
44                 VCSH_OPTION_CONFIG=$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_GITATTRIBUTES:=none}
81 : ${VCSH_WORKTREE:=absolute}
82
83 if [ ! "x$VCSH_GITIGNORE" = 'xexact' ] && [ ! "x$VCSH_GITIGNORE" = 'xnone' ] && [ ! "x$VCSH_GITIGNORE" = 'xrecursive' ]; then
84         fatal "'\$VCSH_GITIGNORE' must equal 'exact', 'none', or 'recursive'" 1
85 fi
86
87 if [ ! "x$VCSH_WORKTREE" = 'xabsolute' ] && [ ! "x$VCSH_WORKTREE" = 'xrelative' ]; then
88         fatal "'\$VCSH_WORKTREE' must equal 'absolute', or 'relative'" 1
89 fi
90
91
92 help() {
93         echo "usage: $SELF <options> <command>
94
95    options:
96    -c <file>            Source file
97    -d                   Enable debug mode
98    -v                   Enable verbose mode
99
100    commands:
101    clone <remote> \\
102          [<repo>]       Clone from an existing repository
103    commit               Commit in all repositories
104    delete <repo>        Delete an existing repository
105    enter <repo>         Enter repository; spawn new instance of \$SHELL
106    help                 Display this help text
107    init <repo>          Initialize a new repository
108    list                 List all repositories
109    list-tracked         List all files tracked by vcsh
110    list-tracked-by \\
111         <repo>          List files tracked by a repository
112    pull                 Pull from all vcsh remotes
113    push                 Push to vcsh remotes
114    rename <repo> \\
115           <newname>     Rename repository
116    run <repo> \\
117        <command>        Use this repository
118    status [<repo>]      Show statuses of all/one vcsh repositories
119    upgrade <repo>       Upgrade repository to currently recommended settings
120    version              Print version information
121    which <substring>    Find substring in name of any tracked file
122    write-gitignore \\
123    <repo>               Write .gitignore.d/<repo> via git ls-files
124
125    <repo> <git command> Shortcut to run git commands directly
126    <repo>               Shortcut to enter repository" >&2
127 }
128
129 debug() {
130         [ -n "$VCSH_DEBUG" ] && echo "$SELF: debug: $@"
131 }
132
133 verbose() {
134         if [ -n "$VCSH_DEBUG" ] || [ -n "$VCSH_VERBOSE" ]; then echo "$SELF: verbose: $@"; fi
135 }
136
137 error() {
138         echo "$SELF: error: $1" >&2
139 }
140
141 info() {
142         echo "$SELF: info: $1"
143 }
144
145 clone() {
146         hook pre-clone
147         init
148         git remote add origin "$GIT_REMOTE"
149         git config branch."$VCSH_BRANCH".remote origin
150         git config branch."$VCSH_BRANCH".merge  refs/heads/$VCSH_BRANCH
151         if [ $(git ls-remote origin $VCSH_BRANCH 2> /dev/null | wc -l ) -lt 1 ]; then
152                 info "remote is empty, not merging anything"
153                 exit
154         fi
155         git fetch
156         hook pre-merge
157         git ls-tree -r --name-only origin/master | (while read object; do
158                 [ -e "$object" ] &&
159                         error "'$object' exists." &&
160                         VCSH_CONFLICT=1
161         done
162         [ x"$VCSH_CONFLICT" = x'1' ]) &&
163                 fatal "will stop after fetching and not try to merge!
164   Once this situation has been resolved, run 'vcsh $VCSH_REPO_NAME pull' to finish cloning." 17
165         git merge origin/master # XXX
166         hook post-merge
167         hook post-clone
168         retire
169         hook post-clone-retired
170 }
171
172 commit() {
173         hook pre-commit
174         for VCSH_REPO_NAME in $(list); do
175                 echo "$VCSH_REPO_NAME: "
176                 GIT_DIR=$VCSH_REPO_D/$VCSH_REPO_NAME.git; export GIT_DIR
177                 use
178                 git commit --untracked-files=no --quiet
179                 VCSH_COMMAND_RETURN_CODE=$?
180                 echo
181         done
182         hook post-commit
183 }
184
185 delete() {
186         cd "$VCSH_BASE" || fatal "could not enter '$VCSH_BASE'" 11
187         use
188         info "This operation WILL DESTROY DATA!"
189         files=$(git ls-files)
190         echo "These files will be deleted:
191
192 $files
193
194 AGAIN, THIS WILL DELETE YOUR DATA!
195 To continue, type 'Yes, do as I say'"
196         read answer
197         [ "x$answer" = 'xYes, do as I say' ] || exit 16
198         for file in $files; do
199                 rm -f $file || info "could not delete '$file', continuing with deletion"
200         done
201         rm -rf "$GIT_DIR" || error "could not delete '$GIT_DIR'"
202 }
203
204 enter() {
205         hook pre-enter
206         use
207         $SHELL
208         hook post-enter
209 }
210
211 git_dir_exists() {
212         [ -d "$GIT_DIR" ] || fatal "no repository found for '$VCSH_REPO_NAME'" 12
213 }
214
215 hook() {
216         for hook in "$VCSH_HOOK_D/$1"* "$VCSH_HOOK_D/$VCSH_REPO_NAME.$1"*; do
217                 [ -x "$hook" ] || continue
218                 verbose "executing '$hook'"
219                 "$hook"
220         done
221 }
222
223 init() {
224         hook pre-init
225         [ ! -e "$GIT_DIR" ] || fatal "'$GIT_DIR' exists" 10
226         mkdir -p "$VCSH_BASE" || fatal "could not create '$VCSH_BASE'" 50
227         cd "$VCSH_BASE" || fatal "could not enter '$VCSH_BASE'" 11
228         git init --shared=0600
229         upgrade
230         hook post-init
231 }
232
233 list() {
234         for repo in "$VCSH_REPO_D"/*.git; do
235                 [ -d "$repo" ] && [ -r "$repo" ] && echo "$(basename "$repo" .git)"
236         done
237 }
238
239 get_files() {
240         GIT_DIR=$VCSH_REPO_D/$VCSH_REPO_NAME.git; export GIT_DIR
241         git ls-files
242 }
243
244 list_tracked() {
245         for VCSH_REPO_NAME in $(list); do
246                 get_files
247         done | sed "s,^,$(printf '%s\n' "$VCSH_BASE/" | \
248             sed 's/[,\&]/\\&/g')," | sort -u
249 }
250
251 list_tracked_by() {
252         use
253         git ls-files | sed "s,^,$(printf '%s\n' "$VCSH_BASE/" | \
254             sed 's/[,\&]/\\&/g')," | sort -u
255 }
256
257 pull() {
258         hook pre-pull
259         for VCSH_REPO_NAME in $(list); do
260                 printf '%s: ' "$VCSH_REPO_NAME"
261                 GIT_DIR=$VCSH_REPO_D/$VCSH_REPO_NAME.git; export GIT_DIR
262                 use
263                 git pull
264                 VCSH_COMMAND_RETURN_CODE=$?
265                 echo
266         done
267         hook post-pull
268 }
269
270 push() {
271         hook pre-push
272         for VCSH_REPO_NAME in $(list); do
273                 printf '%s: ' "$VCSH_REPO_NAME"
274                 GIT_DIR=$VCSH_REPO_D/$VCSH_REPO_NAME.git; export GIT_DIR
275                 use
276                 git push
277                 VCSH_COMMAND_RETURN_CODE=$?
278                 echo
279         done
280         hook post-push
281 }
282
283 retire() {
284         unset VCSH_DIRECTORY
285 }
286
287 rename() {
288         git_dir_exists
289         [ -d "$GIT_DIR_NEW" ] && fatal "'$GIT_DIR_NEW' exists" 54
290         mv -f "$GIT_DIR" "$GIT_DIR_NEW" || fatal "Could not mv '$GIT_DIR' '$GIT_DIR_NEW'" 52
291
292         # Now that the repository has been renamed, we need to fix up its configuration
293         # Overwrite old name..
294         GIT_DIR=$GIT_DIR_NEW
295         VCSH_REPO_NAME=$VCSH_REPO_NAME_NEW
296         # ..and clobber all old configuration
297         upgrade
298 }
299
300 run() {
301         hook pre-run
302         use
303         "$@"
304         VCSH_COMMAND_RETURN_CODE=$?
305         hook post-run
306 }
307
308 status() {
309         if [ -n "$VCSH_REPO_NAME" ]; then
310                 GIT_DIR=$VCSH_REPO_D/$VCSH_REPO_NAME.git; export GIT_DIR
311                 use
312                 git status --short --untracked-files='no'
313                 VCSH_COMMAND_RETURN_CODE=$?
314         else
315                 for VCSH_REPO_NAME in $(list); do
316                         echo "$VCSH_REPO_NAME:"
317                         GIT_DIR=$VCSH_REPO_D/$VCSH_REPO_NAME.git; export GIT_DIR
318                         use
319                         git status --short --untracked-files='no'
320                         VCSH_COMMAND_RETURN_CODE=$?
321                         echo
322                 done
323         fi
324 }
325
326 upgrade() {
327         hook pre-upgrade
328         # fake-bare repositories are not bare, actually. Set this to false
329         # because otherwise Git complains "fatal: core.bare and core.worktree
330         # do not make sense"
331         git config core.bare false
332         # core.worktree may be absolute or relative to $GIT_DIR, depending on
333         # user preference
334         if [ ! "x$VCSH_WORKTREE" = 'xabsolute' ]; then
335                 git config core.worktree "$(cd "$GIT_DIR" && GIT_WORK_TREE=$VCSH_BASE git rev-parse --show-cdup)"
336         elif [ ! "x$VCSH_WORKTREE" = 'xrelative' ]; then
337                 git config core.worktree "$VCSH_BASE"
338         fi
339         [ ! "x$VCSH_GITIGNORE" = 'xnone' ] && git config core.excludesfile ".gitignore.d/$VCSH_REPO_NAME"
340         [ ! "x$VCSH_GITATTRIBUTES" = 'xnone' ] && git config core.attributesfile ".gitattributes.d/$VCSH_REPO_NAME"
341         git config vcsh.vcsh 'true'
342         use
343         [ -e "$VCSH_BASE/.gitignore.d/$VCSH_REPO_NAME" ] && git add -f "$VCSH_BASE/.gitignore.d/$VCSH_REPO_NAME"
344         [ -e "$VCSH_BASE/.gitattributes.d/$VCSH_REPO_NAME" ] && git add -f "$VCSH_BASE/.gitattributes.d/$VCSH_REPO_NAME"
345         hook post-upgrade
346 }
347
348 use() {
349         git_dir_exists
350         VCSH_DIRECTORY=$VCSH_REPO_NAME; export VCSH_DIRECTORY
351 }
352
353 which() {
354         for VCSH_REPO_NAME in $(list); do
355                 for VCSH_FILE in $(get_files); do
356                         echo "$VCSH_FILE" | grep -q "$VCSH_COMMAND_PARAMETER" && echo "$VCSH_REPO_NAME: $VCSH_FILE"
357                 done
358         done | sort -u
359 }
360
361 write_gitignore() {
362         # Don't do anything if the user does not want to write gitignore
363         if [ "x$VCSH_GITIGNORE" = 'xnone' ]; then
364                 info "Not writing gitignore as '\$VCSH_GITIGNORE' is set to 'none'"
365                 exit
366         fi
367
368         use
369         cd "$VCSH_BASE" || fatal "could not enter '$VCSH_BASE'" 11
370         OLDIFS=$IFS
371         IFS=$(printf '\n\t')
372         gitignores=$(for file in $(git ls-files); do
373                 while true; do
374                         echo "$file"; new=${file%/*}
375                         [ x"$file" = x"$new" ] && break
376                         file=$new
377                 done;
378         done | sort -u)
379
380         # Contrary to GNU mktemp, mktemp on BSD/OSX requires a template for temp files
381         # Using a template makes GNU mktemp default to $PWD and not #TMPDIR for tempfile location
382         # To make every OS happy, set full path explicitly
383         tempfile=$(mktemp "${TMPDIR:-/tmp}/tmp.XXXXXXXXXX") || fatal "could not create tempfile: '${tempfile}'" 51
384
385         echo '*' > "$tempfile" || fatal "could not write to '$tempfile'" 57
386         for gitignore in $gitignores; do
387                 echo "$gitignore" | sed 's@^@!/@' >> "$tempfile" || fatal "could not write to '$tempfile'" 57
388                 if [ "x$VCSH_GITIGNORE" = 'xrecursive' ] && [ -d "$gitignore" ]; then
389                         { echo "$gitignore/*" | sed 's@^@!/@' >> "$tempfile" || fatal "could not write to '$tempfile'" 57; }
390                 fi
391         done
392         IFS=$OLDIFS
393         if diff -N "$tempfile" "$VCSH_BASE/.gitignore.d/$VCSH_REPO_NAME" > /dev/null; then
394                 rm -f "$tempfile" || error "could not delete '$tempfile'"
395                 exit
396         fi
397         if [ -e "$VCSH_BASE/.gitignore.d/$VCSH_REPO_NAME" ]; then
398                 info "'$VCSH_BASE/.gitignore.d/$VCSH_REPO_NAME' differs from new data, moving it to '$VCSH_BASE/.gitignore.d/$VCSH_REPO_NAME.bak'"
399                 mv -f "$VCSH_BASE/.gitignore.d/$VCSH_REPO_NAME" "$VCSH_BASE/.gitignore.d/$VCSH_REPO_NAME.bak" ||
400                         fatal "could not move '$VCSH_BASE/.gitignore.d/$VCSH_REPO_NAME' to '$VCSH_BASE/.gitignore.d/$VCSH_REPO_NAME.bak'" 53
401         fi
402         mv -f "$tempfile" "$VCSH_BASE/.gitignore.d/$VCSH_REPO_NAME" ||
403                 fatal "could not move '$tempfile' to '$VCSH_BASE/.gitignore.d/$VCSH_REPO_NAME'" 53
404 }
405
406 debug $(git version)
407
408 if [ ! "x$VCSH_GITIGNORE" = 'xexact' ] && [ ! "x$VCSH_GITIGNORE" = 'xnone' ] && [ ! "x$VCSH_GITIGNORE" = 'xrecursive' ]; then
409         fatal "'\$VCSH_GITIGNORE' must equal 'exact', 'none', or 'recursive'" 1
410 fi
411
412 VCSH_COMMAND=$1; export VCSH_COMMAND
413
414 case $VCSH_COMMAND in
415         clon|clo|cl) VCSH_COMMAND=clone;;
416         commi|comm|com|co) VCSH_COMMAND=commit;;
417         delet|dele|del|de) VCSH_COMMAND=delete;;
418         ente|ent|en) VCSH_COMMAND=enter;;
419         hel|he) VCSH_COMMAND=help;;
420         ini|in) VCSH_COMMAND=init;;
421         pul) VCSH_COMMAND=pull;;
422         pus) VCSH_COMMAND=push;;
423         renam|rena|ren|re) VCSH_COMMAND=rename;;
424         ru) VCSH_COMMAND=run;;
425         statu|stat|sta|st) VCSH_COMMAND=status;;
426         upgrad|upgra|upgr|up) VCSH_COMMAND=upgrade;;
427         versio|versi|vers|ver|ve) VCSH_COMMAND=version;;
428         which|whi|wh) VCSH_COMMAND=which;;
429         write|writ|wri|wr) VCSH_COMMAND=write-gitignore;;
430 esac    
431
432 if [ x"$VCSH_COMMAND" = x'clone' ]; then
433         [ -z "$2" ] && fatal "$VCSH_COMMAND: please specify a remote" 1
434         GIT_REMOTE="$2"
435         [ -n "$3" ] && VCSH_REPO_NAME=$3 || VCSH_REPO_NAME=$(basename "${GIT_REMOTE#*:}" .git)
436         [ -z "$VCSH_REPO_NAME" ] && fatal "$VCSH_COMMAND: could not determine repository name" 1
437         export VCSH_REPO_NAME
438         GIT_DIR=$VCSH_REPO_D/$VCSH_REPO_NAME.git; export GIT_DIR
439 elif [ "$VCSH_COMMAND" = 'version' ]; then
440         echo "$SELF $VERSION"
441         git version
442         exit
443 elif [ x"$VCSH_COMMAND" = x'which' ]; then
444         [ -z "$2" ] && fatal "$VCSH_COMMAND: please specify a filename" 1
445         [ -n "$3" ] && fatal "$VCSH_COMMAND: too many parameters" 1
446         VCSH_COMMAND_PARAMETER=$2; export VCSH_COMMAND_PARAMETER
447 elif [ x"$VCSH_COMMAND" = x'delete' ]           ||
448      [ x"$VCSH_COMMAND" = x'enter' ]            ||
449      [ x"$VCSH_COMMAND" = x'init' ]             ||
450      [ x"$VCSH_COMMAND" = x'list-tracked-by' ]  ||
451      [ x"$VCSH_COMMAND" = x'rename' ]           ||
452      [ x"$VCSH_COMMAND" = x'run' ]              ||
453      [ x"$VCSH_COMMAND" = x'upgrade' ]          ||
454      [ x"$VCSH_COMMAND" = x'write-gitignore' ]; then
455         [ -z "$2" ]                                     && fatal "$VCSH_COMMAND: please specify repository to work on" 1
456         [ x"$VCSH_COMMAND" = x'rename' ] && [ -z "$3" ] && fatal "$VCSH_COMMAND: please specify a target name" 1
457         [ x"$VCSH_COMMAND" = x'run'    ] && [ -z "$3" ] && fatal "$VCSH_COMMAND: please specify a command" 1
458         VCSH_REPO_NAME=$2; export VCSH_REPO_NAME
459         GIT_DIR=$VCSH_REPO_D/$VCSH_REPO_NAME.git; export GIT_DIR
460         [ x"$VCSH_COMMAND" = x'rename' ] && { VCSH_REPO_NAME_NEW=$3; export VCSH_REPO_NAME_NEW;
461                                               GIT_DIR_NEW=$VCSH_REPO_D/$VCSH_REPO_NAME_NEW.git; export GIT_DIR_NEW; }
462         [ x"$VCSH_COMMAND" = x'run' ]    && shift 2
463 elif [ x"$VCSH_COMMAND" = x'commit' ] ||
464      [ x"$VCSH_COMMAND" = x'list'   ] ||
465      [ x"$VCSH_COMMAND" = x'list-tracked' ] ||
466      [ x"$VCSH_COMMAND" = x'pull'   ] ||
467      [ x"$VCSH_COMMAND" = x'push'   ]; then
468         :
469 elif [ x"$VCSH_COMMAND" = x'status' ]; then
470         VCSH_REPO_NAME=$2; export VCSH_REPO_NAME
471 elif [ -n "$2" ]; then
472         VCSH_COMMAND='run'; export VCSH_COMMAND
473         VCSH_REPO_NAME=$1; export VCSH_REPO_NAME
474         GIT_DIR=$VCSH_REPO_D/$VCSH_REPO_NAME.git; export GIT_DIR
475         [ -d "$GIT_DIR" ] || { help; exit 1; }
476         shift 1
477         set -- "git" "$@"
478 elif [ -n "$VCSH_COMMAND" ]; then
479         VCSH_COMMAND='enter'; export VCSH_COMMAND
480         VCSH_REPO_NAME=$1; export VCSH_REPO_NAME
481         GIT_DIR=$VCSH_REPO_D/$VCSH_REPO_NAME.git; export GIT_DIR
482         [ -d "$GIT_DIR" ] || { help; exit 1; }
483 else
484         # $1 is empty, or 'help'
485         help && exit
486 fi
487
488 # Did we receive a directory instead of a name?
489 # Mangle the input to fit normal operation.
490 if echo "$VCSH_REPO_NAME" | grep -q '/'; then
491         GIT_DIR=$VCSH_REPO_NAME; export GIT_DIR
492         VCSH_REPO_NAME=$(basename "$VCSH_REPO_NAME" .git); export VCSH_REPO_NAME
493 fi
494
495 check_dir() {
496         check_directory="$1"
497         if [ ! -d "$check_directory" ]; then
498                 if [ -e "$check_directory" ]; then
499                         fatal "'$check_directory' exists but is not a directory" 13
500                 else
501                         verbose "attempting to create '$check_directory'"
502                         mkdir -p "$check_directory" || fatal "could not create '$check_directory'" 50
503                 fi
504         fi
505 }
506
507 check_dir "$VCSH_REPO_D"
508 [ ! "x$VCSH_GITIGNORE" = 'xnone' ] && check_dir "$VCSH_BASE/.gitignore.d"
509 [ ! "x$VCSH_GITATTRIBUTES" = 'xnone' ] && check_dir "$VCSH_BASE/.gitattributes.d"
510
511 verbose "$VCSH_COMMAND begin"
512 VCSH_COMMAND=$(echo "$VCSH_COMMAND" | sed 's/-/_/g'); export VCSH_COMMAND
513 hook pre-command
514 $VCSH_COMMAND "$@"
515 hook post-command
516 verbose "$VCSH_COMMAND end, exiting"
517 exit $VCSH_COMMAND_RETURN_CODE