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Revision 1.22 - (show annotations) (download)
Wed Oct 30 19:21:12 2013 UTC (10 months, 3 weeks ago) by mgorny
Branch: MAIN
Changes since 1.21: +18 -2 lines
Fix parallel checkout race conditions, bug #489280.

1 # Copyright 1999-2013 Gentoo Foundation
2 # Distributed under the terms of the GNU General Public License v2
3 # $Header: /var/cvsroot/gentoo-x86/eclass/git-r3.eclass,v 1.21 2013/10/27 13:44:35 mgorny Exp $
4
5 # @ECLASS: git-r3.eclass
6 # @MAINTAINER:
7 # Michał Górny <mgorny@gentoo.org>
8 # @BLURB: Eclass for fetching and unpacking git repositories.
9 # @DESCRIPTION:
10 # Third generation eclass for easing maitenance of live ebuilds using
11 # git as remote repository. The eclass supports lightweight (shallow)
12 # clones and bare clones of submodules.
13
14 case "${EAPI:-0}" in
15 0|1|2|3|4|5)
16 ;;
17 *)
18 die "Unsupported EAPI=${EAPI} (unknown) for ${ECLASS}"
19 ;;
20 esac
21
22 if [[ ! ${_GIT_R3} ]]; then
23
24 inherit eutils
25
26 fi
27
28 EXPORT_FUNCTIONS src_unpack
29
30 if [[ ! ${_GIT_R3} ]]; then
31
32 if [[ ! ${_INHERITED_BY_GIT_2} ]]; then
33 DEPEND=">=dev-vcs/git-1.8.2.1"
34 fi
35
36 # @ECLASS-VARIABLE: EGIT3_STORE_DIR
37 # @DESCRIPTION:
38 # Storage directory for git sources.
39 #
40 # EGIT3_STORE_DIR=${DISTDIR}/git3-src
41
42 # @ECLASS-VARIABLE: EGIT_REPO_URI
43 # @REQUIRED
44 # @DESCRIPTION:
45 # URIs to the repository, e.g. git://foo, https://foo. If multiple URIs
46 # are provided, the eclass will consider them as fallback URIs to try
47 # if the first URI does not work.
48 #
49 # It can be overriden via env using ${PN}_LIVE_REPO variable.
50 #
51 # Can be a whitespace-separated list or an array.
52 #
53 # Example:
54 # @CODE
55 # EGIT_REPO_URI="git://a/b.git https://c/d.git"
56 # @CODE
57
58 # @ECLASS-VARIABLE: EVCS_OFFLINE
59 # @DEFAULT_UNSET
60 # @DESCRIPTION:
61 # If non-empty, this variable prevents any online operations.
62
63 # @ECLASS-VARIABLE: EGIT_BRANCH
64 # @DEFAULT_UNSET
65 # @DESCRIPTION:
66 # The branch name to check out. If unset, the upstream default (HEAD)
67 # will be used.
68 #
69 # It can be overriden via env using ${PN}_LIVE_BRANCH variable.
70
71 # @ECLASS-VARIABLE: EGIT_COMMIT
72 # @DEFAULT_UNSET
73 # @DESCRIPTION:
74 # The tag name or commit identifier to check out. If unset, newest
75 # commit from the branch will be used. If set, EGIT_BRANCH will
76 # be ignored.
77 #
78 # It can be overriden via env using ${PN}_LIVE_COMMIT variable.
79
80 # @ECLASS-VARIABLE: EGIT_CHECKOUT_DIR
81 # @DESCRIPTION:
82 # The directory to check the git sources out to.
83 #
84 # EGIT_CHECKOUT_DIR=${WORKDIR}/${P}
85
86 # @ECLASS-VARIABLE: EGIT_NONSHALLOW
87 # @DEFAULT_UNSET
88 # @DESCRIPTION:
89 # Disable performing shallow fetches/clones. Shallow clones have
90 # a fair number of limitations. Therefore, if you'd like the eclass to
91 # perform complete clones instead, set this to a non-null value.
92 #
93 # This variable can be set in make.conf and ebuilds. The make.conf
94 # value specifies user-specific default, while ebuilds may use it
95 # to force deep clones when the server does not support shallow clones
96 # (e.g. Google Code).
97
98 # @FUNCTION: _git-r3_env_setup
99 # @INTERNAL
100 # @DESCRIPTION:
101 # Set the eclass variables as necessary for operation. This can involve
102 # setting EGIT_* to defaults or ${PN}_LIVE_* variables.
103 _git-r3_env_setup() {
104 debug-print-function ${FUNCNAME} "$@"
105
106 local esc_pn livevar
107 esc_pn=${PN//[-+]/_}
108
109 livevar=${esc_pn}_LIVE_REPO
110 EGIT_REPO_URI=${!livevar:-${EGIT_REPO_URI}}
111 [[ ${!livevar} ]] \
112 && ewarn "Using ${livevar}, no support will be provided"
113
114 livevar=${esc_pn}_LIVE_BRANCH
115 EGIT_BRANCH=${!livevar:-${EGIT_BRANCH}}
116 [[ ${!livevar} ]] \
117 && ewarn "Using ${livevar}, no support will be provided"
118
119 livevar=${esc_pn}_LIVE_COMMIT
120 EGIT_COMMIT=${!livevar:-${EGIT_COMMIT}}
121 [[ ${!livevar} ]] \
122 && ewarn "Using ${livevar}, no support will be provided"
123
124 # Migration helpers. Remove them when git-2 is removed.
125
126 if [[ ${EGIT_SOURCEDIR} ]]; then
127 eerror "EGIT_SOURCEDIR has been replaced by EGIT_CHECKOUT_DIR. While updating"
128 eerror "your ebuild, please check whether the variable is necessary at all"
129 eerror "since the default has been changed from \${S} to \${WORKDIR}/\${P}."
130 eerror "Therefore, proper setting of S may be sufficient."
131 die "EGIT_SOURCEDIR has been replaced by EGIT_CHECKOUT_DIR."
132 fi
133
134 if [[ ${EGIT_MASTER} ]]; then
135 eerror "EGIT_MASTER has been removed. Instead, the upstream default (HEAD)"
136 eerror "is used by the eclass. Please remove the assignment or use EGIT_BRANCH"
137 eerror "as necessary."
138 die "EGIT_MASTER has been removed."
139 fi
140
141 if [[ ${EGIT_HAS_SUBMODULES} ]]; then
142 eerror "EGIT_HAS_SUBMODULES has been removed. The eclass no longer needs"
143 eerror "to switch the clone type in order to support submodules and therefore"
144 eerror "submodules are detected and fetched automatically."
145 die "EGIT_HAS_SUBMODULES is no longer necessary."
146 fi
147
148 if [[ ${EGIT_PROJECT} ]]; then
149 eerror "EGIT_PROJECT has been removed. Instead, the eclass determines"
150 eerror "the local clone path using path in canonical EGIT_REPO_URI."
151 eerror "If the current algorithm causes issues for you, please report a bug."
152 die "EGIT_PROJECT is no longer necessary."
153 fi
154
155 if [[ ${EGIT_BOOTSTRAP} ]]; then
156 eerror "EGIT_BOOTSTRAP has been removed. Please create proper src_prepare()"
157 eerror "instead."
158 die "EGIT_BOOTSTRAP has been removed."
159 fi
160
161 if [[ ${EGIT_NOUNPACK} ]]; then
162 eerror "EGIT_NOUNPACK has been removed. The eclass no longer calls default"
163 eerror "unpack function. If necessary, please declare proper src_unpack()."
164 die "EGIT_NOUNPACK has been removed."
165 fi
166 }
167
168 # @FUNCTION: _git-r3_set_gitdir
169 # @USAGE: <repo-uri>
170 # @INTERNAL
171 # @DESCRIPTION:
172 # Obtain the local repository path and set it as GIT_DIR. Creates
173 # a new repository if necessary.
174 #
175 # <repo-uri> may be used to compose the path. It should therefore be
176 # a canonical URI to the repository.
177 _git-r3_set_gitdir() {
178 debug-print-function ${FUNCNAME} "$@"
179
180 local repo_name=${1#*://*/}
181
182 # strip the trailing slash
183 repo_name=${repo_name%/}
184
185 # strip common prefixes to make paths more likely to match
186 # e.g. git://X/Y.git vs https://X/git/Y.git
187 # (but just one of the prefixes)
188 case "${repo_name}" in
189 # gnome.org... who else?
190 browse/*) repo_name=${repo_name#browse/};;
191 # cgit can proxy requests to git
192 cgit/*) repo_name=${repo_name#cgit/};;
193 # pretty common
194 git/*) repo_name=${repo_name#git/};;
195 # gentoo.org
196 gitroot/*) repo_name=${repo_name#gitroot/};;
197 # google code, sourceforge
198 p/*) repo_name=${repo_name#p/};;
199 # kernel.org
200 pub/scm/*) repo_name=${repo_name#pub/scm/};;
201 esac
202 # ensure a .git suffix, same reason
203 repo_name=${repo_name%.git}.git
204 # now replace all the slashes
205 repo_name=${repo_name//\//_}
206
207 local distdir=${PORTAGE_ACTUAL_DISTDIR:-${DISTDIR}}
208 : ${EGIT3_STORE_DIR:=${distdir}/git3-src}
209
210 GIT_DIR=${EGIT3_STORE_DIR}/${repo_name}
211
212 if [[ ! -d ${EGIT3_STORE_DIR} ]]; then
213 (
214 addwrite /
215 mkdir -m0755 -p "${EGIT3_STORE_DIR}" || die
216 ) || die "Unable to create ${EGIT3_STORE_DIR}"
217 fi
218
219 addwrite "${EGIT3_STORE_DIR}"
220 if [[ ! -d ${GIT_DIR} ]]; then
221 mkdir "${GIT_DIR}" || die
222 git init --bare || die
223
224 if [[ ! ${EGIT_NONSHALLOW} ]]; then
225 # avoid auto-unshallow :)
226 touch "${GIT_DIR}"/shallow || die
227 fi
228 fi
229 }
230
231 # @FUNCTION: _git-r3_set_submodules
232 # @USAGE: <file-contents>
233 # @INTERNAL
234 # @DESCRIPTION:
235 # Parse .gitmodules contents passed as <file-contents>
236 # as in "$(cat .gitmodules)"). Composes a 'submodules' array that
237 # contains in order (name, URL, path) for each submodule.
238 _git-r3_set_submodules() {
239 debug-print-function ${FUNCNAME} "$@"
240
241 local data=${1}
242
243 # ( name url path ... )
244 submodules=()
245
246 local l
247 while read l; do
248 # submodule.<path>.path=<path>
249 # submodule.<path>.url=<url>
250 [[ ${l} == submodule.*.url=* ]] || continue
251
252 l=${l#submodule.}
253 local subname=${l%%.url=*}
254
255 # skip modules that have 'update = none', bug #487262.
256 local upd=$(echo "${data}" | git config -f /dev/fd/0 \
257 submodule."${subname}".update)
258 [[ ${upd} == none ]] && continue
259
260 submodules+=(
261 "${subname}"
262 "$(echo "${data}" | git config -f /dev/fd/0 \
263 submodule."${subname}".url || die)"
264 "$(echo "${data}" | git config -f /dev/fd/0 \
265 submodule."${subname}".path || die)"
266 )
267 done < <(echo "${data}" | git config -f /dev/fd/0 -l || die)
268 }
269
270 # @FUNCTION: _git-r3_smart_fetch
271 # @USAGE: <git-fetch-args>...
272 # @DESCRIPTION:
273 # Try fetching without '--depth' and switch to '--depth 1' if that
274 # will involve less objects fetched.
275 _git-r3_smart_fetch() {
276 debug-print-function ${FUNCNAME} "$@"
277
278 local sed_regexp='.*Counting objects: \([0-9]*\), done\..*'
279
280 # start the main fetch
281 local cmd=( git fetch --progress "${@}" )
282 echo "${cmd[@]}" >&2
283
284 # we copy the output to the 'sed' pipe for parsing. whenever sed finds
285 # the process count, it quits quickly to avoid delays in writing it.
286 # then, we start a dummy 'cat' to keep the pipe alive
287
288 "${cmd[@]}" 2>&1 \
289 | tee >(
290 sed -n -e "/${sed_regexp}/{s/${sed_regexp}/\1/p;q}" \
291 > "${T}"/git-r3_main.count
292 exec cat >/dev/null
293 ) &
294 local main_pid=${!}
295
296 # start the helper process
297 _git-r3_sub_fetch() {
298 # wait for main fetch to get object count; if the server doesn't
299 # output it, we won't even launch the parallel process
300 while [[ ! -s ${T}/git-r3_main.count ]]; do
301 sleep 0.25
302 done
303
304 # ok, let's see if parallel fetch gives us smaller count
305 # --dry-run will prevent it from writing to the local clone
306 # and sed should terminate git with SIGPIPE
307 local sub_count=$(git fetch --progress --dry-run --depth 1 "${@}" 2>&1 \
308 | sed -n -e "/${sed_regexp}/{s/${sed_regexp}/\1/p;q}")
309 local main_count=$(<"${T}"/git-r3_main.count)
310
311 # let's be real sure that '--depth 1' will be good for us.
312 # note that we have purely objects counts, and '--depth 1'
313 # may involve much bigger objects
314 if [[ ${main_count} && ${main_count} -ge $(( sub_count * 3/2 )) ]]
315 then
316 # signal that we want shallow fetch instead,
317 # and terminate the non-shallow fetch process
318 touch "${T}"/git-r3_want_shallow || die
319 kill ${main_pid} &>/dev/null
320 exit 0
321 fi
322
323 exit 1
324 }
325 _git-r3_sub_fetch "${@}" &
326 local sub_pid=${!}
327
328 # wait for main process to terminate, either of its own
329 # or by signal from subprocess
330 wait ${main_pid}
331 local main_ret=${?}
332
333 # wait for subprocess to terminate, killing it if necessary.
334 # if main fetch finished before it, there's no point in keeping
335 # it alive. if main fetch was killed by it, it's done anyway
336 kill ${sub_pid} &>/dev/null
337 wait ${sub_pid}
338
339 # now see if subprocess wanted to tell us something...
340 if [[ -f ${T}/git-r3_want_shallow ]]; then
341 rm "${T}"/git-r3_want_shallow || die
342
343 # if fetch finished already (wasn't killed), ignore it
344 [[ ${main_ret} -eq 0 ]] && return 0
345
346 # otherwise, restart as shallow fetch
347 einfo "Restarting fetch using --depth 1 to save bandwidth ..."
348 local cmd=( git fetch --progress --depth 1 "${@}" )
349 echo "${cmd[@]}" >&2
350 "${cmd[@]}"
351 main_ret=${?}
352 fi
353
354 return ${main_ret}
355 }
356
357 # @FUNCTION: git-r3_fetch
358 # @USAGE: [<repo-uri> [<remote-ref> [<local-id>]]]
359 # @DESCRIPTION:
360 # Fetch new commits to the local clone of repository.
361 #
362 # <repo-uri> specifies the repository URIs to fetch from, as a space-
363 # -separated list. The first URI will be used as repository group
364 # identifier and therefore must be used consistently. When not
365 # specified, defaults to ${EGIT_REPO_URI}.
366 #
367 # <remote-ref> specifies the remote ref or commit id to fetch.
368 # It is preferred to use 'refs/heads/<branch-name>' for branches
369 # and 'refs/tags/<tag-name>' for tags. Other options are 'HEAD'
370 # for upstream default branch and hexadecimal commit SHA1. Defaults
371 # to the first of EGIT_COMMIT, EGIT_BRANCH or literal 'HEAD' that
372 # is set to a non-null value.
373 #
374 # <local-id> specifies the local branch identifier that will be used to
375 # locally store the fetch result. It should be unique to multiple
376 # fetches within the repository that can be performed at the same time
377 # (including parallel merges). It defaults to ${CATEGORY}/${PN}/${SLOT%/*}.
378 # This default should be fine unless you are fetching multiple trees
379 # from the same repository in the same ebuild.
380 #
381 # The fetch operation will affect the EGIT_STORE only. It will not touch
382 # the working copy, nor export any environment variables.
383 # If the repository contains submodules, they will be fetched
384 # recursively.
385 git-r3_fetch() {
386 debug-print-function ${FUNCNAME} "$@"
387
388 [[ ${EVCS_OFFLINE} ]] && return
389
390 local repos
391 if [[ ${1} ]]; then
392 repos=( ${1} )
393 elif [[ $(declare -p EGIT_REPO_URI) == "declare -a"* ]]; then
394 repos=( "${EGIT_REPO_URI[@]}" )
395 else
396 repos=( ${EGIT_REPO_URI} )
397 fi
398
399 local branch=${EGIT_BRANCH:+refs/heads/${EGIT_BRANCH}}
400 local remote_ref=${2:-${EGIT_COMMIT:-${branch:-HEAD}}}
401 local local_id=${3:-${CATEGORY}/${PN}/${SLOT%/*}}
402 local local_ref=refs/heads/${local_id}/__main__
403
404 [[ ${repos[@]} ]] || die "No URI provided and EGIT_REPO_URI unset"
405
406 local -x GIT_DIR
407 _git-r3_set_gitdir "${repos[0]}"
408
409 # try to fetch from the remote
410 local r success
411 for r in "${repos[@]}"; do
412 einfo "Fetching ${remote_ref} from ${r} ..."
413
414 local is_branch lookup_ref
415 if [[ ${remote_ref} == refs/heads/* || ${remote_ref} == HEAD ]]
416 then
417 is_branch=1
418 lookup_ref=${remote_ref}
419 else
420 # ls-remote by commit is going to fail anyway,
421 # so we may as well pass refs/tags/ABCDEF...
422 lookup_ref=refs/tags/${remote_ref}
423 fi
424
425 # first, try ls-remote to see if ${remote_ref} is a real ref
426 # and not a commit id. if it succeeds, we can pass ${remote_ref}
427 # to 'fetch'. otherwise, we will just fetch everything
428
429 # split on whitespace
430 local ref=(
431 $(git ls-remote "${r}" "${lookup_ref}" || echo __FAIL__)
432 )
433
434 # normally, ref[0] is a hash, so we can do magic strings here
435 [[ ${ref[0]} == __FAIL__ ]] && continue
436
437 local nonshallow=${EGIT_NONSHALLOW}
438 local ref_param=()
439 if [[ ! ${ref[0]} ]]; then
440 nonshallow=1
441 fi
442
443 # 1. if we need a non-shallow clone and we have a shallow one,
444 # we need to unshallow it explicitly.
445 # 2. if we want a shallow clone, we just pass '--depth 1'
446 # to the first fetch in the repo. passing '--depth'
447 # to further requests usually results in more data being
448 # downloaded than without it.
449 # 3. if we update a shallow clone, we try without '--depth'
450 # first since that usually transfers less data. however,
451 # we use git-r3_smart_fetch that can switch into '--depth 1'
452 # if that looks beneficial.
453
454 local fetch_command=( git fetch )
455 if [[ ${nonshallow} ]]; then
456 if [[ -f ${GIT_DIR}/shallow ]]; then
457 ref_param+=( --unshallow )
458 fi
459 # fetch all branches
460 ref_param+=( "refs/heads/*:refs/remotes/origin/*" )
461 else
462 # 'git show-ref --heads' returns 1 when there are no branches
463 if ! git show-ref --heads -q; then
464 ref_param+=( --depth 1 )
465 else
466 fetch_command=( _git-r3_smart_fetch )
467 fi
468 fi
469
470 # now, another important thing. we may only fetch a remote
471 # branch directly to a local branch. Otherwise, we need to fetch
472 # the commit and re-create the branch on top of it.
473
474 if [[ ${ref[0]} ]]; then
475 if [[ ${is_branch} ]]; then
476 ref_param+=( -f "${remote_ref}:${local_id}/__main__" )
477 else
478 ref_param+=( "refs/tags/${remote_ref}" )
479 fi
480 fi
481
482 # if ${remote_ref} is branch or tag, ${ref[@]} will contain
483 # the respective commit id. otherwise, it will be an empty
484 # array, so the following won't evaluate to a parameter.
485 set -- "${fetch_command[@]}" --no-tags "${r}" "${ref_param[@]}"
486 echo "${@}" >&2
487 if "${@}"; then
488 if [[ ! ${is_branch} ]]; then
489 set -- git branch -f "${local_id}/__main__" \
490 "${ref[0]:-${remote_ref}}"
491 echo "${@}" >&2
492 if ! "${@}"; then
493 die "Creating branch for ${remote_ref} failed (wrong ref?)."
494 fi
495 fi
496
497 success=1
498 break
499 fi
500 done
501 [[ ${success} ]] || die "Unable to fetch from any of EGIT_REPO_URI"
502
503 # recursively fetch submodules
504 if git cat-file -e "${local_ref}":.gitmodules &>/dev/null; then
505 local submodules
506 _git-r3_set_submodules \
507 "$(git cat-file -p "${local_ref}":.gitmodules || die)"
508
509 while [[ ${submodules[@]} ]]; do
510 local subname=${submodules[0]}
511 local url=${submodules[1]}
512 local path=${submodules[2]}
513 local commit=$(git rev-parse "${local_ref}:${path}")
514
515 if [[ ! ${commit} ]]; then
516 die "Unable to get commit id for submodule ${subname}"
517 fi
518 if [[ ${url} == ./* || ${url} == ../* ]]; then
519 local subrepos=( "${repos[@]/%//${url}}" )
520 else
521 local subrepos=( "${url}" )
522 fi
523
524 git-r3_fetch "${subrepos[*]}" "${commit}" "${local_id}/${subname}"
525
526 submodules=( "${submodules[@]:3}" ) # shift
527 done
528 fi
529 }
530
531 # @FUNCTION: git-r3_checkout
532 # @USAGE: [<repo-uri> [<checkout-path> [<local-id>]]]
533 # @DESCRIPTION:
534 # Check the previously fetched tree to the working copy.
535 #
536 # <repo-uri> specifies the repository URIs, as a space-separated list.
537 # The first URI will be used as repository group identifier
538 # and therefore must be used consistently with git-r3_fetch.
539 # The remaining URIs are not used and therefore may be omitted.
540 # When not specified, defaults to ${EGIT_REPO_URI}.
541 #
542 # <checkout-path> specifies the path to place the checkout. It defaults
543 # to ${EGIT_CHECKOUT_DIR} if set, otherwise to ${WORKDIR}/${P}.
544 #
545 # <local-id> needs to specify the local identifier that was used
546 # for respective git-r3_fetch.
547 #
548 # The checkout operation will write to the working copy, and export
549 # the repository state into the environment. If the repository contains
550 # submodules, they will be checked out recursively.
551 git-r3_checkout() {
552 debug-print-function ${FUNCNAME} "$@"
553
554 local repos
555 if [[ ${1} ]]; then
556 repos=( ${1} )
557 elif [[ $(declare -p EGIT_REPO_URI) == "declare -a"* ]]; then
558 repos=( "${EGIT_REPO_URI[@]}" )
559 else
560 repos=( ${EGIT_REPO_URI} )
561 fi
562
563 local out_dir=${2:-${EGIT_CHECKOUT_DIR:-${WORKDIR}/${P}}}
564 local local_id=${3:-${CATEGORY}/${PN}/${SLOT%/*}}
565
566 local -x GIT_DIR GIT_WORK_TREE
567 _git-r3_set_gitdir "${repos[0]}"
568 GIT_WORK_TREE=${out_dir}
569 mkdir -p "${GIT_WORK_TREE}" || die
570
571 einfo "Checking out ${repos[0]} to ${out_dir} ..."
572
573 if ! git cat-file -e refs/heads/"${local_id}"/__main__
574 then
575 if [[ ${EVCS_OFFLINE} ]]; then
576 die "No local clone of ${repos[0]}. Unable to work with EVCS_OFFLINE."
577 else
578 die "Logic error: no local clone of ${repos[0]}. git-r3_fetch not used?"
579 fi
580 fi
581
582 # Note: this is a hack to avoid parallel checkout issues.
583 # I will try to handle it without locks when I have more time.
584 local lockfile=${GIT_DIR}/.git-r3_checkout_lock
585 local lockfile_l=${lockfile}.${BASHPID}
586 touch "${lockfile_l}" || die
587 until ln "${lockfile_l}" "${lockfile}" &>/dev/null; do
588 sleep 1
589 done
590 rm "${lockfile_l}" || die
591
592 set -- git checkout -f "${local_id}"/__main__ .
593 echo "${@}" >&2
594 "${@}"
595 local ret=${?}
596
597 # Remove the lock!
598 rm "${lockfile}" || die
599
600 [[ ${ret} == 0 ]] || die "git checkout ${local_id}/__main__ failed"
601
602 # diff against previous revision (if any)
603 local new_commit_id=$(git rev-parse --verify "${local_id}"/__main__)
604 local old_commit_id=$(
605 git rev-parse --verify "${local_id}"/__old__ 2>/dev/null
606 )
607
608 if [[ ! ${old_commit_id} ]]; then
609 echo "GIT NEW branch -->"
610 echo " repository: ${repos[0]}"
611 echo " at the commit: ${new_commit_id}"
612 else
613 echo "GIT update -->"
614 echo " repository: ${repos[0]}"
615 # write out message based on the revisions
616 if [[ "${old_commit_id}" != "${new_commit_id}" ]]; then
617 echo " updating from commit: ${old_commit_id}"
618 echo " to commit: ${new_commit_id}"
619
620 git --no-pager diff --stat \
621 ${old_commit_id}..${new_commit_id}
622 else
623 echo " at the commit: ${new_commit_id}"
624 fi
625 fi
626 git branch -f "${local_id}"/{__old__,__main__} || die
627
628 # recursively checkout submodules
629 if [[ -f ${GIT_WORK_TREE}/.gitmodules ]]; then
630 local submodules
631 _git-r3_set_submodules \
632 "$(<"${GIT_WORK_TREE}"/.gitmodules)"
633
634 while [[ ${submodules[@]} ]]; do
635 local subname=${submodules[0]}
636 local url=${submodules[1]}
637 local path=${submodules[2]}
638
639 if [[ ${url} == ./* || ${url} == ../* ]]; then
640 url=${repos[0]%%/}/${url}
641 fi
642
643 git-r3_checkout "${url}" "${GIT_WORK_TREE}/${path}" \
644 "${local_id}/${subname}"
645
646 submodules=( "${submodules[@]:3}" ) # shift
647 done
648 fi
649
650 # keep this *after* submodules
651 export EGIT_DIR=${GIT_DIR}
652 export EGIT_VERSION=${new_commit_id}
653
654 # create a fake '.git' directory to satisfy 'git rev-parse HEAD'
655 GIT_DIR=${GIT_WORK_TREE}/.git
656 git init || die
657 echo "${EGIT_VERSION}" > "${GIT_WORK_TREE}"/.git/HEAD || die
658 }
659
660 # @FUNCTION: git-r3_peek_remote_ref
661 # @USAGE: [<repo-uri> [<remote-ref>]]
662 # @DESCRIPTION:
663 # Peek the reference in the remote repository and print the matching
664 # (newest) commit SHA1.
665 #
666 # <repo-uri> specifies the repository URIs to fetch from, as a space-
667 # -separated list. When not specified, defaults to ${EGIT_REPO_URI}.
668 #
669 # <remote-ref> specifies the remote ref to peek. It is preferred to use
670 # 'refs/heads/<branch-name>' for branches and 'refs/tags/<tag-name>'
671 # for tags. Alternatively, 'HEAD' may be used for upstream default
672 # branch. Defaults to the first of EGIT_COMMIT, EGIT_BRANCH or literal
673 # 'HEAD' that is set to a non-null value.
674 #
675 # The operation will be done purely on the remote, without using local
676 # storage. If commit SHA1 is provided as <remote-ref>, the function will
677 # fail due to limitations of git protocol.
678 #
679 # On success, the function returns 0 and writes hexadecimal commit SHA1
680 # to stdout. On failure, the function returns 1.
681 git-r3_peek_remote_ref() {
682 debug-print-function ${FUNCNAME} "$@"
683
684 local repos
685 if [[ ${1} ]]; then
686 repos=( ${1} )
687 elif [[ $(declare -p EGIT_REPO_URI) == "declare -a"* ]]; then
688 repos=( "${EGIT_REPO_URI[@]}" )
689 else
690 repos=( ${EGIT_REPO_URI} )
691 fi
692
693 local branch=${EGIT_BRANCH:+refs/heads/${EGIT_BRANCH}}
694 local remote_ref=${2:-${EGIT_COMMIT:-${branch:-HEAD}}}
695
696 [[ ${repos[@]} ]] || die "No URI provided and EGIT_REPO_URI unset"
697
698 local r success
699 for r in "${repos[@]}"; do
700 einfo "Peeking ${remote_ref} on ${r} ..." >&2
701
702 local is_branch lookup_ref
703 if [[ ${remote_ref} == refs/heads/* || ${remote_ref} == HEAD ]]
704 then
705 is_branch=1
706 lookup_ref=${remote_ref}
707 else
708 # ls-remote by commit is going to fail anyway,
709 # so we may as well pass refs/tags/ABCDEF...
710 lookup_ref=refs/tags/${remote_ref}
711 fi
712
713 # split on whitespace
714 local ref=(
715 $(git ls-remote "${r}" "${lookup_ref}")
716 )
717
718 if [[ ${ref[0]} ]]; then
719 echo "${ref[0]}"
720 return 0
721 fi
722 done
723
724 return 1
725 }
726
727 git-r3_src_fetch() {
728 debug-print-function ${FUNCNAME} "$@"
729
730 if [[ ! ${EGIT3_STORE_DIR} && ${EGIT_STORE_DIR} ]]; then
731 ewarn "You have set EGIT_STORE_DIR but not EGIT3_STORE_DIR. Please consider"
732 ewarn "setting EGIT3_STORE_DIR for git-r3.eclass. It is recommended to use"
733 ewarn "a different directory than EGIT_STORE_DIR to ease removing old clones"
734 ewarn "when git-2 eclass becomes deprecated."
735 fi
736
737 _git-r3_env_setup
738 git-r3_fetch
739 }
740
741 git-r3_src_unpack() {
742 debug-print-function ${FUNCNAME} "$@"
743
744 _git-r3_env_setup
745 git-r3_src_fetch
746 git-r3_checkout
747 }
748
749 # https://bugs.gentoo.org/show_bug.cgi?id=482666
750 git-r3_pkg_outofdate() {
751 debug-print-function ${FUNCNAME} "$@"
752
753 local new_commit_id=$(git-r3_peek_remote_ref)
754 ewarn "old: ${EGIT_VERSION}"
755 ewarn "new: ${new_commit_id}"
756 [[ ${new_commit_id} && ${old_commit_id} ]] || return 2
757
758 [[ ${EGIT_VERSION} != ${new_commit_id} ]]
759 }
760
761 _GIT_R3=1
762 fi

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