{"id":141016,"date":"2025-08-19T11:11:54","date_gmt":"2025-08-19T09:11:54","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/vypusk-sistemy-upravleniya-ishodnymi-tekstami-git-2-51"},"modified":"2025-08-19T11:11:54","modified_gmt":"2025-08-19T09:11:54","slug":"vypusk-sistemy-upravleniya-ishodnymi-tekstami-git-2-51","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/vypusk-sistemy-upravleniya-ishodnymi-tekstami-git-2-51","title":{"rendered":"Vyd\u00e1n\u00ed syst\u00e9mu pro spr\u00e1vu verz\u00ed Git 2.51","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Po dvou m\u011bs\u00edc\u00edch v\u00fdvoje byl p\u0159edstaven vyd\u00e1n\u00ed distribuovan\u00e9ho syst\u00e9mu spr\u00e1vy zdrojov\u00fdch k\u00f3d\u016f Git 2.51. Git se vyzna\u010duje vysok\u00fdm v\u00fdkonem a poskytuje prost\u0159edky pro neline\u00e1rn\u00ed v\u00fdvoj zalo\u017een\u00fd na v\u011btven\u00ed a slu\u010dov\u00e1n\u00ed v\u011btv\u00ed. Pro zaji\u0161t\u011bn\u00ed integrity historie a odolnosti v\u016f\u010di zm\u011bn\u00e1m \u201ezp\u011btn\u011b\u201c se pou\u017e\u00edv\u00e1 implicitn\u00ed hashov\u00e1n\u00ed cel\u00e9 p\u0159edchoz\u00ed historie v ka\u017ed\u00e9m commitu a tak\u00e9 ov\u011b\u0159ov\u00e1n\u00ed digit\u00e1ln\u00edmi podpisy v\u00fdvoj\u00e1\u0159\u016f jednotliv\u00fdch tag\u016f a commit\u016f. K\u00f3d Git je distribuov\u00e1n pod licenc\u00ed GPLv2+.    <\/p>\n<p>Ve srovn\u00e1n\u00ed s p\u0159edchoz\u00edm vyd\u00e1n\u00edm bylo do nov\u00e9 verze p\u0159ijato 506 zm\u011bn, kter\u00e9 byly p\u0159ipraveny za \u00fa\u010dasti 91 v\u00fdvoj\u00e1\u0159e (21 z nich se pod\u00edlelo na v\u00fdvoji Gitu poprv\u00e9). Hlavn\u00ed novinky (1, 2, 3):  <\/p>\n<ul>\n<li class=\"l\"> Byl zv\u00fd\u0161en v\u00fdkon p\u0159\u00edkaz\u016f \u201egit push\u201c a \u201egit fetch\u201c v repozit\u00e1\u0159\u00edch s velk\u00fdm po\u010dtem odkaz\u016f. Zrychlen\u00ed bylo dosa\u017eeno d\u00edky aktualizaci odkaz\u016f v d\u00e1vkov\u00e9m re\u017eimu, ve kter\u00e9m je v jedn\u00e9 transakci zpracov\u00e1no n\u011bkolik odkaz\u016f najednou, nam\u00edsto vytv\u00e1\u0159en\u00ed samostatn\u00e9 transakce pro aktualizaci ka\u017ed\u00e9ho odkazu. Optimalizace v\u00fdrazn\u011b zv\u00fd\u0161ila v\u00fdkon backendu \u201ereftable\u201c, kter\u00fd nyn\u00ed p\u0159ed\u010d\u00ed backend \u201efiles\u201c. Nap\u0159\u00edklad v testovac\u00edm repozit\u00e1\u0159i s 10 tis\u00edci odkazy se v\u00fdkon \u201egit fetch\u201c p\u0159i pou\u017eit\u00ed backendu \u201ereftable\u201c zv\u00fd\u0161il 22kr\u00e1t, zat\u00edmco p\u0159i pou\u017eit\u00ed backendu \u201efiles\u201c \u2014 o 1,25kr\u00e1t. Pro \u201egit push\u201c byl p\u0159\u00edr\u016fstek 18 a 1,21kr\u00e1t, respektive.\n<li class=\"l\"> Byla navr\u017eena nov\u00e1 metoda balen\u00ed v pack-souborech \u010d\u00e1st\u00ed repozit\u00e1\u0159e, kter\u00e9 nejsou spojeny s sledov\u00e1n\u00edm nedosa\u017eiteln\u00fdch objekt\u016f, na kter\u00e9 v repozit\u00e1\u0159i neexistuj\u00ed odkazy (nejsou na n\u011b odkazy v\u011btve nebo tagy). Informace o nedosa\u017eiteln\u00fdch objektech jsou ulo\u017eeny v samostatn\u00fdch pack-souborech (\u201ecruft packs\u201c), co\u017e vedlo k nutnosti jejich zobrazen\u00ed v mnohopackov\u00fdch indexech MIDX (multi-pack index) pro zahrnut\u00ed objekt\u016f, kter\u00e9 byly p\u016fvodn\u011b nedosa\u017eiteln\u00e9 a byly uchov\u00e1v\u00e1ny pouze v cruft-paketech, ale pozd\u011bji se staly dosa\u017eiteln\u00fdmi po commituj\u00edc\u00edm odkazu.\n<p>V nov\u00e9 verzi je p\u0159i znovu zabalen\u00ed pack soubor\u016f zaji\u0161t\u011bno uchov\u00e1n\u00ed dodate\u010dn\u00fdch kopi\u00ed dostupn\u00fdch objekt\u016f, kter\u00e9 jsou uchov\u00e1v\u00e1ny pouze v cruft souborech. Toto zm\u011bna zaru\u010duje, \u017ee v sad\u011b pack soubor\u016f, pou\u017e\u00edvan\u00fdch pro \u00faschovu dostupn\u00fdch objekt\u016f, nejsou obsa\u017eeny objekty, kter\u00e9 odkazuj\u00ed na jin\u00e9 objekty, uchov\u00e1van\u00e9 mimo tuto sadu. Pro vylou\u010den\u00ed nedostupn\u00e9ho obsahu cruft soubor\u016f z v\u00edcen\u00e1sobn\u00fdch index\u016f (MIDX) byla navr\u017eena konfigurace \u201erepack.MIDXMustContainCruft\u201c, kter\u00e1 umo\u017e\u0148uje v\u00fdrazn\u011b zmen\u0161it velikost takov\u00fdch index\u016f. Aktivace t\u00e9to konfigurace v repozit\u00e1\u0159i GitHub vedla ke zmen\u0161en\u00ed velikosti MIDX index\u016f o 38 %, zrychlen\u00ed z\u00e1pisu do MIDX index\u016f o 35 % a ke zv\u00fd\u0161en\u00ed v\u00fdkonnosti \u010dten\u00ed o 5 %.      <\/p>\n<li class=\"l\"> Do p\u0159\u00edkazu \u201egit pack-objects\u201c byla p\u0159id\u00e1na volba \u201e--path-walk\u201c, kter\u00e1 zahrnuje nov\u00fd metod sb\u011bru informac\u00ed o objektech p\u0159i znovu zabalen\u00ed pack soubor\u016f. M\u00edsto proch\u00e1zen\u00ed objekt\u016f podle reviz\u00ed, p\u0159i pou\u017eit\u00ed re\u017eimu \u201e--path-walk\u201c jsou objekty proch\u00e1zeny prost\u0159ednictv\u00edm cest k soubor\u016fm, co\u017e umo\u017e\u0148uje sou\u010dasn\u011b zabalit v\u0161echny objekty se stejnou cestou k souboru. Tento p\u0159\u00edstup umo\u017e\u0148uje vylou\u010dit heuristiku vyu\u017e\u00edvaj\u00edc\u00ed hashov\u00e1n\u00ed k ur\u010den\u00ed vztahu objektu k jeho cest\u011b k souboru, a tak\u00e9 se zbavit t\u0159\u00edd\u011bn\u00ed objekt\u016f p\u0159ed zabalen\u00edm. P\u0159i pou\u017eit\u00ed re\u017eimu \u201e--path-walk\u201c se velikost generovan\u00fdch pack soubor\u016f ukazuje jako v\u00fdrazn\u011b men\u0161\u00ed ne\u017e p\u0159i seskupov\u00e1n\u00ed objekt\u016f pomoc\u00ed hash\u016f.\n<li class=\"l\"> Byl stanoven form\u00e1t pro v\u00fdm\u011bnu ulo\u017een\u00fdch stav\u016f pracovn\u00edho stromu a index\u016f v repozit\u00e1\u0159i, kter\u00e9 jsou vytvo\u0159eny pomoc\u00ed p\u0159\u00edkazu \u201egit stash\u201c. Nov\u00fd form\u00e1t umo\u017e\u0148uje k\u00f3dovat ulo\u017een\u00e9 zm\u011bny (stash z\u00e1znamy) ve form\u011b sekvence commit\u016f. Pro import a export byly navr\u017eeny podp\u0159\u00edkazy \u201egit stash import\u201c a \u201egit stash export\u201c, kter\u00e9 lze pou\u017e\u00edt k p\u0159enosu ulo\u017een\u00fdch stav\u016f z jednoho syst\u00e9mu na druh\u00fd a k prov\u00e1d\u011bn\u00ed operac\u00ed push nebo pull s t\u011bmito stavy jako s b\u011b\u017en\u00fdmi v\u011btvemi nebo tagy.       git stash export \u2014to-ref refs\/stashes\/my-stash     git push origin refs\/stashes\/my-stash     \u2026     git fetch origin \u2018+refs\/stashes\/*:refs\/stashes\/*\u2019     git stash import refs\/stashes\/my-stash\n<li class=\"l\"> V t\u00fdmu &#171;git cat-file&#187;, kter\u00fd zobrazuje obsah zadan\u00fdch objekt\u016f, byla implementov\u00e1na mo\u017enost zobrazit informace o chyb\u011bj\u00edc\u00edch objektech (nap\u0159\u00edklad v d\u016fsledku po\u0161kozen\u00ed repozit\u00e1\u0159e) a submodulech p\u0159i pou\u017eit\u00ed mo\u017enost\u00ed &#171;&#8212;batch&#187; a &#171;&#8212;batch-check&#187;. D\u0159\u00edve, p\u0159i zad\u00e1n\u00ed cesty k submodulu, p\u0159\u00edkaz &#171;git cat-file &#8212;batch-check&#187; vypisoval &#171;missing&#187;, nyn\u00ed zobraz\u00ed identifik\u00e1tor objektu.\n<li class=\"l\"> P\u0159\u00edkaz &#171;git log&#187; vyu\u017e\u00edv\u00e1 optimalizace na z\u00e1klad\u011b Bloom filtr\u016f pro urychlen\u00ed vyhled\u00e1v\u00e1n\u00ed v historii zm\u011bn, jestli\u017ee jsou zad\u00e1ny filtry s n\u011bkolika cestami k soubor\u016fm, nap\u0159\u00edklad &#171;git log &#8212; path\/to\/a path\/to\/b&#187;.\n<li class=\"l\"> Byly stabilizov\u00e1ny p\u0159\u00edkazy &#171;git switch&#187; a &#171;git restore&#187;, kter\u00e9 byly od roku 2019 pova\u017eov\u00e1ny za experiment\u00e1ln\u00ed. Tyto p\u0159\u00edkazy se p\u0159edstavuj\u00ed jako modern\u00ed ekvivalenty &#171;git checkout&#187;, kter\u00e9 odd\u011bluj\u00ed tak nesouvisej\u00edc\u00ed funkce t\u00e9to p\u0159\u00edkazu, jako jsou manipulace s v\u011btvemi (p\u0159ep\u00edn\u00e1n\u00ed a vytv\u00e1\u0159en\u00ed) a obnoven\u00ed soubor\u016f v pracovn\u00edm adres\u00e1\u0159i.\n<li class=\"l\"> P\u0159\u00edkaz &#171;git whatchanged&#187; byl ozna\u010den za zastaral\u00fd a pl\u00e1nuje se jeho odstran\u011bn\u00ed ve verzi Git 3.0, je\u017e je ekvivalentn\u00ed p\u0159\u00edkazu &#171;git log &#8212;raw&#187;.\n<li class=\"l\"> Do p\u0159\u00edkazu &#171;git for-each-ref&#187; byla p\u0159id\u00e1na mo\u017enost &#171;&#8212;start-after&#187;, kter\u00e1 m\u016f\u017ee b\u00fdt pou\u017eita spolu s mo\u017enost\u00ed &#171;&#8212;count&#187; pro organizaci str\u00e1nkov\u00e9ho v\u00fdstupu.\n<li class=\"l\"> K p\u0159\u00edkaz\u016fm &#171;git merge&#187; a &#171;git pull&#187; byla p\u0159id\u00e1na mo\u017enost &#171;&#8212;compact-summary&#187;, kter\u00e1 umo\u017e\u0148uje pou\u017e\u00edvat kompaktn\u00ed form\u00e1t shrnut\u00ed zm\u011bn m\u00edsto form\u00e1tu diffstat.\n<li class=\"l\"> V k\u00f3dov\u00e9 z\u00e1kladn\u011b Git bylo povoleno pou\u017eit\u00ed kl\u00ed\u010dov\u00e9ho slova &#171;bool&#187;, kter\u00e9 se objevilo ve standardu C99. Tak\u00e9 byly zdokumentov\u00e1ny n\u011bkter\u00e9 funkce C99, kter\u00e9 byly experiment\u00e1ln\u011b pou\u017eity v Git (nap\u0159\u00edklad se v polovin\u011b roku 2026 pl\u00e1nuje povolit pou\u017eit\u00ed konstrukc\u00ed &#171;(struct foo){ .member = value };&#187;). Kompil\u00e1tor s podporou C99 je povinn\u00fd pro Git od roku 2021, av\u0161ak funkce specifikace C99 jsou zav\u00e1d\u011bny velmi opatrn\u011b, aby se zachovala kompatibilita s kompil\u00e1tory, kter\u00e9 tento standard podporuj\u00ed jen \u010d\u00e1ste\u010dn\u011b.\n<li class=\"l\"> Do pravidel pro p\u0159\u00edjem patch\u016f byly provedeny zm\u011bny, kter\u00e9 umo\u017e\u0148uj\u00ed odes\u00edl\u00e1n\u00ed patch\u016f pod p\u0159ezd\u00edvkou, nikoli pouze pod skute\u010dn\u00fdm jm\u00e9nem v\u00fdvoj\u00e1\u0159e. Zm\u011bna odpov\u00edd\u00e1 pravidl\u016fm p\u0159\u00edjmu patch\u016f do j\u00e1dra Linuxu.\n<li class=\"l\"> Byl aktualizov\u00e1n seznam zm\u011bn, kter\u00e9 naru\u0161uj\u00ed kompatibilitu a kter\u00e9 budou aplikov\u00e1ny ve v\u011btvi Git 3.0. Mezi v\u00fdznamn\u00e9 zm\u011bny v nadch\u00e1zej\u00edc\u00ed verzi Git 3.0 se uv\u00e1d\u00ed p\u0159echod na identifik\u00e1tory objekt\u016f zalo\u017een\u00e9 na algoritmu hashov\u00e1n\u00ed SHA-256 p\u0159i inicializaci nov\u00fdch repozit\u00e1\u0159\u016f a zaveden\u00ed form\u00e1tu \u201ereftable\u201c pro ukl\u00e1d\u00e1n\u00ed odkaz\u016f na v\u011btve a \u0161t\u00edtky v repozit\u00e1\u0159i (vyu\u017e\u00edv\u00e1 se blokov\u00e9 \u00falo\u017ei\u0161t\u011b z projektu JGit, optimalizovan\u00e9 pro uchov\u00e1v\u00e1n\u00ed velk\u00e9ho po\u010dtu odkaz\u016f).      <\/ul>\n<p>Zdroj: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=63742\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041f\u043e\u0441\u043b\u0435 \u0434\u0432\u0443\u0445 \u043c\u0435\u0441\u044f\u0446\u0435\u0432 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u043a\u0438 \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u0435\u043d \u0440\u0435\u043b\u0438\u0437 \u0440\u0430\u0441\u043f\u0440\u0435\u0434\u0435\u043b\u0435\u043d\u043d\u043e\u0439 \u0441\u0438\u0441\u0442\u0435\u043c\u044b \u0443\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u044f \u0438\u0441\u0445\u043e\u0434\u043d\u044b\u043c\u0438 \u0442\u0435\u043a\u0441\u0442\u0430\u043c\u0438 Git 2.51. Git \u043e\u0442\u043b\u0438\u0447\u0430\u0435\u0442\u0441\u044f \u0432\u044b\u0441\u043e\u043a\u043e\u0439 \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u044c\u044e \u0438 \u043f\u0440\u0435\u0434\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u0435\u0442 \u0441\u0440\u0435\u0434\u0441\u0442\u0432\u0430 \u043d\u0435\u043b\u0438\u043d\u0435\u0439\u043d\u043e\u0439 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u043a\u0438, \u0431\u0430\u0437\u0438\u0440\u0443\u044e\u0449\u0438\u0435\u0441\u044f \u043d\u0430 \u043e\u0442\u0432\u0435\u0442\u0432\u043b\u0435\u043d\u0438\u0438 \u0438 \u0441\u043b\u0438\u044f\u043d\u0438\u0438 \u0432\u0435\u0442\u043e\u043a. \u0414\u043b\u044f \u043e\u0431\u0435\u0441\u043f\u0435\u0447\u0435\u043d\u0438\u044f \u0446\u0435\u043b\u043e\u0441\u0442\u043d\u043e\u0441\u0442\u0438 \u0438\u0441\u0442\u043e\u0440\u0438\u0438 \u0438 \u0443\u0441\u0442\u043e\u0439\u0447\u0438\u0432\u043e\u0441\u0442\u0438 \u043a 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