From a48e1d67e167507091f25dc00e2bd6c280fa538e Mon Sep 17 00:00:00 2001 From: Junio C Hamano Date: Sat, 4 Jun 2005 23:11:38 -0700 Subject: [PATCH] [PATCH] pull: gracefully recover from delta retrieval failure. This addresses a concern raised by Jason McMullan in the mailing list discussion. After retrieving and storing a potentially deltified object, pull logic tries to check and fulfil its delta dependency. When the pull procedure is killed at this point, however, there was no easy way to recover by re-running pull, since next run would have found that we already have that deltified object and happily reported success, without really checking its delta dependency is satisfied. This patch introduces --recover option to git-*-pull family which causes them to re-validate dependency of deltified objects we are fetching. A new test t5100-delta-pull.sh covers such a failure mode. Signed-off-by: Junio C Hamano Signed-off-by: Linus Torvalds --- Documentation/git-http-pull.txt | 5 +- Documentation/git-local-pull.txt | 5 +- Documentation/git-rpull.txt | 5 +- http-pull.c | 4 +- local-pull.c | 4 +- pull.c | 15 ++++-- pull.h | 4 +- rpull.c | 4 +- t/t5100-delta-pull.sh | 79 ++++++++++++++++++++++++++++++++ 9 files changed, 113 insertions(+), 12 deletions(-) create mode 100644 t/t5100-delta-pull.sh diff --git a/Documentation/git-http-pull.txt b/Documentation/git-http-pull.txt index 8b54f09c2..e4b7b3789 100644 --- a/Documentation/git-http-pull.txt +++ b/Documentation/git-http-pull.txt @@ -9,7 +9,7 @@ git-http-pull - Downloads a remote GIT repository via HTTP SYNOPSIS -------- -'git-http-pull' [-c] [-t] [-a] [-v] [-d] commit-id url +'git-http-pull' [-c] [-t] [-a] [-v] [-d] [--recover] commit-id url DESCRIPTION ----------- @@ -25,6 +25,9 @@ Downloads a remote GIT repository via HTTP. Do not check for delta base objects (use this option only when you know the remote repository is not deltified). +--recover:: + Check dependency of deltified object more carefully than + usual, to recover after earlier pull that was interrupted. -v:: Report what is downloaded. diff --git a/Documentation/git-local-pull.txt b/Documentation/git-local-pull.txt index 79d0f5c28..4bc66e77b 100644 --- a/Documentation/git-local-pull.txt +++ b/Documentation/git-local-pull.txt @@ -9,7 +9,7 @@ git-local-pull - Duplicates another GIT repository on a local system SYNOPSIS -------- -'git-local-pull' [-c] [-t] [-a] [-l] [-s] [-n] [-v] [-d] commit-id path +'git-local-pull' [-c] [-t] [-a] [-l] [-s] [-n] [-v] [-d] [--recover] commit-id path DESCRIPTION ----------- @@ -27,6 +27,9 @@ OPTIONS Do not check for delta base objects (use this option only when you know the remote repository is not deltified). +--recover:: + Check dependency of deltified object more carefully than + usual, to recover after earlier pull that was interrupted. -v:: Report what is downloaded. diff --git a/Documentation/git-rpull.txt b/Documentation/git-rpull.txt index 3a8386629..a6c40ae97 100644 --- a/Documentation/git-rpull.txt +++ b/Documentation/git-rpull.txt @@ -10,7 +10,7 @@ git-rpull - Pulls from a remote repository over ssh connection SYNOPSIS -------- -'git-rpull' [-c] [-t] [-a] [-d] [-v] commit-id url +'git-rpull' [-c] [-t] [-a] [-d] [-v] [--recover] commit-id url DESCRIPTION ----------- @@ -29,6 +29,9 @@ OPTIONS Do not check for delta base objects (use this option only when you know the remote repository is not deltified). +--recover:: + Check dependency of deltified object more carefully than + usual, to recover after earlier pull that was interrupted. -v:: Report what is downloaded. diff --git a/http-pull.c b/http-pull.c index 551663e49..ec7f66af8 100644 --- a/http-pull.c +++ b/http-pull.c @@ -105,6 +105,8 @@ int main(int argc, char **argv) get_history = 1; } else if (argv[arg][1] == 'd') { get_delta = 0; + } else if (!strcmp(argv[arg], "--recover")) { + get_delta = 2; } else if (argv[arg][1] == 'a') { get_all = 1; get_tree = 1; @@ -115,7 +117,7 @@ int main(int argc, char **argv) arg++; } if (argc < arg + 2) { - usage("git-http-pull [-c] [-t] [-a] [-d] [-v] commit-id url"); + usage("git-http-pull [-c] [-t] [-a] [-d] [-v] [--recover] commit-id url"); return 1; } commit_id = argv[arg]; diff --git a/local-pull.c b/local-pull.c index e5d834ff2..afdba9f52 100644 --- a/local-pull.c +++ b/local-pull.c @@ -74,7 +74,7 @@ int fetch(unsigned char *sha1) } static const char *local_pull_usage = -"git-local-pull [-c] [-t] [-a] [-l] [-s] [-n] [-v] [-d] commit-id path"; +"git-local-pull [-c] [-t] [-a] [-l] [-s] [-n] [-v] [-d] [--recover] commit-id path"; /* * By default we only use file copy. @@ -94,6 +94,8 @@ int main(int argc, char **argv) get_history = 1; else if (argv[arg][1] == 'd') get_delta = 0; + else if (!strcmp(argv[arg], "--recover")) + get_delta = 2; else if (argv[arg][1] == 'a') { get_all = 1; get_tree = 1; diff --git a/pull.c b/pull.c index cd77738ac..f4f1d8fcd 100644 --- a/pull.c +++ b/pull.c @@ -6,6 +6,7 @@ int get_tree = 0; int get_history = 0; +/* 1 means "get delta", 2 means "really check delta harder */ int get_delta = 1; int get_all = 0; int get_verbosely = 0; @@ -32,12 +33,16 @@ static void report_missing(const char *what, const unsigned char *missing) static int make_sure_we_have_it(const char *what, unsigned char *sha1) { - int status; - if (has_sha1_file(sha1)) + int status = 0; + + if (!has_sha1_file(sha1)) { + status = fetch(sha1); + if (status && what) + report_missing(what, sha1); + } + else if (get_delta < 2) return 0; - status = fetch(sha1); - if (status && what) - report_missing(what, sha1); + if (get_delta) { char delta_sha1[20]; status = sha1_delta_base(sha1, delta_sha1); diff --git a/pull.h b/pull.h index 3cd14cfb8..30086fdb1 100644 --- a/pull.h +++ b/pull.h @@ -13,7 +13,9 @@ extern int get_history; /** Set to fetch the trees in the commit history. **/ extern int get_all; -/* Set to zero to skip the check for delta object base. */ +/* Set to zero to skip the check for delta object base; + * set to two to check delta dependency even for objects we already have. + */ extern int get_delta; /* Set to be verbose */ diff --git a/rpull.c b/rpull.c index f4ab89836..a332fba23 100644 --- a/rpull.c +++ b/rpull.c @@ -52,6 +52,8 @@ int main(int argc, char **argv) get_history = 1; } else if (argv[arg][1] == 'd') { get_delta = 0; + } else if (!strcmp(argv[arg], "--recover")) { + get_delta = 2; } else if (argv[arg][1] == 'a') { get_all = 1; get_tree = 1; @@ -62,7 +64,7 @@ int main(int argc, char **argv) arg++; } if (argc < arg + 2) { - usage("git-rpull [-c] [-t] [-a] [-v] [-d] commit-id url"); + usage("git-rpull [-c] [-t] [-a] [-v] [-d] [--recover] commit-id url"); return 1; } commit_id = argv[arg]; diff --git a/t/t5100-delta-pull.sh b/t/t5100-delta-pull.sh new file mode 100644 index 000000000..8693c5ce8 --- /dev/null +++ b/t/t5100-delta-pull.sh @@ -0,0 +1,79 @@ +#!/bin/sh +# +# Copyright (c) 2005 Junio C Hamano +# + +test_description='Test pulling deltified objects + +' +. ./test-lib.sh + +locate_obj='s|\(..\)|.git/objects/\1/|' + +test_expect_success \ + setup \ + 'cat ../README >a && + git-update-cache --add a && + a0=`git-ls-files --stage | + sed -e '\''s/^[0-7]* \([0-9a-f]*\) .*/\1/'\''` && + + sed -e 's/test/TEST/g' ../README >a && + git-update-cache a && + a1=`git-ls-files --stage | + sed -e '\''s/^[0-7]* \([0-9a-f]*\) .*/\1/'\''` && + tree=`git-write-tree` && + commit=`git-commit-tree $tree .git/HEAD && + git-mkdelta -v $a0 $a1 && + ls -l $a0f $a1f' + +# Now commit has a tree that records delitified "a" whose SHA1 is a1. +# Create a new repo and pull this commit into it. + +test_expect_success \ + 'setup and cd into new repo' \ + 'mkdir dest && cd dest && rm -fr .git && git-init-db' + +test_expect_success \ + 'pull from deltified repo into a new repo without -d' \ + 'rm -fr .git a && git-init-db && + git-local-pull -v -a $commit ../.git/ && + git-cat-file blob $a1 >a && + diff -u a ../a' + +test_expect_failure \ + 'pull from deltified repo into a new repo with -d' \ + 'rm -fr .git a && git-init-db && + git-local-pull -v -a -d $commit ../.git/ && + git-cat-file blob $a1 >a && + diff -u a ../a' + +test_expect_failure \ + 'pull from deltified repo after delta failure without --recover' \ + 'rm -f a && + git-local-pull -v -a $commit ../.git/ && + git-cat-file blob $a1 >a && + diff -u a ../a' + +test_expect_success \ + 'pull from deltified repo after delta failure with --recover' \ + 'rm -f a && + git-local-pull -v -a --recover $commit ../.git/ && + git-cat-file blob $a1 >a && + diff -u a ../a' + +test_expect_success \ + 'missing-tree or missing-blob should be re-fetched without --recover' \ + 'rm -f a $a0f $a1f && + git-local-pull -v -a $commit ../.git/ && + git-cat-file blob $a1 >a && + diff -u a ../a' + +test_done + -- 2.26.2