diff options
| -rw-r--r-- | Documentation/git-merge.txt | 13 | ||||
| -rw-r--r-- | builtin/merge.c | 12 | ||||
| -rwxr-xr-x | t/t3033-merge-toplevel.sh | 16 | ||||
| -rwxr-xr-x | t/t3412-rebase-root.sh | 2 | ||||
| -rwxr-xr-x | t/t5500-fetch-pack.sh | 6 | ||||
| -rwxr-xr-x | t/t6009-rev-list-parent.sh | 4 | ||||
| -rwxr-xr-x | t/t6010-merge-base.sh | 6 | ||||
| -rwxr-xr-x | t/t6012-rev-list-simplify.sh | 2 | ||||
| -rwxr-xr-x | t/t6026-merge-attr.sh | 3 | ||||
| -rwxr-xr-x | t/t6029-merge-subtree.sh | 2 | ||||
| -rwxr-xr-x | t/t6101-rev-parse-parents.sh | 2 | ||||
| -rwxr-xr-x | t/t9400-git-cvsserver-server.sh | 3 |
12 files changed, 57 insertions, 14 deletions
diff --git a/Documentation/git-merge.txt b/Documentation/git-merge.txt index 07f7295ec..689aa4c57 100644 --- a/Documentation/git-merge.txt +++ b/Documentation/git-merge.txt @@ -98,6 +98,19 @@ commit or stash your changes before running 'git merge'. 'git merge --abort' is equivalent to 'git reset --merge' when `MERGE_HEAD` is present. +--allow-unrelated-histories:: + By default, `git merge` command refuses to merge histories + that do not share a common ancestor. This option can be + used to override this safety when merging histories of two + projects that started their lives independently. As that is + a very rare occasion, no configuration variable to enable + this by default exists and will not be added, and the list + of options at the top of this documentation does not mention + this option. Also `git pull` does not pass this option down + to `git merge` (instead, you `git fetch` first, examine what + you will be merging and then `git merge` locally with this + option). + <commit>...:: Commits, usually other branch heads, to merge into our branch. Specifying more than one commit will create a merge with diff --git a/builtin/merge.c b/builtin/merge.c index 101ffeff4..e3db41b77 100644 --- a/builtin/merge.c +++ b/builtin/merge.c @@ -64,6 +64,7 @@ static int option_renormalize; static int verbosity; static int allow_rerere_auto; static int abort_current_merge; +static int allow_unrelated_histories; static int show_progress = -1; static int default_to_upstream = 1; static const char *sign_commit; @@ -221,6 +222,8 @@ static struct option builtin_merge_options[] = { OPT__VERBOSITY(&verbosity), OPT_BOOL(0, "abort", &abort_current_merge, N_("abort the current in-progress merge")), + OPT_BOOL(0, "allow-unrelated-histories", &allow_unrelated_histories, + N_("allow merging unrelated histories")), OPT_SET_INT(0, "progress", &show_progress, N_("force progress reporting"), 1), { OPTION_STRING, 'S', "gpg-sign", &sign_commit, N_("key-id"), N_("GPG sign commit"), PARSE_OPT_OPTARG, NULL, (intptr_t) "" }, @@ -1397,9 +1400,12 @@ int cmd_merge(int argc, const char **argv, const char *prefix) update_ref("updating ORIG_HEAD", "ORIG_HEAD", head_commit->object.oid.hash, NULL, 0, UPDATE_REFS_DIE_ON_ERR); - if (remoteheads && !common) - ; /* No common ancestors found. We need a real merge. */ - else if (!remoteheads || + if (remoteheads && !common) { + /* No common ancestors found. */ + if (!allow_unrelated_histories) + die(_("refusing to merge unrelated histories")); + /* otherwise, we need a real merge. */ + } else if (!remoteheads || (!remoteheads->next && !common->next && common->item == remoteheads->item)) { /* diff --git a/t/t3033-merge-toplevel.sh b/t/t3033-merge-toplevel.sh index 46aadc410..c1379b00c 100755 --- a/t/t3033-merge-toplevel.sh +++ b/t/t3033-merge-toplevel.sh @@ -19,6 +19,8 @@ test_expect_success setup ' test_commit three && git checkout right && test_commit four && + git checkout --orphan five && + test_commit five && git checkout master ' @@ -133,4 +135,18 @@ test_expect_success 'merge FETCH_HEAD octopus non-fast-forward' ' test_cmp expect actual ' +# two-project merge +test_expect_success 'refuse two-project merge by default' ' + t3033_reset && + git reset --hard four && + test_must_fail git merge five +' + +test_expect_success 'two-project merge with --allow-unrelated-histories' ' + t3033_reset && + git reset --hard four && + git merge --allow-unrelated-histories five && + git diff --exit-code five +' + test_done diff --git a/t/t3412-rebase-root.sh b/t/t3412-rebase-root.sh index 0b5210572..73a39f292 100755 --- a/t/t3412-rebase-root.sh +++ b/t/t3412-rebase-root.sh @@ -133,7 +133,7 @@ test_expect_success 'set up second root and merge' ' rm A B C && test_commit 6 D && git checkout other && - git merge third + git merge --allow-unrelated-histories third ' cat > expect-third <<'EOF' diff --git a/t/t5500-fetch-pack.sh b/t/t5500-fetch-pack.sh index 3a9b77576..256958023 100755 --- a/t/t5500-fetch-pack.sh +++ b/t/t5500-fetch-pack.sh @@ -259,7 +259,8 @@ test_expect_success 'clone shallow object count' ' test_expect_success 'pull in shallow repo with missing merge base' ' ( cd shallow && - test_must_fail git pull --depth 4 .. A + git fetch --depth 4 .. A + test_must_fail git merge --allow-unrelated-histories FETCH_HEAD ) ' @@ -279,9 +280,10 @@ test_expect_success 'clone shallow depth count' ' test_expect_success 'clone shallow object count' ' ( cd shallow && + git prune && git count-objects -v ) > count.shallow && - grep "^count: 55" count.shallow + grep "^count: 54" count.shallow ' test_expect_success 'fetch --no-shallow on full repo' ' diff --git a/t/t6009-rev-list-parent.sh b/t/t6009-rev-list-parent.sh index 66cda17ef..20e3e2554 100755 --- a/t/t6009-rev-list-parent.sh +++ b/t/t6009-rev-list-parent.sh @@ -47,7 +47,9 @@ test_expect_success 'setup roots, merges and octopuses' ' git checkout -b yetanotherbranch four && test_commit eight && git checkout master && - test_merge normalmerge newroot && + test_tick && + git merge --allow-unrelated-histories -m normalmerge newroot && + git tag normalmerge && test_tick && git merge -m tripus sidebranch anotherbranch && git tag tripus && diff --git a/t/t6010-merge-base.sh b/t/t6010-merge-base.sh index 39b3238da..e0c5f44ca 100755 --- a/t/t6010-merge-base.sh +++ b/t/t6010-merge-base.sh @@ -215,11 +215,13 @@ test_expect_success 'criss-cross merge-base for octopus-step' ' git reset --hard E && test_commit CC2 && test_tick && - git merge -s ours CC1 && + # E is a root commit unrelated to MMR root on which CC1 is based + git merge -s ours --allow-unrelated-histories CC1 && test_commit CC-o && test_commit CCB && git reset --hard CC1 && - git merge -s ours CC2 && + # E is a root commit unrelated to MMR root on which CC1 is based + git merge -s ours --allow-unrelated-histories CC2 && test_commit CCA && git rev-parse CC1 CC2 >expected && diff --git a/t/t6012-rev-list-simplify.sh b/t/t6012-rev-list-simplify.sh index b89cd6b07..2a0fbb87b 100755 --- a/t/t6012-rev-list-simplify.sh +++ b/t/t6012-rev-list-simplify.sh @@ -71,7 +71,7 @@ test_expect_success setup ' note J && git checkout master && - test_tick && git merge -m "Coolest" unrelated && + test_tick && git merge --allow-unrelated-histories -m "Coolest" unrelated && note K && echo "Immaterial" >elif && diff --git a/t/t6026-merge-attr.sh b/t/t6026-merge-attr.sh index 04c0509c4..ef0cbceaf 100755 --- a/t/t6026-merge-attr.sh +++ b/t/t6026-merge-attr.sh @@ -176,7 +176,8 @@ test_expect_success 'up-to-date merge without common ancestor' ' test_tick && ( cd repo1 && - git pull ../repo2 master + git fetch ../repo2 master && + git merge --allow-unrelated-histories FETCH_HEAD ) ' diff --git a/t/t6029-merge-subtree.sh b/t/t6029-merge-subtree.sh index 73fc240e8..3e692454a 100755 --- a/t/t6029-merge-subtree.sh +++ b/t/t6029-merge-subtree.sh @@ -49,7 +49,7 @@ test_expect_success 'setup' ' test_expect_success 'initial merge' ' git remote add -f gui ../git-gui && - git merge -s ours --no-commit gui/master && + git merge -s ours --no-commit --allow-unrelated-histories gui/master && git read-tree --prefix=git-gui/ -u gui/master && git commit -m "Merge git-gui as our subdirectory" && git checkout -b work && diff --git a/t/t6101-rev-parse-parents.sh b/t/t6101-rev-parse-parents.sh index 10b145276..1c6952d04 100755 --- a/t/t6101-rev-parse-parents.sh +++ b/t/t6101-rev-parse-parents.sh @@ -19,7 +19,7 @@ test_expect_success 'setup' ' git checkout --orphan tmp && test_commit start2 && git checkout master && - git merge -m next start2 && + git merge -m next --allow-unrelated-histories start2 && test_commit final && test_seq 40 | diff --git a/t/t9400-git-cvsserver-server.sh b/t/t9400-git-cvsserver-server.sh index 6146c3fec..bc19811dd 100755 --- a/t/t9400-git-cvsserver-server.sh +++ b/t/t9400-git-cvsserver-server.sh @@ -45,7 +45,8 @@ test_expect_success 'setup' ' touch secondrootfile && git add secondrootfile && git commit -m "second root") && - git pull secondroot master && + git fetch secondroot master && + git merge --allow-unrelated-histories FETCH_HEAD && git clone -q --bare "$WORKDIR/.git" "$SERVERDIR" >/dev/null 2>&1 && GIT_DIR="$SERVERDIR" git config --bool gitcvs.enabled true && GIT_DIR="$SERVERDIR" git config gitcvs.logfile "$SERVERDIR/gitcvs.log" && |