diff options
| -rw-r--r-- | Documentation/git-diff-index.txt | 9 | ||||
| -rw-r--r-- | Documentation/git-diff-tree.txt | 7 | ||||
| -rw-r--r-- | Documentation/git-diff.txt | 36 | ||||
| -rw-r--r-- | builtin/diff-index.c | 10 | ||||
| -rw-r--r-- | builtin/diff-tree.c | 17 | ||||
| -rw-r--r-- | builtin/diff.c | 49 | ||||
| -rw-r--r-- | contrib/completion/git-completion.bash | 15 | ||||
| -rw-r--r-- | diff-lib.c | 63 | ||||
| -rw-r--r-- | diff.h | 7 | ||||
| -rwxr-xr-x | t/t4068-diff-symmetric-merge-base.sh | 193 | ||||
| -rwxr-xr-x | t/t4068-diff-symmetric.sh | 91 |
11 files changed, 356 insertions, 141 deletions
diff --git a/Documentation/git-diff-index.txt b/Documentation/git-diff-index.txt index f4bd8155c0..27acb31cbf 100644 --- a/Documentation/git-diff-index.txt +++ b/Documentation/git-diff-index.txt @@ -9,7 +9,7 @@ git-diff-index - Compare a tree to the working tree or index SYNOPSIS -------- [verse] -'git diff-index' [-m] [--cached] [<common diff options>] <tree-ish> [<path>...] +'git diff-index' [-m] [--cached] [--merge-base] [<common diff options>] <tree-ish> [<path>...] DESCRIPTION ----------- @@ -27,7 +27,12 @@ include::diff-options.txt[] The id of a tree object to diff against. --cached:: - do not consider the on-disk file at all + Do not consider the on-disk file at all. + +--merge-base:: + Instead of comparing <tree-ish> directly, use the merge base + between <tree-ish> and HEAD instead. <tree-ish> must be a + commit. -m:: By default, files recorded in the index but not checked diff --git a/Documentation/git-diff-tree.txt b/Documentation/git-diff-tree.txt index 5c8a2a5e97..2fc24c542f 100644 --- a/Documentation/git-diff-tree.txt +++ b/Documentation/git-diff-tree.txt @@ -10,7 +10,7 @@ SYNOPSIS -------- [verse] 'git diff-tree' [--stdin] [-m] [-s] [-v] [--no-commit-id] [--pretty] - [-t] [-r] [-c | --cc] [--combined-all-paths] [--root] + [-t] [-r] [-c | --cc] [--combined-all-paths] [--root] [--merge-base] [<common diff options>] <tree-ish> [<tree-ish>] [<path>...] DESCRIPTION @@ -43,6 +43,11 @@ include::diff-options.txt[] When `--root` is specified the initial commit will be shown as a big creation event. This is equivalent to a diff against the NULL tree. +--merge-base:: + Instead of comparing the <tree-ish>s directly, use the merge + base between the two <tree-ish>s as the "before" side. There + must be two <tree-ish>s given and they must both be commits. + --stdin:: When `--stdin` is specified, the command does not take <tree-ish> arguments from the command line. Instead, it diff --git a/Documentation/git-diff.txt b/Documentation/git-diff.txt index 727f24d16e..7f4c8a8ce7 100644 --- a/Documentation/git-diff.txt +++ b/Documentation/git-diff.txt @@ -10,8 +10,8 @@ SYNOPSIS -------- [verse] 'git diff' [<options>] [<commit>] [--] [<path>...] -'git diff' [<options>] --cached [<commit>] [--] [<path>...] -'git diff' [<options>] <commit> [<commit>...] <commit> [--] [<path>...] +'git diff' [<options>] --cached [--merge-base] [<commit>] [--] [<path>...] +'git diff' [<options>] [--merge-base] <commit> [<commit>...] <commit> [--] [<path>...] 'git diff' [<options>] <commit>...<commit> [--] [<path>...] 'git diff' [<options>] <blob> <blob> 'git diff' [<options>] --no-index [--] <path> <path> @@ -40,7 +40,7 @@ files on disk. or when running the command outside a working tree controlled by Git. This form implies `--exit-code`. -'git diff' [<options>] --cached [<commit>] [--] [<path>...]:: +'git diff' [<options>] --cached [--merge-base] [<commit>] [--] [<path>...]:: This form is to view the changes you staged for the next commit relative to the named <commit>. Typically you @@ -49,6 +49,10 @@ files on disk. If HEAD does not exist (e.g. unborn branches) and <commit> is not given, it shows all staged changes. --staged is a synonym of --cached. ++ +If --merge-base is given, instead of using <commit>, use the merge base +of <commit> and HEAD. `git diff --merge-base A` is equivalent to +`git diff $(git merge-base A HEAD)`. 'git diff' [<options>] <commit> [--] [<path>...]:: @@ -58,23 +62,27 @@ files on disk. branch name to compare with the tip of a different branch. -'git diff' [<options>] <commit> <commit> [--] [<path>...]:: +'git diff' [<options>] [--merge-base] <commit> <commit> [--] [<path>...]:: This is to view the changes between two arbitrary <commit>. ++ +If --merge-base is given, use the merge base of the two commits for the +"before" side. `git diff --merge-base A B` is equivalent to +`git diff $(git merge-base A B) B`. 'git diff' [<options>] <commit> <commit>... <commit> [--] [<path>...]:: This form is to view the results of a merge commit. The first listed <commit> must be the merge itself; the remaining two or more commits should be its parents. A convenient way to produce - the desired set of revisions is to use the {caret}@ suffix. + the desired set of revisions is to use the `^@` suffix. For instance, if `master` names a merge commit, `git diff master master^@` gives the same combined diff as `git show master`. 'git diff' [<options>] <commit>..<commit> [--] [<path>...]:: - This is synonymous to the earlier form (without the "..") for + This is synonymous to the earlier form (without the `..`) for viewing the changes between two arbitrary <commit>. If <commit> on one side is omitted, it will have the same effect as using HEAD instead. @@ -83,20 +91,20 @@ files on disk. This form is to view the changes on the branch containing and up to the second <commit>, starting at a common ancestor - of both <commit>. "git diff A\...B" is equivalent to - "git diff $(git merge-base A B) B". You can omit any one + of both <commit>. `git diff A...B` is equivalent to + `git diff $(git merge-base A B) B`. You can omit any one of <commit>, which has the same effect as using HEAD instead. Just in case you are doing something exotic, it should be noted that all of the <commit> in the above description, except -in the last two forms that use ".." notations, can be any -<tree>. +in the `--merge-base` case and in the last two forms that use `..` +notations, can be any <tree>. For a more complete list of ways to spell <commit>, see "SPECIFYING REVISIONS" section in linkgit:gitrevisions[7]. However, "diff" is about comparing two _endpoints_, not ranges, -and the range notations ("<commit>..<commit>" and -"<commit>\...<commit>") do not mean a range as defined in the +and the range notations (`<commit>..<commit>` and +`<commit>...<commit>`) do not mean a range as defined in the "SPECIFYING RANGES" section in linkgit:gitrevisions[7]. 'git diff' [<options>] <blob> <blob>:: @@ -144,9 +152,9 @@ $ git diff HEAD <3> + <1> Changes in the working tree not yet staged for the next commit. <2> Changes between the index and your last commit; what you - would be committing if you run "git commit" without "-a" option. + would be committing if you run `git commit` without `-a` option. <3> Changes in the working tree since your last commit; what you - would be committing if you run "git commit -a" + would be committing if you run `git commit -a` Comparing with arbitrary commits:: + diff --git a/builtin/diff-index.c b/builtin/diff-index.c index 93ec642423..7f5281c461 100644 --- a/builtin/diff-index.c +++ b/builtin/diff-index.c @@ -15,7 +15,7 @@ COMMON_DIFF_OPTIONS_HELP; int cmd_diff_index(int argc, const char **argv, const char *prefix) { struct rev_info rev; - int cached = 0; + unsigned int option = 0; int i; int result; @@ -32,7 +32,9 @@ int cmd_diff_index(int argc, const char **argv, const char *prefix) const char *arg = argv[i]; if (!strcmp(arg, "--cached")) - cached = 1; + option |= DIFF_INDEX_CACHED; + else if (!strcmp(arg, "--merge-base")) + option |= DIFF_INDEX_MERGE_BASE; else usage(diff_cache_usage); } @@ -46,7 +48,7 @@ int cmd_diff_index(int argc, const char **argv, const char *prefix) if (rev.pending.nr != 1 || rev.max_count != -1 || rev.min_age != -1 || rev.max_age != -1) usage(diff_cache_usage); - if (!cached) { + if (!(option & DIFF_INDEX_CACHED)) { setup_work_tree(); if (read_cache_preload(&rev.diffopt.pathspec) < 0) { perror("read_cache_preload"); @@ -56,7 +58,7 @@ int cmd_diff_index(int argc, const char **argv, const char *prefix) perror("read_cache"); return -1; } - result = run_diff_index(&rev, cached); + result = run_diff_index(&rev, option); UNLEAK(rev); return diff_result_code(&rev.diffopt, result); } diff --git a/builtin/diff-tree.c b/builtin/diff-tree.c index 802363d0a2..9fc95e959f 100644 --- a/builtin/diff-tree.c +++ b/builtin/diff-tree.c @@ -111,6 +111,7 @@ int cmd_diff_tree(int argc, const char **argv, const char *prefix) struct setup_revision_opt s_r_opt; struct userformat_want w; int read_stdin = 0; + int merge_base = 0; if (argc == 2 && !strcmp(argv[1], "-h")) usage(diff_tree_usage); @@ -143,9 +144,18 @@ int cmd_diff_tree(int argc, const char **argv, const char *prefix) read_stdin = 1; continue; } + if (!strcmp(arg, "--merge-base")) { + merge_base = 1; + continue; + } usage(diff_tree_usage); } + if (read_stdin && merge_base) + die(_("--stdin and --merge-base are mutually exclusive")); + if (merge_base && opt->pending.nr != 2) + die(_("--merge-base only works with two commits")); + /* * NOTE! We expect "a..b" to expand to "^a b" but it is * perfectly valid for revision range parser to yield "b ^a", @@ -165,7 +175,12 @@ int cmd_diff_tree(int argc, const char **argv, const char *prefix) case 2: tree1 = opt->pending.objects[0].item; tree2 = opt->pending.objects[1].item; - if (tree2->flags & UNINTERESTING) { + if (merge_base) { + struct object_id oid; + + diff_get_merge_base(opt, &oid); + tree1 = lookup_object(the_repository, &oid); + } else if (tree2->flags & UNINTERESTING) { SWAP(tree2, tree1); } diff_tree_oid(&tree1->oid, &tree2->oid, "", &opt->diffopt); diff --git a/builtin/diff.c b/builtin/diff.c index cd4083fed9..780c33877f 100644 --- a/builtin/diff.c +++ b/builtin/diff.c @@ -26,7 +26,7 @@ static const char builtin_diff_usage[] = "git diff [<options>] [<commit>] [--] [<path>...]\n" " or: git diff [<options>] --cached [<commit>] [--] [<path>...]\n" -" or: git diff [<options>] <commit> [<commit>...] <commit> [--] [<path>...]\n" +" or: git diff [<options>] <commit> [--merge-base] [<commit>...] <commit> [--] [<path>...]\n" " or: git diff [<options>] <commit>...<commit>] [--] [<path>...]\n" " or: git diff [<options>] <blob> <blob>]\n" " or: git diff [<options>] --no-index [--] <path> <path>]\n" @@ -134,11 +134,13 @@ static int builtin_diff_blobs(struct rev_info *revs, static int builtin_diff_index(struct rev_info *revs, int argc, const char **argv) { - int cached = 0; + unsigned int option = 0; while (1 < argc) { const char *arg = argv[1]; if (!strcmp(arg, "--cached") || !strcmp(arg, "--staged")) - cached = 1; + option |= DIFF_INDEX_CACHED; + else if (!strcmp(arg, "--merge-base")) + option |= DIFF_INDEX_MERGE_BASE; else usage(builtin_diff_usage); argv++; argc--; @@ -151,7 +153,7 @@ static int builtin_diff_index(struct rev_info *revs, revs->max_count != -1 || revs->min_age != -1 || revs->max_age != -1) usage(builtin_diff_usage); - if (!cached) { + if (!(option & DIFF_INDEX_CACHED)) { setup_work_tree(); if (read_cache_preload(&revs->diffopt.pathspec) < 0) { perror("read_cache_preload"); @@ -161,7 +163,7 @@ static int builtin_diff_index(struct rev_info *revs, perror("read_cache"); return -1; } - return run_diff_index(revs, cached); + return run_diff_index(revs, option); } static int builtin_diff_tree(struct rev_info *revs, @@ -170,19 +172,34 @@ static int builtin_diff_tree(struct rev_info *revs, struct object_array_entry *ent1) { const struct object_id *(oid[2]); - int swap = 0; + struct object_id mb_oid; + int merge_base = 0; - if (argc > 1) - usage(builtin_diff_usage); + while (1 < argc) { + const char *arg = argv[1]; + if (!strcmp(arg, "--merge-base")) + merge_base = 1; + else + usage(builtin_diff_usage); + argv++; argc--; + } - /* - * We saw two trees, ent0 and ent1. If ent1 is uninteresting, - * swap them. - */ - if (ent1->item->flags & UNINTERESTING) - swap = 1; - oid[swap] = &ent0->item->oid; - oid[1 - swap] = &ent1->item->oid; + if (merge_base) { + diff_get_merge_base(revs, &mb_oid); + oid[0] = &mb_oid; + oid[1] = &revs->pending.objects[1].item->oid; + } else { + int swap = 0; + + /* + * We saw two trees, ent0 and ent1. If ent1 is uninteresting, + * swap them. + */ + if (ent1->item->flags & UNINTERESTING) + swap = 1; + oid[swap] = &ent0->item->oid; + oid[1 - swap] = &ent1->item->oid; + } diff_tree_oid(oid[0], oid[1], "", &revs->diffopt); log_tree_diff_flush(revs); return 0; diff --git a/contrib/completion/git-completion.bash b/contrib/completion/git-completion.bash index aea30d74a0..36f5a91c7a 100644 --- a/contrib/completion/git-completion.bash +++ b/contrib/completion/git-completion.bash @@ -1698,6 +1698,10 @@ __git_diff_common_options="--stat --numstat --shortstat --summary --patch --no-patch " +__git_diff_difftool_options="--cached --staged --pickaxe-all --pickaxe-regex + --base --ours --theirs --no-index --relative --merge-base + $__git_diff_common_options" + _git_diff () { __git_has_doubledash && return @@ -1720,10 +1724,7 @@ _git_diff () return ;; --*) - __gitcomp "--cached --staged --pickaxe-all --pickaxe-regex - --base --ours --theirs --no-index - $__git_diff_common_options - " + __gitcomp "$__git_diff_difftool_options" return ;; esac @@ -1745,11 +1746,7 @@ _git_difftool () return ;; --*) - __gitcomp_builtin difftool "$__git_diff_common_options - --base --cached --ours --theirs - --pickaxe-all --pickaxe-regex - --relative --staged - " + __gitcomp_builtin difftool "$__git_diff_difftool_options" return ;; esac diff --git a/diff-lib.c b/diff-lib.c index f95c6de75f..d18a118249 100644 --- a/diff-lib.c +++ b/diff-lib.c @@ -13,6 +13,7 @@ #include "submodule.h" #include "dir.h" #include "fsmonitor.h" +#include "commit-reach.h" /* * diff-files @@ -510,16 +511,74 @@ static int diff_cache(struct rev_info *revs, return unpack_trees(1, &t, &opts); } -int run_diff_index(struct rev_info *revs, int cached) +void diff_get_merge_base(const struct rev_info *revs, struct object_id *mb) +{ + int i; + struct commit *mb_child[2] = {0}; + struct commit_list *merge_bases; + + for (i = 0; i < revs->pending.nr; i++) { + struct object *obj = revs->pending.objects[i].item; + if (obj->flags) + die(_("--merge-base does not work with ranges")); + if (obj->type != OBJ_COMMIT) + die(_("--merge-base only works with commits")); + } + + /* + * This check must go after the for loop above because A...B + * ranges produce three pending commits, resulting in a + * misleading error message. + */ + if (revs->pending.nr < 1 || revs->pending.nr > 2) + BUG("unexpected revs->pending.nr: %d", revs->pending.nr); + + for (i = 0; i < revs->pending.nr; i++) + mb_child[i] = lookup_commit_reference(the_repository, &revs->pending.objects[i].item->oid); + if (revs->pending.nr == 1) { + struct object_id oid; + + if (get_oid("HEAD", &oid)) + die(_("unable to get HEAD")); + + mb_child[1] = lookup_commit_reference(the_repository, &oid); + } + + merge_bases = repo_get_merge_bases(the_repository, mb_child[0], mb_child[1]); + if (!merge_bases) + die(_("no merge base found")); + if (merge_bases->next) + die(_("multiple merge bases found")); + + oidcpy(mb, &merge_bases->item->object.oid); + + free_commit_list(merge_bases); +} + +int run_diff_index(struct rev_info *revs, unsigned int option) { struct object_array_entry *ent; + int cached = !!(option & DIFF_INDEX_CACHED); + int merge_base = !!(option & DIFF_INDEX_MERGE_BASE); + struct object_id oid; + const char *name; + char merge_base_hex[GIT_MAX_HEXSZ + 1]; if (revs->pending.nr != 1) BUG("run_diff_index must be passed exactly one tree"); trace_performance_enter(); ent = revs->pending.objects; - if (diff_cache(revs, &ent->item->oid, ent->name, cached)) + + if (merge_base) { + diff_get_merge_base(revs, &oid); + name = oid_to_hex_r(merge_base_hex, &oid); + } else { + oidcpy(&oid, &ent->item->oid); + name = ent->name; + } + + if (diff_cache(revs, &oid, name, cached)) exit(128); diff_set_mnemonic_prefix(&revs->diffopt, "c/", cached ? "i/" : "w/"); @@ -578,12 +578,17 @@ void diff_warn_rename_limit(const char *varname, int needed, int degraded_cc); */ const char *diff_aligned_abbrev(const struct object_id *sha1, int); +void diff_get_merge_base(const struct rev_info *revs, struct object_id *mb); + /* do not report anything on removed paths */ #define DIFF_SILENT_ON_REMOVED 01 /* report racily-clean paths as modified */ #define DIFF_RACY_IS_MODIFIED 02 int run_diff_files(struct rev_info *revs, unsigned int option); -int run_diff_index(struct rev_info *revs, int cached); + +#define DIFF_INDEX_CACHED 01 +#define DIFF_INDEX_MERGE_BASE 02 +int run_diff_index(struct rev_info *revs, unsigned int option); int do_diff_cache(const struct object_id *, struct diff_options *); int diff_flush_patch_id(struct diff_options *, struct object_id *, int, int); diff --git a/t/t4068-diff-symmetric-merge-base.sh b/t/t4068-diff-symmetric-merge-base.sh new file mode 100755 index 0000000000..03487cc945 --- /dev/null +++ b/t/t4068-diff-symmetric-merge-base.sh @@ -0,0 +1,193 @@ +#!/bin/sh + +test_description='behavior of diff with symmetric-diff setups and --merge-base' + +. ./test-lib.sh + +# build these situations: +# - normal merge with one merge base (br1...b2r); +# - criss-cross merge ie 2 merge bases (br1...master); +# - disjoint subgraph (orphan branch, br3...master). +# +# B---E <-- master +# / \ / +# A X +# \ / \ +# C---D--G <-- br1 +# \ / +# ---F <-- br2 +# +# H <-- br3 +# +# We put files into a few commits so that we can verify the +# output as well. + +test_expect_success setup ' + git commit --allow-empty -m A && + echo b >b && + git add b && + git commit -m B && + git checkout -b br1 HEAD^ && + echo c >c && + git add c && + git commit -m C && + git tag commit-C && + git merge -m D master && + git tag commit-D && + git checkout master && + git merge -m E commit-C && + git checkout -b br2 commit-C && + echo f >f && + git add f && + git commit -m F && + git checkout br1 && + git merge -m G br2 && + git checkout --orphan br3 && + git commit -m H +' + +test_expect_success 'diff with one merge base' ' + git diff commit-D...br1 >tmp && + tail -n 1 tmp >actual && + echo +f >expect && + test_cmp expect actual +' + +# The output (in tmp) can have +b or +c depending +# on which merge base (commit B or C) is picked. +# It should have one of those two, which comes out +# to seven lines. +test_expect_success 'diff with two merge bases' ' + git diff br1...master >tmp 2>err && + test_line_count = 7 tmp && + test_line_count = 1 err +' + +test_expect_success 'diff with no merge bases' ' + test_must_fail git diff br2...br3 2>err && + test_i18ngrep "fatal: br2...br3: no merge base" err +' + +test_expect_success 'diff with too many symmetric differences' ' + test_must_fail git diff br1...master br2...br3 2>err && + test_i18ngrep "usage" err +' + +test_expect_success 'diff with symmetric difference and extraneous arg' ' + test_must_fail git diff master br1...master 2>err && + test_i18ngrep "usage" err +' + +test_expect_success 'diff with two ranges' ' + test_must_fail git diff master br1..master br2..br3 2>err && + test_i18ngrep "usage" err +' + +test_expect_success 'diff with ranges and extra arg' ' + test_must_fail git diff master br1..master commit-D 2>err && + test_i18ngrep "usage" err +' + +test_expect_success 'diff --merge-base with no commits' ' + test_must_fail git diff --merge-base +' + +test_expect_success 'diff --merge-base with three commits' ' + test_must_fail git diff --merge-base br1 br2 master 2>err && + test_i18ngrep "usage" err +' + +for cmd in diff-index diff +do + test_expect_success "$cmd --merge-base with one commit" ' + git checkout master && + git $cmd commit-C >expect && + git $cmd --merge-base br2 >actual && + test_cmp expect actual + ' + + test_expect_success "$cmd --merge-base with one commit and unstaged changes" ' + git checkout master && + test_when_finished git reset --hard && + echo unstaged >>c && + git $cmd commit-C >expect && + git $cmd --merge-base br2 >actual && + test_cmp expect actual + ' + + test_expect_success "$cmd --merge-base with one commit and staged and unstaged changes" ' + git checkout master && + test_when_finished git reset --hard && + echo staged >>c && + git add c && + echo unstaged >>c && + git $cmd commit-C >expect && + git $cmd --merge-base br2 >actual && + test_cmp expect actual + ' + + test_expect_success "$cmd --merge-base --cached with one commit and staged and unstaged changes" ' + git checkout master && + test_when_finished git reset --hard && + echo staged >>c && + git add c && + echo unstaged >>c && + git $cmd --cached commit-C >expect && + git $cmd --cached --merge-base br2 >actual && + test_cmp expect actual + ' + + test_expect_success "$cmd --merge-base with non-commit" ' + git checkout master && + test_must_fail git $cmd --merge-base master^{tree} 2>err && + test_i18ngrep "fatal: --merge-base only works with commits" err + ' + + test_expect_success "$cmd --merge-base with no merge bases and one commit" ' + git checkout master && + test_must_fail git $cmd --merge-base br3 2>err && + test_i18ngrep "fatal: no merge base found" err + ' + + test_expect_success "$cmd --merge-base with multiple merge bases and one commit" ' + git checkout master && + test_must_fail git $cmd --merge-base br1 2>err && + test_i18ngrep "fatal: multiple merge bases found" err + ' +done + +for cmd in diff-tree diff +do + test_expect_success "$cmd --merge-base with two commits" ' + git $cmd commit-C master >expect && + git $cmd --merge-base br2 master >actual && + test_cmp expect actual + ' + + test_expect_success "$cmd --merge-base commit and non-commit" ' + test_must_fail git $cmd --merge-base br2 master^{tree} 2>err && + test_i18ngrep "fatal: --merge-base only works with commits" err + ' + + test_expect_success "$cmd --merge-base with no merge bases and two commits" ' + test_must_fail git $cmd --merge-base br2 br3 2>err && + test_i18ngrep "fatal: no merge base found" err + ' + + test_expect_success "$cmd --merge-base with multiple merge bases and two commits" ' + test_must_fail git $cmd --merge-base master br1 2>err && + test_i18ngrep "fatal: multiple merge bases found" err + ' +done + +test_expect_success 'diff-tree --merge-base with one commit' ' + test_must_fail git diff-tree --merge-base master 2>err && + test_i18ngrep "fatal: --merge-base only works with two commits" err +' + +test_expect_success 'diff --merge-base with range' ' + test_must_fail git diff --merge-base br2..br3 2>err && + test_i18ngrep "fatal: --merge-base does not work with ranges" err +' + +test_done diff --git a/t/t4068-diff-symmetric.sh b/t/t4068-diff-symmetric.sh deleted file mode 100755 index 31d17a5af0..0000000000 --- a/t/t4068-diff-symmetric.sh +++ /dev/null @@ -1,91 +0,0 @@ -#!/bin/sh - -test_description='behavior of diff with symmetric-diff setups' - -. ./test-lib.sh - -# build these situations: -# - normal merge with one merge base (br1...b2r); -# - criss-cross merge ie 2 merge bases (br1...master); -# - disjoint subgraph (orphan branch, br3...master). -# -# B---E <-- master -# / \ / -# A X -# \ / \ -# C---D--G <-- br1 -# \ / -# ---F <-- br2 -# -# H <-- br3 -# -# We put files into a few commits so that we can verify the -# output as well. - -test_expect_success setup ' - git commit --allow-empty -m A && - echo b >b && - git add b && - git commit -m B && - git checkout -b br1 HEAD^ && - echo c >c && - git add c && - git commit -m C && - git tag commit-C && - git merge -m D master && - git tag commit-D && - git checkout master && - git merge -m E commit-C && - git checkout -b br2 commit-C && - echo f >f && - git add f && - git commit -m F && - git checkout br1 && - git merge -m G br2 && - git checkout --orphan br3 && - git commit -m H -' - -test_expect_success 'diff with one merge base' ' - git diff commit-D...br1 >tmp && - tail -n 1 tmp >actual && - echo +f >expect && - test_cmp expect actual -' - -# The output (in tmp) can have +b or +c depending -# on which merge base (commit B or C) is picked. -# It should have one of those two, which comes out -# to seven lines. -test_expect_success 'diff with two merge bases' ' - git diff br1...master >tmp 2>err && - test_line_count = 7 tmp && - test_line_count = 1 err -' - -test_expect_success 'diff with no merge bases' ' - test_must_fail git diff br2...br3 >tmp 2>err && - test_i18ngrep "fatal: br2...br3: no merge base" err -' - -test_expect_success 'diff with too many symmetric differences' ' - test_must_fail git diff br1...master br2...br3 >tmp 2>err && - test_i18ngrep "usage" err -' - -test_expect_success 'diff with symmetric difference and extraneous arg' ' - test_must_fail git diff master br1...master >tmp 2>err && - test_i18ngrep "usage" err -' - -test_expect_success 'diff with two ranges' ' - test_must_fail git diff master br1..master br2..br3 >tmp 2>err && - test_i18ngrep "usage" err -' - -test_expect_success 'diff with ranges and extra arg' ' - test_must_fail git diff master br1..master commit-D >tmp 2>err && - test_i18ngrep "usage" err -' - -test_done |