From: Kyle Zhao <kylezhao@xxxxxxxxxxx>
The previous commit added a `--merge-base` option in order to allow
using a specified merge-base for the merge. Extend the input accepted
by `--stdin` to also allow a specified merge-base with each merge
requested. For example:
printf "<b3> -- <b1> <b2>" | git merge-tree --stdin
does a merge of b1 and b2, and uses b3 as the merge-base.
Signed-off-by: Kyle Zhao <kylezhao@xxxxxxxxxxx>
---
Documentation/git-merge-tree.txt | 14 ++++++++++++-
builtin/merge-tree.c | 21 +++++++++++++++++--
t/t4301-merge-tree-write-tree.sh | 35 ++++++++++++++++++++++++++++++++
3 files changed, 67 insertions(+), 3 deletions(-)
diff --git a/Documentation/git-merge-tree.txt b/Documentation/git-merge-tree.txt
index d9dacb2ce54..298c133fdb6 100644
--- a/Documentation/git-merge-tree.txt
+++ b/Documentation/git-merge-tree.txt
@@ -66,7 +66,8 @@ OPTIONS
--merge-base=<commit>::
Instead of finding the merge-bases for <branch1> and <branch2>,
- specify a merge-base for the merge.
+ specify a merge-base for the merge. This option is incompatible
+ with `--stdin`.
[[OUTPUT]]
OUTPUT
@@ -220,6 +221,17 @@ with linkgit:git-merge[1]:
* any messages that would have been printed to stdout (the
<<IM,Informational messages>>)
+INPUT FORMAT
+------------
+'git merge-tree --stdin' input format is fully text based. Each line
+has this format:
+
+ [<base-commit> -- ]<branch1> <branch2>
+
+If one line is separated by `--`, the string before the separator is
+used for specifying a merge-base for the merge and the string after
+the separator describes the branches to be merged.
+
MISTAKES TO AVOID
-----------------
diff --git a/builtin/merge-tree.c b/builtin/merge-tree.c
index 62c6d43cdb9..330f779e8bc 100644
--- a/builtin/merge-tree.c
+++ b/builtin/merge-tree.c
@@ -557,12 +557,29 @@ int cmd_merge_tree(int argc, const char **argv, const char *prefix)
while (strbuf_getline_lf(&buf, stdin) != EOF) {
struct strbuf **split;
int result;
+ const char *input_merge_base = NULL;
split = strbuf_split(&buf, ' ');
- if (!split[0] || !split[1] || split[2])
+ if (!split[0] || !split[1])
die(_("malformed input line: '%s'."), buf.buf);
strbuf_rtrim(split[0]);
- result = real_merge(&o, merge_base, split[0]->buf, split[1]->buf, prefix);
+ strbuf_rtrim(split[1]);
+
+ /* parse the merge-base */
+ if (!strcmp(split[1]->buf, "--")) {
+ input_merge_base = split[0]->buf;
+ }
+
+ if (input_merge_base && split[2] && split[3] && !split[4]) {
+ strbuf_rtrim(split[2]);
+ strbuf_rtrim(split[3]);
+ result = real_merge(&o, input_merge_base, split[2]->buf, split[3]->buf, prefix);
+ } else if (!input_merge_base && !split[2]) {
+ result = real_merge(&o, NULL, split[0]->buf, split[1]->buf, prefix);
+ } else {
+ die(_("malformed input line: '%s'."), buf.buf);
+ }
+
if (result < 0)
die(_("merging cannot continue; got unclean result of %d"), result);
strbuf_list_free(split);
diff --git a/t/t4301-merge-tree-write-tree.sh b/t/t4301-merge-tree-write-tree.sh
index 6db96ccbaae..a8983a0edcb 100755
--- a/t/t4301-merge-tree-write-tree.sh
+++ b/t/t4301-merge-tree-write-tree.sh
@@ -860,6 +860,13 @@ test_expect_success '--stdin with both a successful and a conflicted merge' '
test_cmp expect actual
'
+
+test_expect_success '--merge-base is incompatible with --stdin' '
+ test_must_fail git merge-tree --merge-base=side1 --stdin 2>expect &&
+
+ grep "^fatal: --merge-base is incompatible with --stdin" expect
+'
+
# specify merge-base as parent of branch2
# git merge-tree --write-tree --merge-base=c2 c1 c3
# Commit c1: add file1
@@ -887,4 +894,32 @@ test_expect_success 'specify merge-base as parent of branch2' '
test_cmp expect actual
'
+# Since the earlier tests have verified that individual merge-tree calls
+# are doing the right thing, this test case is only used to verify that
+# we can also trigger merges via --stdin, and that when we do we get
+# the same answer as running a bunch of separate merges.
+
+test_expect_success 'check the input format when --stdin is passed' '
+ test_when_finished "rm -rf repo" &&
+ git init repo &&
+ test_commit -C repo c1 &&
+ test_commit -C repo c2 &&
+ test_commit -C repo c3 &&
+ printf "c1 c3\nc2 -- c1 c3\nc2 c3" | git -C repo merge-tree --stdin >actual &&
+
+ printf "1\0" >expect &&
+ git -C repo merge-tree --write-tree -z c1 c3 >>expect &&
+ printf "\0" >>expect &&
+
+ printf "1\0" >>expect &&
+ git -C repo merge-tree --write-tree -z --merge-base=c2 c1 c3 >>expect &&
+ printf "\0" >>expect &&
+
+ printf "1\0" >>expect &&
+ git -C repo merge-tree --write-tree -z c2 c3 >>expect &&
+ printf "\0" >>expect &&
+
+ test_cmp expect actual
+'
+
test_done
--
gitgitgadget
