git-branch(1) will error out if you give it a bad ref name. But the user
might not understand why or what part of the name is illegal.
The user might know that there are some limitations based on the *loose
ref* format (filenames), but there are also further rules for
easier integration with shell-based tools, pathname expansion, and
playing well with reference name expressions.
The man page for git-check-ref-format(1) contains these rules. Let’s
advise about it since that is not a command that you just happen
upon. Also make this advise configurable since you might not want to be
reminded every time you make a little typo.
Signed-off-by: Kristoffer Haugsbakk <code@xxxxxxxxxxxxxxx>
---
Notes (series):
v2:
• Make the advise optional via configuration
• Propagate error properly with `die_message(…)` instead of `exit(1)`
• Flesh out commit message a bit
Documentation/config/advice.txt | 3 +++
advice.c | 1 +
advice.h | 1 +
branch.c | 8 ++++++--
builtin/branch.c | 8 ++++++--
t/t3200-branch.sh | 11 +++++++++++
6 files changed, 28 insertions(+), 4 deletions(-)
diff --git a/Documentation/config/advice.txt b/Documentation/config/advice.txt
index c7ea70f2e2e..552cfbcd48c 100644
--- a/Documentation/config/advice.txt
+++ b/Documentation/config/advice.txt
@@ -94,6 +94,9 @@ advice.*::
'pushNonFFCurrent', 'pushNonFFMatching', 'pushAlreadyExists',
'pushFetchFirst', 'pushNeedsForce', and 'pushRefNeedsUpdate'
simultaneously.
+ refSyntax::
+ Point the user towards the ref syntax documentation if
+ they give an invalid ref name.
resetNoRefresh::
Advice to consider using the `--no-refresh` option to
linkgit:git-reset[1] when the command takes more than 2 seconds
diff --git a/advice.c b/advice.c
index 6e9098ff089..550c2968908 100644
--- a/advice.c
+++ b/advice.c
@@ -68,6 +68,7 @@ static struct {
[ADVICE_PUSH_UNQUALIFIED_REF_NAME] = { "pushUnqualifiedRefName" },
[ADVICE_PUSH_UPDATE_REJECTED] = { "pushUpdateRejected" },
[ADVICE_PUSH_UPDATE_REJECTED_ALIAS] = { "pushNonFastForward" }, /* backwards compatibility */
+ [ADVICE_REF_SYNTAX] = { "refSyntax" },
[ADVICE_RESET_NO_REFRESH_WARNING] = { "resetNoRefresh" },
[ADVICE_RESOLVE_CONFLICT] = { "resolveConflict" },
[ADVICE_RM_HINTS] = { "rmHints" },
diff --git a/advice.h b/advice.h
index 9d4f49ae38b..d15fe2351ab 100644
--- a/advice.h
+++ b/advice.h
@@ -36,6 +36,7 @@ enum advice_type {
ADVICE_PUSH_UNQUALIFIED_REF_NAME,
ADVICE_PUSH_UPDATE_REJECTED,
ADVICE_PUSH_UPDATE_REJECTED_ALIAS,
+ ADVICE_REF_SYNTAX,
ADVICE_RESET_NO_REFRESH_WARNING,
ADVICE_RESOLVE_CONFLICT,
ADVICE_RM_HINTS,
diff --git a/branch.c b/branch.c
index 6719a181bd1..621019fcf4b 100644
--- a/branch.c
+++ b/branch.c
@@ -370,8 +370,12 @@ int read_branch_desc(struct strbuf *buf, const char *branch_name)
*/
int validate_branchname(const char *name, struct strbuf *ref)
{
- if (strbuf_check_branch_ref(ref, name))
- die(_("'%s' is not a valid branch name"), name);
+ if (strbuf_check_branch_ref(ref, name)) {
+ int code = die_message(_("'%s' is not a valid branch name"), name);
+ advise_if_enabled(ADVICE_REF_SYNTAX,
+ _("See `man git check-ref-format`"));
+ exit(code);
+ }
return ref_exists(ref->buf);
}
diff --git a/builtin/branch.c b/builtin/branch.c
index cfb63cce5fb..1c122ee8a7b 100644
--- a/builtin/branch.c
+++ b/builtin/branch.c
@@ -576,8 +576,12 @@ static void copy_or_rename_branch(const char *oldname, const char *newname, int
*/
if (ref_exists(oldref.buf))
recovery = 1;
- else
- die(_("invalid branch name: '%s'"), oldname);
+ else {
+ int code = die_message(_("invalid branch name: '%s'"), oldname);
+ advise_if_enabled(ADVICE_REF_SYNTAX,
+ _("See `man git check-ref-format`"));
+ exit(code);
+ }
}
for (int i = 0; worktrees[i]; i++) {
diff --git a/t/t3200-branch.sh b/t/t3200-branch.sh
index de7d3014e4f..d21fdf09c90 100755
--- a/t/t3200-branch.sh
+++ b/t/t3200-branch.sh
@@ -1725,4 +1725,15 @@ test_expect_success '--track overrides branch.autoSetupMerge' '
test_cmp_config "" --default "" branch.foo5.merge
'
+cat <<\EOF >expect
+fatal: 'foo..bar' is not a valid branch name
+hint: See `man git check-ref-format`
+hint: Disable this message with "git config advice.refSyntax false"
+EOF
+
+test_expect_success 'errors if given a bad branch name' '
+ test_must_fail git branch foo..bar >actual 2>&1 &&
+ test_cmp expect actual
+'
+
test_done
--
2.44.0.64.g52b67adbeb2
