range-diff: fix a crash in parsing git-log output
`git range-diff` calls `git log` internally and tries to parse its
output. But `git log` output can be customized by the user in their
git config and for certain configurations either an error will be
returned by `git range-diff` or it will crash.
To fix this explicitly set the output format of the internally
executed `git log` with `--pretty=medium`. Because that cancels
`--notes`, add explicitly `--notes` at the end.
Also, make sure we never crash in the same way - trying to dereference
`util` which was never created and has remained NULL. It would happen
if the first line of `git log` output does not begin with 'commit '.
Alternative considered but discarded - somehow disable all git configs
and behave as if no config is present in the internally executed
`git log`, but that does not seem to be possible. GIT_CONFIG_NOSYSTEM
is the closest to it, but even with that we would still read
`.git/config`.
Signed-off-by: Vasil Dimov <vd@FreeBSD.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/range-diff.c b/range-diff.c
index f745567..5cc920b 100644
--- a/range-diff.c
+++ b/range-diff.c
@@ -63,6 +63,8 @@ static int read_patches(const char *range, struct string_list *list,
"--output-indicator-old=<",
"--output-indicator-context=#",
"--no-abbrev-commit",
+ "--pretty=medium",
+ "--notes",
NULL);
if (other_arg)
argv_array_pushv(&cp.args, other_arg->argv);
@@ -106,6 +108,17 @@ static int read_patches(const char *range, struct string_list *list,
continue;
}
+ if (!util) {
+ error(_("could not parse first line of `log` output: "
+ "did not start with 'commit ': '%s'"),
+ line);
+ string_list_clear(list, 1);
+ strbuf_release(&buf);
+ strbuf_release(&contents);
+ finish_command(&cp);
+ return -1;
+ }
+
if (starts_with(line, "diff --git")) {
struct patch patch = { 0 };
struct strbuf root = STRBUF_INIT;
