Re: something fishy with Git commit and log from file

[Junio C Hamano <gitster@pobox.com>]

Pascal Obry <pascal@obry.net> writes:

> Junio C Hamano a écrit :
>> Pascal Obry <pascal@obry.net> writes:
>>
>>> So definitely a Git bug! Can be reproduced with:
>>>
>>>    $ mkdir repo && cd repo
>>>    $ git init
>>>    $ mkdir dir
>>>    $ cd dir
>>>    $ echo file > file
>>>    $ echo log > log
>>>    $ git add file
>>>    $ git commit --file=log
>>>    fatal: could not read log file 'log': No such file or directory
>>
>> Try it without cding down to "dir".
>
> Yes it works.

Perhaps something like this.  This must be another one of those
regressions introduced in C rewrite.

diff --git a/builtin-commit.c b/builtin-commit.c
index b783e6e..fcc9c59 100644
--- a/builtin-commit.c
+++ b/builtin-commit.c
@@ -469,7 +469,10 @@ static int prepare_to_commit(const char *index_file, const char *prefix)
 			die("could not read log from standard input");
 		hook_arg1 = "message";
 	} else if (logfile) {
-		if (strbuf_read_file(&sb, logfile, 0) < 0)
+		const char *lf = logfile;
+		if (prefix)
+			lf = prefix_filename(prefix, strlen(prefix), logfile);
+		if (strbuf_read_file(&sb, lf, 0) < 0)
 			die("could not read log file '%s': %s",
 			    logfile, strerror(errno));
 		hook_arg1 = "message";