threads / patch / 7665

patchentry.c: Use strerror() to print error info when possible

Subject: [PATCH] entry.c: Use strerror() to print error info when possible

## tl;dr

5 messages between Apr 15, 2007 and Apr 15, 2007. Diffs are folded; open one to read it.

replies: 4people: 3as markdown or json

Luiz Fernando N. Capitulino· Apr 15, 2007, 21:56 UTC · lore
Signed-off-by: Luiz Fernando N. Capitulino <lcapitulino@mandriva.com.br>
---
 entry.c |   11 ++++++-----
 1 files changed, 6 insertions(+), 5 deletions(-)
Show changes to entry.c +6 −5
diff --git a/entry.c b/entry.c
index d72f811..c36c09d 100644
--- a/entry.c
+++ b/entry.c
@@ -19,7 +19,8 @@ static void create_directories(const char *path, struct checkout *state)
 				if (!stat(buf, &st) && S_ISDIR(st.st_mode))
 					continue; /* ok */
 			}
-			die("cannot create directory at %s", buf);
+			die("cannot create directory at %s (%s)", buf,
+			    strerror(errno));
 		}
 	}
 	free(buf);
@@ -33,7 +34,7 @@ static void remove_subtree(const char *path)
 	char *name;
 	
 	if (!dir)
-		die("cannot opendir %s", path);
+		die("cannot opendir %s (%s)", path, strerror(errno));
 	strcpy(pathbuf, path);
 	name = pathbuf + strlen(path);
 	*name++ = '/';
@@ -45,15 +46,15 @@ static void remove_subtree(const char *path)
 			continue;
 		strcpy(name, de->d_name);
 		if (lstat(pathbuf, &st))
-			die("cannot lstat %s", pathbuf);
+			die("cannot lstat %s (%s)", pathbuf, strerror(errno));
 		if (S_ISDIR(st.st_mode))
 			remove_subtree(pathbuf);
 		else if (unlink(pathbuf))
-			die("cannot unlink %s", pathbuf);
+			die("cannot unlink %s (%s)", pathbuf, strerror(errno));
 	}
 	closedir(dir);
 	if (rmdir(path))
-		die("cannot rmdir %s", path);
+		die("cannot rmdir %s (%s)", path, strerror(errno));
 }
 
 static int create_file(const char *path, unsigned int mode)

-- 
1.5.1.1.85.geed2-dirty
Junio C Hamano· Apr 15, 2007, 22:54 UTC · re: Luiz Fernando N. Capitulino · lore

Re: [PATCH] entry.c: Use strerror() to print error info when possible

"Luiz Fernando N. Capitulino" <lcapitulino@mandriva.com.br> writes:

Show 19 quoted lines
> Signed-off-by: Luiz Fernando N. Capitulino <lcapitulino@mandriva.com.br>
> ---
>  entry.c |   11 ++++++-----
>  1 files changed, 6 insertions(+), 5 deletions(-)
>
> diff --git a/entry.c b/entry.c
> index d72f811..c36c09d 100644
> --- a/entry.c
> +++ b/entry.c
> @@ -19,7 +19,8 @@ static void create_directories(const char *path, struct checkout *state)
>  				if (!stat(buf, &st) && S_ISDIR(st.st_mode))
>  					continue; /* ok */
>  			}
> -			die("cannot create directory at %s", buf);
> +			die("cannot create directory at %s (%s)", buf,
> +			    strerror(errno));
>  		}
>  	}
>  	free(buf);

This hunk is wrong; stat() you see in the context could have been what failed the last before this die().

I do not think other places you patched do not share the issue.
Luiz Fernando N. Capitulino· Apr 15, 2007, 23:54 UTC · re: Junio C Hamano · lore

Re: [PATCH] entry.c: Use strerror() to print error info when possible

Em Sun, 15 Apr 2007 15:54:47 -0700 Junio C Hamano <junkio@cox.net> escreveu:

| "Luiz Fernando N. Capitulino" <lcapitulino@mandriva.com.br>
| writes:
| 
| > Signed-off-by: Luiz Fernando N. Capitulino <lcapitulino@mandriva.com.br>
| > ---
| >  entry.c |   11 ++++++-----
| >  1 files changed, 6 insertions(+), 5 deletions(-)
| >
| > diff --git a/entry.c b/entry.c
| > index d72f811..c36c09d 100644
| > --- a/entry.c
| > +++ b/entry.c
| > @@ -19,7 +19,8 @@ static void create_directories(const char *path, struct checkout *state)
| >  				if (!stat(buf, &st) && S_ISDIR(st.st_mode))
| >  					continue; /* ok */
| >  			}
| > -			die("cannot create directory at %s", buf);
| > +			die("cannot create directory at %s (%s)", buf,
| > +			    strerror(errno));
| >  		}
| >  	}
| >  	free(buf);
| 
| This hunk is wrong; stat() you see in the context could have
| been what failed the last before this die().
 You right, will try to read the code more carefully before
patching.
| I do not think other places you patched do not share the issue.
 Other places seems ok, I'll review and re-send along with other
patches I'm working on.
 Thanks a lot for the feedback.
Alex Riesen· Apr 15, 2007, 23:00 UTC · re: Luiz Fernando N. Capitulino · lore

Re: [PATCH] entry.c: Use strerror() to print error info when possible

Luiz Fernando N. Capitulino, Sun, Apr 15, 2007 23:56:19 +0200:
Show 17 quoted lines
> 
> Signed-off-by: Luiz Fernando N. Capitulino <lcapitulino@mandriva.com.br>
> ---
>  entry.c |   11 ++++++-----
>  1 files changed, 6 insertions(+), 5 deletions(-)
> 
> diff --git a/entry.c b/entry.c
> index d72f811..c36c09d 100644
> --- a/entry.c
> +++ b/entry.c
> @@ -19,7 +19,8 @@ static void create_directories(const char *path, struct checkout *state)
>  				if (!stat(buf, &st) && S_ISDIR(st.st_mode))
>  					continue; /* ok */
>  			}
> -			die("cannot create directory at %s", buf);
> +			die("cannot create directory at %s (%s)", buf,
> +			    strerror(errno));

This errno is not very useful, as it may come from the stat above, and you provided no way to figure out what was the syscall (the mkdir or the stat) which failed. Also, the errnos of unlink or mkdir just above the stat are just lost.

It is not worse than before, but not very much better either, and probably confusing. I suggest you just leave this one as it is.

Luiz Fernando N. Capitulino· Apr 15, 2007, 23:57 UTC · re: Alex Riesen · lore

Re: [PATCH] entry.c: Use strerror() to print error info when possible

Em Mon, 16 Apr 2007 01:00:20 +0200 Alex Riesen <raa.lkml@gmail.com> escreveu:

| Luiz Fernando N. Capitulino, Sun, Apr 15, 2007 23:56:19 +0200:
| > 
| > Signed-off-by: Luiz Fernando N. Capitulino <lcapitulino@mandriva.com.br>
| > ---
| >  entry.c |   11 ++++++-----
| >  1 files changed, 6 insertions(+), 5 deletions(-)
| > 
| > diff --git a/entry.c b/entry.c
| > index d72f811..c36c09d 100644
| > --- a/entry.c
| > +++ b/entry.c
| > @@ -19,7 +19,8 @@ static void create_directories(const char *path, struct checkout *state)
| >  				if (!stat(buf, &st) && S_ISDIR(st.st_mode))
| >  					continue; /* ok */
| >  			}
| > -			die("cannot create directory at %s", buf);
| > +			die("cannot create directory at %s (%s)", buf,
| > +			    strerror(errno));
| 
| This errno is not very useful, as it may come from the stat above, and
| you provided no way to figure out what was the syscall (the mkdir or
| the stat) which failed. Also, the errnos of unlink or mkdir just above
| the stat are just lost.
| 
| It is not worse than before, but not very much better either, and
| probably confusing. I suggest you just leave this one as it is.
 Will do, thanks for reviewing Alex.

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