On 06/17/2014 05:53 PM, Ronnie Sahlberg wrote:
> Making errno when returning from verify_lock() meaningful, which
> should almost but not completely fix
>
> * a bug in "git fetch"'s s_update_ref, which trusts the result of an
> errno == ENOTDIR check to detect D/F conflicts
>
> ENOTDIR makes sense as a sign that a file was in the way of a
> directory we wanted to create. Should "git fetch" also look for
> ENOTEMPTY or EEXIST to catch cases where a directory was in the way
> of a file to be created?
>
> Signed-off-by: Ronnie Sahlberg <sahlb...@google.com>
> ---
> refs.c | 4 ++++
> refs.h | 6 +++++-
> 2 files changed, 9 insertions(+), 1 deletion(-)
>
> diff --git a/refs.c b/refs.c
> index 9ea519c..a48f805 100644
> --- a/refs.c
> +++ b/refs.c
> @@ -1932,18 +1932,22 @@ int refname_match(const char *abbrev_name, const char
> *full_name)
> return 0;
> }
>
> +/* This function should make sure errno is meaningful on error */
> static struct ref_lock *verify_lock(struct ref_lock *lock,
> const unsigned char *old_sha1, int mustexist)
> {
> if (read_ref_full(lock->ref_name, lock->old_sha1, mustexist, NULL)) {
> + int save_errno = errno;
> error("Can't verify ref %s", lock->ref_name);
> unlock_ref(lock);
> + errno = save_errno;
> return NULL;
> }
> if (hashcmp(lock->old_sha1, old_sha1)) {
> error("Ref %s is at %s but expected %s", lock->ref_name,
> sha1_to_hex(lock->old_sha1), sha1_to_hex(old_sha1));
> unlock_ref(lock);
> + errno = EBUSY;
> return NULL;
> }
> return lock;
> diff --git a/refs.h b/refs.h
> index 82cc5cb..af4fcdc 100644
> --- a/refs.h
> +++ b/refs.h
> @@ -137,11 +137,15 @@ extern int ref_exists(const char *);
> */
> extern int peel_ref(const char *refname, unsigned char *sha1);
>
> -/** Locks a "refs/" ref returning the lock on success and NULL on failure.
> **/
> +/*
> + * Locks a "refs/" ref returning the lock on success and NULL on failure.
> + * On failure errno is set to something meaningfull.
s/meaningfull/meaningful/
> + */
> extern struct ref_lock *lock_ref_sha1(const char *refname, const unsigned
> char *old_sha1);
>
> /** Locks any ref (for 'HEAD' type refs). */
> #define REF_NODEREF 0x01
> +/* errno is set to something meaningful on failure */
> extern struct ref_lock *lock_any_ref_for_update(const char *refname,
> const unsigned char *old_sha1,
> int flags, int *type_p);
>
--
Michael Haggerty
mhag...@alum.mit.edu
http://softwareswirl.blogspot.com/
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