mirrors/git
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

distinguish error versus short read from read_in_full()

Browse Source 
Many callers of read_in_full() expect to see the exact
number of bytes requested, but their error handling lumps
together true read errors and short reads due to unexpected
EOF.

We can give more specific error messages by separating these
cases (showing errno when appropriate, and otherwise
describing the short read).

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jeff King
2017-09-27 02:02:11 -04:00
committed by Junio C Hamano
parent 90dca6710e
commit 41dcc4dccc
3 changed files with 16 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

11
packfile.c
View File

@ -444,6 +444,7 @@ static int open_packed_git_1(struct packed_git *p)
unsigned char sha1[20];
unsigned char *idx_sha1;
long fd_flag;
ssize_t read_result;
if (!p->index_data && open_pack_index(p))
return error("packfile %s index unavailable", p->pack_name);
@ -485,7 +486,10 @@ static int open_packed_git_1(struct packed_git *p)
return error("cannot set FD_CLOEXEC");
/* Verify we recognize this pack file format. */
if (read_in_full(p->pack_fd, &hdr, sizeof(hdr)) != sizeof(hdr))
read_result = read_in_full(p->pack_fd, &hdr, sizeof(hdr));
if (read_result < 0)
return error_errno("error reading from %s", p->pack_name);
if (read_result != sizeof(hdr))
return error("file %s is far too short to be a packfile", p->pack_name);
if (hdr.hdr_signature != htonl(PACK_SIGNATURE))
return error("file %s is not a GIT packfile", p->pack_name);
@ -502,7 +506,10 @@ static int open_packed_git_1(struct packed_git *p)
p->num_objects);
if (lseek(p->pack_fd, p->pack_size - sizeof(sha1), SEEK_SET) == -1)
return error("end of packfile %s is unavailable", p->pack_name);
if (read_in_full(p->pack_fd, sha1, sizeof(sha1)) != sizeof(sha1))
read_result = read_in_full(p->pack_fd, sha1, sizeof(sha1));
if (read_result < 0)
return error_errno("error reading from %s", p->pack_name);
if (read_result != sizeof(sha1))
return error("packfile %s signature is unavailable", p->pack_name);
idx_sha1 = ((unsigned char *)p->index_data) + p->index_size - 40;
if (hashcmp(sha1, idx_sha1))