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get-tar-commit-id: parse comment record

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Parse pax comment records properly and get rid of magic numbers for
acceptable comment length.  This simplifies a later change to handle
longer hashes.

Signed-off-by: Rene Scharfe <l.s.r@web.de>
Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Rene Scharfe 2019-02-19 00:05:18 +00:00 committed by Junio C Hamano
parent 95399788d1
commit 3548726cd7
1 changed files with 11 additions and 2 deletions
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13
builtin/get-tar-commit-id.c
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@ -21,6 +21,8 @@ int cmd_get_tar_commit_id(int argc, const char **argv, const char *prefix)
char *content = buffer + RECORDSIZE;
const char *comment;
ssize_t n;
long len;
char *end;
if (argc != 1)
usage(builtin_get_tar_commit_id_usage);
@ -32,10 +34,17 @@ int cmd_get_tar_commit_id(int argc, const char **argv, const char *prefix)
die_errno("git get-tar-commit-id: EOF before reading tar header");
if (header->typeflag[0] != 'g')
return 1;
if (!skip_prefix(content, "52 comment=", &comment))
len = strtol(content, &end, 10);
if (errno == ERANGE || end == content || len < 0)
return 1;
if (!skip_prefix(end, " comment=", &comment))
return 1;
len -= comment - content;
if (len != GIT_SHA1_HEXSZ + 1)
return 1;
if (write_in_full(1, comment, 41) < 0)
if (write_in_full(1, comment, len) < 0)
die_errno("git get-tar-commit-id: write error");
return 0;