From 937032e14aaf1eab59c96dd78938be1c48c648e1 Mon Sep 17 00:00:00 2001 From: "brian m. carlson" Date: Thu, 11 Feb 2021 02:08:04 +0000 Subject: [PATCH] commit: allow parsing arbitrary buffers with headers Currently only commits are signed with headers. However, in the future, we'll also sign tags with headers as well. Let's refactor out a function called parse_buffer_signed_by_header which does exactly that. In addition, since we'll want to sign things other than commits this way, let's call the function sign_with_header instead of do_sign_commit. Signed-off-by: brian m. carlson Signed-off-by: Junio C Hamano --- commit.c | 20 ++++++++++++++++---- commit.h | 9 +++++++++ 2 files changed, 25 insertions(+), 4 deletions(-) diff --git a/commit.c b/commit.c index d9ccbae519..d42ab9702f 100644 --- a/commit.c +++ b/commit.c @@ -995,7 +995,7 @@ static const char *gpg_sig_headers[] = { "gpgsig-sha256", }; -static int do_sign_commit(struct strbuf *buf, const char *keyid) +int sign_with_header(struct strbuf *buf, const char *keyid) { struct strbuf sig = STRBUF_INIT; int inspos, copypos; @@ -1035,13 +1035,26 @@ static int do_sign_commit(struct strbuf *buf, const char *keyid) return 0; } + + int parse_signed_commit(const struct commit *commit, struct strbuf *payload, struct strbuf *signature, const struct git_hash_algo *algop) { - unsigned long size; const char *buffer = get_commit_buffer(commit, &size); + int ret = parse_buffer_signed_by_header(buffer, size, payload, signature, algop); + + unuse_commit_buffer(commit, buffer); + return ret; +} + +int parse_buffer_signed_by_header(const char *buffer, + unsigned long size, + struct strbuf *payload, + struct strbuf *signature, + const struct git_hash_algo *algop) +{ int in_signature = 0, saw_signature = 0, other_signature = 0; const char *line, *tail, *p; const char *gpg_sig_header = gpg_sig_headers[hash_algo_by_ptr(algop)]; @@ -1078,7 +1091,6 @@ int parse_signed_commit(const struct commit *commit, } line = next; } - unuse_commit_buffer(commit, buffer); return saw_signature; } @@ -1532,7 +1544,7 @@ int commit_tree_extended(const char *msg, size_t msg_len, if (encoding_is_utf8 && !verify_utf8(&buffer)) fprintf(stderr, _(commit_utf8_warn)); - if (sign_commit && do_sign_commit(&buffer, sign_commit)) { + if (sign_commit && sign_with_header(&buffer, sign_commit)) { result = -1; goto out; } diff --git a/commit.h b/commit.h index 030aa65ab8..e2856ce8ef 100644 --- a/commit.h +++ b/commit.h @@ -360,4 +360,13 @@ int compare_commits_by_gen_then_commit_date(const void *a_, const void *b_, void LAST_ARG_MUST_BE_NULL int run_commit_hook(int editor_is_used, const char *index_file, const char *name, ...); +/* Sign a commit or tag buffer, storing the result in a header. */ +int sign_with_header(struct strbuf *buf, const char *keyid); +/* Parse the signature out of a header. */ +int parse_buffer_signed_by_header(const char *buffer, + unsigned long size, + struct strbuf *payload, + struct strbuf *signature, + const struct git_hash_algo *algop); + #endif /* COMMIT_H */