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log: --show-signature

This teaches the "log" family of commands to pass the GPG signature in the
commit objects to "gpg --verify" via the verify_signed_buffer() interface
used to verify signed tag objects. E.g.

    $ git show --show-signature -s HEAD

shows GPG output in the header part of the output.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
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commit 93104a2742d01adf97f173bda63c12382c77aae2 1 parent 49b5f81
@gitster gitster authored
Showing with 79 additions and 0 deletions.
  1. +34 −0 commit.c
  2. +3 −0  commit.h
  3. +39 −0 log-tree.c
  4. +2 −0  revision.c
  5. +1 −0  revision.h
View
34 commit.c
@@ -848,6 +848,40 @@ static int do_sign_commit(struct strbuf *buf, const char *keyid)
return 0;
}
+int parse_signed_commit(const unsigned char *sha1,
+ struct strbuf *payload, struct strbuf *signature)
+{
+ unsigned long size;
+ enum object_type type;
+ char *buffer = read_sha1_file(sha1, &type, &size);
+ int in_header, saw_signature = -1;
+ char *line;
+
+ if (!buffer || type != OBJ_COMMIT)
+ goto cleanup;
+
+ line = buffer;
+ in_header = 1;
+ saw_signature = 0;
+ while (*line) {
+ char *next = strchrnul(line, '\n');
+ if (*next)
+ next++;
+ if (in_header && !prefixcmp(line, gpg_sig_header)) {
+ const char *sig = line + gpg_sig_header_len;
+ strbuf_add(signature, sig, next - sig);
+ saw_signature = 1;
+ } else {
+ strbuf_add(payload, line, next - line);
+ }
+ if (*line == '\n')
+ in_header = 0;
+ line = next;
+ }
+ cleanup:
+ free(buffer);
+ return saw_signature;
+}
static const char commit_utf8_warn[] =
"Warning: commit message does not conform to UTF-8.\n"
View
3  commit.h
@@ -177,4 +177,7 @@ extern int commit_tree(const char *msg, unsigned char *tree,
struct commit_list *parents, unsigned char *ret,
const char *author, const char *sign_commit);
+extern int parse_signed_commit(const unsigned char *sha1,
+ struct strbuf *message, struct strbuf *signature);
+
#endif /* COMMIT_H */
View
39 log-tree.c
@@ -8,6 +8,7 @@
#include "refs.h"
#include "string-list.h"
#include "color.h"
+#include "gpg-interface.h"
struct decoration name_decoration = { "object names" };
@@ -395,6 +396,41 @@ void log_write_email_headers(struct rev_info *opt, struct commit *commit,
*extra_headers_p = extra_headers;
}
+static void show_signature(struct rev_info *opt, struct commit *commit)
+{
+ struct strbuf payload = STRBUF_INIT;
+ struct strbuf signature = STRBUF_INIT;
+ struct strbuf gpg_output = STRBUF_INIT;
+ int status;
+ const char *color, *reset, *bol, *eol;
+
+ if (parse_signed_commit(commit->object.sha1, &payload, &signature) <= 0)
+ goto out;
+
+ status = verify_signed_buffer(payload.buf, payload.len,
+ signature.buf, signature.len,
+ &gpg_output);
+ if (status && !gpg_output.len)
+ strbuf_addstr(&gpg_output, "No signature\n");
+
+ color = diff_get_color_opt(&opt->diffopt,
+ status ? DIFF_WHITESPACE : DIFF_FRAGINFO);
+ reset = diff_get_color_opt(&opt->diffopt, DIFF_RESET);
+
+ bol = gpg_output.buf;
+ while (*bol) {
+ eol = strchrnul(bol, '\n');
+ printf("%s%.*s%s%s", color, (int)(eol - bol), bol, reset,
+ *eol ? "\n" : "");
+ bol = (*eol) ? (eol + 1) : eol;
+ }
+
+ out:
+ strbuf_release(&gpg_output);
+ strbuf_release(&payload);
+ strbuf_release(&signature);
+}
+
void show_log(struct rev_info *opt)
{
struct strbuf msgbuf = STRBUF_INIT;
@@ -502,6 +538,9 @@ void show_log(struct rev_info *opt)
}
}
+ if (opt->show_signature)
+ show_signature(opt, commit);
+
if (!commit->buffer)
return;
View
2  revision.c
@@ -1381,6 +1381,8 @@ static int handle_revision_opt(struct rev_info *revs, int argc, const char **arg
revs->show_notes = 1;
revs->show_notes_given = 1;
revs->notes_opt.use_default_notes = 1;
+ } else if (!strcmp(arg, "--show-signature")) {
+ revs->show_signature = 1;
} else if (!prefixcmp(arg, "--show-notes=") ||
!prefixcmp(arg, "--notes=")) {
struct strbuf buf = STRBUF_INIT;
View
1  revision.h
@@ -89,6 +89,7 @@ struct rev_info {
show_merge:1,
show_notes:1,
show_notes_given:1,
+ show_signature:1,
pretty_given:1,
abbrev_commit:1,
abbrev_commit_given:1,
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