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f9bc573fda
Callers who ask for ERROR_ON_NO_NAME are not so much concerned that the name will be blank (because, after all, we will fall back to using the username), but rather it is a check to make sure that low-quality identities do not end up in things like commit messages or emails (whereas it is OK for them to end up in things like reflogs). When future commits add more quality checks on the identity, each of these callers would want to use those checks, too. Rather than modify each of them later to add a new flag, let's refactor the flag. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
140 lines
3.3 KiB
C
140 lines
3.3 KiB
C
#include "cache.h"
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#include "run-command.h"
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#include "strbuf.h"
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#include "gpg-interface.h"
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#include "sigchain.h"
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static char *configured_signing_key;
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static const char *gpg_program = "gpg";
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void set_signing_key(const char *key)
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{
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free(configured_signing_key);
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configured_signing_key = xstrdup(key);
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}
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int git_gpg_config(const char *var, const char *value, void *cb)
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{
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if (!strcmp(var, "user.signingkey")) {
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set_signing_key(value);
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}
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if (!strcmp(var, "gpg.program")) {
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if (!value)
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return config_error_nonbool(var);
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gpg_program = xstrdup(value);
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}
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return 0;
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}
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const char *get_signing_key(void)
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{
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if (configured_signing_key)
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return configured_signing_key;
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return git_committer_info(IDENT_STRICT|IDENT_NO_DATE);
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}
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/*
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* Create a detached signature for the contents of "buffer" and append
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* it after "signature"; "buffer" and "signature" can be the same
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* strbuf instance, which would cause the detached signature appended
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* at the end.
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*/
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int sign_buffer(struct strbuf *buffer, struct strbuf *signature, const char *signing_key)
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{
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struct child_process gpg;
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const char *args[4];
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ssize_t len;
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size_t i, j, bottom;
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memset(&gpg, 0, sizeof(gpg));
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gpg.argv = args;
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gpg.in = -1;
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gpg.out = -1;
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args[0] = gpg_program;
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args[1] = "-bsau";
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args[2] = signing_key;
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args[3] = NULL;
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if (start_command(&gpg))
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return error(_("could not run gpg."));
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/*
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* When the username signingkey is bad, program could be terminated
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* because gpg exits without reading and then write gets SIGPIPE.
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*/
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sigchain_push(SIGPIPE, SIG_IGN);
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if (write_in_full(gpg.in, buffer->buf, buffer->len) != buffer->len) {
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close(gpg.in);
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close(gpg.out);
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finish_command(&gpg);
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return error(_("gpg did not accept the data"));
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}
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close(gpg.in);
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bottom = signature->len;
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len = strbuf_read(signature, gpg.out, 1024);
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close(gpg.out);
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sigchain_pop(SIGPIPE);
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if (finish_command(&gpg) || !len || len < 0)
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return error(_("gpg failed to sign the data"));
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/* Strip CR from the line endings, in case we are on Windows. */
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for (i = j = bottom; i < signature->len; i++)
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if (signature->buf[i] != '\r') {
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if (i != j)
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signature->buf[j] = signature->buf[i];
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j++;
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}
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strbuf_setlen(signature, j);
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return 0;
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}
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/*
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* Run "gpg" to see if the payload matches the detached signature.
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* gpg_output, when set, receives the diagnostic output from GPG.
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*/
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int verify_signed_buffer(const char *payload, size_t payload_size,
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const char *signature, size_t signature_size,
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struct strbuf *gpg_output)
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{
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struct child_process gpg;
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const char *args_gpg[] = {NULL, "--verify", "FILE", "-", NULL};
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char path[PATH_MAX];
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int fd, ret;
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args_gpg[0] = gpg_program;
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fd = git_mkstemp(path, PATH_MAX, ".git_vtag_tmpXXXXXX");
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if (fd < 0)
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return error("could not create temporary file '%s': %s",
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path, strerror(errno));
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if (write_in_full(fd, signature, signature_size) < 0)
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return error("failed writing detached signature to '%s': %s",
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path, strerror(errno));
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close(fd);
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memset(&gpg, 0, sizeof(gpg));
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gpg.argv = args_gpg;
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gpg.in = -1;
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if (gpg_output)
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gpg.err = -1;
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args_gpg[2] = path;
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if (start_command(&gpg)) {
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unlink(path);
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return error("could not run gpg.");
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}
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write_in_full(gpg.in, payload, payload_size);
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close(gpg.in);
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if (gpg_output)
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strbuf_read(gpg_output, gpg.err, 0);
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ret = finish_command(&gpg);
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unlink_or_warn(path);
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return ret;
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}
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