libgit2/examples/common.c at executable · novalis/libgit2 · GitHub

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* Utilities library for libgit2 examples

* Written by the libgit2 contributors

* To the extent possible under law, the author(s) have dedicated all copyright

* and related and neighboring rights to this software to the public domain

* worldwide. This software is distributed without any warranty.

* You should have received a copy of the CC0 Public Domain Dedication along

* with this software. If not, see

* <http://creativecommons.org/publicdomain/zero/1.0/>.

#include "common.h"

#ifndef _WIN32

# include <unistd.h>

#endif

#include <errno.h>

void check_lg2(int error, const char *message, const char *extra)

{

const git_error *lg2err;

const char *lg2msg = "", *lg2spacer = "";

if (!error)

return;

if ((lg2err = git_error_last()) != NULL && lg2err->message != NULL) {

lg2msg = lg2err->message;

lg2spacer = " - ";

}

if (extra)

fprintf(stderr, "%s '%s' [%d]%s%s\n",

message, extra, error, lg2spacer, lg2msg);

else

fprintf(stderr, "%s [%d]%s%s\n",

message, error, lg2spacer, lg2msg);

exit(1);

}

void fatal(const char *message, const char *extra)

{

if (extra)

fprintf(stderr, "%s %s\n", message, extra);

else

fprintf(stderr, "%s\n", message);

exit(1);

}

int diff_output(

const git_diff_delta *d,

const git_diff_hunk *h,

const git_diff_line *l,

void *p)

{

FILE *fp = (FILE*)p;

(void)d; (void)h;

if (!fp)

fp = stdout;

if (l->origin == GIT_DIFF_LINE_CONTEXT ||

l->origin == GIT_DIFF_LINE_ADDITION ||

l->origin == GIT_DIFF_LINE_DELETION)

fputc(l->origin, fp);

fwrite(l->content, 1, l->content_len, fp);

return 0;

}

void treeish_to_tree(

git_tree **out, git_repository *repo, const char *treeish)

{

git_object *obj = NULL;

check_lg2(

git_revparse_single(&obj, repo, treeish),

"looking up object", treeish);

check_lg2(

git_object_peel((git_object **)out, obj, GIT_OBJECT_TREE),

"resolving object to tree", treeish);

git_object_free(obj);

}

void *xrealloc(void *oldp, size_t newsz)

{

void *p = realloc(oldp, newsz);

if (p == NULL) {

fprintf(stderr, "Cannot allocate memory, exiting.\n");

exit(1);

}

return p;

}

int resolve_refish(git_annotated_commit **commit, git_repository *repo, const char *refish)

{

git_reference *ref;

git_object *obj;

int err = 0;

assert(commit != NULL);

err = git_reference_dwim(&ref, repo, refish);

if (err == GIT_OK) {

git_annotated_commit_from_ref(commit, repo, ref);

git_reference_free(ref);

return 0;

}

err = git_revparse_single(&obj, repo, refish);

if (err == GIT_OK) {

err = git_annotated_commit_lookup(commit, repo, git_object_id(obj));

git_object_free(obj);

}

return err;

}

static int readline(char **out)

{

int c, error = 0, length = 0, allocated = 0;

char *line = NULL;

errno = 0;

while ((c = getchar()) != EOF) {

if (length == allocated) {

allocated += 16;

if ((line = realloc(line, allocated)) == NULL) {

error = -1;

goto error;

}

if (c == '\n')

break;

line[length++] = c;

}

if (errno != 0) {

error = -1;

goto error;

}

line[length] = '\0';

*out = line;

line = NULL;

error = length;

error:

free(line);

return error;

}

static int ask(char **out, const char *prompt, char optional)

{

printf("%s ", prompt);

fflush(stdout);

if (!readline(out) && !optional) {

fprintf(stderr, "Could not read response: %s", strerror(errno));

return -1;

}

return 0;

}

int cred_acquire_cb(git_credential **out,

const char *url,

const char *username_from_url,

unsigned int allowed_types,

void *payload)

{

char *username = NULL, *password = NULL, *privkey = NULL, *pubkey = NULL;

int error = 1;

UNUSED(url);

UNUSED(payload);

if (username_from_url) {

if ((username = strdup(username_from_url)) == NULL)

goto out;

} else if ((error = ask(&username, "Username:", 0)) < 0) {

goto out;

}

if (allowed_types & GIT_CREDENTIAL_SSH_KEY) {

int n;

if ((error = ask(&privkey, "SSH Key:", 0)) < 0 ||

(error = ask(&password, "Password:", 1)) < 0)

goto out;

if ((n = snprintf(NULL, 0, "%s.pub", privkey)) < 0 ||

(pubkey = malloc(n + 1)) == NULL ||

(n = snprintf(pubkey, n + 1, "%s.pub", privkey)) < 0)

goto out;

error = git_credential_ssh_key_new(out, username, pubkey, privkey, password);

} else if (allowed_types & GIT_CREDENTIAL_USERPASS_PLAINTEXT) {

if ((error = ask(&password, "Password:", 1)) < 0)

goto out;

error = git_credential_userpass_plaintext_new(out, username, password);

} else if (allowed_types & GIT_CREDENTIAL_USERNAME) {

error = git_credential_username_new(out, username);

}

out:

free(username);

free(password);

free(privkey);

free(pubkey);

return error;

}

char *read_file(const char *path)

{

ssize_t total = 0;

char *buf = NULL;

struct stat st;

int fd = -1;

if ((fd = open(path, O_RDONLY)) < 0 || fstat(fd, &st) < 0)

goto out;

if ((buf = malloc(st.st_size + 1)) == NULL)

goto out;

while (total < st.st_size) {

ssize_t bytes = read(fd, buf + total, st.st_size - total);

if (bytes <= 0) {

if (errno == EAGAIN || errno == EINTR)

continue;

free(buf);

buf = NULL;

goto out;

}

total += bytes;

}

buf[total] = '\0';

out:

if (fd >= 0)

close(fd);

return buf;

}

libgit2/examples/common.c at executable · novalis/libgit2 · GitHub

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