/* ui-snapshot.c: generate snapshot of a commit
*
* Copyright (C) 2006 Lars Hjemli
+ * Copyright (C) 2012 Jason A. Donenfeld <Jason@zx2c4.com>
*
* Licensed under GNU General Public License v2
* (see COPYING for full license text)
*/
#include "cgit.h"
+#include "ui-snapshot.h"
#include "html.h"
#include "ui-shared.h"
-static int write_compressed_tar_archive(struct archiver_args *args,const char *filter)
+static int write_archive_type(const char *format, const char *hex, const char *prefix)
{
- int rw[2];
- pid_t gzpid;
- int stdout2;
- int status;
- int rv;
-
- stdout2 = chk_non_negative(dup(STDIN_FILENO), "Preserving STDOUT before compressing");
- chk_zero(pipe(rw), "Opening pipe from compressor subprocess");
- gzpid = chk_non_negative(fork(), "Forking compressor subprocess");
- if(gzpid==0) {
- /* child */
- chk_zero(close(rw[1]), "Closing write end of pipe in child");
- chk_zero(close(STDIN_FILENO), "Closing STDIN");
- chk_non_negative(dup2(rw[0],STDIN_FILENO), "Redirecting compressor input to stdin");
- execlp(filter,filter,NULL);
- _exit(-1);
+ struct argv_array argv = ARGV_ARRAY_INIT;
+ const char **nargv;
+ char *user_home, *xdg_home;
+ int result;
+ argv_array_push(&argv, "snapshot");
+ argv_array_push(&argv, format);
+ if (prefix) {
+ struct strbuf buf = STRBUF_INIT;
+ strbuf_addstr(&buf, prefix);
+ strbuf_addch(&buf, '/');
+ argv_array_push(&argv, "--prefix");
+ argv_array_push(&argv, buf.buf);
+ strbuf_release(&buf);
}
- /* parent */
- chk_zero(close(rw[0]), "Closing read end of pipe");
- chk_non_negative(dup2(rw[1],STDOUT_FILENO), "Redirecting output to compressor");
+ argv_array_push(&argv, hex);
+ /*
+ * Now we need to copy the pointers to arguments into a new
+ * structure because write_archive will rearrange its arguments
+ * which may result in duplicated/missing entries causing leaks
+ * or double-frees in argv_array_clear.
+ */
+ nargv = xmalloc(sizeof(char *) * (argv.argc + 1));
+ /* argv_array guarantees a trailing NULL entry. */
+ memcpy(nargv, argv.argv, sizeof(char *) * (argv.argc + 1));
+
+ user_home = getenv("HOME");
+ xdg_home = getenv("XDG_CONFIG_HOME");
+ unsetenv("HOME");
+ unsetenv("XDG_CONFIG_HOME");
+ result = write_archive(argv.argc, nargv, NULL, 1, NULL, 0);
+ if (user_home)
+ setenv("HOME", user_home, 1);
+ if (xdg_home)
+ setenv("XDG_CONFIG_HOME", xdg_home, 1);
+ argv_array_clear(&argv);
+ free(nargv);
+ return result;
+}
+
+static int write_tar_archive(const char *hex, const char *prefix)
+{
+ return write_archive_type("--format=tar", hex, prefix);
+}
- rv = write_tar_archive(args);
+static int write_zip_archive(const char *hex, const char *prefix)
+{
+ return write_archive_type("--format=zip", hex, prefix);
+}
- chk_zero(close(STDOUT_FILENO), "Closing STDOUT redirected to compressor");
- chk_non_negative(dup2(stdout2,STDOUT_FILENO), "Restoring uncompressed STDOUT");
- chk_zero(close(stdout2), "Closing uncompressed STDOUT");
- chk_zero(close(rw[1]), "Closing write end of pipe in parent");
- chk_positive(waitpid(gzpid,&status,0), "Waiting on compressor process");
- if(! ( WIFEXITED(status) && WEXITSTATUS(status)==0 ) )
- cgit_print_error("Failed to compress archive");
+static int write_compressed_tar_archive(const char *hex,
+ const char *prefix,
+ char *filter_argv[])
+{
+ int rv;
+ struct cgit_filter f;
+ f.cmd = filter_argv[0];
+ f.argv = filter_argv;
+ cgit_open_filter(&f);
+ rv = write_tar_archive(hex, prefix);
+ cgit_close_filter(&f);
return rv;
}
-static int write_tar_gzip_archive(struct archiver_args *args)
+static int write_tar_gzip_archive(const char *hex, const char *prefix)
+{
+ char *argv[] = { "gzip", "-n", NULL };
+ return write_compressed_tar_archive(hex, prefix, argv);
+}
+
+static int write_tar_bzip2_archive(const char *hex, const char *prefix)
{
- return write_compressed_tar_archive(args,"gzip");
+ char *argv[] = { "bzip2", NULL };
+ return write_compressed_tar_archive(hex, prefix, argv);
}
-static int write_tar_bzip2_archive(struct archiver_args *args)
+static int write_tar_xz_archive(const char *hex, const char *prefix)
{
- return write_compressed_tar_archive(args,"bzip2");
+ char *argv[] = { "xz", NULL };
+ return write_compressed_tar_archive(hex, prefix, argv);
}
const struct cgit_snapshot_format cgit_snapshot_formats[] = {
- { ".zip", "application/x-zip", write_zip_archive, 0x1 },
- { ".tar.gz", "application/x-tar", write_tar_gzip_archive, 0x2 },
- { ".tar.bz2", "application/x-tar", write_tar_bzip2_archive, 0x4 },
- { ".tar", "application/x-tar", write_tar_archive, 0x8 },
- {}
+ { ".zip", "application/x-zip", write_zip_archive, 0x01 },
+ { ".tar.gz", "application/x-gzip", write_tar_gzip_archive, 0x02 },
+ { ".tar.bz2", "application/x-bzip2", write_tar_bzip2_archive, 0x04 },
+ { ".tar", "application/x-tar", write_tar_archive, 0x08 },
+ { ".tar.xz", "application/x-xz", write_tar_xz_archive, 0x10 },
+ { NULL }
};
+static const struct cgit_snapshot_format *get_format(const char *filename)
+{
+ const struct cgit_snapshot_format *fmt;
+ int fl, sl;
+
+ fl = strlen(filename);
+ for (fmt = cgit_snapshot_formats; fmt->suffix; fmt++) {
+ sl = strlen(fmt->suffix);
+ if (sl >= fl)
+ continue;
+ if (!strcmp(fmt->suffix, filename + fl - sl))
+ return fmt;
+ }
+ return NULL;
+}
+
static int make_snapshot(const struct cgit_snapshot_format *format,
const char *hex, const char *prefix,
const char *filename)
{
- struct archiver_args args;
- struct commit *commit;
unsigned char sha1[20];
- if(get_sha1(hex, sha1)) {
- cgit_print_error(fmt("Bad object id: %s", hex));
+ if (get_sha1(hex, sha1)) {
+ cgit_print_error("Bad object id: %s", hex);
return 1;
}
- commit = lookup_commit_reference(sha1);
- if(!commit) {
- cgit_print_error(fmt("Not a commit reference: %s", hex));
+ if (!lookup_commit_reference(sha1)) {
+ cgit_print_error("Not a commit reference: %s", hex);
return 1;
}
- memset(&args, 0, sizeof(args));
- if (prefix) {
- args.base = fmt("%s/", prefix);
- args.baselen = strlen(prefix) + 1;
- } else {
- args.base = "";
- args.baselen = 0;
- }
- args.tree = commit->tree;
- args.time = commit->date;
ctx.page.mimetype = xstrdup(format->mimetype);
ctx.page.filename = xstrdup(filename);
cgit_print_http_headers(&ctx);
- format->write_func(&args);
+ format->write_func(hex, prefix);
return 0;
}
-void cgit_print_snapshot(const char *head, const char *hex, const char *prefix,
- const char *filename, int snapshots)
+/* Try to guess the requested revision from the requested snapshot name.
+ * First the format extension is stripped, e.g. "cgit-0.7.2.tar.gz" become
+ * "cgit-0.7.2". If this is a valid commit object name we've got a winner.
+ * Otherwise, if the snapshot name has a prefix matching the result from
+ * repo_basename(), we strip the basename and any following '-' and '_'
+ * characters ("cgit-0.7.2" -> "0.7.2") and check the resulting name once
+ * more. If this still isn't a valid commit object name, we check if pre-
+ * pending a 'v' or a 'V' to the remaining snapshot name ("0.7.2" ->
+ * "v0.7.2") gives us something valid.
+ */
+static const char *get_ref_from_filename(const char *url, const char *filename,
+ const struct cgit_snapshot_format *format)
+{
+ const char *reponame;
+ unsigned char sha1[20];
+ struct strbuf snapshot = STRBUF_INIT;
+ int result = 1;
+
+ strbuf_addstr(&snapshot, filename);
+ strbuf_setlen(&snapshot, snapshot.len - strlen(format->suffix));
+
+ if (get_sha1(snapshot.buf, sha1) == 0)
+ goto out;
+
+ reponame = cgit_repobasename(url);
+ if (prefixcmp(snapshot.buf, reponame) == 0) {
+ const char *new_start = snapshot.buf;
+ new_start += strlen(reponame);
+ while (new_start && (*new_start == '-' || *new_start == '_'))
+ new_start++;
+ strbuf_splice(&snapshot, 0, new_start - snapshot.buf, "", 0);
+ }
+
+ if (get_sha1(snapshot.buf, sha1) == 0)
+ goto out;
+
+ strbuf_insert(&snapshot, 0, "v", 1);
+ if (get_sha1(snapshot.buf, sha1) == 0)
+ goto out;
+
+ strbuf_splice(&snapshot, 0, 1, "V", 1);
+ if (get_sha1(snapshot.buf, sha1) == 0)
+ goto out;
+
+ result = 0;
+ strbuf_release(&snapshot);
+
+out:
+ return result ? strbuf_detach(&snapshot, NULL) : NULL;
+}
+
+__attribute__((format (printf, 1, 2)))
+static void show_error(char *fmt, ...)
+{
+ va_list ap;
+
+ ctx.page.mimetype = "text/html";
+ cgit_print_http_headers(&ctx);
+ cgit_print_docstart(&ctx);
+ cgit_print_pageheader(&ctx);
+ va_start(ap, fmt);
+ cgit_vprint_error(fmt, ap);
+ va_end(ap);
+ cgit_print_docend();
+}
+
+void cgit_print_snapshot(const char *head, const char *hex,
+ const char *filename, int snapshots, int dwim)
{
const struct cgit_snapshot_format* f;
- int sl, fnl;
+ char *prefix = NULL;
- fnl = strlen(filename);
- if (!hex)
- hex = head;
- for (f = cgit_snapshot_formats; f->suffix; f++) {
- if (!(snapshots & f->bit))
- continue;
- sl = strlen(f->suffix);
- if(fnl < sl || strcmp(&filename[fnl-sl], f->suffix))
- continue;
- make_snapshot(f, hex, prefix, filename);
+ if (!filename) {
+ show_error("No snapshot name specified");
+ return;
+ }
+
+ f = get_format(filename);
+ if (!f) {
+ show_error("Unsupported snapshot format: %s", filename);
return;
}
- cgit_print_error(fmt("Unsupported snapshot format: %s", filename));
+
+ if (!hex && dwim) {
+ hex = get_ref_from_filename(ctx.repo->url, filename, f);
+ if (hex == NULL) {
+ html_status(404, "Not found", 0);
+ return;
+ }
+ prefix = xstrdup(filename);
+ prefix[strlen(filename) - strlen(f->suffix)] = '\0';
+ }
+
+ if (!hex)
+ hex = head;
+
+ if (!prefix)
+ prefix = xstrdup(cgit_repobasename(ctx.repo->url));
+
+ make_snapshot(f, hex, prefix, filename);
+ free(prefix);
}
git.ckatri.com / cgit.git / blobdiff