/* ui-snapshot.c: generate snapshot of a commit * * Copyright (C) 2006-2014 cgit Development Team <cgit@lists.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_archive_type(const char *format, const char *hex, const char *prefix) { struct argv_array argv = ARGV_ARRAY_INIT; const char **nargv; 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); } 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)); result = write_archive(argv.argc, nargv, NULL, 1, NULL, 0); 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); } static int write_zip_archive(const char *hex, const char *prefix) { return write_archive_type("--format=zip", hex, prefix); } static int write_compressed_tar_archive(const char *hex, const char *prefix, char *filter_argv[]) { int rv; struct cgit_exec_filter f; cgit_exec_filter_init(&f, filter_argv[0], filter_argv); cgit_open_filter(&f.base); rv = write_tar_archive(hex, prefix); cgit_close_filter(&f.base); return rv; } 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) { char *argv[] = { "bzip2", NULL }; return write_compressed_tar_archive(hex, prefix, argv); } static int write_tar_xz_archive(const char *hex, const char *prefix) { 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, 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; for (fmt = cgit_snapshot_formats; fmt->suffix; fmt++) { if (ends_with(filename, fmt->suffix)) return fmt; } return NULL; } static int make_snapshot(const struct cgit_snapshot_format *format, const char *hex, const char *prefix, const char *filename) { unsigned char sha1[20]; if (get_sha1(hex, sha1)) { cgit_print_error_page(404, "Not found", "Bad object id: %s", hex); return 1; } if (!lookup_commit_reference(sha1)) { cgit_print_error_page(400, "Bad request", "Not a commit reference: %s", hex); return 1; } ctx.page.etag = sha1_to_hex(sha1); ctx.page.mimetype = xstrdup(format->mimetype); ctx.page.filename = xstrdup(filename); cgit_print_http_headers(); format->write_func(hex, prefix); return 0; } /* 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 (starts_with(snapshot.buf, reponame)) { 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; } void cgit_print_snapshot(const char *head, const char *hex, const char *filename, int dwim) { const struct cgit_snapshot_format* f; char *prefix = NULL; if (!filename) { cgit_print_error_page(400, "Bad request", "No snapshot name specified"); return; } f = get_format(filename); if (!f) { cgit_print_error_page(400, "Bad request", "Unsupported snapshot format: %s", filename); return; } if (!hex && dwim) { hex = get_ref_from_filename(ctx.repo->url, filename, f); if (hex == NULL) { cgit_print_error_page(404, "Not found", "Not found"); 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); }