/* 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 "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; argv_array_push(&argv, "snapshot"); argv_array_push(&argv, format); if (prefix) { argv_array_push(&argv, "--prefix"); argv_array_push(&argv, fmt("%s/", prefix)); } argv_array_push(&argv, hex); return write_archive(argv.argc, argv.argv, NULL, 1, NULL, 0); } 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_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(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; 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) { unsigned char sha1[20]; if (get_sha1(hex, sha1)) { cgit_print_error(fmt("Bad object id: %s", hex)); return 1; } if (!lookup_commit_reference(sha1)) { cgit_print_error(fmt("Not a commit reference: %s", hex)); return 1; } ctx.page.mimetype = xstrdup(format->mimetype); ctx.page.filename = xstrdup(filename); cgit_print_http_headers(&ctx); 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' 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]; char *snapshot; snapshot = xstrdup(filename); snapshot[strlen(snapshot) - strlen(format->suffix)] = '\0'; if (get_sha1(snapshot, sha1) == 0) return snapshot; reponame = cgit_repobasename(url); if (prefixcmp(snapshot, reponame) == 0) { snapshot += strlen(reponame); while (snapshot && (*snapshot == '-' || *snapshot == '_')) snapshot++; } if (get_sha1(snapshot, sha1) == 0) return snapshot; snapshot = fmt("v%s", snapshot); if (get_sha1(snapshot, sha1) == 0) return snapshot; return NULL; } void show_error(char *msg) { ctx.page.mimetype = "text/html"; cgit_print_http_headers(&ctx); cgit_print_docstart(&ctx); cgit_print_pageheader(&ctx); cgit_print_error(msg); 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; char *prefix = NULL; if (!filename) { show_error("No snapshot name specified"); return; } f = get_format(filename); if (!f) { show_error(xstrdup(fmt("Unsupported snapshot format: %s", filename))); return; } 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); }