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Sat, 26 Feb 2022 04:45:46 -0800 (PST) From: Akihiko Odaki To: Subject: [PATCH v2 1/4] cutils: Introduce bundle mechanism Date: Sat, 26 Feb 2022 21:45:32 +0900 Message-Id: <20220226124535.76885-2-akihiko.odaki@gmail.com> X-Mailer: git-send-email 2.32.0 (Apple Git-132) In-Reply-To: <20220226124535.76885-1-akihiko.odaki@gmail.com> References: <20220226124535.76885-1-akihiko.odaki@gmail.com> MIME-Version: 1.0 X-Host-Lookup-Failed: Reverse DNS lookup failed for 2607:f8b0:4864:20::1034 (failed) Received-SPF: pass client-ip=2607:f8b0:4864:20::1034; envelope-from=akihiko.odaki@gmail.com; helo=mail-pj1-x1034.google.com X-Spam_score_int: -6 X-Spam_score: -0.7 X-Spam_bar: / X-Spam_report: (-0.7 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, PDS_HP_HELO_NORDNS=0.659, RCVD_IN_DNSWL_NONE=-0.0001, RDNS_NONE=0.793, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Peter Maydell , Jason Wang , qemu-devel@nongnu.org, Programmingkid , Gerd Hoffmann , Akihiko Odaki Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" Developers often run QEMU without installing. The bundle mechanism allows to look up files which should be present in installation even in such a situation. Signed-off-by: Akihiko Odaki --- include/qemu/cutils.h | 19 +++++++++++++++++++ util/cutils.c | 33 +++++++++++++++++++++++++++++++++ 2 files changed, 52 insertions(+) diff --git a/include/qemu/cutils.h b/include/qemu/cutils.h index 320543950c4..98ff59e38e3 100644 --- a/include/qemu/cutils.h +++ b/include/qemu/cutils.h @@ -209,6 +209,25 @@ int qemu_pstrcmp0(const char **str1, const char **str2); */ char *get_relocated_path(const char *dir); +/** + * find_bundle: + * @path: Relative path + * + * Returns a path for the specified directory or file bundled in QEMU. It uses + * the directory of the running executable as the prefix first. See + * get_relocated_path() for the details. The next candidate is "qemu-bundle" + * directory in the directory of the running executable. "qemu-bundle" + * directory is typically present in the build tree. + * + * The returned string should be freed by the caller. + * + * Returns: a path that can access the bundle, or NULL if no matching bundle + * exists. + */ +char *find_bundle(const char *path); + +void list_bundle_candidates(const char *path); + static inline const char *yes_no(bool b) { return b ? "yes" : "no"; diff --git a/util/cutils.c b/util/cutils.c index c9b91e7535a..b4e4cda71c8 100644 --- a/util/cutils.c +++ b/util/cutils.c @@ -1057,3 +1057,36 @@ char *get_relocated_path(const char *dir) } return g_string_free(result, false); } + +static const char * const bundle_formats[] = { + "%s" G_DIR_SEPARATOR_S ".." G_DIR_SEPARATOR_S "%s", + "%s" G_DIR_SEPARATOR_S "qemu-bundle" G_DIR_SEPARATOR_S "%s" +}; + +char *find_bundle(const char *path) +{ + const char *dir = qemu_get_exec_dir(); + char *candidate; + int i; + + for (i = 0; i < ARRAY_SIZE(bundle_formats); i++) { + candidate = g_strdup_printf(bundle_formats[i], dir, path); + if (access(candidate, R_OK) == 0) { + return candidate; + } + g_free(candidate); + } + + return NULL; +} + +void list_bundle_candidates(const char *path) +{ + const char *dir = qemu_get_exec_dir(); + int i; + + for (i = 0; i < ARRAY_SIZE(bundle_formats); i++) { + printf(bundle_formats[i], dir, path); + putc('\n', stdout); + } +}