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In addition to included unit tests, at $DAYJOB we have tested building JJ[1] with our library and used it to replace some of the libgit2-rs uses. [1] https://github.com/martinvonz/jj Please find V1 cover letter here: https://lore.kernel.org/git/cover.1723054623.git.steadmon@google.com/ Changes in V4: * Drop V3 patch #3, which added wrappers around repository initialization and config access. These are not well-libified, and they are not necessary for JJ's proof-of-concept use case, so let's avoid exporting them for now. * Set a minimum supported Rust version of 1.63. Autodetect whether our Rust version has c_int and c_char types; if not, define them ourselves. * When building libgitpub.a via build.rs, set DEVELOPER=1 to catch additional errors at build time. * In build.rs, use the make_cmd crate to portable select the correct invocation of GNU Make. * Follow naming standards for _alloc() and _free() functions. * Use String instead of CString in higher-level API. * Move libgit_configset_alloc() and libgit_configset_free() out of upstream Git, to the libgitpub shim library. * In libgitpub, initialize libgit_config_set structs in the _alloc() function rather than with a separate _init() function. * Remove unnecessary comments in libgit-sys showing where the wrapped functions were originally defined. * Fix clippy lint: don't reborrow configfile path references. * Various typo fixes and `cargo fmt` fixes. Changes in V3: * Renamed cgit-rs to libgit-rs and cgit-sys to libgit-sys * Makefile cleanup, particularly adding config.mak options that developers can set to run Rust builds and tests by default (Patch 6) * Provide testdata configs for unit tests * ConfigSet API now uses &Path instead of &str -- more ergonomic for Rust users to pass in and errors out if the path string isn't UTF-8 * Fixed unresolved dependency on libz in Cargo.toml Known NEEDSWORK: * Investigate alternative methods of managing symbol visibility & renaming. * Figure out symbol versioning Calvin Wan (2): libgit: add higher-level libgit crate Makefile: add option to build and test libgit-rs and libgit-rs-sys Josh Steadmon (3): common-main: split init and exit code into new files libgit-sys: introduce Rust wrapper for libgit.a libgit-sys: also export some config_set functions .gitignore | 2 + Makefile | 31 ++++++ common-exit.c | 26 +++++ common-init.c | 63 ++++++++++++ common-init.h | 6 ++ common-main.c | 83 +--------------- contrib/libgit-rs/Cargo.lock | 77 +++++++++++++++ contrib/libgit-rs/Cargo.toml | 15 +++ contrib/libgit-rs/build.rs | 4 + contrib/libgit-rs/libgit-sys/Cargo.lock | 69 ++++++++++++++ contrib/libgit-rs/libgit-sys/Cargo.toml | 17 ++++ contrib/libgit-rs/libgit-sys/README.md | 15 +++ contrib/libgit-rs/libgit-sys/build.rs | 35 +++++++ .../libgit-sys/public_symbol_export.c | 50 ++++++++++ .../libgit-sys/public_symbol_export.h | 18 ++++ contrib/libgit-rs/libgit-sys/src/lib.rs | 79 +++++++++++++++ contrib/libgit-rs/src/lib.rs | 95 +++++++++++++++++++ contrib/libgit-rs/testdata/config1 | 2 + contrib/libgit-rs/testdata/config2 | 2 + contrib/libgit-rs/testdata/config3 | 2 + t/Makefile | 16 ++++ 21 files changed, 626 insertions(+), 81 deletions(-) create mode 100644 common-exit.c create mode 100644 common-init.c create mode 100644 common-init.h create mode 100644 contrib/libgit-rs/Cargo.lock create mode 100644 contrib/libgit-rs/Cargo.toml create mode 100644 contrib/libgit-rs/build.rs create mode 100644 contrib/libgit-rs/libgit-sys/Cargo.lock create mode 100644 contrib/libgit-rs/libgit-sys/Cargo.toml create mode 100644 contrib/libgit-rs/libgit-sys/README.md create mode 100644 contrib/libgit-rs/libgit-sys/build.rs create mode 100644 contrib/libgit-rs/libgit-sys/public_symbol_export.c create mode 100644 contrib/libgit-rs/libgit-sys/public_symbol_export.h create mode 100644 contrib/libgit-rs/libgit-sys/src/lib.rs create mode 100644 contrib/libgit-rs/src/lib.rs create mode 100644 contrib/libgit-rs/testdata/config1 create mode 100644 contrib/libgit-rs/testdata/config2 create mode 100644 contrib/libgit-rs/testdata/config3 Range-diff against v3: 1: 83afd7f4a2 ! 1: 1ae14207f6 common-main: split init and exit code into new files @@ Commit message [2] https://lore.kernel.org/git/20230517-unit-tests-v2-v2-1-21b5b60f4b32@google.com/ - Signed-off-by: Calvin Wan + Signed-off-by: Josh Steadmon ## Makefile ## @@ Makefile: LIB_OBJS += combine-diff.o 2: 354b498494 ! 2: ed925d6a33 libgit-sys: introduce Rust wrapper for libgit.a @@ Commit message Co-authored-by: Calvin Wan Signed-off-by: Calvin Wan Signed-off-by: Kyle Lippincott + Signed-off-by: Josh Steadmon ## .gitignore ## @@ contrib/libgit-rs/libgit-sys/Cargo.lock (new) +version = 3 + +[[package]] ++name = "autocfg" ++version = "1.4.0" ++source = "registry+https://github.com/rust-lang/crates.io-index" ++checksum = "ace50bade8e6234aa140d9a2f552bbee1db4d353f69b8217bc503490fc1a9f26" ++ ++[[package]] +name = "cc" +version = "1.1.15" +source = "registry+https://github.com/rust-lang/crates.io-index" @@ contrib/libgit-rs/libgit-sys/Cargo.lock (new) +name = "libgit-sys" +version = "0.1.0" +dependencies = [ ++ "autocfg", + "libz-sys", ++ "make-cmd", +] + +[[package]] @@ contrib/libgit-rs/libgit-sys/Cargo.lock (new) +] + +[[package]] ++name = "make-cmd" ++version = "0.1.0" ++source = "registry+https://github.com/rust-lang/crates.io-index" ++checksum = "a8ca8afbe8af1785e09636acb5a41e08a765f5f0340568716c18a8700ba3c0d3" ++ ++[[package]] +name = "pkg-config" +version = "0.3.30" +source = "registry+https://github.com/rust-lang/crates.io-index" @@ contrib/libgit-rs/libgit-sys/Cargo.toml (new) +edition = "2021" +build = "build.rs" +links = "gitpub" ++rust-version = "1.63" + +[lib] +path = "src/lib.rs" + +[dependencies] +libz-sys = "1.1.19" - \ No newline at end of file ++ ++[build-dependencies] ++autocfg = "1.4.0" ++make-cmd = "0.1.0" ## contrib/libgit-rs/libgit-sys/README.md (new) ## @@ @@ contrib/libgit-rs/libgit-sys/build.rs (new) +use std::path::PathBuf; + +pub fn main() -> std::io::Result<()> { ++ let ac = autocfg::new(); ++ ac.emit_has_path("std::ffi::c_char"); ++ + let crate_root = PathBuf::from(env::var_os("CARGO_MANIFEST_DIR").unwrap()); + let git_root = crate_root.join("../../.."); + let dst = PathBuf::from(env::var_os("OUT_DIR").unwrap()); + -+ let make_output = std::process::Command::new("make") ++ let make_output = make_cmd::gnu_make() ++ .env("DEVELOPER", "1") + .env_remove("PROFILE") + .current_dir(git_root.clone()) + .args([ @@ contrib/libgit-rs/libgit-sys/build.rs (new) + ); + } + std::fs::copy(crate_root.join("libgitpub.a"), dst.join("libgitpub.a"))?; -+ println!("cargo::rustc-link-search=native={}", dst.display()); -+ println!("cargo::rustc-link-lib=gitpub"); -+ println!("cargo::rerun-if-changed={}", git_root.display()); ++ println!("cargo:rustc-link-search=native={}", dst.display()); ++ println!("cargo:rustc-link-lib=gitpub"); ++ println!("cargo:rerun-if-changed={}", git_root.display()); + + Ok(()) +} @@ contrib/libgit-rs/libgit-sys/public_symbol_export.c (new) @@ +// Shim to publicly export Git symbols. These must be renamed so that the +// original symbols can be hidden. Renaming these with a "libgit_" prefix also -+// avoid conflicts with other libraries such as libgit2. ++// avoids conflicts with other libraries such as libgit2. + ++#include "git-compat-util.h" +#include "contrib/libgit-rs/libgit-sys/public_symbol_export.h" +#include "version.h" + @@ contrib/libgit-rs/libgit-sys/public_symbol_export.h (new) ## contrib/libgit-rs/libgit-sys/src/lib.rs (new) ## @@ ++#[cfg(has_std__ffi__c_char)] +use std::ffi::c_char; + ++#[cfg(not(has_std__ffi__c_char))] ++#[allow(non_camel_case_types)] ++pub type c_char = i8; ++ +extern crate libz_sys; + +extern "C" { -+ // From version.c + pub fn libgit_user_agent() -> *const c_char; + pub fn libgit_user_agent_sanitized() -> *const c_char; +} 3: 2ebff081f8 < -: ---------- libgit-sys: add repo initialization and config access 4: 6b4b7e6ced ! 3: 8eeab7b418 config: add git_configset_alloc() and git_configset_clear_and_free() @@ Metadata Author: Josh Steadmon ## Commit message ## - config: add git_configset_alloc() and git_configset_clear_and_free() + libgit-sys: also export some config_set functions - Add git_configset_alloc() and git_configset_clear_and_free() functions - so that callers can manage config_set structs on the heap. This also - allows non-C external consumers to treat config_sets as opaque structs. + In preparation for implementing a higher-level Rust API for accessing + Git configs, export some of the upstream configset API via libgitpub and + libgit-sys. Since this will be exercised as part of the higher-level API + in the next commit, no tests have been added for libgit-sys. + + While we're at it, add git_configset_alloc() and git_configset_free() + functions in libgitpub so that callers can manage config_set structs on + the heap. This also allows non-C external consumers to treat config_sets + as opaque structs. Co-authored-by: Calvin Wan Signed-off-by: Calvin Wan + Signed-off-by: Josh Steadmon - ## config.c ## -@@ config.c: static int config_set_element_cmp(const void *cmp_data UNUSED, - return strcmp(e1->key, e2->key); - } + ## contrib/libgit-rs/libgit-sys/public_symbol_export.c ## +@@ + // avoids conflicts with other libraries such as libgit2. + + #include "git-compat-util.h" ++#include "config.h" + #include "contrib/libgit-rs/libgit-sys/public_symbol_export.h" + #include "version.h" -+struct config_set *git_configset_alloc(void) + #pragma GCC visibility push(default) + ++struct libgit_config_set *libgit_configset_alloc(void) +{ -+ return xmalloc(sizeof(struct config_set)); ++ struct config_set *cs = xmalloc(sizeof(struct config_set)); ++ git_configset_init(cs); ++ return (struct libgit_config_set *) cs; +} + - void git_configset_init(struct config_set *set) - { - hashmap_init(&set->config_hash, config_set_element_cmp, NULL, 0); -@@ config.c: void git_configset_clear(struct config_set *set) - set->list.items = NULL; - } - -+void git_configset_clear_and_free(struct config_set *set) ++void libgit_configset_free(struct libgit_config_set *cs) ++{ ++ git_configset_clear((struct config_set *) cs); ++ free((struct config_set *) cs); ++} ++ ++int libgit_configset_add_file(struct libgit_config_set *cs, const char *filename) +{ -+ git_configset_clear(set); -+ free(set); ++ return git_configset_add_file((struct config_set *) cs, filename); +} + - static int config_set_callback(const char *key, const char *value, - const struct config_context *ctx, - void *cb) ++int libgit_configset_get_int(struct libgit_config_set *cs, const char *key, int *dest) ++{ ++ return git_configset_get_int((struct config_set *) cs, key, dest); ++} ++ ++int libgit_configset_get_string(struct libgit_config_set *cs, const char *key, char **dest) ++{ ++ return git_configset_get_string((struct config_set *) cs, key, dest); ++} ++ + const char *libgit_user_agent(void) + { + return git_user_agent(); + + ## contrib/libgit-rs/libgit-sys/public_symbol_export.h ## +@@ + #ifndef PUBLIC_SYMBOL_EXPORT_H + #define PUBLIC_SYMBOL_EXPORT_H + ++struct libgit_config_set *libgit_configset_alloc(void); ++ ++void libgit_configset_free(struct libgit_config_set *cs); ++ ++int libgit_configset_add_file(struct libgit_config_set *cs, const char *filename); ++ ++int libgit_configset_get_int(struct libgit_config_set *cs, const char *key, int *dest); ++ ++int libgit_configset_get_string(struct libgit_config_set *cs, const char *key, char **dest); ++ + const char *libgit_user_agent(void); + + const char *libgit_user_agent_sanitized(void); - ## config.h ## -@@ config.h: struct config_set { - struct configset_list list; - }; + ## contrib/libgit-rs/libgit-sys/src/lib.rs ## +@@ + #[cfg(has_std__ffi__c_char)] +-use std::ffi::c_char; ++use std::ffi::{c_char, c_int}; + + #[cfg(not(has_std__ffi__c_char))] + #[allow(non_camel_case_types)] + pub type c_char = i8; + ++#[cfg(not(has_std__ffi__c_char))] ++#[allow(non_camel_case_types)] ++pub type c_int = i32; ++ + extern crate libz_sys; -+/** -+ * Alloc a config_set -+ */ -+struct config_set *git_configset_alloc(void); -+ - /** - * Initializes the config_set `cs`. - */ -@@ config.h: int git_configset_get_string_multi(struct config_set *cs, const char *key, - */ - void git_configset_clear(struct config_set *cs); ++#[allow(non_camel_case_types)] ++#[repr(C)] ++pub struct libgit_config_set { ++ _data: [u8; 0], ++ _marker: core::marker::PhantomData<(*mut u8, core::marker::PhantomPinned)>, ++} ++ + extern "C" { + pub fn libgit_user_agent() -> *const c_char; + pub fn libgit_user_agent_sanitized() -> *const c_char; ++ ++ pub fn libgit_configset_alloc() -> *mut libgit_config_set; ++ pub fn libgit_configset_free(cs: *mut libgit_config_set); ++ ++ pub fn libgit_configset_add_file(cs: *mut libgit_config_set, filename: *const c_char) -> c_int; ++ ++ pub fn libgit_configset_get_int( ++ cs: *mut libgit_config_set, ++ key: *const c_char, ++ int: *mut c_int, ++ ) -> c_int; ++ ++ pub fn libgit_configset_get_string( ++ cs: *mut libgit_config_set, ++ key: *const c_char, ++ dest: *mut *mut c_char, ++ ) -> c_int; ++ + } -+/** -+ * Clears and frees a heap-allocated `config_set` structure. -+ */ -+void git_configset_clear_and_free(struct config_set *cs); -+ - /* - * These functions return 1 if not found, and 0 if found, leaving the found - * value in the 'dest' pointer. + #[cfg(test)] 5: 18fea79783 ! 4: 29599e9c7b libgit: add higher-level libgit crate @@ Commit message a more Rust-friendly interface to config_set structs. Co-authored-by: Josh Steadmon + Signed-off-by: Josh Steadmon Signed-off-by: Calvin Wan @@ contrib/libgit-rs/Cargo.lock (new) +version = 3 + +[[package]] ++name = "autocfg" ++version = "1.4.0" ++source = "registry+https://github.com/rust-lang/crates.io-index" ++checksum = "ace50bade8e6234aa140d9a2f552bbee1db4d353f69b8217bc503490fc1a9f26" ++ ++[[package]] +name = "cc" +version = "1.1.15" +source = "registry+https://github.com/rust-lang/crates.io-index" @@ contrib/libgit-rs/Cargo.lock (new) +name = "libgit" +version = "0.1.0" +dependencies = [ ++ "autocfg", + "libgit-sys", +] + @@ contrib/libgit-rs/Cargo.lock (new) +name = "libgit-sys" +version = "0.1.0" +dependencies = [ ++ "autocfg", + "libz-sys", ++ "make-cmd", +] + +[[package]] @@ contrib/libgit-rs/Cargo.lock (new) +] + +[[package]] ++name = "make-cmd" ++version = "0.1.0" ++source = "registry+https://github.com/rust-lang/crates.io-index" ++checksum = "a8ca8afbe8af1785e09636acb5a41e08a765f5f0340568716c18a8700ba3c0d3" ++ ++[[package]] +name = "pkg-config" +version = "0.3.30" +source = "registry+https://github.com/rust-lang/crates.io-index" @@ contrib/libgit-rs/Cargo.toml (new) +name = "libgit" +version = "0.1.0" +edition = "2021" ++build = "build.rs" ++rust-version = "1.63" + +[lib] +path = "src/lib.rs" + +[dependencies] +libgit-sys = { version = "0.1.0", path = "libgit-sys" } - - ## contrib/libgit-rs/libgit-sys/public_symbol_export.c ## -@@ contrib/libgit-rs/libgit-sys/public_symbol_export.c: int libgit_parse_maybe_bool(const char *val) - return git_parse_maybe_bool(val); - } - -+struct libgit_config_set *libgit_configset_alloc(void) -+{ -+ return git_configset_alloc(); -+} -+ -+void libgit_configset_clear_and_free(struct libgit_config_set *cs) -+{ -+ git_configset_clear_and_free(cs); -+} + -+void libgit_configset_init(struct libgit_config_set *cs) -+{ -+ git_configset_init(cs); -+} -+ -+int libgit_configset_add_file(struct libgit_config_set *cs, const char *filename) -+{ -+ return git_configset_add_file(cs, filename); -+} -+ -+int libgit_configset_get_int(struct libgit_config_set *cs, const char *key, int *dest) -+{ -+ return git_configset_get_int(cs, key, dest); -+} -+ -+int libgit_configset_get_string(struct libgit_config_set *cs, const char *key, char **dest) -+{ -+ return git_configset_get_string(cs, key, dest); -+} -+ - const char *libgit_user_agent(void) - { - return git_user_agent(); ++[build-dependencies] ++autocfg = "1.4.0" - ## contrib/libgit-rs/libgit-sys/public_symbol_export.h ## -@@ contrib/libgit-rs/libgit-sys/public_symbol_export.h: void libgit_init_git(const char **argv); - - int libgit_parse_maybe_bool(const char *val); - -+struct libgit_config_set *libgit_configset_alloc(void); -+ -+void libgit_configset_clear_and_free(struct libgit_config_set *cs); -+ -+void libgit_configset_init(struct libgit_config_set *cs); -+ -+int libgit_configset_add_file(struct libgit_config_set *cs, const char *filename); -+ -+int libgit_configset_get_int(struct libgit_config_set *cs, const char *key, int *dest); -+ -+int libgit_configset_get_string(struct libgit_config_set *cs, const char *key, char **dest); -+ - const char *libgit_user_agent(void); - - const char *libgit_user_agent_sanitized(void); + ## contrib/libgit-rs/build.rs (new) ## +@@ ++pub fn main() { ++ let ac = autocfg::new(); ++ ac.emit_has_path("std::ffi::c_char"); ++} ## contrib/libgit-rs/libgit-sys/src/lib.rs ## @@ --use std::ffi::{c_char, c_int}; -+use std::ffi::{c_char, c_int, c_void}; ++use std::ffi::c_void; + -+#[allow(non_camel_case_types)] -+#[repr(C)] -+pub struct libgit_config_set { -+ _data: [u8; 0], -+ _marker: core::marker::PhantomData<(*mut u8, core::marker::PhantomPinned)>, -+} + #[cfg(has_std__ffi__c_char)] + use std::ffi::{c_char, c_int}; - extern crate libz_sys; +@@ contrib/libgit-rs/libgit-sys/src/lib.rs: pub struct libgit_config_set { + } extern "C" { + pub fn free(ptr: *mut c_void); + - pub fn libgit_setup_git_directory() -> *const c_char; - - // From config.c -@@ contrib/libgit-rs/libgit-sys/src/lib.rs: extern "C" { - // From version.c pub fn libgit_user_agent() -> *const c_char; pub fn libgit_user_agent_sanitized() -> *const c_char; -+ -+ pub fn libgit_configset_alloc() -> *mut libgit_config_set; -+ pub fn libgit_configset_clear_and_free(cs: *mut libgit_config_set); -+ -+ pub fn libgit_configset_init(cs: *mut libgit_config_set); -+ -+ pub fn libgit_configset_add_file(cs: *mut libgit_config_set, filename: *const c_char) -> c_int; -+ -+ pub fn libgit_configset_get_int( -+ cs: *mut libgit_config_set, -+ key: *const c_char, -+ int: *mut c_int, -+ ) -> c_int; -+ -+ pub fn libgit_configset_get_string( -+ cs: *mut libgit_config_set, -+ key: *const c_char, -+ dest: *mut *mut c_char, -+ ) -> c_int; -+ - } - #[cfg(test)] ## contrib/libgit-rs/src/lib.rs (new) ## @@ -+use std::ffi::{c_char, c_int, c_void, CStr, CString}; ++use std::ffi::{c_void, CStr, CString}; +use std::path::Path; + ++#[cfg(has_std__ffi__c_char)] ++use std::ffi::{c_char, c_int}; ++ ++#[cfg(not(has_std__ffi__c_char))] ++#[allow(non_camel_case_types)] ++pub type c_char = i8; ++ ++#[cfg(not(has_std__ffi__c_char))] ++#[allow(non_camel_case_types)] ++pub type c_int = i32; ++ +use libgit_sys::*; + +pub struct ConfigSet(*mut libgit_config_set); +impl ConfigSet { + pub fn new() -> Self { -+ unsafe { -+ let ptr = libgit_configset_alloc(); -+ libgit_configset_init(ptr); -+ ConfigSet(ptr) -+ } ++ unsafe { ConfigSet(libgit_configset_alloc()) } + } + + pub fn add_files(&mut self, files: &[&Path]) { + for file in files { -+ let pstr: &str = file.to_str().expect("Invalid UTF-8"); -+ let rs = CString::new(&*pstr).expect("Couldn't convert to CString"); ++ let pstr = file.to_str().expect("Invalid UTF-8"); ++ let rs = CString::new(pstr).expect("Couldn't convert to CString"); + unsafe { + libgit_configset_add_file(self.0, rs.as_ptr()); + } @@ contrib/libgit-rs/src/lib.rs (new) + Some(val) + } + -+ pub fn get_str(&mut self, key: &str) -> Option { -+ let key = CString::new(key).expect("Couldn't convert to CString"); ++ pub fn get_string(&mut self, key: &str) -> Option { ++ let key = CString::new(key).expect("Couldn't convert key to CString"); + let mut val: *mut c_char = std::ptr::null_mut(); + unsafe { + if libgit_configset_get_string(self.0, key.as_ptr(), &mut val as *mut *mut c_char) != 0 @@ contrib/libgit-rs/src/lib.rs (new) + return None; + } + let borrowed_str = CStr::from_ptr(val); -+ let owned_str = CString::from_vec_with_nul(borrowed_str.to_bytes_with_nul().to_vec()); ++ let owned_str = ++ String::from(borrowed_str.to_str().expect("Couldn't convert val to str")); + free(val as *mut c_void); // Free the xstrdup()ed pointer from the C side -+ Some(owned_str.unwrap()) ++ Some(owned_str) + } + } +} @@ contrib/libgit-rs/src/lib.rs (new) +impl Drop for ConfigSet { + fn drop(&mut self) { + unsafe { -+ libgit_configset_clear_and_free(self.0); ++ libgit_configset_free(self.0); + } + } +} @@ contrib/libgit-rs/src/lib.rs (new) + #[test] + fn load_configs_via_configset() { + let mut cs = ConfigSet::new(); -+ cs.add_files(&[Path::new("testdata/config1"), -+ Path::new("testdata/config2"), -+ Path::new("testdata/config3")]); -+ // ConfigSet retrieves correct value ++ cs.add_files(&[ ++ Path::new("testdata/config1"), ++ Path::new("testdata/config2"), ++ Path::new("testdata/config3"), ++ ]); ++ // ConfigSet retrieves correct value + assert_eq!(cs.get_int("trace2.eventTarget"), Some(1)); + // ConfigSet respects last config value set + assert_eq!(cs.get_int("trace2.eventNesting"), Some(3)); + // ConfigSet returns None for missing key -+ assert_eq!(cs.get_str("foo.bar"), None); ++ assert_eq!(cs.get_string("foo.bar"), None); + } +} 6: 67c11dd143 ! 5: 2ed503216f Makefile: add option to build and test libgit-rs and libgit-rs-sys @@ Commit message automatically builds and tests libgit-rs and libgit-rs-sys when `make all` is ran. Signed-off-by: Calvin Wan ## Makefile ## base-commit: 557ae147e6cdc9db121269b058c757ac5092f9c9