#### Problem:
The current `CMAKE_INSTALL_PREFIX` value for the `system` build mode is `/usr`. However, in`macOS` as an example, you cannot write to `/usr` without `sudo` permission.
#### Proposed solution:
Enable changing the value to `/usr/local` (or any other path). This change makes the script use the value of the environment variable `SYSTEM_INSTALL_PREFIX` to select the installation path. If the variable is not set, it fallback to the path `/usr`.
### What this change is doing?
This change aims to enable us to set the `VENDORED_PATH` as an environment variable and failback to the default value if the environment variable is not set. Thus, this change should not break current behavior.
### Why we need this?
This will enable using the script to build libgit2 form source code downloaded manually.
Example:
```sh
LIBGIT2_VER="1.0.1"
DOWNLOAD_URL="https://codeload.github.com/libgit2/libgit2/tar.gz/v${LIBGIT2_VER}""
LIBGIT2_PATH="${HOME}/libgit2-${LIBGIT2_VER}"
wget -O "${LIBGIT2_PATH}.tar.gz" "$DOWNLOAD_URL"
tar -xzvf "${LIBGIT2_PATH}.tar.gz"
VENDORED_PATH=$LIBGIT2_PATH sh ./script/build-libgit2.sh --static
```
This change:
* Builds the library with Go 1.14, too.
* Builds the non-legacy tests with Ubuntu Focal (20.04).
* Adds testing for system-wide libraries, both static and dynamic
versions.
* Fixes a typo in the README.
Upstream libgit2 has migrated to use the GNUInstallDirs module to decide
where things will be installed to by default. While it improves
consistency with the host system, we're not really after that when
building the vendored libgit2 library, and in fact libgit2.{a,pc} may
now be installed into a different directory than before as it started to
depend on the host platform.
Fix this by explicitly specifying that we want the library and pkgconfig
file to be installed into a plain "lib/" directory.
This change removes the `LIB_INSTALL_DIR` and `INCLUDE_INSTALL_DIR` from
the `script/build-libgit2.sh` script, since they are now unneeded and
just print a warning if they are used.
This change:
* Updates the GitHub actions so that they run different commands for the
dynamic and static flavors of libgit2.
* Updates the .travis.yml file so that it does roughly the same as the
GitHub actions.
* Adds the release-* branches to the CI configurations.
This change:
* Uses the installed version of both the library and the pkgconfig file,
which fixes path resolution on Ubuntu Xenial.
* Uses quoting liberally so that paths with spaces in them are correctly
handled.
* Moves the build+install directories to static-build/ in the git2go
repository to avoid having a dirty vendor/libgit2 checkout.
When using the static linking option on platforms that use pkg-config,
use ONLY pkg-config to get the CFLAGS and LDFLAGS. This prevents pulling
in dependencies and flags for any non-vendored version that may be
present on the host.
The main practical effect of this is that if someone doesn't need/want
any sort of remote access support at all they can completely disable
libcurl, libssh2, libssl, etc and produce a smaller/simpler binary and
greatly simplify their build-time dependencies. When done properly, the
generated pkg-config file will tell cgo everything it needs to know.
This also prevents confusion if there is a system copy of libgit2 that
is being given priority over the vendored build.
Signed-off-by: Ryan Graham <r.m.graham@gmail.com>
CGO can perform variable substitution in the directives, so we don't
need to use a script to set up the variables; we can let the go tool do
it for us.
We have our own libgit2 in a submodule, so this is unnecessary. While in
the area, update which version of libgit2 would be downloaded and remove
unnecessary CMake flags.
The cgo directives let us do a lot more than I previously thought, so we
can use this to make the building process of git2go go through the go
tool directly rather than via the script.
libgit2 still needs to be built manually, so we do still require make,
but only for building libgit2. Once that's built, any modifications to
git2go's own code can be built with
go build
Suhaib Mujahid
lhchavez
Patrick Steinhardt
Carlos Martín Nieto
Jon Miller
Ryan Graham
Carlos Martín Nieto
Dmitri Shuralyov
Quinn Slack
Matthias Kadenbach