Add support for Alpine to `git` feature (#1008)

* feat: add basic scaffolding for alpine, based on debian implementation

* feat: add baseline packages from <https://github.com/alpinelinux/aports/blob/master/main/git/APKBUILD>

* fix: add `curl` package (needed for version lookup)

* feat: use `jq`-based version matching implementation for alpine

the alpine version of `grep` doesn't support PCRE

* fix: forgot to strip the leading "v" from the version number

* fix: need `make` package to build from source

* feat: parameterize make options to easily inject Alpine-specific option

* fix: wip: latest baseline (still breaking due to musl)

* feat: add basic scaffolding for alpine, based on debian implementation

note: this won't install from source (due to build issues with musl) but will install using the `apk` package manager

* chore: chmod +x

* chore: bump semver (proposed)

* docs: add Alpine/apk to notes

* test: add test for `alpine:3` to install system package

note: feature does not currently implement building from source on Alpine

* fix: working build from source!

still need to tweak the package dependencies and make config

* perf: remove OBE `gettext-dev` package from dependencies

no longer required with "NO_GETTEXT=YesPlease" make config

* perf: remove OBE `libintl` package from dependencies

no longer required with "NO_GETTEXT=YesPlease" make config (?)

* feat: add remaining make options from apk package source reference

* docs: add refs. for alpine build from source

* test(git): add test case for building git from src on alpine:3

* fix: lint: SC2068: Double quote array expansions to avoid re-splitting elements

* fix: use Devcontainer Alpine image as base (because it has `bash` installed); refactor test script names to remove major version suffix (since it isn't specified in the associated image tag)

* perf: consolidate to a single, jq-based implementation

using `jq` avoids the need for PCRE `grep` expression (not supported in Alpine)

* fix: set `sysconfdir` option for alpine build as well

see [#395](https://github.com/devcontainers/features/pull/395)

* test: fix: alpine doesn't include perl support; leverage test cases from `install_git_from_src.sh` script

* style: remove unused options

* fix: set `prefix` option for alpine build to be consistent with other builds

see [#395](https://github.com/devcontainers/features/pull/395)

* refactor: move common arguments out of distro-specific logic

* perf: minimum set of make options for building git from source in Alpine

* chore: remove OBE code (unused make options for Git)

* style: whitespace

* test: fix: remove `gettext` check (since this package isn't installed in Alpine)

* feat: update implementation based on local Git feature in `base-alpine` image

* feat: remove `libsecret-dev` package

not present in local Git feature in `base-alpine` image `install.sh` script

* feat: switch `glib-dev` to `g++` and `gcc` packages, based on local Git feature in `base-alpine` image

* chore: remove `alpine-sdk` package, based on local Git feature in `base-alpine` image

no longer needed, based on initial testing

* revert: switch back to `grep`-based PCRE implementation,  based on local Git feature in `base-alpine` image

`jq` package no longer needed

* test: revert: remove test cases (covered by generic `install_git_from_src.sh`)

* test: fix: remove perl check for system package in Alpine (because the system package is not built with PCRE support)

---------
Co-authored-by: Samruddhi Khandale <skhandale@microsoft.com>

src/git/NOTES.md

@@ -2,6 +2,6 @@
 
 ## OS Support
 
-This Feature should work on recent versions of Debian/Ubuntu, RedHat Enterprise Linux, Fedora, Alma, and RockyLinux distributions with the `apt`, `yum`, `dnf`, or `microdnf` package manager installed.
+This Feature should work on recent versions of Alpine, Debian/Ubuntu, RedHat Enterprise Linux, Fedora, Alma, and RockyLinux distributions with the `apk`, `apt`, `yum`, `dnf`, or `microdnf` package manager installed.
 
 `bash` is required to execute the `install.sh` script.

src/git/devcontainer-feature.json

 {
     "id": "git",
-    "version": "1.2.1",
+    "version": "1.3.0",
     "name": "Git (from source)",
     "documentationURL": "https://github.com/devcontainers/features/tree/main/src/git",
     "description": "Install an up-to-date version of Git, built from source as needed. Useful for when you want the latest and greatest features. Auto-detects latest stable version and installs needed dependencies.",

src/git/install.sh

@@ -26,6 +26,8 @@ fi
 # Get an adjusted ID independent of distro variants
 if [ "${ID}" = "debian" ] || [ "${ID_LIKE}" = "debian" ]; then
     ADJUSTED_ID="debian"
+elif [ "${ID}" = "alpine" ]; then
+    ADJUSTED_ID="alpine"
 elif [[ "${ID}" = "rhel" || "${ID}" = "fedora" || "${ID}" = "mariner" || "${ID_LIKE}" = *"rhel"* || "${ID_LIKE}" = *"fedora"* || "${ID_LIKE}" = *"mariner"* ]]; then
     ADJUSTED_ID="rhel"
     VERSION_CODENAME="${ID}{$VERSION_ID}"
@@ -36,6 +38,8 @@ fi
 
 if type apt-get > /dev/null 2>&1; then
     INSTALL_CMD=apt-get
+elif type apk > /dev/null 2>&1; then
+    INSTALL_CMD=apk
 elif type microdnf > /dev/null 2>&1; then
     INSTALL_CMD=microdnf
 elif type dnf > /dev/null 2>&1; then
@@ -53,6 +57,9 @@ clean_up() {
         debian)
             rm -rf /var/lib/apt/lists/*
             ;;
+        alpine)
+            rm -rf /var/cache/apk/*
+            ;;
         rhel)
             rm -rf /var/cache/dnf/*
             rm -rf /var/cache/yum/*
@@ -102,6 +109,11 @@ pkg_mgr_update() {
             echo "Running apt-get update..."
             ${INSTALL_CMD} update -y
         fi
+    elif [ ${INSTALL_CMD} = "apk" ]; then
+        if [ "$(find /var/cache/apk/* | wc -l)" = "0" ]; then
+            echo "Running apk update..."
+            ${INSTALL_CMD} update
+        fi
     elif [ ${INSTALL_CMD} = "dnf" ] || [ ${INSTALL_CMD} = "yum" ]; then
         if [ "$(find /var/cache/${INSTALL_CMD}/* | wc -l)" = "0" ]; then
             echo "Running ${INSTALL_CMD} check-update ..."
@@ -118,6 +130,10 @@ check_packages() {
             pkg_mgr_update
             ${INSTALL_CMD} -y install --no-install-recommends "$@"
         fi
+    elif [ ${INSTALL_CMD} = "apk" ]; then
+        ${INSTALL_CMD} add \
+            --no-cache \
+            "$@"
     elif [ ${INSTALL_CMD} = "dnf" ] || [ ${INSTALL_CMD} = "yum" ]; then
         _num_pkgs=$(echo "$@" | tr ' ' \\012 | wc -l)
         _num_installed=$(${INSTALL_CMD} -C list installed "$@" | sed '1,/^Installed/d' | wc -l)
@@ -154,6 +170,8 @@ if [ ${GIT_VERSION} = "os-provided" ] || [ ${GIT_VERSION} = "system" ]; then
 
     if [ "$INSTALL_CMD" = "apt-get" ]; then
         echo "Installing git from OS apt repository"
+    elif [ "$INSTALL_CMD" = "apk" ]; then
+        echo "Installing git from OS apk repository"
     else
         echo "Installing git from OS yum/dnf repository"
     fi
@@ -194,6 +212,14 @@ if [ "${ADJUSTED_ID}" = "debian" ]; then
         check_packages libpcre2-posix3
     fi
 
+elif [ "${ADJUSTED_ID}" = "alpine" ]; then
+
+    # update build dependencies
+    ${INSTALL_CMD} add --no-cache --update curl grep make zlib-dev
+
+    # ref. <https://github.com/alpinelinux/aports/blob/32ac93ffb642031b88ba8639fbb3abb324169dea/main/git/APKBUILD#L62>
+    check_packages asciidoc curl-dev expat-dev g++ gcc openssl-dev pcre2-dev perl-dev perl-error python3-dev tcl tk xmlto
+
 elif [ "${ADJUSTED_ID}" = "rhel" ]; then
 
     if [ $VERSION_CODENAME = "centos7" ]; then
@@ -212,6 +238,10 @@ elif [ "${ADJUSTED_ID}" = "rhel" ]; then
     if [ $ID = "mariner" ]; then
         check_packages glibc-devel kernel-headers binutils
     fi
+
+else
+    echo "Linux distro ${ID} not supported."
+    exit 1
 fi
 
 # Partial version matching
@@ -235,7 +265,15 @@ echo "Downloading source for ${GIT_VERSION}..."
 curl -sL https://github.com/git/git/archive/v${GIT_VERSION}.tar.gz | tar -xzC /tmp 2>&1
 echo "Building..."
 cd /tmp/git-${GIT_VERSION}
-make -s USE_LIBPCRE=YesPlease prefix=/usr/local sysconfdir=/etc all && make -s USE_LIBPCRE=YesPlease prefix=/usr/local sysconfdir=/etc install 2>&1
+git_options=("prefix=/usr/local")
+git_options+=("sysconfdir=/etc")
+git_options+=("USE_LIBPCRE=YesPlease")
+if [ "${ADJUSTED_ID}" = "alpine" ]; then
+    # ref. <https://github.com/alpinelinux/aports/blob/32ac93ffb642031b88ba8639fbb3abb324169dea/main/git/APKBUILD#L126>
+    git_options+=("NO_REGEX=YesPlease")
+    git_options+=("NO_GETTEXT=YesPlease")
+fi
+make -s "${git_options[@]}" all && make -s "${git_options[@]}" install 2>&1
 rm -rf /tmp/git-${GIT_VERSION}
 clean_up
 echo "Done!"

test/git/install_git_from_src_alpine.sh

+#!/bin/bash
+
+set -e
+
+# Optional: Import test library
+source dev-container-features-test-lib
+
+# Definition specific tests
+check "version" git --version
+
+cd /tmp && git clone https://github.com/devcontainers/feature-starter.git
+cd feature-starter
+check "perl" bash -c "git -c grep.patternType=perl grep -q 'a.+b'"
+
+# Report result
+reportResults

test/git/install_git_from_system_alpine.sh

+#!/bin/bash
+
+set -e
+
+# Optional: Import test library
+source dev-container-features-test-lib
+
+# Definition specific tests
+check "version" git  --version
+
+cd /tmp && git clone https://github.com/devcontainers/feature-starter.git
+cd feature-starter
+
+# Report result
+reportResults

test/git/scenarios.json

@@ -8,6 +8,15 @@
             }
         }
     },
+    "install_git_from_src_alpine": {
+        "image": "mcr.microsoft.com/devcontainers/base:alpine",
+        "features": {
+            "git": {
+                "version": "latest",
+                "ppa": "false"
+            }
+        }
+    },
     "install_git_from_src_jammy": {
         "image": "ubuntu:jammy",
         "features": {
@@ -107,6 +116,15 @@
             }
         }
     },
+    "install_git_from_system_alpine": {
+        "image": "mcr.microsoft.com/devcontainers/base:alpine",
+        "features": {
+            "git": {
+                "version": "system",
+                "ppa": "false"
+            }
+        }
+    },
     "install_git_from_system_centos-7": {
         "image": "centos:centos7",
         "features": {