dependencies

packages/libncurses.shrap

@@ -0,0 +1,11 @@
+(package
+    (name "ncurses")
+    (version "6.6")
+    (homepage "https://invisible-island.net/ncurses/")
+    (src (tar
+        (url "https://invisible-mirror.net/archives/ncurses/ncurses-6.6.tar.gz")
+        (dir "ncurses-6.6")
+        (blake3 "")))
+    (build
+        (configure_make
+            (configure_flags "--disable-widec --without-tests --without-progs --without-manpages"))))

packages/vim.shrap

@@ -0,0 +1,11 @@
+(package
+    (name "vim")
+    (version "9.1.2148")
+    (homepage "https://www.vim.org/")
+    (dependencies "libncurses")
+    (src (tar
+        (url "https://github.com/vim/vim/archive/refs/tags/v9.1.2148.tar.gz")
+        (dir "vim-9.1.2148")
+        (blake3 "")))
+    (build
+        (configure_make)))

packages/zlib.shrap

@@ -0,0 +1,10 @@
+(package
+    (name "zlib")
+    (version "1.3.1")
+    (homepage "https://zlib.net/")
+    (src (tar
+        (url "https://zlib.net/zlib-1.3.1.tar.gz")
+        (dir "zlib-1.3.1")
+        (blake3 "207c3b0862cb4e3686f8405f76a98c38dbad9c94bcf4be4b9efca0716aba51ec")))
+    (build
+        (configure_make)))

src/main.cc

@@ -2,28 +2,31 @@
 #include "util.h"
 #include <fstream>
 #include <iostream>
+#include <span>
+#include <stdexcept>
 #include <sys/stat.h>
 #include <thread>
 
-int main() {
-  if (geteuid() != 0) {
-    std::cerr << "This program needs to be ran as root.\n";
-    return 1;
-  }
-  mkdir("/tmp/shrap", 0777);
-
-  std::ifstream file("zlib.shrap");
+void install_package(const std::string &name) {
+  std::ifstream file("packages/" + name + ".shrap");
   if (!file) {
-    std::cerr << "Error opening file\n";
-    return 1;
+    std::cerr << "Package " << name << "not found.\n";
+    std::exit(1);
   }
 
   Expr pkg = Expr::parse(file);
 
+  try {
+    for (const auto &dep : pkg.get("dependencies").children) {
+      install_package(dep.value);
+    }
+  } catch (std::out_of_range &) {
+  }
+
   Expr src = pkg.get("src").children[0];
   std::string src_type = src.children[0].value;
-  std::string src_url = src.children[1].value;
-  std::string src_path = "/tmp/shrap/" + src.children[2].value;
+  std::string src_url = src.get("url").children[0].value;
+  std::string src_path = "/tmp/shrap/" + src.get("dir").children[0].value;
 
   if (src_type == "tar") {
     std::string archive_path = "/tmp/shrap/" + Util::basename(src_url);
@@ -31,12 +34,11 @@ int main() {
     // TODO: replace wget with a library for zero runtime dependencies
     Util::shell_command("wget -O " + archive_path + " " + src_url);
 
-    // TODO: check archive hash from src.children[3].value
+    // TODO: check archive hash from src.get("blake3").children[0].value
 
     Util::shell_command("tar xf " + archive_path + " -C /tmp/shrap/");
   } else {
-    std::cerr << "ERROR: unrecognized src type: " << src_type << "\n";
-    return 1;
+    throw std::runtime_error("unrecognized src type");
   }
 
   std::string jobs = std::to_string(std::thread::hardware_concurrency());
@@ -45,12 +47,35 @@ int main() {
     std::string step_type = step.children[0].value;
 
     if (step_type == "configure_make") {
-      Util::shell_command("./configure --prefix=/usr", src_path);
+      std::string configure_flags;
+      try {
+        configure_flags = step.get("configure_flags").children[0].value;
+      } catch (std::out_of_range &) {
+      }
+
+      Util::shell_command("./configure --prefix=/usr " + configure_flags,
+                          src_path);
       Util::shell_command("make -j " + jobs, src_path);
       Util::shell_command("make install", src_path);
     } else {
-      std::cerr << "ERROR: unrecognized step type: " << step_type << "\n";
-      return 1;
+      throw std::runtime_error("unrecognized step type");
     }
   }
 }
+
+int main(int argc, char **argv) {
+  auto args = std::span(argv, static_cast<size_t>(argc));
+
+  if (geteuid() != 0) {
+    std::cerr << "This program needs to be ran as root.\n";
+    return 1;
+  }
+  Util::shell_command("mkdir -p /tmp/shrap");
+
+  try {
+    install_package(args[1]);
+  } catch (std::exception &e) {
+    std::cerr << "ERROR: " << e.what() << std::endl;
+    return 1;
+  }
+}

src/parser.h

@@ -25,7 +25,7 @@ public:
         return result;
       }
     }
-    throw std::runtime_error("key not found: " + key);
+    throw std::out_of_range("key not found: " + key);
   }
 
   static Expr parse(std::istream &in) { return parse_expr(in); }

src/util.h

@@ -1,16 +1,18 @@
 #pragma once
 
+#include <iostream>
 #include <string>
 #include <sys/wait.h>
 #include <unistd.h>
 
 namespace Util {
 
-static int shell_command(const std::string &cmd, const std::string &dir = ".") {
+static void shell_command(const std::string &cmd,
+                          const std::string &dir = ".") {
   pid_t pid = fork();
   if (pid < 0) {
     perror("fork failed");
-    return -1;
+    std::exit(1);
   }
 
   if (pid == 0) {
@@ -27,9 +29,13 @@ static int shell_command(const std::string &cmd, const std::string &dir = ".") {
     int status = 0;
     if (waitpid(pid, &status, 0) < 0) {
       perror("waitpid failed");
-      return -1;
+      std::exit(1);
+    }
+    if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
+      std::cerr << "Command failed with exit code " << WEXITSTATUS(status)
+                << "\n";
+      std::exit(1);
     }
-    return WIFEXITED(status) ? WEXITSTATUS(status) : -1;
   }
 }
 

zlib.shrap

@@ -1,7 +0,0 @@
-(package
-    (name "zlib")
-    (version "1.3.1")
-    (homepage "https://zlib.net/")
-    (src (tar "https://zlib.net/zlib-1.3.1.tar.gz" "zlib-1.3.1" "207c3b0862cb4e3686f8405f76a98c38dbad9c94bcf4be4b9efca0716aba51ec"))
-    (build
-        (configure_make)))