Patch about auto gen version string (#114)

* new: about app中，显示当前构建的git commit sha1以及构建时间

* bugfix: 修复shell的exec命令对绝对路径的拼接错误问题

Author: fslongjin

.vscode/settings.json

@@ -168,8 +168,9 @@
         "mmio.h": "c",
         "stdint-gcc.h": "c",
         "acpi.h": "c",
-        "assert.h": "c"
-    },
+        "assert.h": "c",
+        "sys_version.h": "c"
+},
     "C_Cpp.errorSquiggles": "Enabled",
     "esbonio.sphinx.confDir": "",
     "rust-analyzer.cargo.target": "x86_64-unknown-none",

user/apps/about/.gitignore

@@ -0,0 +1 @@
+sys_version.h

user/apps/about/Makefile

@@ -1,7 +1,15 @@
+# 获得当前git提交的sha1,并截取前8位
+GIT_COMMIT_SHA1=$(shell git log -n 1 | head -n 1 | cut -d ' ' -f 2 | cut -c1-8)
+
 all: about.o
 
 	ld -b elf64-x86-64 -z muldefs -o $(tmp_output_dir)/about  $(shell find . -name "*.o") $(shell find $(sys_libs_dir) -name "*.o") -T about.lds
 
 	objcopy -I elf64-x86-64 -R ".eh_frame" -R ".comment" -O elf64-x86-64 $(tmp_output_dir)/about $(output_dir)/about.elf
-about.o: about.c
+
+about.o: version_header about.c
 	$(CC) $(CFLAGS) -c about.c  -o about.o
+
+# 生成版本头文件sys_version.h
+version_header: about.c
+	@echo "#define DRAGONOS_GIT_COMMIT_SHA1 \"$(GIT_COMMIT_SHA1)\"" > sys_version.h

user/apps/about/about.c

@@ -1,3 +1,4 @@
+#include "sys_version.h"    // 这是系统的版本头文件，在编译过程中自动生成
 #include <libc/src/math.h>
 #include <libc/src/stdio.h>
 #include <libc/src/stdlib.h>
@@ -18,8 +19,10 @@ void print_copyright()
     printf(" DragonOS - An opensource operating system.\n");
     printf(" Copyright: fslongjin & DragonOS Community. 2022, All rights reserved.\n");
     printf(" Version: ");
-    put_string("V0.1.1 - 20221127\n", COLOR_GREEN, COLOR_BLACK);
-    printf(" You can visit the project via:\n");
+    put_string("V0.1.2\n", COLOR_GREEN, COLOR_BLACK);
+    printf(" Git commit SHA1: %s\n", DRAGONOS_GIT_COMMIT_SHA1);
+    printf(" Build time: %s %s\n", __DATE__, __TIME__);
+    printf(" \nYou can visit the project via:\n");
     printf("\n");
     put_string("    Official Website: https://DragonOS.org\n", COLOR_INDIGO, COLOR_BLACK);
     put_string("    GitHub: https://github.com/fslongjin/DragonOS\n", COLOR_ORANGE, COLOR_BLACK);
@@ -34,13 +37,9 @@ void print_copyright()
 
 int main()
 {
-    // printf("Hello World!\n");
     print_ascii_logo();
 
     print_copyright();
-    // exit(0);
-    // while (1)
-    //     ;
 
     return 0;
 }

user/apps/shell/cmd.c

@@ -39,26 +39,38 @@ const static int total_built_in_cmd_num = sizeof(shell_cmds) / sizeof(struct bui
  */
 static char *get_target_filepath(const char *filename, int *result_path_len)
 {
-    int cwd_len = strlen(shell_current_path);
+    char *file_path = NULL;
+    if (filename[0] != '/')
+    {
+        int cwd_len = strlen(shell_current_path);
 
-    // 计算文件完整路径的长度
-    *result_path_len = cwd_len + strlen(filename);
+        // 计算文件完整路径的长度
+        *result_path_len = cwd_len + strlen(filename);
 
-    char *file_path = (char *)malloc(*result_path_len + 2);
+        file_path = (char *)malloc(*result_path_len + 2);
 
-    memset(file_path, 0, *result_path_len + 2);
+        memset(file_path, 0, *result_path_len + 2);
 
-    strcpy(file_path, shell_current_path);
+        strncpy(file_path, shell_current_path, cwd_len);
 
-    // 在文件路径中加入斜杠
-    if (cwd_len > 1)
-        file_path[cwd_len] = '/';
+        // 在文件路径中加入斜杠
+        if (cwd_len > 1)
+            file_path[cwd_len] = '/';
 
-    // 拼接完整路径
-    if (filename[0] == '/')
-        strcat(file_path, filename + 1);
-    else
+        // 拼接完整路径
         strcat(file_path, filename);
+    }
+    else
+    {
+        *result_path_len = strlen(filename);
+        file_path = (char *)malloc(*result_path_len + 2);
+
+        memset(file_path, 0, *result_path_len + 2);
+
+        strncpy(file_path, filename, *result_path_len);
+        if(filename[(*result_path_len)-1]!='/')
+            file_path[*result_path_len] = '/';
+    }
 
     return file_path;
 }
@@ -483,7 +495,8 @@ int shell_cmd_exec(int argc, char **argv)
         // 如果不指定后台运行,则等待退出
         if (strcmp(argv[argc - 1], "&") != 0)
             waitpid(pid, &retval, 0);
-        else{
+        else
+        {
             // 输出子进程的pid
             printf("[1] %d\n", pid);
         }