Linux 补丁命令:patch 用法

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Linux patch 命令用于为软件打补丁,使用 diff 命令获取软件的变更。patch 是linux核心升级的方法之一。下面介绍如何制作和应用patch补丁。

安装

yum install -y patch

help

补丁制作命令 diff

diff 可以比较两个文件或文件夹的区别。制作补丁时的一般用法和常见选项为:

diff [选项] 源文件(夹) 目的文件(夹)
  • -r 递归,设置后 diff 会将源/目的文件夹的全部文件进行比较,包括子目录中文件
  • -N 确保补丁文件正确地处理创建或删除文件的情况
  • -u 输出每个修改前后行数,-u 3 :输出修改前后 3 行
  • -忽略内容
    • -i, –ignore-case ignore case differences in file contents
    • -E, –ignore-tab-expansion ignore changes due to tab expansion
    • -Z, –ignore-trailing-space ignore white space at line end
    • -b, –ignore-space-change ignore changes in the amount of white space
    • -w, –ignore-all-space ignore all white space
    • -B, –ignore-blank-lines ignore changes where lines are all blank
    • -I, –ignore-matching-lines=RE ignore changes where all lines match RE
    • –strip-trailing-cr strip trailing carriage return on input

补丁制作命令 git diff

$ git diff > mock.patch
$ cat mock.patch
diff --git a/origin.txt b/origin.txt
index bdf5010..fba3718 100644
--- a/origin.txt  # --- 表示旧文件
+++ b/origin.txt  # +++ 表示新文件
@@ -1,3 +1,3 @@   # 修改的信息
 hello line 1  # 原始文件默认做进一个空格
-this is origin file  # - 表示删除的行
+this is new file  # +表示新增的行
 hello line 2

补丁制作命令 git format-patch

使用 git format-patch 生成相关 patch,示例如下:

# 最近1次提交
git format-patch HEAD^

# 最近2次提交
git format-patch HEAD^^

# 生成指定(不含)提交之后的所有提交
git format-patch <commit>

# 生成指定(含)提交
git format-patch -1 <commit>

# 生成指定(含)提交之前的n次提交
git format-patch -n <commit>

patch命令

patch--help
$ patch --help
Usage: patch [OPTION]... [ORIGFILE [PATCHFILE]]

Input options:

  -p NUM  --strip=NUM  Strip NUM leading components from file names.
  -F LINES  --fuzz LINES  Set the fuzz factor to LINES for inexact matching.
  -l  --ignore-whitespace  Ignore white space changes between patch and input.

  -c  --context  Interpret the patch as a context difference.
  -e  --ed  Interpret the patch as an ed script.
  -n  --normal  Interpret the patch as a normal difference.
  -u  --unified  Interpret the patch as a unified difference.

  -N  --forward  Ignore patches that appear to be reversed or already applied.
  -R  --reverse  Assume patches were created with old and new files swapped.

  -i PATCHFILE  --input=PATCHFILE  Read patch from PATCHFILE instead of stdin.

Output options:

  -o FILE  --output=FILE  Output patched files to FILE.
  -r FILE  --reject-file=FILE  Output rejects to FILE.

  -D NAME  --ifdef=NAME  Make merged if-then-else output using NAME.
  --merge  Merge using conflict markers instead of creating reject files.
  -E  --remove-empty-files  Remove output files that are empty after patching.

  -Z  --set-utc  Set times of patched files, assuming diff uses UTC (GMT).
  -T  --set-time  Likewise, assuming local time.

  --quoting-style=WORD   output file names using quoting style WORD.
    Valid WORDs are: literal, shell, shell-always, c, escape.
    Default is taken from QUOTING_STYLE env variable, or 'shell' if unset.

Backup and version control options:

  -b  --backup  Back up the original contents of each file.
  --backup-if-mismatch  Back up if the patch does not match exactly.
  --no-backup-if-mismatch  Back up mismatches only if otherwise requested.

  -V STYLE  --version-control=STYLE  Use STYLE version control.
	STYLE is either 'simple', 'numbered', or 'existing'.
  -B PREFIX  --prefix=PREFIX  Prepend PREFIX to backup file names.
  -Y PREFIX  --basename-prefix=PREFIX  Prepend PREFIX to backup file basenames.
  -z SUFFIX  --suffix=SUFFIX  Append SUFFIX to backup file names.

  -g NUM  --get=NUM  Get files from RCS etc. if positive; ask if negative.

Miscellaneous options:

  -t  --batch  Ask no questions; skip bad-Prereq patches; assume reversed.
  -f  --force  Like -t, but ignore bad-Prereq patches, and assume unreversed.
  -s  --quiet  --silent  Work silently unless an error occurs.
  --verbose  Output extra information about the work being done.
  --dry-run  Do not actually change any files; just print what would happen.
  --posix  Conform to the POSIX standard.

  -d DIR  --directory=DIR  Change the working directory to DIR first.
  --reject-format=FORMAT  Create 'context' or 'unified' rejects.
  --binary  Read and write data in binary mode.
  --read-only=BEHAVIOR  How to handle read-only input files: 'ignore' that they
                        are read-only, 'warn' (default), or 'fail'.
  -x NUM  --debug=NUM  Set internal debugging flags.

  -v  --version  Output version info.
  --help  Output this help.

Report bugs to <bug-patch@gnu.org>.

patch 常用参数说明:

patch -pNUM -i <patchfile>
  • -p Num 忽略几层文件夹,0001-abc.patch 示例:

    --- a/xxx/origin.txt
    +++ b/xxx/origin.txt
    
    • -p0 表示在当前目录找 xxx/origin.txt 文件
    • -p1 表示忽略 xxx 目录,在当前目录找 origin.txt 文件
  • -E 如果发现了空文件就删除它

  • -R 回滚打过的补丁

使用示例

# 原始文件 origin.txt,新文件 new.txt
$ cat origin.txt
hello line 1
this is origin file
hello line 2
$ cat new.txt
hello line 1
this is new file
hello line 2

# 制作patch文件
$ diff origin.txt new.txt >> mock.patch
$ cat mock.patch
2c2
< this is origin file
---
> this is new file

# 在 origin.txt 中应用 mock.patch,等同于 patch -p0 origin.txt -i mock.patch
$ patch -p0 origin.txt < mock.patch
patching file origin.txt

# 打 patch 后 origin.txt 内容
$ cat origin.txt
hello line 1
this is new file
hello line 2

# 回滚 mock.patch
$ patch -p0 -R origin.txt < mock.patch
patching file origin.txt

# 回滚后 origin.txt 内容
$ cat origin.txt
hello line 1
this is origin file
hello line 2

注意:若生成 *.rej 文件,表示 patch 应用失败。

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