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git-patch-workflow

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Actualizado24 de abril de 2026 a las 05:14

Creating, managing, and applying unified diff patches with Git for source code modifications.

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Fuente

cxcscmu

cxcscmu/SkillLearnBench

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Ocupaciones relacionadasSOC

Basado en la clasificación ocupacional SOC

Desarrolladores de softwareOcupaciones informáticas y matemáticas·SOC 15-1252

SKILL.md

readonly

name	git-patch-workflow
description	Creating, managing, and applying unified diff patches with Git for source code modifications.

Git Patch Workflow

Creating Patch Files

Method 1: From Unstaged Changes

cd /path/to/repo
git diff path/to/file.java > /path/to/patch/fix.patch

Method 2: From Staged Changes

git diff --cached > /path/to/patch/fix.patch

Method 3: From Commits

# Create patch from last N commits
git format-patch -N HEAD

# Create patch from specific commit
git show COMMIT_HASH > /path/to/patch/fix.patch

Patch File Structure

A unified diff patch looks like:

--- a/original/path/file.java
+++ b/modified/path/file.java
@@ -10,5 +10,6 @@ class MyClass {
     // context line
-    old code here
+    new code here
     // context line

Key components:

--- prefix: original file
+++ prefix: modified file
@@ markers: line numbers and context
- prefix: removed lines
+ prefix: added lines
No prefix: context lines

Applying Patches

Basic Application

cd /path/to/repo
patch -p1 < /path/to/patch/fix.patch

With Error Handling

# Dry-run to test application
patch -p1 --dry-run < /path/to/patch/fix.patch

# Apply with strict checking
patch -p1 < /path/to/patch/fix.patch

# Apply with less strict checking
patch -p0 < /path/to/patch/fix.patch

Best Practices

Use Git Format: Create patches via git diff or git format-patch for consistency
Include Context: Ensure adequate context lines (3+ lines around changes)
Test Patches: Always dry-run before applying to ensure compatibility
Modular Patches: Create separate patches for logically independent changes
Clear Names: Name patches descriptively (e.g., fix-javascript-security-bypass.patch)
Document Changes: Include explanation of what the patch fixes

Verifying Application

# Check if patch was applied
git status
git diff HEAD

# Verify specific file was patched
git show HEAD:path/to/file.java | grep "your fix"

Multiple Patches

For multiple related patches:

# Create patches in order
git diff HEAD~2 HEAD~1 > patch1.patch
git diff HEAD~1 HEAD > patch2.patch

# Apply in sequence
patch -p1 < patch1.patch
patch -p1 < patch2.patch

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name	git-patch-workflow
description	Creating, managing, and applying unified diff patches with Git for source code modifications.

Git Patch Workflow

Creating Patch Files

Method 1: From Unstaged Changes

cd /path/to/repo
git diff path/to/file.java > /path/to/patch/fix.patch

Method 2: From Staged Changes

git diff --cached > /path/to/patch/fix.patch

Method 3: From Commits

# Create patch from last N commits
git format-patch -N HEAD

# Create patch from specific commit
git show COMMIT_HASH > /path/to/patch/fix.patch

Patch File Structure

A unified diff patch looks like:

--- a/original/path/file.java
+++ b/modified/path/file.java
@@ -10,5 +10,6 @@ class MyClass {
     // context line
-    old code here
+    new code here
     // context line

Key components:

--- prefix: original file
+++ prefix: modified file
@@ markers: line numbers and context
- prefix: removed lines
+ prefix: added lines
No prefix: context lines

Applying Patches

Basic Application

cd /path/to/repo
patch -p1 < /path/to/patch/fix.patch

With Error Handling

# Dry-run to test application
patch -p1 --dry-run < /path/to/patch/fix.patch

# Apply with strict checking
patch -p1 < /path/to/patch/fix.patch

# Apply with less strict checking
patch -p0 < /path/to/patch/fix.patch

Best Practices

Use Git Format: Create patches via git diff or git format-patch for consistency
Include Context: Ensure adequate context lines (3+ lines around changes)
Test Patches: Always dry-run before applying to ensure compatibility
Modular Patches: Create separate patches for logically independent changes
Clear Names: Name patches descriptively (e.g., fix-javascript-security-bypass.patch)
Document Changes: Include explanation of what the patch fixes

Verifying Application

# Check if patch was applied
git status
git diff HEAD

# Verify specific file was patched
git show HEAD:path/to/file.java | grep "your fix"

Multiple Patches

For multiple related patches:

# Create patches in order
git diff HEAD~2 HEAD~1 > patch1.patch
git diff HEAD~1 HEAD > patch2.patch

# Apply in sequence
patch -p1 < patch1.patch
patch -p1 < patch2.patch