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Rewording and clarifications

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Alex Hirsch 2020-09-29 14:20:22 +02:00
parent da96a314c0
commit e95dfc04bf
2 changed files with 20 additions and 15 deletions
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assignment1/README.md
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@ -8,7 +8,7 @@ For this assignment you are *not* allowed to work in teams.
You are *not* allowed to use code from other people participating in this course. You are *not* allowed to use code from other people participating in this course.
Always state the origin of non-original code and ideas. Always state the origin of non-original code and ideas.
It is recommend to be familiar Git to understand the intensions behind the following commands. It is recommend to be familiar with Git to understand the intensions behind the following commands.
## `lit` ## `lit`
@ -41,10 +41,10 @@ Keep the output concise, similar to `git status --short`.
Creates a new commit containing *all* changes. Creates a new commit containing *all* changes.
In contrast to Git, there is no staging area. In contrast to Git, there is no staging area.
A commit is comprised of a unique identifier, the identifier of the previous commit, a timestamp, a message, and the recorded changes. A commit is comprised of a unique identifier, the identifier of the parent commit(s), a timestamp, a message, and the recorded changes.
The message is provided to the `commit` sub-command as additional argument. The message is provided to the `commit` sub-command as additional argument.
As unique identifier use a counter (starting from 0) and prefix the value with `r` (for revision). Use a counter (starting from 0) prefixed with `r` (for revision) as unique identifier.
``` ```
$ lit commit 'Add coin operated self-destruct feature' $ lit commit 'Add coin operated self-destruct feature'
@ -60,6 +60,7 @@ If no commit is specified, display the currently checked out one.
``` ```
$ lit show r42 $ lit show r42
Commit: r42 Commit: r42
Parents: r41
Date: Mon Sep 28 23:27:53 CEST 2020 Date: Mon Sep 28 23:27:53 CEST 2020
Add coin operated self-destruct feature Add coin operated self-destruct feature
@ -108,22 +109,22 @@ If a file has been modified in both branches, the whole file is treated as a con
If a conflict is encountered, stop the merge process and provide the respective files of the other branch as well as the common base. If a conflict is encountered, stop the merge process and provide the respective files of the other branch as well as the common base.
``` ```
$ lit merge r1 $ lit merge r21
Merge conflict(s) detected: Merge conflict(s) detected:
- robot.c - robot.c
$ ls $ ls
robot.c # currently checked out version. robot.c # currently checked out version.
robot.c.r1 # version of the other branch robot.c.r21 # version of the other branch
robot.c.r0 # common base of both branches robot.c.r18 # common base of both branches
$ # Manually resolving the merge conflict: $ # Manually resolving the merge conflict:
$ vimdiff robot.c robot.c.r1 robot.c.r0 $ vimdiff robot.c robot.c.r21 robot.c.r18
$ # Cleanup $ # Cleanup
$ rm robot.c.r1 robot.c.r0 $ rm robot.c.r21 robot.c.r18
$ lit commit $ lit commit 'Merge r21 into r20'
``` ```
To complete the merge after manually resolving a conflict, invoke the `commit` sub-command. To complete the merge after manually resolving a conflict, invoke the `commit` sub-command.
@ -151,22 +152,26 @@ If you encounter a problem where the specification is ambiguous or unclear, make
You are only allowed to use: You are only allowed to use:
- C++ standard library (C++17 standard) - C++ standard library (C++17 standard)
- C standard library (as fallback) - C standard library (as fallback)
- POSIX standard library - POSIX standard library (as fallback)
- `diff` / `patch` command - `diff` / `patch` command
You must use CMake as build system. You must use CMake as build system.
Use [ClangFormat](https://clang.llvm.org/docs/ClangFormat.html) to automatically format your code using the provided `.clang-format` configuration. Use [ClangFormat](https://clang.llvm.org/docs/ClangFormat.html) to automatically format your code using the provided [`.clang-format`](../.clang-format) configuration.
There is probably a plugin for your text editor / IDE to automate this process. There is probably a plugin for your text editor / IDE to automate this process.
Your VCS must store the differences (as reported by `diff -u`). Your VCS must store the differences (as reported by `diff -u`).
Storing a full copy of the repository's files for each commit is not allowed. Storing a full copy of the repository's files for each commit is not allowed.
You don't need to track empty folders, yet files located in sub-directories. You don't need to track empty folders, yet files located within folders.
You may treat empty files as being deleted.
You may assume that `lit` is always executed from the root of a repository.
You may assume that only one instance of your VCS operators on a repository at any point in time. You may assume that only one instance of your VCS operators on a repository at any point in time.
Hence, you don't need to add some form of locking mechanism to prevent concurrent access. Hence, you don't need to add some form of locking mechanism to prevent concurrent access.
The executable does not depend on any additional resources (except for `diff` and `patch`). The executable does not depend on any additional resources (except for standard libraries, `diff` and `patch`).
You may assume that `diff` and `patch` are present and available via `PATH`. You may assume that `diff` and `patch` are present and available via `PATH`.
**Hint:** It may be a good idea to create a dedicated class for invoking shell commands like `diff` and `patch`. **Hint:** It may be a good idea to create a dedicated class for invoking shell commands like `diff` and `patch`.
@ -179,7 +184,7 @@ Along with this specification a rudimentary test script [`lit-test`](lit-test) i
It assumes that the `lit` executable is in your path. It assumes that the `lit` executable is in your path.
Remember that you can use `bash -x` to debug the test script. Remember that you can use `bash -x` to debug the test script.
You are encouraged to setup some more test cases for your implementation. You are encouraged to set up some more test cases for your implementation.
## Evaluation (9 points) ## Evaluation (9 points)

2
assignment1/lit-test
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@ -171,7 +171,7 @@ echo >>file1 "Sixth line added during merge conflict."
# Before continuing we need to cleanup the leftover files. # Before continuing we need to cleanup the leftover files.
rm file1.r6 file1.r3 rm file1.r6 file1.r3
lit commit # r7 lit commit "Merge r6 into r5" # r7
# Let's verify the final result. # Let's verify the final result.