linux - bash 如何知道从/usr/lib/git-core/读取自动补全

Question

我安装了 git-flow，它将一些 bash 脚本复制到 /usr/lib/git-core/，现在可以在 bash complete 中使用。 我知道 bash 会读取以下目录以查找自动完成脚本:

• /etc/bash_completion.d/
• /usr/share/bash-completion/

是什么让 bash 知道这些新脚本？ 我从 debian 存储库安装了 git-flow，我试图了解是什么让这个包运行起来。

我没有成功找到 bash 确定它需要读取此目录的位置。查看 /usr/share/bash-completion/completions/git 也无济于事。

更新

环顾四周，似乎/usr/git-core/git 和/usr/bin/git 是同一个二进制文件:

~ $ file /usr/bin/git
/usr/bin/git: ELF 64-bit LSB  executable, x86-64, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.24, BuildID[sha1]=4f634dadca99fb29ed72568d5604df087d6e6502, stripped
~ $ file /usr/lib/git-core/git
/usr/lib/git-core/git: ELF 64-bit LSB  executable, x86-64, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.24, BuildID[sha1]=4f634dadca99fb29ed72568d5604df087d6e6502, stripped

Answer 1

OK，在Etan的提示下，貌似是bash补全，其实是git补全。至于为什么 /usr/lib/git-core 是搜索，strace 显示它在配置和构建包时是硬编码的:

execve("/usr/bin/git", ["git", "help", "-a"], [/* 73 vars */]) = 0
brk(0)                                  = 0xab4000
...
openat(AT_FDCWD, "/usr/lib/git-core", O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC) = 3
getdents(3, /* 169 entries */, 32768)   = 6192
stat("/usr/lib/git-core/git-fetch-pack", {st_mode=S_IFREG|0755, st_size=1577256, ...}) = 0
stat("/usr/lib/git-core/git-web--browse", {st_mode=S_IFREG|0755, st_size=4398, ...}) = 0
stat("/usr/lib/git-core/git-upload-archive", {st_mode=S_IFREG|0755, st_size=1577256, ...}) = 0
stat("/usr/lib/git-core/git-credential-store", {st_mode=S_IFREG|0755, st_size=765192, ...}) = 0
...

当使用 configure --prefix=/usr/local/bin/git 从源代码编译包时，strace 日志是:

execve("/usr/local/git/bin/git", ["/usr/local/git/bin/git", "help", "-a"], [/* 73 vars */]) = 0
brk(0)                                  = 0x2395000
...
openat(AT_FDCWD, "/usr/local/git/libexec/git-core", O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC) = 3
getdents(3, /* 159 entries */, 32768)   = 5792
stat("/usr/local/git/libexec/git-core/git-fetch-pack", {st_mode=S_IFREG|0755, st_size=8448439, ...}) = 0
stat("/usr/local/git/libexec/git-core/git-web--browse", {st_mode=S_IFREG|0755, st_size=4398, ...}) = 0
stat("/usr/local/git/libexec/git-core/git-upload-archive", {st_mode=S_IFREG|0755, st_size=8448439, ...}) = 0
stat("/usr/local/git/libexec/git-core/git-credential-store", {st_mode=S_IFREG|0755, st_size=4146627, ...}) = 0
stat("/usr/local/git/libexec/git-core/git-p4", {st_mode=S_IFREG|0755, st_size=122122, ...}) = 0
stat("/usr/local/git/libexec/git-core/git-merge-tree", {st_mode=S_IFREG|0755, st_size=8448439, ...}) = 0
stat("/usr/local/git/libexec/git-core/git-mergetool", {st_mode=S_IFREG|0755, st_size=8377, ...}) = 0