8976500cbb
Both bash and zsh subject the value of PS1 to parameter expansion, command substitution, and arithmetic expansion. Rather than include the raw, unescaped branch name in PS1 when running in two- or three-argument mode, construct PS1 to reference a variable that holds the branch name. Because the shells do not recursively expand, this avoids arbitrary code execution by specially-crafted branch names such as '$(IFS=_;cmd=sudo_rm_-rf_/;$cmd)'. Signed-off-by: Richard Hansen <rhansen@bbn.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
485 lines
14 KiB
Bash
485 lines
14 KiB
Bash
# bash/zsh git prompt support
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#
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# Copyright (C) 2006,2007 Shawn O. Pearce <spearce@spearce.org>
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# Distributed under the GNU General Public License, version 2.0.
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#
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# This script allows you to see repository status in your prompt.
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#
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# To enable:
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#
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# 1) Copy this file to somewhere (e.g. ~/.git-prompt.sh).
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# 2) Add the following line to your .bashrc/.zshrc:
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# source ~/.git-prompt.sh
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# 3a) Change your PS1 to call __git_ps1 as
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# command-substitution:
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# Bash: PS1='[\u@\h \W$(__git_ps1 " (%s)")]\$ '
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# ZSH: setopt PROMPT_SUBST ; PS1='[%n@%m %c$(__git_ps1 " (%s)")]\$ '
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# the optional argument will be used as format string.
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# 3b) Alternatively, for a slightly faster prompt, __git_ps1 can
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# be used for PROMPT_COMMAND in Bash or for precmd() in Zsh
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# with two parameters, <pre> and <post>, which are strings
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# you would put in $PS1 before and after the status string
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# generated by the git-prompt machinery. e.g.
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# Bash: PROMPT_COMMAND='__git_ps1 "\u@\h:\w" "\\\$ "'
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# will show username, at-sign, host, colon, cwd, then
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# various status string, followed by dollar and SP, as
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# your prompt.
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# ZSH: precmd () { __git_ps1 "%n" ":%~$ " "|%s" }
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# will show username, pipe, then various status string,
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# followed by colon, cwd, dollar and SP, as your prompt.
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# Optionally, you can supply a third argument with a printf
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# format string to finetune the output of the branch status
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#
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# The repository status will be displayed only if you are currently in a
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# git repository. The %s token is the placeholder for the shown status.
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#
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# The prompt status always includes the current branch name.
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#
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# In addition, if you set GIT_PS1_SHOWDIRTYSTATE to a nonempty value,
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# unstaged (*) and staged (+) changes will be shown next to the branch
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# name. You can configure this per-repository with the
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# bash.showDirtyState variable, which defaults to true once
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# GIT_PS1_SHOWDIRTYSTATE is enabled.
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#
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# You can also see if currently something is stashed, by setting
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# GIT_PS1_SHOWSTASHSTATE to a nonempty value. If something is stashed,
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# then a '$' will be shown next to the branch name.
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#
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# If you would like to see if there're untracked files, then you can set
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# GIT_PS1_SHOWUNTRACKEDFILES to a nonempty value. If there're untracked
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# files, then a '%' will be shown next to the branch name. You can
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# configure this per-repository with the bash.showUntrackedFiles
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# variable, which defaults to true once GIT_PS1_SHOWUNTRACKEDFILES is
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# enabled.
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#
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# If you would like to see the difference between HEAD and its upstream,
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# set GIT_PS1_SHOWUPSTREAM="auto". A "<" indicates you are behind, ">"
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# indicates you are ahead, "<>" indicates you have diverged and "="
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# indicates that there is no difference. You can further control
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# behaviour by setting GIT_PS1_SHOWUPSTREAM to a space-separated list
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# of values:
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#
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# verbose show number of commits ahead/behind (+/-) upstream
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# name if verbose, then also show the upstream abbrev name
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# legacy don't use the '--count' option available in recent
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# versions of git-rev-list
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# git always compare HEAD to @{upstream}
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# svn always compare HEAD to your SVN upstream
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#
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# By default, __git_ps1 will compare HEAD to your SVN upstream if it can
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# find one, or @{upstream} otherwise. Once you have set
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# GIT_PS1_SHOWUPSTREAM, you can override it on a per-repository basis by
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# setting the bash.showUpstream config variable.
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#
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# If you would like to see more information about the identity of
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# commits checked out as a detached HEAD, set GIT_PS1_DESCRIBE_STYLE
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# to one of these values:
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#
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# contains relative to newer annotated tag (v1.6.3.2~35)
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# branch relative to newer tag or branch (master~4)
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# describe relative to older annotated tag (v1.6.3.1-13-gdd42c2f)
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# default exactly matching tag
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#
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# If you would like a colored hint about the current dirty state, set
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# GIT_PS1_SHOWCOLORHINTS to a nonempty value. The colors are based on
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# the colored output of "git status -sb" and are available only when
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# using __git_ps1 for PROMPT_COMMAND or precmd.
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# check whether printf supports -v
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__git_printf_supports_v=
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printf -v __git_printf_supports_v -- '%s' yes >/dev/null 2>&1
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# stores the divergence from upstream in $p
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# used by GIT_PS1_SHOWUPSTREAM
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__git_ps1_show_upstream ()
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{
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local key value
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local svn_remote svn_url_pattern count n
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local upstream=git legacy="" verbose="" name=""
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svn_remote=()
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# get some config options from git-config
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local output="$(git config -z --get-regexp '^(svn-remote\..*\.url|bash\.showupstream)$' 2>/dev/null | tr '\0\n' '\n ')"
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while read -r key value; do
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case "$key" in
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bash.showupstream)
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GIT_PS1_SHOWUPSTREAM="$value"
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if [[ -z "${GIT_PS1_SHOWUPSTREAM}" ]]; then
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p=""
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return
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fi
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;;
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svn-remote.*.url)
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svn_remote[$((${#svn_remote[@]} + 1))]="$value"
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svn_url_pattern="$svn_url_pattern\\|$value"
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upstream=svn+git # default upstream is SVN if available, else git
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;;
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esac
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done <<< "$output"
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# parse configuration values
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for option in ${GIT_PS1_SHOWUPSTREAM}; do
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case "$option" in
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git|svn) upstream="$option" ;;
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verbose) verbose=1 ;;
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legacy) legacy=1 ;;
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name) name=1 ;;
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esac
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done
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# Find our upstream
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case "$upstream" in
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git) upstream="@{upstream}" ;;
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svn*)
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# get the upstream from the "git-svn-id: ..." in a commit message
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# (git-svn uses essentially the same procedure internally)
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local -a svn_upstream
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svn_upstream=($(git log --first-parent -1 \
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--grep="^git-svn-id: \(${svn_url_pattern#??}\)" 2>/dev/null))
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if [[ 0 -ne ${#svn_upstream[@]} ]]; then
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svn_upstream=${svn_upstream[${#svn_upstream[@]} - 2]}
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svn_upstream=${svn_upstream%@*}
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local n_stop="${#svn_remote[@]}"
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for ((n=1; n <= n_stop; n++)); do
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svn_upstream=${svn_upstream#${svn_remote[$n]}}
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done
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if [[ -z "$svn_upstream" ]]; then
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# default branch name for checkouts with no layout:
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upstream=${GIT_SVN_ID:-git-svn}
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else
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upstream=${svn_upstream#/}
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fi
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elif [[ "svn+git" = "$upstream" ]]; then
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upstream="@{upstream}"
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fi
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;;
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esac
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# Find how many commits we are ahead/behind our upstream
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if [[ -z "$legacy" ]]; then
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count="$(git rev-list --count --left-right \
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"$upstream"...HEAD 2>/dev/null)"
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else
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# produce equivalent output to --count for older versions of git
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local commits
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if commits="$(git rev-list --left-right "$upstream"...HEAD 2>/dev/null)"
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then
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local commit behind=0 ahead=0
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for commit in $commits
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do
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case "$commit" in
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"<"*) ((behind++)) ;;
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*) ((ahead++)) ;;
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esac
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done
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count="$behind $ahead"
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else
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count=""
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fi
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fi
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# calculate the result
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if [[ -z "$verbose" ]]; then
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case "$count" in
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"") # no upstream
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p="" ;;
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"0 0") # equal to upstream
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p="=" ;;
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"0 "*) # ahead of upstream
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p=">" ;;
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*" 0") # behind upstream
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p="<" ;;
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*) # diverged from upstream
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p="<>" ;;
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esac
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else
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case "$count" in
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"") # no upstream
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p="" ;;
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"0 0") # equal to upstream
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p=" u=" ;;
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"0 "*) # ahead of upstream
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p=" u+${count#0 }" ;;
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*" 0") # behind upstream
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p=" u-${count% 0}" ;;
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*) # diverged from upstream
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p=" u+${count#* }-${count% *}" ;;
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esac
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if [[ -n "$count" && -n "$name" ]]; then
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__git_ps1_upstream_name=$(git rev-parse \
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--abbrev-ref "$upstream" 2>/dev/null)
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if [ $pcmode = yes ]; then
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# see the comments around the
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# __git_ps1_branch_name variable below
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p="$p \${__git_ps1_upstream_name}"
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else
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p="$p ${__git_ps1_upstream_name}"
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# not needed anymore; keep user's
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# environment clean
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unset __git_ps1_upstream_name
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fi
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fi
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fi
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}
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# Helper function that is meant to be called from __git_ps1. It
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# injects color codes into the appropriate gitstring variables used
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# to build a gitstring.
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__git_ps1_colorize_gitstring ()
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{
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if [[ -n ${ZSH_VERSION-} ]]; then
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local c_red='%F{red}'
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local c_green='%F{green}'
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local c_lblue='%F{blue}'
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local c_clear='%f'
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else
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# Using \[ and \] around colors is necessary to prevent
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# issues with command line editing/browsing/completion!
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local c_red='\[\e[31m\]'
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local c_green='\[\e[32m\]'
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local c_lblue='\[\e[1;34m\]'
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local c_clear='\[\e[0m\]'
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fi
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local bad_color=$c_red
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local ok_color=$c_green
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local flags_color="$c_lblue"
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local branch_color=""
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if [ $detached = no ]; then
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branch_color="$ok_color"
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else
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branch_color="$bad_color"
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fi
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c="$branch_color$c"
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z="$c_clear$z"
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if [ "$w" = "*" ]; then
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w="$bad_color$w"
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fi
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if [ -n "$i" ]; then
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i="$ok_color$i"
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fi
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if [ -n "$s" ]; then
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s="$flags_color$s"
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fi
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if [ -n "$u" ]; then
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u="$bad_color$u"
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fi
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r="$c_clear$r"
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}
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# __git_ps1 accepts 0 or 1 arguments (i.e., format string)
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# when called from PS1 using command substitution
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# in this mode it prints text to add to bash PS1 prompt (includes branch name)
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#
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# __git_ps1 requires 2 or 3 arguments when called from PROMPT_COMMAND (pc)
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# in that case it _sets_ PS1. The arguments are parts of a PS1 string.
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# when two arguments are given, the first is prepended and the second appended
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# to the state string when assigned to PS1.
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# The optional third parameter will be used as printf format string to further
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# customize the output of the git-status string.
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# In this mode you can request colored hints using GIT_PS1_SHOWCOLORHINTS=true
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__git_ps1 ()
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{
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local pcmode=no
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local detached=no
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local ps1pc_start='\u@\h:\w '
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local ps1pc_end='\$ '
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local printf_format=' (%s)'
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case "$#" in
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2|3) pcmode=yes
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ps1pc_start="$1"
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ps1pc_end="$2"
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printf_format="${3:-$printf_format}"
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;;
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0|1) printf_format="${1:-$printf_format}"
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;;
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*) return
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;;
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esac
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local repo_info rev_parse_exit_code
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repo_info="$(git rev-parse --git-dir --is-inside-git-dir \
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--is-bare-repository --is-inside-work-tree \
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--short HEAD 2>/dev/null)"
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rev_parse_exit_code="$?"
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if [ -z "$repo_info" ]; then
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if [ $pcmode = yes ]; then
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#In PC mode PS1 always needs to be set
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PS1="$ps1pc_start$ps1pc_end"
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fi
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return
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fi
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local short_sha
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if [ "$rev_parse_exit_code" = "0" ]; then
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short_sha="${repo_info##*$'\n'}"
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repo_info="${repo_info%$'\n'*}"
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fi
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local inside_worktree="${repo_info##*$'\n'}"
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repo_info="${repo_info%$'\n'*}"
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local bare_repo="${repo_info##*$'\n'}"
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repo_info="${repo_info%$'\n'*}"
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local inside_gitdir="${repo_info##*$'\n'}"
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local g="${repo_info%$'\n'*}"
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local r=""
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local b=""
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local step=""
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local total=""
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if [ -d "$g/rebase-merge" ]; then
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read b 2>/dev/null <"$g/rebase-merge/head-name"
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read step 2>/dev/null <"$g/rebase-merge/msgnum"
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read total 2>/dev/null <"$g/rebase-merge/end"
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if [ -f "$g/rebase-merge/interactive" ]; then
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r="|REBASE-i"
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else
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r="|REBASE-m"
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fi
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else
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if [ -d "$g/rebase-apply" ]; then
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read step 2>/dev/null <"$g/rebase-apply/next"
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read total 2>/dev/null <"$g/rebase-apply/last"
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if [ -f "$g/rebase-apply/rebasing" ]; then
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read b 2>/dev/null <"$g/rebase-apply/head-name"
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r="|REBASE"
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elif [ -f "$g/rebase-apply/applying" ]; then
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r="|AM"
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else
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r="|AM/REBASE"
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fi
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elif [ -f "$g/MERGE_HEAD" ]; then
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r="|MERGING"
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elif [ -f "$g/CHERRY_PICK_HEAD" ]; then
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r="|CHERRY-PICKING"
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elif [ -f "$g/REVERT_HEAD" ]; then
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r="|REVERTING"
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elif [ -f "$g/BISECT_LOG" ]; then
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r="|BISECTING"
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fi
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if [ -n "$b" ]; then
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:
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elif [ -h "$g/HEAD" ]; then
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# symlink symbolic ref
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b="$(git symbolic-ref HEAD 2>/dev/null)"
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else
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local head=""
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if ! read head 2>/dev/null <"$g/HEAD"; then
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if [ $pcmode = yes ]; then
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PS1="$ps1pc_start$ps1pc_end"
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fi
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return
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fi
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# is it a symbolic ref?
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b="${head#ref: }"
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if [ "$head" = "$b" ]; then
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detached=yes
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b="$(
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case "${GIT_PS1_DESCRIBE_STYLE-}" in
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(contains)
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git describe --contains HEAD ;;
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(branch)
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git describe --contains --all HEAD ;;
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(describe)
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git describe HEAD ;;
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(* | default)
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git describe --tags --exact-match HEAD ;;
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esac 2>/dev/null)" ||
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b="$short_sha..."
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b="($b)"
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fi
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fi
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fi
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if [ -n "$step" ] && [ -n "$total" ]; then
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r="$r $step/$total"
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fi
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local w=""
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local i=""
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local s=""
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local u=""
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local c=""
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local p=""
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if [ "true" = "$inside_gitdir" ]; then
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if [ "true" = "$bare_repo" ]; then
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c="BARE:"
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else
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b="GIT_DIR!"
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fi
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elif [ "true" = "$inside_worktree" ]; then
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if [ -n "${GIT_PS1_SHOWDIRTYSTATE-}" ] &&
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[ "$(git config --bool bash.showDirtyState)" != "false" ]
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then
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git diff --no-ext-diff --quiet --exit-code || w="*"
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if [ -n "$short_sha" ]; then
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git diff-index --cached --quiet HEAD -- || i="+"
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else
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i="#"
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fi
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fi
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if [ -n "${GIT_PS1_SHOWSTASHSTATE-}" ] &&
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[ -r "$g/refs/stash" ]; then
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s="$"
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fi
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if [ -n "${GIT_PS1_SHOWUNTRACKEDFILES-}" ] &&
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[ "$(git config --bool bash.showUntrackedFiles)" != "false" ] &&
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git ls-files --others --exclude-standard --error-unmatch -- '*' >/dev/null 2>/dev/null
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then
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u="%${ZSH_VERSION+%}"
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fi
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if [ -n "${GIT_PS1_SHOWUPSTREAM-}" ]; then
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__git_ps1_show_upstream
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fi
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fi
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local z="${GIT_PS1_STATESEPARATOR-" "}"
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# NO color option unless in PROMPT_COMMAND mode
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if [ $pcmode = yes ] && [ -n "${GIT_PS1_SHOWCOLORHINTS-}" ]; then
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__git_ps1_colorize_gitstring
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fi
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b=${b##refs/heads/}
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if [ $pcmode = yes ]; then
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# In pcmode (and only pcmode) the contents of
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# $gitstring are subject to expansion by the shell.
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# Avoid putting the raw ref name in the prompt to
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# protect the user from arbitrary code execution via
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# specially crafted ref names (e.g., a ref named
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# '$(IFS=_;cmd=sudo_rm_-rf_/;$cmd)' would execute
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# 'sudo rm -rf /' when the prompt is drawn). Instead,
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# put the ref name in a new global variable (in the
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# __git_ps1_* namespace to avoid colliding with the
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# user's environment) and reference that variable from
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# PS1.
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__git_ps1_branch_name=$b
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# note that the $ is escaped -- the variable will be
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# expanded later (when it's time to draw the prompt)
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b="\${__git_ps1_branch_name}"
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fi
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local f="$w$i$s$u"
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local gitstring="$c$b${f:+$z$f}$r$p"
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if [ $pcmode = yes ]; then
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|
if [ "${__git_printf_supports_v-}" != yes ]; then
|
|
gitstring=$(printf -- "$printf_format" "$gitstring")
|
|
else
|
|
printf -v gitstring -- "$printf_format" "$gitstring"
|
|
fi
|
|
PS1="$ps1pc_start$gitstring$ps1pc_end"
|
|
else
|
|
printf -- "$printf_format" "$gitstring"
|
|
fi
|
|
}
|