echo $(Build.SourceVersion)
set TestVar=$(Build.SourceVersion)
set MyCustomVar=%TestVar:~0,7%
echo %MyCustomVar%
echo ##vso[task.setvariable variable=ShortSourceVersion]%MyCustomVar%
In this case, we could get the short versions of Build.SourceVersion and set it as environment variable.
Then we could set this command line task as a task group:
So, we could use this task to set the ShortSourceVersion directly.
Hope this helps.
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Sure you can! If you absolutely must. Here is a runtime computation taking the first 7 characters of the Build.SourceVersion variable.
variables:
example: ${{ format('{0}{1}{2}{3}{4}{5}{6}', variables['Build.SourceVersion'][0], variables['Build.SourceVersion'][1], variables['Build.SourceVersion'][2], variables['Build.SourceVersion'][3], variables['Build.SourceVersion'][4], variables['Build.SourceVersion'][5], variables['Build.SourceVersion'][6]) }}
NB: I can't get it to work with $[...] syntax as the variable is apparently empty at the initial.
I know I'm a bit late to this party, but for anyone who comes by here and wants to avoid using Bash, PowerShell and similar, I've managed to do a substring with nothing but Azure Pipelines expressions.
(I'll definitely go straight to hell for writing this code)
Unfortunately, we can not index on string for some reason, so @dsschneidermann's answer does not work. But we can work around this using the split function.
This definitely is more complex than using scripting, but is, on the other hand, run fully at the compile time.
Append some known character after each and every character in the original string using replace. I.e., append _, so that abc becomes a_b_c_.
Split the string using the appended character - split('a_b_c_', '_'). The split function returns an indexable array.
Use indexing on the array to compose the result
This, besides being unreadable, has the disadvantage that you have to specify all characters that might ever be part of the input value. Failing to do so might cause unexpected behavior. But for a git hash, it's enough to specify the whole alphabet, plus numerics.
The result is this:
- name: Build.SourceVersion.PreparedForSplit
value: ${{ replace(replace(replace(replace(replace(replace(replace(replace(replace(replace(replace(replace(replace(replace(replace(replace(replace(replace(replace(replace(replace(replace(replace(replace(replace(replace(replace(replace(replace(replace(replace(replace(replace(replace(replace(replace(variables['Build.SourceVersion'], 'a', 'a_'), 'b', 'b_'), 'c', 'c_'), 'd', 'd_'), 'e', 'e_'), 'f', 'f_'), 'g', 'g_'), 'h', 'h_'), 'i', 'i_'), 'j', 'j_'), 'k', 'k_'), 'l', 'l_'), 'm', 'm_'), 'n', 'n_'), 'o', 'o_'), 'p', 'p_'), 'q', 'q_'), 'r', 'r_'), 's', 's_'), 't', 't_'), 'u', 'u_'), 'v', 'v_'), 'w', 'w_'), 'x', 'x_'), 'y', 'y_'), 'z', 'z_'), '0', '0_'), '1', '1_'), '2', '2_'), '3', '3_'), '4', '4_'), '5', '5_'), '6', '6_'), '7', '7_'), '8', '8_'), '9', '9_') }}
readonly: true
- name: Build.SourceVersion.Short
value: ${{ split(variables['Build.SourceVersion.PreparedForSplit'], '_')[0] }}${{ split(variables['Build.SourceVersion.PreparedForSplit'], '_')[1] }}${{ split(variables['Build.SourceVersion.PreparedForSplit'], '_')[2] }}${{ split(variables['Build.SourceVersion.PreparedForSplit'], '_')[3] }}${{ split(variables['Build.SourceVersion.PreparedForSplit'], '_')[4] }}${{ split(variables['Build.SourceVersion.PreparedForSplit'], '_')[5] }}${{ split(variables['Build.SourceVersion.PreparedForSplit'], '_')[6] }}
readonly: true
You might put these in a variable template and then, everywhere you need to use them, just include this template, what is a one line of code. So you end up with one hard-to-read code file, but other simple ones, and everything is processed at the template's compile time.
I've also created a PowerShell script for generating the intermediate variable:
# Input variable name
$VariableName = 'Build.SourceVersion'
# Known characters - should be every character that could appear in the input
$Chars = 'abcdefghijklmnopqrstuvwxyz0123456789'
# Character to be appended after every character in the input string
$IntermediateChar = '_'
$output = "variables['$VariableName']"
foreach ($Char in [char[]]$Chars) {
$output = "replace($output, '$Char', '$Char$IntermediateChar')"
Write-Host $output
You are right, there is no native way to do it. You will have to write a script to transform the variable.
Here is an example:
trigger:
- master
resources:
- repo: self
stages:
- stage: Build
displayName: Build image
jobs:
- job: Build
displayName: Build
pool:
vmImage: 'ubuntu-latest'
steps:
- task: CmdLine@2
inputs:
script: ' x=`echo "$(Build.SourceVersion)" | head -c 7`; echo "##vso[task.setvariable variable=MyVar]$x"'
- task: CmdLine@2
inputs:
script: 'echo "$(MyVar)"'
Here is the shortest version that I use for this job;
- bash: |
longcommithash=$(Build.SourceVersion)
echo "##vso[task.setvariable variable=shorthash;]$(echo ${longcommithash::9})"
It gives you the output as shown below;
On Azure devops it's possible to be done using batch technique indeed - like other answers propose in here - however I wanted to remove string from the end of string - and with batch this gets more complex ( See following link ).
Then I've concluded to use Azure's built-in expressions, for example like this:
- name: sourceBranchName
value: ${{ replace(variables['Build.SourceBranch'], 'refs/heads/') }}
replace will have similar effect to substring - so it will remove unnecessary part from original string.
If however you want to concatenate some string and then remove it from original name - it's possible to be done using for instance format function:
- name: originBranchName
value: ${{ replace(variables.sourceBranchName, format('-to-{0}', variables.dynamicvar ) ) }}
If dynamicvar is a - then function will remove -to-a from branch name.
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