feat(unitproc):Add PI loop updater
[BK-2020-03.git] / unitproc / bktemp-initGitRepo
1 #!/bin/bash
2 # Desc: Initializes a git repository
3
4 #==BEGIN Define script parameters==
5 #===BEGIN Declare local script functions===
6 yell() { echo "$0: $*" >&2; } #o Yell, Die, Try Three-Fingered Claw technique
7 die() { yell "$*"; exit 111; } #o Ref/Attrib: https://stackoverflow.com/a/25515370
8 try() { "$@" || die "cannot $*"; } #o
9 checkURL() {
10 # Desc: Checks if string is a valid URL.
11 # Warning: Does not correctly handle multi-byte characters.
12 # Version: 0.0.2
13 # Input: arg1: string
14 # Output: return code 0: string is a valid URL
15 # return code 1: string is NOT a valid URL
16 # Depends: Bash 5.0.3
17 # Ref/Attrib: https://stackoverflow.com/a/3184819
18 regex='(https?|ftp|file|ssh|git)://[-A-Za-z0-9\+&@#/%?=~_|!:,.;]*[-A-Za-z0-9\+&@#/%=~_|]'
19 arg1="$1";
20 if [[ $arg1 =~ $regex ]]; then
21 return 0;
22 else
23 return 1;
24 fi;
25 } # Check if arg1 is valid URL
26 initGitRepo() {
27 # Desc: Creates, adds remotes to, and pulls to git repository
28 # Note: Does nothing if repoDir is already initialized git repo.
29 # Usage: createGitRepo arg1 arg2 arg3 arg4
30 # Input: arg1: repoURL
31 # arg2: repoDir
32 # arg3: remoteName
33 # arg4: branchName
34 # Version: 0.0.7
35 # Depends: checkURL() 0.0.2, yell(), Bash 5.0.3
36 # Ref/Attrib: [1]: Test for space-less alphanuemric string. https://unix.stackexchange.com/a/416120
37 # [2]: Test for argument count. https://stackoverflow.com/q/18568706
38 # [3]: Test if dir is (in) git repository. https://stackoverflow.com/a/39518382
39 # Note: Pulls use '--ff-only' option which requires an upstream branch be set.
40 # This can be done by using:
41 # $ git branch --set-upstream-to origin/master master
42 #
43 #==BEGIN Validate input arguments==
44 arg1="$1";
45 arg2="$2";
46 arg3="$3";
47 arg4="$4";
48 # Validate repoURL
49 if checkURL "$arg1"; then repoURL="$arg1";
50 else yell "ERROR:Not a valid URL:$arg1"; return 1; fi;
51
52 # Passthrough repoDir (it may not exist yet)
53 repoDir="$arg2";
54
55 # Validate remoteName
56 if [[ "$arg3" =~ ^[[:alnum:]]+$ ]]; then remoteName="$arg3";
57 else yell "ERROR:Not a valid remote name:$arg3"; return 1; fi; # See [1].
58
59 # Validate branchName
60 if [[ "$arg4" =~ ^[[:alnum:]]+$ ]]; then branchName="$arg4";
61 else yell "ERROR:Not a valid remote branch name:$arg4"; return 1; fi; # See [1].
62
63 # Check argument count
64 if [[ $# -gt 4 ]]; then yell "ERROR:Too many arguments."; return 1; fi; # See [2].
65 #==END Validate input arguments==
66 #==BEGIN create and populate git repository==
67 if [[ ! -d "$repoDir" ]]; then mkdir "$repoDir"; fi;
68 pushd "$repoDir" || return 1;
69 if ! git -C "$(pwd)" rev-parse 1>/dev/null 2>&1; then
70 yell "STATUS:Initializing as git repo:$repoDir";
71 git init; # Init repo if not already a git repo. See [3]
72 else
73 yell "STATUS:Already a git repository:$repoDir";
74 git status; git remote -v;
75 fi;
76 yell "STATUS:Adding $repoURL as remote $remoteName";
77 git remote add "$remoteName" "$repoURL";
78 yell "STATUS:Pulling branch $branchName from remote $remoteName";
79 git pull --ff-only "$remoteName" "$branchName";
80 unset repoURL repoDir remoteName branchName;
81 popd || exit 1;
82 #==END create and populate git repository==
83 yell "================================";
84 } # Init Git Repository
85 #===END Declare local script functions===
86 #==END Define script parameters==
87
88 #==BEGIN sample code
89 tmpDir=/tmp/"$(date +%Y%m%dT%H%M%S%z)";
90 mkdir -p "$tmpDir";
91 pushd "$tmpDir" || exit 1;
92
93 repoURL="https://zdv2.bktei.com/gitweb/baltakatei-exdev.git";
94 repoDir="BK-2020-03..bkexdev";
95 remoteName="zdv2";
96 branchName="master";
97 initGitRepo "$repoURL" "$repoDir" "$remoteName" "$branchName";
98 unset repoURL repoDir remoteName branchName;
99
100 yell "STATUS:Done.";
101 #==END sample code
102
103 # Author: Steven Baltaktei Sandoval
104 # License: GPLv3+